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https://stackoverflow.com/questions/58267226/spring-boot-man

maifeeulasad
Oct 7th, 2019
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  1.  
  2. E:\gits\Assignment-Submission-System-Service\cse616>curl -X POST -H "Content-Type: application/json" -d "{ \"userID\":\"22\" }" http://localhost:8080/class
  3. {
  4. "timestamp" : "2019-10-07T09:48:21.300+0000",
  5. "status" : 500,
  6. "error" : "Internal Server Error",
  7. "message" : "No message available",
  8. "trace" : "java.lang.StackOverflowError\r\n\tat java.base/java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:748)\r\n\tat java.base/java.lang.StringBuilder.append(String
  9. Builder.java:241)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:470)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616
  10. .Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base
  11. /java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom
  12. .java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollec
  13. tion.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.la
  14. ng.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.ja
  15. va:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.
  16. java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base
  17. /java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.l
  18. ang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.ja
  19. va:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(
  20. StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.
  21. cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat jav
  22. a.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(Cla
  23. ssRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.Abstract
  24. Collection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/j
  25. ava.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollect
  26. ion.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(S
  27. tring.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat jav
  28. a.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/
  29. java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(Str
  30. ing.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.a
  31. ppend(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat co
  32. m.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\t
  33. at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toStri
  34. ng(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.Ab
  35. stractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.
  36. base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractC
  37. ollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.val
  38. ueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\t
  39. at java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java
  40. .base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.value
  41. Of(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBui
  42. lder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\
  43. tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)
  44. \r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.
  45. toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.u
  46. til.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat
  47. java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(Abs
  48. tractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.Stri
  49. ng.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)
  50. \r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\ta
  51. t java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String
  52. .valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.Str
  53. ingBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951
  54. )\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.jav
  55. a:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.Clas
  56. sRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/
  57. java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r
  58. \n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toStri
  59. ng(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lan
  60. g.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.jav
  61. a:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\
  62. r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.
  63. String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.la
  64. ng.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.jav
  65. a:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuild
  66. er.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Mode
  67. l.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java
  68. .base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java
  69. :18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.
  70. toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/ja
  71. va.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollecti
  72. on.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:
  73. 2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java
  74. .lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/j
  75. ava.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(Stri
  76. ng.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(Strin
  77. gBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse61
  78. 6.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\ta
  79. t java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(Use
  80. r.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractColle
  81. ction.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.b
  82. ase/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCo
  83. llection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String
  84. .java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.bas
  85. e/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.
  86. base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueO
  87. f(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append
  88. (StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua
  89. .cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\
  90. r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toStri
  91. ng(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.Abstrac
  92. tCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat
  93. java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(Abst
  94. ractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(
  95. String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat ja
  96. va.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat
  97. java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.
  98. valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.
  99. append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat c
  100. om.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java
  101. :168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.
  102. toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.A
  103. bstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\
  104. n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toStrin
  105. g(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.va
  106. lueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\
  107. tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r
  108. \n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.S
  109. tring.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBu
  110. ilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n
  111. \tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilde
  112. r.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model
  113. .User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.
  114. util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:
  115. 12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.t
  116. oString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.Str
  117. ing.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473
  118. )\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2
  119. 951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.
  120. lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.St
  121. ringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:295
  122. 1)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(String
  123. Builder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616
  124. .Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base
  125. /java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom
  126. .java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollec
  127. tion.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.la
  128. ng.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.ja
  129. va:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.
  130. java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base
  131. /java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.l
  132. ang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.ja
  133. va:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(
  134. StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.
  135. cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat jav
  136. a.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(Cla
  137. ssRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.Abstract
  138. Collection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/j
  139. ava.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollect
  140. ion.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(S
  141. tring.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat jav
  142. a.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/
  143. java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(Str
  144. ing.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.a
  145. ppend(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat co
  146. m.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\t
  147. at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toStri
  148. ng(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.Ab
  149. stractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.
  150. base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractC
  151. ollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.val
  152. ueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\t
  153. at java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java
  154. .base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.value
  155. Of(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBui
  156. lder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\
  157. tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)
  158. \r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.
  159. toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.u
  160. til.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat
  161. java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(Abs
  162. tractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.Stri
  163. ng.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)
  164. \r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\ta
  165. t java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String
  166. .valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.Str
  167. ingBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951
  168. )\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.jav
  169. a:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.Clas
  170. sRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/
  171. java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r
  172. \n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toStri
  173. ng(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lan
  174. g.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.jav
  175. a:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\
  176. r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.
  177. String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.la
  178. ng.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.jav
  179. a:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuild
  180. er.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Mode
  181. l.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java
  182. .base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java
  183. :18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.
  184. toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/ja
  185. va.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollecti
  186. on.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:
  187. 2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java
  188. .lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/j
  189. ava.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(Stri
  190. ng.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(Strin
  191. gBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse61
  192. 6.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\ta
  193. t java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(Use
  194. r.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractColle
  195. ction.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.b
  196. ase/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCo
  197. llection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String
  198. .java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.bas
  199. e/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.
