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Spring数据休息一到很多级联

本文介绍了Spring数据休息一到很多级联的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有两个JPA实体User和Authority，User和Parent都是孩子。用户和权限之间有一对多的关系。



用户 - 

  @Data 
 @Entity 
 @Table（name =users，uniqueConstraints = {@UniqueConstraint（columnNames = {username}）}）
 public class User {
 
 @Id 
 @CustomEmailValidator 
 @ Size.List（{
 @Size（min = 5，message =该字段必须至少为{min}个字符），
 @Size（max = 100， message =该字段必须小于{max}个字符）
}）
私有字符串用户名; 
 
 @Basic 
 @Column（name =enabled，columnDefinition =BIT，length = 1）
 private boolean enabled; 
 
 @OneToMany（cascade = {CascadeType.ALL，CascadeType.PERSIST，CascadeType.MERGE}，mappedBy =user）
 @Column（nullable = false）
 private List< ;管理局> authority = new ArrayList<>（）; 
}

权限 - 

 @Entity 
 @Table（name =authorities）
 public class Authority {
 
 @Id 
 @GeneratedValue（strategy = GenerationType.AUTO）
私人长ID; 
 
 @版本
私人整数版本; 
 $ b $ @NotNull 
 @ Size.List（{
 @Size（min = 5，message =该字段必须至少包含{min}个字符），
 @Size（max = 100，message =该字段必须小于{max}个字符）
}）
私有字符串权限; 
 
 @ManyToOne（fetch = FetchType.EAGER）
 @JoinColumn（name =username，nullable = false）
 private用户用户; 
}

我将用户公开为Spring Data Rest存储库。当我做
时
我可以看到用于与权限一起列出。然而，当我尝试创建一个用户以及使用下面的json的权限 - 

  {
username： cmsdeveloper222@amnesty.org.in，
enabled：true，
authorities：[
 {
 
authority：ROLE_ADMIN
 
 
 
 $ b $ / code $ / pre> 
 
 
错误 -  
  {
原因：{
原因：{
原因：空，
消息：列'用户名'不能为空
}，
消息：无法执行语句
}，
message：无法执行语句; SQL [n / a]; constraint [null];嵌套异常是org.hibernate.exception.ConstraintViolationException：无法执行语句

