Spring 3 NPE与LazyConnectionDataSourceProxy autoCommit

我正在使用带有JPA的Spring 3,我在Web应用程序中看到了一个间歇性的问题.
我有JPA EntityManager的包装器,它调用底层的EntityManager crud方法.当我调用entityManager.persist(object)时,我有时会看到NPE;它看起来数据库连接丢失但我不是100％是什么原因.任何人都有关于可能导致以下异常的详细信息？

春季版：3.0.6.RELEASE

Spring 3 LazyConnectionDataSourceProxy.java第416行：

if (this.autoCommit != null && this.autoCommit != this.target.getAutoCommit()) {
    this.target.setAutoCommit(this.autoCommit);
}

例外：

Caused by: java.lang.NullPointerException
        at org.springframework.jdbc.datasource.LazyConnectionDataSourceProxy$LazyConnectionInvocationHandler.getTargetConnection(LazyConnectionDataSourceProxy.java:416)
        at org.springframework.jdbc.datasource.LazyConnectionDataSourceProxy$LazyConnectionInvocationHandler.invoke(LazyConnectionDataSourceProxy.java:376)
        at $Proxy64.prepareStatement(UnkNown Source)
        at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:534)
        at org.hibernate.jdbc.AbstractBatcher.prepareSelectStatement(AbstractBatcher.java:145)
        at org.hibernate.id.SequenceGenerator.generate(SequenceGenerator.java:96)
        at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:122)
        at org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:49)
        at org.hibernate.event.def.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:154)
        at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:110)
        at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:61)
        at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:646)
        at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:620)
        at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:624)
        at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:220)
        at sun.reflect.GeneratedMethodAccessor101.invoke(UnkNown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:592)
        at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240)
        at $Proxy79.persist(UnkNown Source)
        at myapp.api.dao.impl.GenericDAOImpl.save(GenericDAOImpl.java:50)
        at sun.reflect.GeneratedMethodAccessor100.invoke(UnkNown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:592)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
        at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
        at $Proxy119.save(UnkNown Source)
        at myapp.api.service.impl.backoffice.StoringServiceImpl.store(StoringServiceImpl.java:89)
        at myapp.api.service.impl.backoffice.StoringServiceImpl.storeIncludedFeatureMessage(StoringServiceImpl.java:68)
        at sun.reflect.GeneratedMethodAccessor124.invoke(UnkNown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:592)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
        at $Proxy168.storeIncludedFeatureMessage(UnkNown Source)
        at myapp.api.listener.backoffice.StorableMessageListener.processNew(StorableMessageListener.java:136)
        at myapp.api.listener.backoffice.StorableMessageListener.onMessage(StorableMessageListener.java:187)
        ... 34 more

弹簧配置：

 spring-beans-3.0.xsd
        http://www.springframework.org/schema/util
        http://www.springframework.org/schema/util/spring-util-3.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

        
                
                                 
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