在JavaEE应用程序中使用hibernate时堆空间不足
我目前正在开发一个Glassfish应用程序。要允许业务EJB与MySQL后端通信，有以下结构： 接口项目在JavaEE应用程序中使用hibernate时堆空间不足,hibernate,jpa,jakarta-ee,glassfish,javabeans,Hibernate,Jpa,Jakarta Ee,Glassfish,Javabeans,我目前正在开发一个Glassfish应用程序。要允许业务EJB与MySQL后端通信，有以下结构： 接口项目 域项目 JPA/ORM项目（Hibernate） 接口项目包含模型和IDomainFacadeBean的接口。域项目包含映射到JPA类的这些接口的实现。JPA类由eclipse生成。业务EJB通过JNDI查找检索DomainFacadeBean 为了实现这一点，我必须将自动生成的JPA类的加载设置为EAGER。这在我的测试数据库上运行得很好，但当我在生产数据库上尝试此操作时，应用程序崩溃，
域项目
JPA/ORM项目（Hibernate） 接口项目包含模型和IDomainFacadeBean的接口。域项目包含映射到JPA类的这些接口的实现。JPA类由eclipse生成。业务EJB通过JNDI查找检索DomainFacadeBean 为了实现这一点，我必须将自动生成的JPA类的加载设置为EAGER。这在我的测试数据库上运行得很好，但当我在生产数据库上尝试此操作时，应用程序崩溃，日志显示一个长异常，该异常以：
导致：java.lang.OutOfMemoryError:java heap space]]- 禁用hibernate日志记录（）-我认为这不是问题所在，因为链接答案中的stacktrace与我的应用程序抛出的结果不同
- 增加JVM内存大小——我的同事已经尝试过了，并将内存大小设置为2GB。同样的问题似乎也发生了，但不应该发生，因为数据库的大小只有大约200MB
- 使用LAZY而不是EAGER loading（）-我认为这是解决方案，尽管我不知道如何在我目前使用的体系结构中实现这一点。当我第一次尝试这个方法时，hibernate抛出了
，我没有数据可以处理。我知道避免这种情况的关键是在使用对象时保持会话活动，但这意味着业务EJB负责数据存储；我想避免的事情LazyInitializationException
javax.ejb.EJBException
at com.sun.ejb.containers.EJBContainerTransactionManager.processSystemException(EJBContainerTransactionManager.java:748)
at com.sun.ejb.containers.EJBContainerTransactionManager.checkExceptionNoTx(EJBContainerTransactionManager.java:638)
at com.sun.ejb.containers.EJBContainerTransactionManager.checkExceptionBeanMgTx(EJBContainerTransactionManager.java:597)
at com.sun.ejb.containers.EJBContainerTransactionManager.postInvokeTx(EJBContainerTransactionManager.java:467)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4475)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2009)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1979)
at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:212)
at com.sun.ejb.containers.EJBObjectInvocationHandlerDelegate.invoke(EJBObjectInvocationHandlerDelegate.java:79)
at com.sun.proxy.$Proxy326.getAllWlcs(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.privateInvoke(StubInvocationHandlerImpl.java:239)
at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.invoke(StubInvocationHandlerImpl.java:150)
at com.sun.corba.ee.impl.presentation.rmi.codegen.CodegenStubBase.invoke(CodegenStubBase.java:226)
at nl.XXX.interfaces.domain.__IDomainFacadeBean_Remote_DynamicStub.getAllWlcs(nl/XXX/interfaces/domain/__IDomainFacadeBean_Remote_DynamicStub.java)
at nl.XXX.interfaces.domain._IDomainFacadeBean_Wrapper.getAllWlcs(nl/XXX/interfaces/domain/_IDomainFacadeBean_Wrapper.java)
at nl.XXX.operations.OperationsTimerBean.refreshProductionStatus(OperationsTimerBean.java:87)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1081)
at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1153)
at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:4695)
at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:630)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582)
at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:55)
at sun.reflect.GeneratedMethodAccessor123.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCall(SystemInterceptorProxy.java:163)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundTimeout(SystemInterceptorProxy.java:145)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:369)
at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:4667)
at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4655)
at com.sun.ejb.containers.BaseContainer.callEJBTimeout(BaseContainer.java:3993)
at com.sun.ejb.containers.EJBTimerService.deliverTimeout(EJBTimerService.java:1199)
at com.sun.ejb.containers.EJBTimerService.access$000(EJBTimerService.java:89)
at com.sun.ejb.containers.EJBTimerService$TaskExpiredWork.run(EJBTimerService.java:1919)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: Unable to release JDBC Connection
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:147)
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:155)
at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1407)
at org.hibernate.Query.getResultList(Query.java:427)
at nl.XXX.orm.repositories.Repository.getAll(Repository.java:119)
at nl.XXX.orm.beans.OrmFacadeBean.getAllWlcs(OrmFacadeBean.java:68)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1081)
at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1153)
at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:4695)
at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:630)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582)
at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:46)
at sun.reflect.GeneratedMethodAccessor123.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCall(SystemInterceptorProxy.java:163)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:140)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:369)
at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:4667)
at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4655)
at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:205)
... 49 more
Caused by: org.hibernate.exception.JDBCConnectionException: Unable to release JDBC Connection
at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:48)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:97)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.releaseConnection(LogicalConnectionManagedImpl.java:192)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.afterTransaction(LogicalConnectionManagedImpl.java:155)
at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.afterTransaction(JdbcCoordinatorImpl.java:282)
at org.hibernate.internal.SessionImpl.afterOperation(SessionImpl.java:540)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1478)
at org.hibernate.query.internal.AbstractProducedQuery.doList(AbstractProducedQuery.java:1426)
at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1398)
... 81 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
at com.mysql.jdbc.Util.getInstance(Util.java:408)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:918)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:897)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:886)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860)
at com.mysql.jdbc.ConnectionImpl.throwConnectionClosedException(ConnectionImpl.java:1246)
at com.mysql.jdbc.ConnectionImpl.checkClosed(ConnectionImpl.java:1241)
at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:4801)
at org.hibernate.engine.jdbc.connections.internal.PooledConnections.add(PooledConnections.java:68)
at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.closeConnection(DriverManagerConnectionProviderImpl.java:195)
at org.hibernate.internal.NonContextualJdbcConnectionAccess.releaseConnection(NonContextualJdbcConnectionAccess.java:46)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.releaseConnection(LogicalConnectionManagedImpl.java:189)
... 87 more
Caused by: java.lang.OutOfMemoryError: Java heap space
]]
如果出现OutOfMemory错误，那是因为内存不足。这意味着2GB对于您的应用程序来说是不够的。您需要做的是分析正在运行的应用程序（例如，使用VisualVM或类似工具），以查看堆在做什么。您可能遇到内存泄漏，或者您编写应用程序的方式可能会导致保留过多的数据。我假设在生产系统上加载数据可能会强制应用程序加载大量数据。您应该熟悉懒散加载的用法，并构建一个正确的体系结构，例如，使用重新附加的对象来懒散地加载对象的数据。