WebSphere 9 上的休眠间接 JNDI 绑定

Question

我在 websphere 上的数据源间接 jndi 绑定有问题。

我在我的 web.xml 中添加了资源：

<resource-ref>
    <description>Data Source JNDI</description>
    <res-ref-name>jdbc/RESOURCE_L</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
</resource-ref> 

在我的 ibm-web-bnd.xml 中的资源引用：

<resource-ref name="jdbc/RESOURCE_L" binding-name="jdbc/DATAS_ON_WAS" />

在我的 persistence.xml 中，jta-data-source:

<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<jta-data-source>java:comp/env/jdbc/RESOURCE_L</jta-data-source>

应用程序启动时出现此错误：

 ERROR IdTableHelper:94 - Unable to use JDBC Connection to create Statement
java.sql.SQLException: Unsupported use of GenericConnection.  A GenericConnection is provided during application start when creating an EntityManagerFactory for a persistence unit which has configured one of its datasource to be in the component naming context; java:comp/env. During application start, the component naming context will not exist, and the correct datasource cannot be determined. When the persistence unit is used, the proper datasource and connection will be obtained and used.
    at com.ibm.ws.jpa.management.GenericConnection.unsupportedUseSQLException(GenericConnection.java:636)
    at com.ibm.ws.jpa.management.GenericConnection.createStatement(GenericConnection.java:144)
    at org.hibernate.hql.spi.id.IdTableHelper.executeIdTableCreationStatements(IdTableHelper.java:77)
    at org.hibernate.hql.spi.id.global.GlobalTemporaryTableBulkIdStrategy.finishPreparation(GlobalTemporaryTableBulkIdStrategy.java:125)
    at org.hibernate.hql.spi.id.global.GlobalTemporaryTableBulkIdStrategy.finishPreparation(GlobalTemporaryTableBulkIdStrategy.java:42)
    at org.hibernate.hql.spi.id.AbstractMultiTableBulkIdStrategyImpl.prepare(AbstractMultiTableBulkIdStrategyImpl.java:88)
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:303)
    at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:467)
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:939)
    at org.hibernate.jpa.HibernatePersistenceProvider.createContainerEntityManagerFactory(HibernatePersistenceProvider.java:149)
    at com.ibm.ws.jpa.management.JPAPUnitInfo.createEMFactory(JPAPUnitInfo.java:1161)
    at com.ibm.ws.jpa.management.JPAPUnitInfo.initialize(JPAPUnitInfo.java:984)
    at com.ibm.ws.jpa.management.JPAPxmlInfo.extractPersistenceUnits(JPAPxmlInfo.java:240)
    at com.ibm.ws.jpa.management.JPAScopeInfo.processPersistenceUnit(JPAScopeInfo.java:115)
    at com.ibm.ws.jpa.management.JPAApplInfo.addPersistenceUnits(JPAApplInfo.java:147)
    at com.ibm.ws.jpa.management.SharedJPAComponentImpl.startingModule(SharedJPAComponentImpl.java:322)
    at com.ibm.ws.jpa.management.JPAComponentImpl.startingDeployedModule(JPAComponentImpl.java:786)
    at com.ibm.ws.jpa.management.JPAComponentImpl.startingDeployedApplication(JPAComponentImpl.java:691)
    at com.ibm.ws.jpa.management.JPAComponentImpl.stateChanged(JPAComponentImpl.java:551)
    at com.ibm.ws.runtime.component.ApplicationMgrImpl$ComparableDeployedObjectListener.stateChanged(ApplicationMgrImpl.java:2652)
    at com.ibm.ws.runtime.component.ApplicationMgrImpl.stateChanged(ApplicationMgrImpl.java:1178)
    at com.ibm.ws.runtime.component.DeployedApplicationImpl.fireDeployedObjectEvent(DeployedApplicationImpl.java:1561)
    at com.ibm.ws.runtime.component.DeployedApplicationImpl.setState(DeployedApplicationImpl.java:320)
    at com.ibm.ws.runtime.component.DeployedApplicationImpl.start(DeployedApplicationImpl.java:1144)
    at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:800)
    at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplicationDynamically(ApplicationMgrImpl.java:1450)
    at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:2311)
    at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.start(CompositionUnitMgrImpl.java:436)
    at com.ibm.ws.runtime.component.CompositionUnitImpl.start(CompositionUnitImpl.java:123)
    at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.start(CompositionUnitMgrImpl.java:379)
    at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.access$500(CompositionUnitMgrImpl.java:127)
    at com.ibm.ws.runtime.component.CompositionUnitMgrImpl$1.run(CompositionUnitMgrImpl.java:654)
    at com.ibm.ws.security.auth.ContextManagerImpl.runAs(ContextManagerImpl.java:5574)
    at com.ibm.ws.security.auth.ContextManagerImpl.runAsSystem(ContextManagerImpl.java:5700)
    at com.ibm.ws.security.core.SecurityContext.runAsSystem(SecurityContext.java:255)
    at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.startCompositionUnit(CompositionUnitMgrImpl.java:668)
    at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.startCompositionUnit(CompositionUnitMgrImpl.java:612)
    at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:1340)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:90)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
    at java.lang.reflect.Method.invoke(Method.java:508)
    at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:83)
    at sun.reflect.GeneratedMethodAccessor36.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
    at java.lang.reflect.Method.invoke(Method.java:508)
    at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:287)
    at javax.management.modelmbean.RequiredModelMBean$4.run(RequiredModelMBean.java:1263)