  
潜在的例外是 -  
 造成者：com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException：列'用户名'不能为空
 at sun.reflect.NativeConstructorAccessorImpl.newInstance0（Native Method）〜[na：1.8.0_40] 
 at sun.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:62）〜 [na：1.8.0_40] 
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45）〜[na：1.8.0_40] 
 at java.lang.reflect.Constructor.newInstance（Constructor .java：422）〜[na：1.8.0_40] 
 at com.mysql.jdbc.Util.handleNewInstance（Util.java:377）〜[mysql-connector-java-5.1.34.jar：5.1。 34] 
 at com.mysql.jdbc.Util.getInstance（Util.java:360）〜[mysql-connector-java-5.1.34.jar：5.1.34] 
 at com.mysql。 jdbc.SQLError.createSQLException（SQLError.java:971）〜[mysql-connector-java-5.1.34.jar：5.1.34] 
 at com.mysql.jdbc.MysqlIO.checkErrorPacket（MysqlIO.java:3887 ）〜[mysql-connector-java-5.1.34.jar：5.1.34] 
 at com.mysql.jdbc.MysqlIO.checkErrorPacket（MysqlIO.java:3823）〜[mysql-connector-java-5.1 .34.jar：5.1.34] 
 at com.mysql.jdbc.MysqlIO.sendCommand（MysqlIO.java:2435）〜[mysql-connector-java-5.1.34.jar：5.1.34] 
 at com.mysql.jdbc.MysqlIO.sqlQueryDirect（MysqlIO.java:2582）〜[mysql-connector-java-5.1.34.jar：5.1.34] 
 at com.mysql.jdbc.ConnectionImpl。 execSQL（ConnectionImpl.java:2530）〜[mysql-connector-java-5.1.34.jar：5.1.34] 
 at com.mysql.jdbc.PreparedStatement.executeInternal（PreparedStatement.java:1907）〜[mysql -connector-java-5.1.34.jar：5.1.34] 
 at com.mysql.jdbc.PreparedStatement.executeUpdate（PreparedStatement.java:2141）〜[mysql-connector-java-5.1.34.jar： 5.1.34] 
 at com.mysql.jdbc.PreparedStatement.executeUpdate（PreparedStatement.java:2077）〜[mysql-connector-java-5.1.34.jar：5.1.34] 
 at com。 mysql.jdbc.PreparedStatement.executeUpdate（PreparedStatement.java:2062）〜[mysql-connector-java-5.1.34.jar：5.1.34] 
 at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate （ResultSetReturnImpl.java:208）〜[hibernate-co重新4.3.8.Final.jar：4.3.8.Final] 
 ... 151个常见框架省略
 Hibernate：从Campaign中选择count（campaign0_.id）作为col_0_0_ campaign0_ 
 Hibernate ：选择campaign0_.id为id1_0_，campaign0_.campaignId为campaign2_0_，campaign0_.emailOfTheCreator为emailOfT3_0_，campaign0_.endDate为endDate4_0_，campaign0_.name为name5_0_，campaign0_.startDate为startDat6_0_，campaign0_.status为status7_0_，campaign0_.summary为summary8_0_， campaign0_.version与Campaign campaign0_ limit中的版本9_0_一样吗？ 
 Hibernate：选择user0_.username为username1_3_1_，user0_.enabled为enabled2_3_1_，authoritie1_.username为username4_3_3_，authoritie1_.id为id1_2_3_，authoritie1_.id为id1_2_0_，authoritie1_.authority为authorit2_2_0_，authoritie1_.username为username4_2_0_，authoritie1_ .version version3_2_0_ from users user0_ left outer join authorities authoritie1_ on user0_.username = authoritie1_.username where user0_.username =？ 
 Hibernate：插入用户（启用，用户名）值（？，？）
 Hibernate：插入权限（权限，用户名，版本）值（？，？，？）
 16： 48：14.260 [http-nio-8080-exec-1]警告ohejdbc.spi.SqlExceptionHelper -SQL错误：1048，SQLState：23000 
 16：48：14.267 [http-nio-8080-exec-1]错误ohejdbc.spi.SqlExceptionHelper  - 列'username'不能为空
 16：48：14.271 [http-nio-8080-exec-1]警告ohejdbc.spi.SqlExceptionHelper  -  SQL警告代码：1048，SQLState ：23000 
 16：48：14.271 [http-nio-8080-exec-1] WARN ohejdbc.spi.SqlExceptionHelper  - 列'username'不能为空
 16：48：14.308 [http-nio -8080-exec-1]错误osdrwAbstractRepositoryRestController  - 无法执行语句; SQL [n / a];约束[null];嵌套异常是org.hibernate.exception.ConstraintViolationException：无法执行语句
 org.springframework.dao.DataIntegrityViolationException：无法执行语句; SQL [n / a];约束[null];嵌套异常是org.hibernate.exception.ConstraintViolationException：无法执行语句
在org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException（HibernateJpaDialect.java:248）〜[spring-orm-4.1.5。 RELEASE.jar：4.1.5.RELEASE] 
在org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible（HibernateJpaDialect.java:214）〜[spring-orm-4.1.5.RELEASE.jar：4.1 .5.RELEASE] 
 at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible（AbstractEntityManagerFactoryBean.java:417）〜[spring-orm-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
在org.springframework上的
 org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible（ChainedPersistenceExceptionTranslator.java:59）〜[spring-tx-4.1.5.RELEASE.jar：4.1.5.RELEASE] dao.support.DataAccessUtils.translateIfNecessary（DataAccessUtils.java:213）〜[spring-tx-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
在org.springframework.aop的org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke（PersistenceExceptionTranslationInterceptor.java:147）〜[spring-tx-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
。 framework.ReflectiveMethodInvocation.proceed（ReflectiveMethodInvocation.java:179）〜[spring-aop-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
 at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor $ CrudMethodMetadataPopulatingMethodIntercceptor.invoke（CrudMethodMetadataPostProcessor.java:122）〜[spring-data-jpa-1.7.2.RELEASE.jar：na] 
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed（ReflectiveMethodInvocation.java： 179）〜[spring-aop-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
在org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke（ExposeInvocationInterceptor.java:92）〜[spring-aop -4.1.5.RELEASE.jar：4.1.5.RELEASE] 
在org.springframework.aop.framework.ReflectiveMethodInvocation.proceed（Reflective MethodInvocation.java:179）〜[spring-aop-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
 at org.springframework.aop.framework.JdkDynamicAopProxy.invoke（JdkDynamicAopProxy.java:207）〜 [spring-aop-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
 at com.sun.proxy。$ Proxy98.save（Unknown Source）〜[na：na] 
 at org .springframework.data.rest.core.invoke.CrudRepositoryInvoker.invokeSave（CrudRepositoryInvoker.java:106）〜[spring-data-rest-core-2.2.2.RELEASE.jar：na] 
在org.springframework。 data.rest.webmvc.RepositoryEntityController.createAndReturn（RepositoryEntityController.java:414）〜[spring-data-rest-webmvc-2.2.2.RELEASE.jar：na] 
 at org.springframework.data.rest.webmvc .RepositoryEntityController.postCollectionResource（RepositoryEntityController.java:232）〜[spring-data-rest-webmvc-2.2.2.RELEASE.jar：na] 
