使用OpenJPA在jar外部打包persistence.xml

Question

因此，我可能以一种非常规的方式使用JPA（OpenJPA 2.3.0实现）。 我正在写一个软件，该软件将维护一些人员数据并将工作分配给这些人员。 它分配的工作类型是不确定的-用户必须扩展一个映射的超类，为该类添加任何其他映射，而我的软件基本上会从那里得到它。 我们有几个遵循此模式的系统，我们只想编写一次分配代码。 但是，分配的内容之间存在细微差异-一些系统分配案例，其他系统分配较小的案例，其他系统根据客户分配，等等。

为了获得最大的可配置性，我将持久实体的所有元数据放入映射文件中，而不使用注释。 由于使用我的软件的程序员必须扩展该映射的超类并将其自己的映射添加到持久性单元，因此我不想将persistence.xml或我的映射XML打包到正在创建的jar中。 我认为程序员可以将这些文件放在耳朵的某个位置。 我使用Java SE而不是EE编写了整个内容，因此我自己创建了EntityManagerFactory而不是注入它。

我的组织正在使用实现Java EE 5的Websphere Application Server 7.0。查看Java EE 5中JPA的文档，看来我的用户将不得不将persistence.xml打包并将XML文件映射到一个单独的jar中，该jar可以放在其中耳朵的资料夹。 然后，他们可以在persistence.xml中引用我的jar文件。 类似于以下内容（我的软件名称为WAM）：

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="WAM" transaction-type="RESOURCE_LOCAL">
    <mapping-file>wamMapping.xml</mapping-file>
    <jar-file>wam-1.0.0.jar</jar-file>
</persistence-unit>

我试图以这种方式编写快速而肮脏的Web服务。 我添加了persistence.xml文件，并将XML映射到名为wam-config.jar的jar中，并将其粘贴在ear库文件夹中。 提出Web服务请求时，出现以下错误：

javax.persistence.PersistenceException: Explicit persistence provider error(s) occurred for "WAM" after trying the following discovered implementations: com.ibm.websphere.persistence.PersistenceProviderImpl, org.apache.openjpa.persistence.PersistenceProviderImpl, org.apache.openjpa.persistence.PersistenceProviderImpl, org.apache.openjpa.persistence.PersistenceProviderImpl with the following failures:
com.ibm.websphere.persistence.PersistenceProviderImpl returned: java.lang.IllegalArgumentException: The jar resource "wam-1.0.0.jar" cannot be loaded.
at org.apache.openjpa.persistence.PersistenceUnitInfoImpl.validateJarFileName(PersistenceUnitInfoImpl.java:277)
at org.apache.openjpa.persistence.PersistenceUnitInfoImpl.processJarFileNames(PersistenceUnitInfoImpl.java:239)
at org.apache.openjpa.persistence.PersistenceProductDerivation.load(PersistenceProductDerivation.java:538)
at org.apache.openjpa.persistence.PersistenceProductDerivation.load(PersistenceProductDerivation.java:335)
at org.apache.openjpa.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:89)
at com.ibm.websphere.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:73)
at com.ibm.websphere.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:43)
at org.apache.openjpa.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:154)
at org.apache.openjpa.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:65)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:150)
at gov.ssa.wam.service.BaseWAMService.initializeEntityManagerFactory(BaseWAMService.java:73)
at gov.ssa.wam.service.BaseWAMService.<init>(BaseWAMService.java:34)
at gov.ssa.wam.service.WAMServiceDelegate.getInstance(WAMServiceDelegate.java:31)
at gov.ssa.earnings.webservice.WAMServiceBean.<init>(WAMServiceBean.java:22)
at java.lang.J9VMInternals.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1474)
at com.ibm.wsspi.injectionengine.InjectionUtil.createInjectedInstance(InjectionUtil.java:79)
at com.ibm.ws.websvcs.server.WSServiceInstanceFactory.createServiceInstance(WSServiceInstanceFactory.java:110)
at org.apache.axis2.jaxws.server.EndpointController.handleRequest(EndpointController.java:247)
at org.apache.axis2.jaxws.server.EndpointController.invoke(EndpointController.java:103)
at org.apache.axis2.jaxws.server.JAXWSMessageReceiver.receive(JAXWSMessageReceiver.java:161)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:189)
at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:275)
at com.ibm.ws.websvcs.transport.http.WASAxis2Servlet.doPost(WASAxis2Servlet.java:1431)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:738)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1663)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:939)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:502)
at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:181)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:91)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:864)
at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1592)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:186)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:452)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:511)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:305)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:276)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
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:1646)
org.apache.openjpa.persistence.PersistenceProviderImpl returned: java.lang.IllegalArgumentException: The jar resource "wam-1.0.0.jar" cannot be loaded.
at org.apache.openjpa.persistence.PersistenceUnitInfoImpl.validateJarFileName(PersistenceUnitInfoImpl.java:277)
at org.apache.openjpa.persistence.PersistenceUnitInfoImpl.processJarFileNames(PersistenceUnitInfoImpl.java:239)
at org.apache.openjpa.persistence.PersistenceProductDerivation.load(PersistenceProductDerivation.java:538)
at org.apache.openjpa.persistence.PersistenceProductDerivation.load(PersistenceProductDerivation.java:335)
at org.apache.openjpa.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:89)
at org.apache.openjpa.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:154)
at org.apache.openjpa.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:65)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:150)
at gov.ssa.wam.service.BaseWAMService.initializeEntityManagerFactory(BaseWAMService.java:73)
at gov.ssa.wam.service.BaseWAMService.<init>(BaseWAMService.java:34)
at gov.ssa.wam.service.WAMServiceDelegate.getInstance(WAMServiceDelegate.java:31)
at gov.ssa.earnings.webservice.WAMServiceBean.<init>(WAMServiceBean.java:22)
at java.lang.J9VMInternals.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1474)
at com.ibm.wsspi.injectionengine.InjectionUtil.createInjectedInstance(InjectionUtil.java:79)
at com.ibm.ws.websvcs.server.WSServiceInstanceFactory.createServiceInstance(WSServiceInstanceFactory.java:110)
at org.apache.axis2.jaxws.server.EndpointController.handleRequest(EndpointController.java:247)
at org.apache.axis2.jaxws.server.EndpointController.invoke(EndpointController.java:103)
at org.apache.axis2.jaxws.server.JAXWSMessageReceiver.receive(JAXWSMessageReceiver.java:161)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:189)
at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:275)
at com.ibm.ws.websvcs.transport.http.WASAxis2Servlet.doPost(WASAxis2Servlet.java:1431)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:738)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1663)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:939)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:502)
at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:181)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:91)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:864)
at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1592)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:186)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:452)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:511)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:305)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:276)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
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:1646)

wam-1.0.0.jar文件在ear库文件夹中。 似乎在wam-config.jar中找到了persistence.xml，但找不到（或无法使用）wam-1.0.0.jar。 有人知道我要去哪里错吗？

编辑：每个请求发布完整的堆栈跟踪。 对于那个很抱歉！

Answer 1

我想到了。 似乎找不到我的映射XML文件。

我开始通过“经典”方式进行实验-包括persistence.xml和我的带有持久化实体的jar中的映射XML文件。 那也不行。 然后，我将persistence.xml中映射文件的路径更改为“ META-INF / wamMapping.xml”，事情开始起作用！ 之后，我从jar文件中删除了persistence.xml和映射XML，并将它们放在META-INF目录内的另一个jar文件中。 然后，我将其放入我的耳朵库中。 还在工作！

我现在很难使战争中的其他持久化类正常工作，但这是另一个问题。