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  1. @RequestMapping(value = "/author/{id}", method = RequestMethod.GET)
  2. public ResponseEntity<?> getAuthor(@PathVariable("id") int id) {
  3.  
  4. if (authorService.findById(id) == null) {
  5. return new ResponseEntity(HttpStatus.NOT_FOUND);
  6. }
  7.  
  8. Author author = authorService.findById(id);
  9. return new ResponseEntity<Author>(author, HttpStatus.OK);
  10. }
  11.  
  12. public Author findById(int id) {
  13. return authorRepository.getOne(id);
  14. }
  15.  
  16. @Repository
  17. public interface AuthorRepository extends JpaRepository<Author,Integer> {
  18. }
  19.  
  20. @Entity(name = "authors")
  21. @JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
  22. public class Author {
  23.  
  24. @Id
  25. @GeneratedValue(strategy = GenerationType.AUTO)
  26. @NotFound(action = NotFoundAction.IGNORE)
  27. @NotNull
  28. @Column(name = "id")
  29. private Integer id;
  30.  
  31. @Column(name = "name")
  32. private String name;
  33.  
  34.  
  35.  
  36. {
  37. "timestamp": "2018-04-25T17:41:06.578+0000",
  38. "status": 500,
  39. "error": "Internal Server Error",
  40. "message": "Could not write JSON: Unable to find com.example.model.Author with id 5; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Unable to find com.example.model.Author with id 5 (through reference chain: com.example.model.Author_$$_jvst1b2_2["name"])",
  41. "path": "/author/5"
  42. }
  43.  
  44. javax.persistence.EntityNotFoundException: Unable to find com.example.model.Author with id 5
  45. at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$JpaEntityNotFoundDelegate.handleEntityNotFound(EntityManagerFactoryBuilderImpl.java:159) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
  46. at org.hibernate.proxy.AbstractLazyInitializer.checkTargetState(AbstractLazyInitializer.java:244) [hibernate-core-5.2.16.Final.jar:5.2.16.Final]
  47. at org.hibernate.proxy.AbstractLazyInitializer.permissiveInitialization(AbstractLazyInitializer.java:201) [hibernate-core-5.2.16.Final.jar:5.2.16.Final]
  48. at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:152) [hibernate-core-5.2.16.Final.jar:5.2.16.Final]
  49. at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:268) [hibernate-core-5.2.16.Final.jar:5.2.16.Final]
  50. at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:73) [hibernate-core-5.2.16.Final.jar:5.2.16.Final]
  51. at com.example.model.Author_$$_jvst1b2_2.getName(Author_$$_jvst1b2_2.java) [classes/:na]
  52. at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131]
  53. at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_131]
  54. at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_131]
  55. at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_131]
  56. at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:688) [jackson-databind-2.9.5.jar:2.9.5]
  57. at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) [jackson-databind-2.9.5.jar:2.9.5]
  58. at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) [jackson-databind-2.9.5.jar:2.9.5]
  59. at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480) [jackson-databind-2.9.5.jar:2.9.5]
  60. at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319) [jackson-databind-2.9.5.jar:2.9.5]
  61. at com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1396) [jackson-databind-2.9.5.jar:2.9.5]
  62. at com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:913) [jackson-databind-2.9.5.jar:2.9.5]
  63. at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:286) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  64. at org.springframework.http.converter.AbstractGenericHttpMessageConverter.write(AbstractGenericHttpMessageConverter.java:102) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  65. at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:271) [spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  66. at org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:224) [spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  67. at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:82) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  68. at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:119) [spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  69. at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:877) [spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  70. at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:783) [spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  71. at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) [spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  72. at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) [spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  73. at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) [spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  74. at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974) [spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  75. at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866) [spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  76. at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) [tomcat-embed-core-8.5.29.jar:8.5.29]
  77. at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851) [spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  78. at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) [tomcat-embed-core-8.5.29.jar:8.5.29]
  79. at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-8.5.29.jar:8.5.29]
  80. at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.29.jar:8.5.29]
  81. at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-embed-websocket-8.5.29.jar:8.5.29]
  82. at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.29.jar:8.5.29]
  83. at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.29.jar:8.5.29]
  84. at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  85. at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  86. at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.29.jar:8.5.29]
  87. at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.29.jar:8.5.29]
  88. at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  89. at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  90. at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.29.jar:8.5.29]
  91. at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.29.jar:8.5.29]
  92. at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  93. at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  94. at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.29.jar:8.5.29]
  95. at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.29.jar:8.5.29]
  96. at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  97. at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE]
  98. at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.29.jar:8.5.29]
  99. at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.29.jar:8.5.29]
  100. at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) [tomcat-embed-core-8.5.29.jar:8.5.29]
  101. at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.29.jar:8.5.29]
  102. at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496) [tomcat-embed-core-8.5.29.jar:8.5.29]
  103. at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.29.jar:8.5.29]
  104. at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.29.jar:8.5.29]
  105. at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.29.jar:8.5.29]
  106. at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.29.jar:8.5.29]
  107. at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) [tomcat-embed-core-8.5.29.jar:8.5.29]
  108. at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.29.jar:8.5.29]
  109. at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790) [tomcat-embed-core-8.5.29.jar:8.5.29]
  110. at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459) [tomcat-embed-core-8.5.29.jar:8.5.29]
  111. at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.29.jar:8.5.29]
  112. at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_131]
  113. at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_131]
  114. at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.29.jar:8.5.29]
  115. at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]
  116.  
  117. public Optional<Author> findById(int id) {
  118. return authorRepository.findById(id);
  119. }
  120.  
  121. @RequestMapping(value = "/author/{id}", method = RequestMethod.GET)
  122. public ResponseEntity<?> getAuthor(@PathVariable("id") int id) {
  123.  
  124. Optinal<Author> author = authorService.findById(id);
  125. if (!author.isPresent()) {
  126. return new ResponseEntity(HttpStatus.NOT_FOUND);
  127. }
  128.  
  129. return new ResponseEntity<Author>(author.get(), HttpStatus.OK);
  130. }
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