 at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）〜[na ：1.8.0_40] 
 at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）〜[na：1.8.0_4 0] 
 at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）〜[na：1.8.0_40] 
 at java.lang.reflect.Method.invoke（Method.java:497） 〜[na：1.8.0_40] 
 at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke（InvocableHandlerMethod.java:221）〜[spring-web-4.1.5.RELEASE.jar：4.1.5 .RELEASE] 
在org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest（InvocableHandlerMethod.java:137）〜[spring-web-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
 at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle（ServletInvocableHandlerMethod.java:110）〜[spring-webmvc-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
在org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod（RequestMappingHandlerAdapter.java:777）〜[spring-webmvc-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
在org.springframework.web.servlet.mvc.method.annotation.Request MappingHandlerAdapter.handleInternal（RequestMappingHandlerAdapter.java:706）〜[spring-webmvc-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
 at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle （AbstractHandlerMethodAdapter.java:85）〜[spring-webmvc-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
 at org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:943） 〜[spring-webmvc-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
在org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:877）〜[spring-webmvc-4.1 .5.RELEASE.jar：4.1.5.RELEASE] 
在org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:966）[spring-webmvc-4.1.5.RELEASE.jar：4.1 .5.RELEASE] 
在org.springframework.web.servlet.FrameworkServlet.doPost（FrameworkServlet.java:868）[spring-webmvc-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
在javax.servlet.http.HttpServlet.service（HttpServlet.java:644）[tomcat-embed-core-8.0.20.jar：8 .0.20] 
 at org.springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:842）[spring-webmvc-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
 at javax.servlet.http.HttpServlet.service（HttpServlet.java:725）[tomcat-embed-core-8.0.20.jar：8.0.20] 
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ ApplicationFilterChain.java:291）[tomcat-embed-core-8.0.20.jar：8.0.20] 
 at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）[tomcat-embed -core-8.0.20.jar：8.0.20] 
在org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）[tomcat-embed-websocket-8.0.20.jar ：8.0.20] 
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:239）[tomcat-embed-core-8.0.20.jar：8.0.20] 
 at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）[tomcat-embed-core-8.0.20.jar：8.0.20] 
在org.springframework.web。 filter.HiddenHttpMethodFilter.doFilterInternal（HiddenHttpMethodFilter.java:77）[spring-web-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
 at org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter。 java：107）[spring-web-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:239）[tomcat-embed -core-8.0.20.jar：8.0.20] 
在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）[tomcat-embed-core-8.0.20.jar：8.0 .20] 
 at org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:330）[spring-security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
 at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke（FilterSecurityInterceptor.java:118）[spring-security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
在org.springframework.security.web.access.intercept.FilterSecurityInterce ptor.doFilter（FilterSecurityInterceptor.java:84）[spring-security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
 at org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（ FilterChainProxy.java:342）[spring-security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
 at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter（ExceptionTranslationFilter.java： 113）[spring-security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
 at org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）[spring -security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
在org.springframework.security.web.session.SessionManagementFilter.doFilter（SessionManagementFilter.java:103）[spring-security-web -3.2.3.RELEASE.jar：3.2.3.RELEASE] 
 at org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）[spring-security-web-3.2.3 .RELEASE.jar：3.2.3.RELEASE] 
在org.springframework .security.web.authentication.AnonymousAuthenticationFilter.doFilter（AnonymousAuthenticationFilter.java:113）[spring-security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
 at org.springframework.security.web .FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）[spring-security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
 at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter .doFilter（SecurityContextHolderAwareRequestFilter.java:154）[spring-security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
 at org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy .java：342）[spring-security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
 at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter（RequestCacheAwareFilter.java:45 ）[spring-security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
 at org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.ja va：342）[spring-security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
在org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationProcessingFilter.doFilter（OAuth2AuthenticationProcessingFilter.java： 140）[spring-security-oauth2-2.0.2.RELEASE.jar：na] 
 at org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）[spring-security-web -3.2.3.RELEASE.jar：3.2.3.RELEASE] 
在org.springframework.security.web.authentication.logout.LogoutFilter.doFilter（LogoutFilter.java:110）[spring-security-web-3.2 .3.RELEASE.jar：3.2.3.RELEASE] 
在org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）[spring-security-web-3.2.3.RELEASE .jar：3.2.3.RELEASE] 
