创建测试数据时遇到 NullPointerException
Envers NullPointerException when creating test data
我是 Envers 的新手 - 从今天开始。我正在使用 Envers 扩展现有的 Spring Boot 应用程序，支持审计。我注释了所有 @Entity 类 并进行了一些更改，如此处所述
所有数据库表都是完美创建的，但是当我使用 CommandLineRunner 在数据库中生成测试数据时，出现以下错误。
ERROR 17:50 o.s.b.SpringApplication.reportFailure:821: Application run failed
java.lang.IllegalStateException: Failed to execute CommandLineRunner
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:782)
at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:763)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:318)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1213)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1202)
at com.agiletunes.productmanager.ProdMgrApp.init(ProdMgrApp.java:59)
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:841)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication9(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.springframework.transaction.TransactionSystemException: Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Error while committing the transaction
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:541)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:746)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:714)
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:534)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:305)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)
at com.agiletunes.productmanager.services.DatabaseTestInitializationService$$EnhancerBySpringCGLIB$d47d4b.createTestData(<generated>)
at com.agiletunes.productmanager.ProdMgrApp.lambda(ProdMgrApp.java:129)
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:779)
... 8 common frames omitted
Caused by: javax.persistence.RollbackException: Error while committing the transaction
at org.hibernate.internal.ExceptionConverterImpl.convertCommitException(ExceptionConverterImpl.java:81)
at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:107)
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:532)
... 18 common frames omitted
Caused by: java.lang.NullPointerException: null
at org.hibernate.envers.event.spi.BaseEnversEventListener.addCollectionChangeWorkUnit(BaseEnversEventListener.java:109)
at org.hibernate.envers.event.spi.BaseEnversEventListener.generateBidirectionalCollectionChangeWorkUnits(BaseEnversEventListener.java:76)
at org.hibernate.envers.event.spi.EnversPostInsertEventListenerImpl.onPostInsert(EnversPostInsertEventListenerImpl.java:49)
at org.hibernate.action.internal.EntityInsertAction.postInsert(EntityInsertAction.java:168)
at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:135)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:604)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:478)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:356)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39)
at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1454)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:511)
at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3290)
at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2486)
at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:473)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:178)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access0(JdbcResourceLocalTransactionCoordinatorImpl.java:39)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:271)
at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:104)
... 19 common frames omitted
INFO 17:50 o.s.o.j.AbstractEntityManagerFactoryBean.destroy:597: Closing JPA EntityManagerFactory for persistence unit 'default'
INFO 17:50 c.z.h.HikariDataSource.close:350: HikariPool-1 - Shutdown initiated...
INFO 17:50 c.z.h.HikariDataSource.close:352: HikariPool-1 - Shutdown completed.
在我添加 Envers 和缩短字符串之前，如上面其他 Whosebug 条目中所述，我可以完美地生成测试数据。
问题在于，我在整个堆栈跟踪中看不到任何有用的问题来源信息。如何找出根本原因？
有趣的问题：
How to find out what is the root cause?