  200. base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueO
  201. f(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append
  202. (StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua
  203. .cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\
  204. r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toStri
  205. ng(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.Abstrac
  206. tCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat
  207. java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(Abst
  208. ractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(
  209. String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat ja
  210. va.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat
  211. java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.
  212. valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.
  213. append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat c
  214. om.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java
  215. :168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.
  216. toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.A
  217. bstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\
  218. n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toStrin
  219. g(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.va
  220. lueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\
  221. tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r
  222. \n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.S
  223. tring.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBu
  224. ilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n
  225. \tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilde
  226. r.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model
  227. .User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.
  228. util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:
  229. 12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.t
  230. oString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.Str
  231. ing.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473
  232. )\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2
  233. 951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.
  234. lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.St
  235. ringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:295
  236. 1)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(String
  237. Builder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616
  238. .Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base
  239. /java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom
  240. .java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollec
  241. tion.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.la
  242. ng.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.ja
  243. va:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.
  244. java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base
  245. /java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.l
  246. ang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.ja
  247. va:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(
  248. StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.
  249. cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat jav
  250. a.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(Cla
  251. ssRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.Abstract
  252. Collection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/j
  253. ava.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollect
  254. ion.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(S
  255. tring.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat jav
  256. a.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/
  257. java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(Str
  258. ing.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.a
  259. ppend(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat co
  260. m.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\t
  261. at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toStri
  262. ng(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.Ab
  263. stractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.
  264. base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractC
  265. ollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.val
  266. ueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\t
  267. at java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java
  268. .base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.value
  269. Of(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBui
  270. lder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\
  271. tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)
  272. \r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.
  273. toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.u
  274. til.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat
  275. java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(Abs
  276. tractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.Stri
  277. ng.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)
  278. \r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\ta
  279. t java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String
  280. .valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.Str
  281. ingBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951
  282. )\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.jav
  283. a:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.Clas
  284. sRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/
  285. java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r
  286. \n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toStri
  287. ng(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lan
  288. g.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.jav
  289. a:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\
  290. r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.
  291. String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.la
  292. ng.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.jav
  293. a:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuild
  294. er.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Mode
  295. l.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java
  296. .base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java
  297. :18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.
  298. toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/ja
  299. va.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollecti
  300. on.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:
  301. 2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java
  302. .lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/j
  303. ava.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(Stri
  304. ng.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(Strin
  305. gBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse61
  306. 6.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\ta
  307. t java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(Use
  308. r.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractColle
  309. ction.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.b
  310. ase/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCo
  311. llection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String
  312. .java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.bas
  313. e/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.
  314. base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueO
  315. f(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append
  316. (StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua
  317. .cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\
  318. r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toStri
  319. ng(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.Abstrac
  320. tCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat
  321. java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(Abst
  322. ractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(
  323. String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat ja
  324. va.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat
  325. java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.
  326. valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.
  327. append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat c
  328. om.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java
  329. :168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.
  330. toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.A
  331. bstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\
  332. n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toStrin
  333. g(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.va
  334. lueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\
  335. tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r
  336. \n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.S
  337. tring.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBu
  338. ilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n
  339. \tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilde
  340. r.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model
  341. .User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.
  342. util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:
  343. 12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.t
  344. oString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.Str
  345. ing.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473
  346. )\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2
  347. 951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.
  348. lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.St
  349. ringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:295
  350. 1)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(String
  351. Builder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616
  352. .Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base
  353. /java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom
  354. .java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollec
  355. tion.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.la
  356. ng.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.ja
  357. va:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.
  358. java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base
  359. /java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.l
  360. ang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.ja
  361. va:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(
  362. StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.
  363. cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat jav
  364. a.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(Cla
  365. ssRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.Abstract
  366. Collection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/j
  367. ava.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollect
  368. ion.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(S
  369. tring.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat jav
  370. a.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/
  371. java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(Str
  372. ing.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.a
  373. ppend(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat co
  374. m.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\t
  375. at java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toStri
  376. ng(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.Ab
  377. stractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.
  378. base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractC
  379. ollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.val
  380. ueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\t
  381. at java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat com.mua.cse616.Model.User.toString(User.java:18)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java
  382. .base/java.lang.StringBuilder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.value
  383. Of(String.java:2951)\r\n\tat com.mua.cse616.Model.ClassRoom.toString(ClassRoom.java:12)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n\tat java.base/java.lang.StringBui
  384. lder.append(StringBuilder.java:168)\r\n\tat java.base/java.util.AbstractCollection.toString(AbstractCollection.java:473)\r\n\tat java.base/java.lang.String.valueOf(String.java:2951)\r\n"
  385. ,
  386. "path" : "/class"
  387. }
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