在org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal（HeaderWriterFilter.java:57）[spring-security-web-3.2.3.RELEASE.jar：3.2 .3.RELEASE] 
在org.springframework.web.filter.OncePe $ RepositoryFilter.doFilter（OncePerRequestFilter.java:107） java：342）[spring-security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
 at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter（SecurityContextPersistenceFilter.java:87） [spring-security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
 at org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）[spring-security -web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
在org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal（WebAsyncManagerIntegrationFilter.java:50）[spring-security -web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）[spring-web-4.1.5.RELEASE .jar：4.1.5.RELEASE] 
 org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）[spring-security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] $ or $ $ $ b $ org.springframework .security.web.FilterChainProxy.doFilterInternal（FilterChainProxy.java:192）[spring-security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
 at org.springframework.security.web.FilterChainProxy .doFilter（FilterChainProxy.java:160）[spring-security-web-3.2.3.RELEASE.jar：3.2.3.RELEASE] 
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java ：239）[tomcat-embed-core-8.0.20.jar：8.0.20] 
 at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）[tomcat-embed-core- 8.0.20.jar：8.0.20] 
在org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal（CharacterEncodingFilter.java:88）[spring-web-4.1.5.RELEASE.jar：4.1.5。 RELEASE] 
在org.springframework.web.filter.OncePerRequestFilter.doFilter （OncePerRequestFilter.java:107）[spring-web-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:239）[ tomcat-embed-core-8.0.20.jar：8.0.20] 
在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）[tomcat-embed-core-8.0.20。 jar：8.0.20] 
 at org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:219）[tomcat-embed-core-8.0.20.jar：8.0.20] 
 at org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:106）[tomcat-embed-core-8.0.20.jar：8.0.20] 
 at org.apache.catalina.authenticator.AuthenticatorBase .invoke（AuthenticatorBase.java:501）[tomcat-embed-core-8.0.20.jar：8.0.20] 
 at org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:142）[ tomcat-embed-core-8.0.20.jar：8.0.20] 
在org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:79）[tomcat-embed -core-8.0.20.jar：8.0.20] 
在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:88）[tomcat-embed-core-8.0.20.jar：8.0 .20] 
 at org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:516）[tomcat-embed-core-8.0.20.jar：8.0.20] 
 at org。 apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:1086）[tomcat-embed-core-8.0.20.jar：8.0.20] 
 at org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（ 
 at org.apache.coyote.http11.Http11NioProtocol $ Http11ConnectionHandler.process（Http11NioProtocol.java:223）[tomcat-embed-core-8.0.20.jar：8.0.20] [tomcat-embed-core-8.0.20.jar： -embed-core-8.0.20.jar：8.0.20] 
在org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1558）[tomcat-embed-core-8.0 .20.jar：8.0.20] 
 at org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.run（NioEndpoint.java:1515）[tomcat-embed-core-8.0.20.jar：8.0 .20] 
 at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142）[na：1.8.0_40] 
 at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:617）[na：1.8 .0_40] 
 at org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）[tomcat-embed-core-8.0.20.jar：8.0.20] 
在java.lang.Thread.run（Thread.java:745）[na：1.8.0_40] 
引起：org.hibernate.exception.ConstraintViolationException：无法执行语句
在org.hibernate .exception.internal.SQLExceptionTypeDelegate.convert（SQLExceptionTypeDelegate.java:72）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.exception.internal.StandardSQLExceptionConverter。 （org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert）（SqlExceptionHelper.java ：126）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.engine.j dbc.spi.SqlExceptionHelper.convert（SqlExceptionHelper.java:112）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl .executeUpdate（ResultSetReturnImpl.java:211）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.id.IdentityGenerator $ GetGeneratedKeysDelegate.executeAndExtract（IdentityGenerator.java： 96）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.id.insert.AbstractReturningDelegate.performInsert（AbstractReturningDelegate.java:58）〜[hibernate-core -4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.persister.entity.AbstractEntityPersister.insert（AbstractEntityPersister.java:3032）〜[hibernate-core-4.3.8.Final。 jar：4.3.8.Final] 
 at org.hibernate.persister.entity.AbstractEntityPersister.insert（AbstractEntityPersister.java:3558）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final ] 
在org.hibernate.action.internal.EntityIdentityInsertAction.execute（EntityIdentityInsertAction .java：98）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.engine.spi.ActionQueue.execute（ActionQueue.java:492）〜[ hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction（ActionQueue.java:197）〜[hibernate-core-4.3.8 .Final.jar：4.3.8.Final] 
 at org.hibernate.engine.spi.ActionQueue.addInsertAction（ActionQueue.java:181）〜[hibernate-core-4.3.8.Final.jar：4.3。 8.Final] 
 at org.hibernate.engine.spi.ActionQueue.addAction（ActionQueue.java:216）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
在org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction（AbstractSaveEventListener.java:324）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.event .internal.AbstractSaveEventListener.performSaveOrReplicate（AbstractSaveEventListener.java:288）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.event.internal.AbstractSaveEventListener.performS ave（AbstractSaveEventListener.java:194）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId（AbstractSaveEventListener.java:125 ）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.jpa.event.internal.core.JpaMergeEventListener.saveWithGeneratedId（JpaMergeEventListener.java:73）〜[ hibernate-entitymanager-4.3.8.Final.jar：4.3.8.Final] 