    at java.security.AccessController.doPrivileged(AccessController.java:673)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
    at javax.management.modelmbean.RequiredModelMBean.invokeMethod(RequiredModelMBean.java:1257)
    at javax.management.modelmbean.RequiredModelMBean.invoke(RequiredModelMBean.java:1096)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:831)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:813)
    at com.ibm.ws.management.AdminServiceImpl$1.run(AdminServiceImpl.java:1350)
    at com.ibm.ws.security.util.AccessController.doPrivileged(AccessController.java:118)
    at com.ibm.ws.management.AdminServiceImpl.invoke(AdminServiceImpl.java:1243)
    at com.ibm.ws.management.application.sync.StartDeploymentTask.startDeployment(StartDeploymentTask.java:249)
    at com.ibm.ws.management.application.sync.StartDeploymentTask.fullAppUpdate(StartDeploymentTask.java:121)
    at com.ibm.ws.management.application.sync.StartDeploymentTask.performTask(StartDeploymentTask.java:109)
    at com.ibm.ws.management.application.sync.AppBinaryProcessor$ExpandApp.expand(AppBinaryProcessor.java:1770)
    at com.ibm.ws.management.application.sync.AppBinaryProcessor.postProcessSynchronousExt(AppBinaryProcessor.java:811)
    at com.ibm.ws.management.bla.sync.BLABinaryProcessor.postProcess(BLABinaryProcessor.java:599)
    at com.ibm.ws.management.bla.sync.BLABinaryProcessor.onChangeCompletion(BLABinaryProcessor.java:476)
    at com.ibm.ws.management.bla.sync.BinaryProcessorWrapper.onChangeCompletion(BinaryProcessorWrapper.java:109)
    at com.ibm.ws.management.repository.FileRepository.postNotify(FileRepository.java:1938)
    at com.ibm.ws.management.repository.FileRepository.update(FileRepository.java:1442)
    at com.ibm.ws.management.repository.client.LocalConfigRepositoryClient.update(LocalConfigRepositoryClient.java:189)
    at com.ibm.ws.sm.workspace.impl.WorkSpaceMasterRepositoryAdapter.update(WorkSpaceMasterRepositoryAdapter.java:667)
    at com.ibm.ws.sm.workspace.impl.RepositoryContextImpl.update(RepositoryContextImpl.java:1998)
    at com.ibm.ws.sm.workspace.impl.RepositoryContextImpl.synch(RepositoryContextImpl.java:1946)
    at com.ibm.ws.sm.workspace.impl.WorkSpaceImpl.synch(WorkSpaceImpl.java:549)
    at com.ibm.ws.console.core.action.SyncWorkSpaceAction$1.run(SyncWorkSpaceAction.java:284)
    at com.ibm.ws.security.auth.ContextManagerImpl.runAs(ContextManagerImpl.java:5574)
    at com.ibm.ws.security.auth.ContextManagerImpl.runAsSystem(ContextManagerImpl.java:5700)
    at com.ibm.ws.security.core.SecurityContext.runAsSystem(SecurityContext.java:255)
    at com.ibm.ws.console.core.action.SyncWorkSpaceAction.execute(SyncWorkSpaceAction.java:288)
    at org.apache.struts.action.RequestProcessor.processActionPerform(Unknown Source)
    at org.apache.struts.action.RequestProcessor.process(Unknown Source)
    at org.apache.struts.action.ActionServlet.process(Unknown Source)
    at org.apache.struts.action.ActionServlet.doGet(Unknown Source)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1235)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:779)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:478)
    at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:178)
    at com.ibm.ws.webcontainer.filter.WebAppFilterChain.invokeTarget(WebAppFilterChain.java:143)
    at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:96)
    at com.ibm.ws.console.core.servlet.WSCUrlFilter.setUpCommandAssistance(WSCUrlFilter.java:971)
    at com.ibm.ws.console.core.servlet.WSCUrlFilter.continueStoringTaskState(WSCUrlFilter.java:518)
    at com.ibm.ws.console.core.servlet.WSCUrlFilter.doFilter(WSCUrlFilter.java:339)
    at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:197)
    at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:90)
    at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:969)
    at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1109)
    at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:4217)
    at com.ibm.ws.webcontainer.webapp.WebAppImpl.handleRequest(WebAppImpl.java:2208)
    at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:304)
    at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:1030)
    at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1817)
    at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:382)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:465)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:532)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:318)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:289)
    at com.ibm.ws.ssl.channel.impl.SSLConnectionLink.determineNextChannel(SSLConnectionLink.java:1187)
    at com.ibm.ws.ssl.channel.impl.SSLConnectionLink$MyReadCompletedCallback.complete(SSLConnectionLink.java:694)
    at com.ibm.ws.ssl.channel.impl.SSLReadServiceContext$SSLReadCompletedCallback.complete(SSLReadServiceContext.java:1833)
    at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:175)
    at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
    at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
    at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
    at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
    at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
    at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
    at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1909)

