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  1. javax.servlet.ServletException: Communications link failure
  2. Connection conn=null;
  3. Class.forName("com.mysql.jdbc.Driver").newInstance();
  4. conn = DriverManager.getConnection("jdbc:mysql://localhost/TestDB?user=root&password=123");
  5.  
  6. if (conn != null) {
  7. out.println("connected");
  8. }
  9. else
  10. {
  11. out.println("connection failed");
  12. }
  13.  
  14. Stacktrace:
  15. org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:451)
  16. org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:355)
  17. org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
  18. org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
  19. javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
  20. sun.reflect.GeneratedMethodAccessor62.invoke(Unknown Source)
  21. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  22. java.lang.reflect.Method.invoke(Method.java:597)
  23. org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)
  24. java.security.AccessController.doPrivileged(Native Method)
  25. javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
  26. org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)
  27. org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162)
  28. java.security.AccessController.doPrivileged(Native Method)
  29. org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:738)
  30. sun.reflect.GeneratedMethodAccessor152.invoke(Unknown Source)
  31. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  32. java.lang.reflect.Method.invoke(Method.java:597)
  33. org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)
  34. java.security.AccessController.doPrivileged(Native Method)
  35. javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
  36. org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)
  37. org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:218)
  38.  
  39. root cause
  40.  
  41. javax.servlet.ServletException: Communications link failure
  42.  
  43. Last packet sent to the server was 0 ms ago.
  44. org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:841)
  45. org.apache.jasper.runtime.PageContextImpl.access$1100(PageContextImpl.java:64)
  46. org.apache.jasper.runtime.PageContextImpl$12.run(PageContextImpl.java:761)
  47. java.security.AccessController.doPrivileged(Native Method)
  48. org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:759)
  49. org.apache.jsp.test_jsp._jspService(test_jsp.java:71)
  50. org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
  51. javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
  52. org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
  53. org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
  54. org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
  55. javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
  56. sun.reflect.GeneratedMethodAccessor62.invoke(Unknown Source)
  57. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  58. java.lang.reflect.Method.invoke(Method.java:597)
  59. org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)
  60. java.security.AccessController.doPrivileged(Native Method)
  61. javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
  62. org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)
  63. org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162)
  64. java.security.AccessController.doPrivileged(Native Method)
  65. org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:738)
  66. sun.reflect.GeneratedMethodAccessor152.invoke(Unknown Source)
  67. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  68. java.lang.reflect.Method.invoke(Method.java:597)
  69. org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)
  70. java.security.AccessController.doPrivileged(Native Method)
  71. javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
  72. org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)
  73. org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:218)
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