在org.hibernate.event.internal.DefaultMergeEventListener.saveTransientEntity（DefaultMergeEventListener.java:271）〜[hibernate-core-4.3.8 .Final.jar：4.3.8.Final] 
 at org.hibernate.event.internal.DefaultMergeEventListener.entityIsTransient（DefaultMergeEventListener.java:251）〜[hibernate-core-4.3.8.Final.jar：4.3。 8.Final] 
在org.hibernate.event.internal.DefaultMergeEventListener.onMerge（DefaultMergeEventListener.java:189）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
在org.hibernate.internal.SessionImpl.fireMerge（SessionImpl.java： 886）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.internal.SessionImpl.merge（SessionImpl.java:868）〜[hibernate-core-4.3 .8.Final.jar：4.3.8.Final] 
 at org.hibernate.engine.spi.CascadingActions $ 6.cascade（CascadingActions.java：277）〜[hibernate-core-4.3.8.Final.jar ：4.3.8.Final] 
 at org.hibernate.engine.internal.Cascade.cascadeToOne（Cascade.java:350）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.engine.internal.Cascade.cascadeAssociation（Cascade.java:293）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org。 hibernate.engine.internal.Cascade.cascadeProperty（Cascade.java:161）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
在org.hibernate.engine.internal.Cascade .cascadeCollectionElements（Cascade.java:379）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.engine.internal.Cascade.cascadeCollection（Cascade.java： 319）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.eng ine.internal.Cascade.cascadeAssociation（Cascade.java:296）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.engine.internal.Cascade.cascadeProperty （Cascade.java:161）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.engine.internal.Cascade.cascade（Cascade.java:118） 〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.event.internal.AbstractSaveEventListener.cascadeAfterSave（AbstractSaveEventListener.java:460）〜[hibernate-core-4.3 .8.Final.jar：4.3.8.Final] 
 at org.hibernate.event.internal.DefaultMergeEventListener.entityIsTransient（DefaultMergeEventListener.java:255）〜[hibernate-core-4.3.8.Final.jar： 4.3.8.Final] 
 at org.hibernate.event.internal.DefaultMergeEventListener.entityIsDetached（DefaultMergeEventListener.java:317）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.event.internal.DefaultMergeEventListener.onMerge（DefaultMergeEventListener.java:186）〜[hibernate-core-4.3.8.Final.jar：4 .3.8.Final] 
 at org.hibernate.event.internal.DefaultMergeEventListener.onMerge（DefaultMergeEventListener.java:85）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
在org.hibernate.internal.SessionImpl.fireMerge（SessionImpl.java:876）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.internal。 SessionImpl.merge（SessionImpl.java:858）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.internal.SessionImpl.merge（SessionImpl.java:863 ）〜[hibernate-core-4.3.8.Final.jar：4.3.8.Final] 
 at org.hibernate.jpa.spi.AbstractEntityManagerImpl.merge（AbstractEntityManagerImpl.java:1196）〜[hibernate-entitymanager- 4.3.8.Final.jar：4.3.8.Final] 
 at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）〜[na：1.8.0_40] 
 at sun.reflect.NativeMethodAccessorImpl.invoke （NativeMethodAccessorImpl.java:62）〜[na：1.8.0_40] 
 at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）〜[na：1.8.0_40] 
 at java.lang.reflect.Method.invoke（Method.java:497）〜[na：1.8.0_40] 
 at org.springframework.orm.jpa.ExtendedEntityManagerCreator $ ExtendedEntityManagerInvocationHandler.invoke（ExtendedEntityManagerCreator.java： 344）〜[spring-orm-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
 at com.sun.proxy。$ Proxy93.merge（Unknown Source）〜[na：na] 
 at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）〜[na：1.8.0_40] 
 at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）〜[na：1.8.0_40] 
 at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）〜[na：1.8.0_40] 
 at java.lang.reflect.Method.invoke（Method.java:497）〜[na： 1.8.0_40] 
 at org.springframework.orm.jpa.SharedEntityManagerCreator $ SharedEntityManagerInvocationHandler.invoke（SharedEntityManagerCreator.java:291）〜[spring-orm-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
 at com.sun.proxy。$ Proxy93.merge（Unknown Source）〜[na：na] 
 at org.spr ingframework.data.jpa.repository.support.SimpleJpaRepository.save（SimpleJpaRepository.java:410）〜[spring-data-jpa-1.7.2.RELEASE.jar：na] 
 at sun.reflect.NativeMethodAccessorImpl.invoke0 （Native Method）〜[na：1.8.0_40] 
 at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）〜[na：1.8.0_40] 
 at sun.reflect.DelegatingMethodAccessorImpl。 invoke（DelegatingMethodAccessorImpl.java:43）〜[na：1.8.0_40] 
 at java.lang.reflect.Method.invoke（Method.java:497）〜[na：1.8.0_40] 
 at org.springframework.data.repository.core.support.RepositoryFactorySupport $ QueryExecutorMethodInterceptor.executeMethodOn（RepositoryFactorySupport.java:416）〜[spring-data-commons-1.9.2.RELEASE.jar：na] 
 at org.springframework .data.repository.core.support.RepositoryFactorySupport $ QueryExecutorMethodInterceptor.doInvoke（RepositoryFactorySupport.java:401）〜[spring-data-commons-1.9.2.RELEASE.jar：na] 
在org.springframework.data。 repository.core.support.Repos itoryFactorySupport $ QueryExecutorMethodInterceptor.invoke（RepositoryFactorySupport.java:373）〜[spring-data-commons-1.9.2.RELEASE.jar：na] 
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed（ReflectiveMethodInvocation.java ：179）〜[spring-aop-4.1.5.RELEASE.jar：4.1.5.RELEASE] 
 at org.springframework.data.repository.core.support.RepositoryFactorySupport $ DefaultMethodInvokingMethodInterceptor.invoke（RepositoryFactorySupport.java： 486）〜[spring-data-commons-1.9.2.RELEASE.jar：na] 
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed（ReflectiveMethodInvocation.java:179）〜[spring-aop-4.1 .5.RELEASE.jar：4.1.5.RELEASE] 
  