在此异常之后，持久化单元资源被正确加载

INFO  LogHelper:31 - HHH000204: Processing PersistenceUnitInfo [
    name: mypersistence
    ...]

而且该应用程序似乎运行良好。

我想了解为什么会出现此异常以及如何解决此问题。 有什么想法吗？

非常感谢你

Answer 1

您看到的是 Hibernate 在尝试使用 GenericConnection 时抛出异常，GenericConnection 是 java.sql.Connection 的 WebSphere 内部模型。你看，当 WebSphere 启动一个应用程序时，它必须在应用程序启动过程中尽早注册 Class Transformers，因为一旦应用程序 ClassLoader 加载了一个类，它就不再有资格进行进一步的转换（JPA 持久性提供程序可能会增强具有持久性的类并添加内部操作所需的其他方法和字段）。 Class Transformer 只能通过引导一个 EntityManagerFactor 来获得，该 EntityManagerFactor 然后注册到应用程序 ClassLoader，该应用程序将此后加载的任何类传递给转换器，然后才可用于运行时。

问题是，此时在应用程序启动阶段，资源引用绑定尚未建立。因此，在其定义中使用 java:comp/env 引用的持久性单元依赖于尚未解析的资源。

为了解决这个问题，对于使用 java:comp/env 数据源的持久性单元，WebSphere 引导 EntityManagerFactory 专门用于收集 Class Transformer（因此它不会用于创建服务应用程序注入的 EntityManagers，这将如果使用具有全局 JNDI 名称的数据源通常是这种情况）并且如果 JPA 持久性提供程序要求提供数据源（通常是这种情况，以确定数据库供应商），它会提供一个模拟数据源，即您在中看到的 GenericDataSource你的日志。 OpenJPA 和 Eclipselink 不会产生错误，但 Hibernate 会。

您的应用程序仍然可以工作的原因是因为该EntityManagerFactory仅用于获取和注册Class Transformer，它不用于为应用程序注入提供EntityManagers。基本上，对于每个具有自己的资源引用绑定（即 EJB 会话 Bean、Web 模块等）的组件上下文，都会创建一个新的 EntityManagerFactory，它会在该组件的上下文中查找数据源。

这就是为什么尽管日志中有错误，您的应用程序仍然可以工作。