堆栈跟踪的最后一部分表示抛出的原始异常：
Caused by: java.lang.NullPointerException: null
at org.hibernate.envers.event.spi.BaseEnversEventListener.addCollectionChangeWorkUnit(BaseEnversEventListener.java:109)
第一个疯狂的猜测是它可能与集合 null 有关。
如果您的实体模型很小并且您可以轻松检查，那么这种猜测很有用。
如果不能解决问题，下一步就是限制范围。
删除大约一半的实体并检查问题是否仍然存在。
如果重复。
如果不试试另一半
通过这种方式将您的模型缩小到非常小的尺寸。
现在以相同的方式删除属性，直到您有一个小模型来重现该问题。
现在重复你对模型所做的事情，直到你只剩下很少的互动。
一旦您的程序如此简单，问题往往就会变得很明显。
如果不是，这是在这里提问的一个很好的基础。
或者用 Envers 报告错误。
我尝试了很多东西，但是当我在这里和那里进行更改时，我偶然发现了一个缺少 @Audited 注释的超类。现在它运行良好。
我是 Envers 的新手 - 从今天开始。我正在使用 Envers 扩展现有的 Spring Boot 应用程序，支持审计。我注释了所有 @Entity 类 并进行了一些更改，如此处所述
ERROR 17:50 o.s.b.SpringApplication.reportFailure:821: Application run failed
java.lang.IllegalStateException: Failed to execute CommandLineRunner
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:782)
at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:763)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:318)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1213)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1202)
at com.agiletunes.productmanager.ProdMgrApp.init(ProdMgrApp.java:59)
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:841)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication9(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.springframework.transaction.TransactionSystemException: Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Error while committing the transaction
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:541)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:746)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:714)
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:534)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:305)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)
at com.agiletunes.productmanager.services.DatabaseTestInitializationService$$EnhancerBySpringCGLIB$d47d4b.createTestData(<generated>)
at com.agiletunes.productmanager.ProdMgrApp.lambda(ProdMgrApp.java:129)
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:779)
... 8 common frames omitted
Caused by: javax.persistence.RollbackException: Error while committing the transaction
at org.hibernate.internal.ExceptionConverterImpl.convertCommitException(ExceptionConverterImpl.java:81)
at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:107)
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:532)
... 18 common frames omitted
Caused by: java.lang.NullPointerException: null
at org.hibernate.envers.event.spi.BaseEnversEventListener.addCollectionChangeWorkUnit(BaseEnversEventListener.java:109)
at org.hibernate.envers.event.spi.BaseEnversEventListener.generateBidirectionalCollectionChangeWorkUnits(BaseEnversEventListener.java:76)
at org.hibernate.envers.event.spi.EnversPostInsertEventListenerImpl.onPostInsert(EnversPostInsertEventListenerImpl.java:49)
at org.hibernate.action.internal.EntityInsertAction.postInsert(EntityInsertAction.java:168)
at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:135)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:604)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:478)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:356)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39)
at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1454)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:511)
at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3290)
at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2486)
at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:473)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:178)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access0(JdbcResourceLocalTransactionCoordinatorImpl.java:39)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:271)
at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:104)
... 19 common frames omitted
INFO 17:50 o.s.o.j.AbstractEntityManagerFactoryBean.destroy:597: Closing JPA EntityManagerFactory for persistence unit 'default'
INFO 17:50 c.z.h.HikariDataSource.close:350: HikariPool-1 - Shutdown initiated...
INFO 17:50 c.z.h.HikariDataSource.close:352: HikariPool-1 - Shutdown completed.
在我添加 Envers 和缩短字符串之前，如上面其他 Whosebug 条目中所述，我可以完美地生成测试数据。
问题在于，我在整个堆栈跟踪中看不到任何有用的问题来源信息。如何找出根本原因？
有趣的问题：
How to find out what is the root cause?
堆栈跟踪的最后一部分表示抛出的原始异常：
Caused by: java.lang.NullPointerException: null
at org.hibernate.envers.event.spi.BaseEnversEventListener.addCollectionChangeWorkUnit(BaseEnversEventListener.java:109)
第一个疯狂的猜测是它可能与集合 null 有关。
如果您的实体模型很小并且您可以轻松检查，那么这种猜测很有用。
如果不能解决问题，下一步就是限制范围。
删除大约一半的实体并检查问题是否仍然存在。
如果重复。
如果不试试另一半
通过这种方式将您的模型缩小到非常小的尺寸。
现在以相同的方式删除属性，直到您有一个小模型来重现该问题。
现在重复你对模型所做的事情，直到你只剩下很少的互动。
一旦您的程序如此简单，问题往往就会变得很明显。 如果不是，这是在这里提问的一个很好的基础。 或者用 Envers 报告错误。
我尝试了很多东西，但是当我在这里和那里进行更改时，我偶然发现了一个缺少 @Audited 注释的超类。现在它运行良好。