请帮忙。我做错了什么？为什么hibernate在映射时抱怨用户名为空？ 
 
 
 
谢谢，
 Vijay 
解决方案 
Finally I found the solution. It is an issue with Jackson json unmarshalling. What is missing is a way to tell the object mapper about the one to many relationship, only then it will create parent and child objects properly upon which hibernate handles the rest of the stuff. Luckily Jackson has two annotations  @JsonManagedReference, @JsonBackReference to tell the object mapper about the relationship. Updated code - 
 
  
 
User.java
@Data 
 @Entity 
 @Table(name = \"users\", uniqueConstraints={ @UniqueConstraint(columnNames={\"username\"})}) 
 public class User { 
  
     @Id 
     @CustomEmailValidator 
     @Size.List ({ 
             @Size(min=5, message=\"The field must be at least {min} characters\"), 
             @Size(max=100, message=\"The field must be less than {max} characters\") 
     }) 
     private String username; 
  
     @Basic 
     @Column(name = \"enabled\", columnDefinition = \"BIT\", length = 1) 
     private boolean enabled; 
  
     @@JsonManagedReference 
     @OneToMany(cascade = {CascadeType.ALL,CascadeType.PERSIST,CascadeType.MERGE}, mappedBy = \"user\") 
     @Column(nullable = false) 
     private List<Authority> authorities = new ArrayList<>(); 
 } 
 
Authority.java
@Data 
 @Entity 
 @Table(name =\"authorities\") 
 public class Authority { 
  
     @Id 
     @GeneratedValue(strategy = GenerationType.AUTO) 
     private Long id; 
 
 @版本
私人整数版本; 
  
     @NotNull 
     @Size.List ({ 
             @Size(min=5, message=\"The field must be at least {min} characters\"), 
             @Size(max=100, message=\"The field must be less than {max} characters\") 
     }) 
     private String authority; 
  
     @JsonBackReference 
     @ManyToOne(fetch = FetchType.EAGER) 
     @JoinColumn(name = \"username\", nullable=false) 
     private User user; 
 } 
 
One more point if we use Set<> instead of List<> to hold the child objects, we should alter the equals and hash code methods properly as mentioned here - 
 
 
I have two JPA entities User and Authority, User the parent and Authority is the child. There is one to many relationship between User and Authority. 
User -
@Data
@Entity
@Table(name = "users", uniqueConstraints={ @UniqueConstraint(columnNames={"username"})})
public class User {

    @Id
    @CustomEmailValidator
    @Size.List ({
            @Size(min=5, message="The field must be at least {min} characters"),
            @Size(max=100, message="The field must be less than {max} characters")
    })
    private String username;

    @Basic
    @Column(name = "enabled", columnDefinition = "BIT", length = 1)
    private boolean enabled;

    @OneToMany(cascade = {CascadeType.ALL,CascadeType.PERSIST,CascadeType.MERGE}, mappedBy = "user")
    @Column(nullable = false)
    private List<Authority> authorities = new ArrayList<>();
}

Authority -
@Data
@Entity
@Table(name ="authorities")
public class Authority {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Version
    private Integer version;

    @NotNull
    @Size.List ({
            @Size(min=5, message="The field must be at least {min} characters"),
            @Size(max=100, message="The field must be less than {max} characters")
    })
    private String authority;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "username", nullable=false)
    private User user;
}

I have exposed User as a Spring Data Rest repository. When I dohttp://localhost/api/usersI am able to see uses to list along with Authorities. However when I try to create a user along with authorities using the following json -
{
   "username": "cmsdeveloper222@amnesty.org.in",
   "enabled": true,
   "authorities": [
    {

       "authority": "ROLE_ADMIN"
    }
    ]

}

I get the following error -
{
    "cause": {
        "cause": {
            "cause": null,
            "message": "Column 'username' cannot be null"
        },
        "message": "could not execute statement"
    },
    "message": "could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement"
}

The underlying exception is -
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'username' cannot be null
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_40]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_40]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_40]
    at java.lang.reflect.Constructor.newInstance(Constructor.java:422) ~[na:1.8.0_40]
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:377) ~[mysql-connector-java-5.1.34.jar:5.1.34]
    at com.mysql.jdbc.Util.getInstance(Util.java:360) ~[mysql-connector-java-5.1.34.jar:5.1.34]
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:971) ~[mysql-connector-java-5.1.34.jar:5.1.34]
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887) ~[mysql-connector-java-5.1.34.jar:5.1.34]
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3823) ~[mysql-connector-java-5.1.34.jar:5.1.34]
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435) ~[mysql-connector-java-5.1.34.jar:5.1.34]
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582) ~[mysql-connector-java-5.1.34.jar:5.1.34]
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2530) ~[mysql-connector-java-5.1.34.jar:5.1.34]
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1907) ~[mysql-connector-java-5.1.34.jar:5.1.34]
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2141) ~[mysql-connector-java-5.1.34.jar:5.1.34]
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2077) ~[mysql-connector-java-5.1.34.jar:5.1.34]
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2062) ~[mysql-connector-java-5.1.34.jar:5.1.34]
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:208) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    ... 151 common frames omitted
Hibernate: select count(campaign0_.id) as col_0_0_ from Campaign campaign0_
Hibernate: select campaign0_.id as id1_0_, campaign0_.campaignId as campaign2_0_, campaign0_.emailOfTheCreator as emailOfT3_0_, campaign0_.endDate as endDate4_0_, campaign0_.name as name5_0_, campaign0_.startDate as startDat6_0_, campaign0_.status as status7_0_, campaign0_.summary as summary8_0_, campaign0_.version as version9_0_ from Campaign campaign0_ limit ?
Hibernate: select user0_.username as username1_3_1_, user0_.enabled as enabled2_3_1_, authoritie1_.username as username4_3_3_, authoritie1_.id as id1_2_3_, authoritie1_.id as id1_2_0_, authoritie1_.authority as authorit2_2_0_, authoritie1_.username as username4_2_0_, authoritie1_.version as version3_2_0_ from users user0_ left outer join authorities authoritie1_ on user0_.username=authoritie1_.username where user0_.username=?
Hibernate: insert into users (enabled, username) values (?, ?)
Hibernate: insert into authorities (authority, username, version) values (?, ?, ?)
16:48:14.260 [http-nio-8080-exec-1] WARN  o.h.e.jdbc.spi.SqlExceptionHelper - SQL Error: 1048, SQLState: 23000
16:48:14.267 [http-nio-8080-exec-1] ERROR o.h.e.jdbc.spi.SqlExceptionHelper - Column 'username' cannot be null
16:48:14.271 [http-nio-8080-exec-1] WARN  o.h.e.jdbc.spi.SqlExceptionHelper - SQL Warning Code: 1048, SQLState: 23000
16:48:14.271 [http-nio-8080-exec-1] WARN  o.h.e.jdbc.spi.SqlExceptionHelper - Column 'username' cannot be null
16:48:14.308 [http-nio-8080-exec-1] ERROR o.s.d.r.w.AbstractRepositoryRestController - could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement
org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:248) ~[spring-orm-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:214) ~[spring-orm-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:417) ~[spring-orm-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59) ~[spring-tx-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213) ~[spring-tx-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147) ~[spring-tx-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodIntercceptor.invoke(CrudMethodMetadataPostProcessor.java:122) ~[spring-data-jpa-1.7.2.RELEASE.jar:na]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207) ~[spring-aop-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at com.sun.proxy.$Proxy98.save(Unknown Source) ~[na:na]
    at org.springframework.data.rest.core.invoke.CrudRepositoryInvoker.invokeSave(CrudRepositoryInvoker.java:106) ~[spring-data-rest-core-2.2.2.RELEASE.jar:na]
    at org.springframework.data.rest.webmvc.RepositoryEntityController.createAndReturn(RepositoryEntityController.java:414) ~[spring-data-rest-webmvc-2.2.2.RELEASE.jar:na]
    at org.springframework.data.rest.webmvc.RepositoryEntityController.postCollectionResource(RepositoryEntityController.java:232) ~[spring-data-rest-webmvc-2.2.2.RELEASE.jar:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_40]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_40]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_40]
    at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_40]
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) ~[spring-web-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137) ~[spring-web-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) ~[spring-webmvc-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:777) ~[spring-webmvc-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:706) ~[spring-webmvc-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943) ~[spring-webmvc-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877) ~[spring-webmvc-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966) [spring-webmvc-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868) [spring-webmvc-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:644) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842) [spring-webmvc-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-embed-websocket-8.0.20.jar:8.0.20]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) [spring-web-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationProcessingFilter.doFilter(OAuth2AuthenticationProcessingFilter.java:140) [spring-security-oauth2-2.0.2.RELEASE.jar:na]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:57) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160) [spring-security-web-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) [spring-web-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1086) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:659) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1558) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1515) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_40]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_40]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.0.20.jar:8.0.20]
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_40]
Caused by: org.hibernate.exception.ConstraintViolationException: could not execute statement
    at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:72) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:211) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:96) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:58) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3032) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3558) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:98) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:492) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:197) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:181) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:216) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:324) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:288) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:194) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.jpa.event.internal.core.JpaMergeEventListener.saveWithGeneratedId(JpaMergeEventListener.java:73) ~[hibernate-entitymanager-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.event.internal.DefaultMergeEventListener.saveTransientEntity(DefaultMergeEventListener.java:271) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.event.internal.DefaultMergeEventListener.entityIsTransient(DefaultMergeEventListener.java:251) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:189) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.internal.SessionImpl.fireMerge(SessionImpl.java:886) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:868) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.engine.spi.CascadingActions$6.cascade(CascadingActions.java:277) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:350) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:293) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:161) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:379) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:319) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:296) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:161) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:118) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.event.internal.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:460) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.event.internal.DefaultMergeEventListener.entityIsTransient(DefaultMergeEventListener.java:255) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.event.internal.DefaultMergeEventListener.entityIsDetached(DefaultMergeEventListener.java:317) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:186) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:85) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.internal.SessionImpl.fireMerge(SessionImpl.java:876) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:858) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:863) ~[hibernate-core-4.3.8.Final.jar:4.3.8.Final]
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:1196) ~[hibernate-entitymanager-4.3.8.Final.jar:4.3.8.Final]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_40]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_40]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_40]
    at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_40]
    at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:344) ~[spring-orm-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at com.sun.proxy.$Proxy93.merge(Unknown Source) ~[na:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_40]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_40]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_40]
    at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_40]
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:291) ~[spring-orm-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at com.sun.proxy.$Proxy93.merge(Unknown Source) ~[na:na]
    at org.springframework.data.jpa.repository.support.SimpleJpaRepository.save(SimpleJpaRepository.java:410) ~[spring-data-jpa-1.7.2.RELEASE.jar:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_40]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_40]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_40]
    at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_40]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:416) ~[spring-data-commons-1.9.2.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:401) ~[spring-data-commons-1.9.2.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:373) ~[spring-data-commons-1.9.2.RELEASE.jar:na]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.1.5.RELEASE.jar:4.1.5.RELEASE]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$DefaultMethodInvokingMethodInterceptor.invoke(RepositoryFactorySupport.java:486) ~[spring-data-commons-1.9.2.RELEASE.jar:na]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.1.5.RELEASE.jar:4.1.5.RELEASE]

Please help. What I am doing wrong? Why hibernate complains the username is null when I have mapping? Is it possible that my json is not converted properly?
Thanks,Vijay
 解决方案 
Finally I found the solution. It is an issue with Jackson json unmarshalling. What is missing is a way to tell the object mapper about the one to many relationship, only then it will create parent and child objects properly upon which hibernate handles the rest of the stuff. Luckily Jackson has two annotations  @JsonManagedReference, @JsonBackReference to tell the object mapper about the relationship. Updated code - 
User.java
@Data
@Entity
@Table(name = "users", uniqueConstraints={ @UniqueConstraint(columnNames={"username"})})
public class User {

    @Id
    @CustomEmailValidator
    @Size.List ({
            @Size(min=5, message="The field must be at least {min} characters"),
            @Size(max=100, message="The field must be less than {max} characters")
    })
    private String username;

    @Basic
    @Column(name = "enabled", columnDefinition = "BIT", length = 1)
    private boolean enabled;

    @@JsonManagedReference
    @OneToMany(cascade = {CascadeType.ALL,CascadeType.PERSIST,CascadeType.MERGE}, mappedBy = "user")
    @Column(nullable = false)
    private List<Authority> authorities = new ArrayList<>();
}

Authority.java
@Data
@Entity
@Table(name ="authorities")
public class Authority {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Version
    private Integer version;

    @NotNull
    @Size.List ({
            @Size(min=5, message="The field must be at least {min} characters"),
            @Size(max=100, message="The field must be less than {max} characters")
    })
    private String authority;

    @JsonBackReference
    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "username", nullable=false)
    private User user;
}

One more point if we use Set<> instead of List<> to hold the child objects, we should alter the equals and hash code methods properly as mentioned here -Jackson bug (or feature!?) when using java.util.Set - mySet.size() is always 1
                        
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09-05 01:53
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