Eclipselink錯誤3002

我按照說明here（特別是任務3和4）從Toplink 10g到本地Eclipselink v2.6.4進行簡單遷移。一切都編譯好，但是當我嘗試運行我的應用程序時，我得到下面的錯誤。Eclipselink錯誤3002

我嘗試使用舊的映射文件（它仍然兼容）以及從Eclipselink工作臺通過導入我的舊Toplink工作臺項目生成的新映射文件。

請注意，我只從Toplink遷移到本地Eclispelink。沒有涉及JPA。

有什麼想法是什麼錯？它似乎試圖不正確地使用String而不是我的實際類，但不確定。

此外，我的應用程序從來沒有一個persistence.xml文件。我現在需要一個嗎？

2017-02-20 14:55:52 ERROR - Presentation - Local Exception Stack: 
Exception [EclipseLink-3002] (Eclipse Persistence Services - 2.6.4.v20160829-44060b6): org.eclipse.persistence.exceptions.ConversionException 
Exception Description: The object [ca.ncams.wisor.refdata.AccessTandem], of class [class java.lang.String], from mapping [org.eclipse.persistence.oxm.mappings.XMLDirectMapping[javaClass-->class/text()]] with descriptor [XMLDescriptor(org.eclipse.persistence.descriptors.ClassDescriptor --> [DatabaseTable(class-mapping-descriptor)])], could not be converted to [class java.lang.Class]. 
Internal Exception: java.lang.ClassNotFoundException: ca.ncams.wisor.refdata.AccessTandem 
       at org.eclipse.persistence.exceptions.ConversionException.couldNotBeConvertedToClass(ConversionException.java:98) 
       at org.eclipse.persistence.internal.helper.ConversionManager.convertObjectToClass(ConversionManager.java:451) 
       at org.eclipse.persistence.internal.helper.ConversionManager.convertObject(ConversionManager.java:146) 
       at org.eclipse.persistence.internal.oxm.XMLConversionManager.convertObject(XMLConversionManager.java:197) 
       at org.eclipse.persistence.internal.databaseaccess.DatasourcePlatform.convertObject(DatasourcePlatform.java:179) 
       at org.eclipse.persistence.oxm.mappings.XMLDirectMapping.getAttributeValue(XMLDirectMapping.java:301) 
       at org.eclipse.persistence.oxm.mappings.XMLDirectMapping.valueFromRow(XMLDirectMapping.java:364) 
       at org.eclipse.persistence.mappings.DatabaseMapping.readFromRowIntoObject(DatabaseMapping.java:1539) 
       at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildAttributesIntoObject(ObjectBuilder.java:462) 
       at org.eclipse.persistence.internal.oxm.XMLObjectBuilder.buildAttributesIntoObject(XMLObjectBuilder.java:378) 
       at org.eclipse.persistence.internal.oxm.XMLObjectBuilder.buildObject(XMLObjectBuilder.java:291) 
       at org.eclipse.persistence.oxm.mappings.XMLCompositeCollectionMapping.buildCompositeObject(XMLCompositeCollectionMapping.java:380) 
       at org.eclipse.persistence.oxm.mappings.XMLCompositeCollectionMapping.buildObjectFromNestedRow(XMLCompositeCollectionMapping.java:587) 
       at org.eclipse.persistence.oxm.mappings.XMLCompositeCollectionMapping.valueFromRow(XMLCompositeCollectionMapping.java:511) 
       at org.eclipse.persistence.mappings.DatabaseMapping.readFromRowIntoObject(DatabaseMapping.java:1539) 
       at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildAttributesIntoObject(ObjectBuilder.java:462) 
       at org.eclipse.persistence.internal.oxm.XMLObjectBuilder.buildAttributesIntoObject(XMLObjectBuilder.java:378) 
       at org.eclipse.persistence.internal.oxm.XMLObjectBuilder.buildObject(XMLObjectBuilder.java:291) 
       at org.eclipse.persistence.internal.oxm.record.DOMUnmarshaller.xmlToObject(DOMUnmarshaller.java:469) 
       at org.eclipse.persistence.internal.oxm.record.DOMUnmarshaller.unmarshal(DOMUnmarshaller.java:267) 
       at org.eclipse.persistence.internal.oxm.record.DOMUnmarshaller.unmarshal(DOMUnmarshaller.java:246) 
       at org.eclipse.persistence.internal.oxm.XMLUnmarshaller.unmarshal(XMLUnmarshaller.java:530) 
       at org.eclipse.persistence.sessions.factories.XMLProjectReader.readObjectPersistenceRuntimeFormat(XMLProjectReader.java:293) 
       at org.eclipse.persistence.sessions.factories.XMLProjectReader.read(XMLProjectReader.java:186) 
       at org.eclipse.persistence.sessions.factories.XMLProjectReader.read(XMLProjectReader.java:242) 
       at org.eclipse.persistence.sessions.factories.XMLProjectReader.read(XMLProjectReader.java:100) 
       at ca.ncams.wisor.persistence.toplink.PersistenceManager.initializeTopLink(PersistenceManager.java:491) 
       at ca.ncams.wisor.persistence.toplink.PersistenceManager.<init>(PersistenceManager.java:83) 
       at ca.ncams.wisor.persistence.toplink.PersistenceManager.getInstance(PersistenceManager.java:96) 
       at ca.ncams.wisor.persistence.toplink.AutoRollbackFilter.doFilter(AutoRollbackFilter.java:57) 
       at ca.ncams.wisor.filter.FilterChainImpl.doFilter(FilterChainImpl.java:124) 
       at ca.ncams.wisor.presentation.filters.CatchAllFilter.doFilter(CatchAllFilter.java:60) 
       at ca.ncams.wisor.filter.FilterChainImpl.doFilter(FilterChainImpl.java:124) 
       at ca.ncams.wisor.presentation.filters.NoCacheFilter.doFilter(NoCacheFilter.java:47) 
       at ca.ncams.wisor.filter.FilterChainImpl.doFilter(FilterChainImpl.java:124) 
       at ca.ncams.wisor.filter.FilterJspBase.service(FilterJspBase.java:111) 
       at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:286) 
       at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:260) 
       at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:137) 
       at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:350) 
       at weblogic.servlet.internal.ServletStubImpl.onAddToMapException(ServletStubImpl.java:489) 
       at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:376) 
       at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:247) 
       at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3679) 
       at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.__run(WebAppServletContext.java:3649) 
       at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java) 
       at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:326) 
       at weblogic.security.service.SecurityManager.runAsForUserCode(SecurityManager.java:197) 
       at weblogic.servlet.provider.WlsSecurityProvider.runAsForUserCode(WlsSecurityProvider.java:203) 
       at weblogic.servlet.provider.WlsSubjectHandle.run(WlsSubjectHandle.java:71) 
       at weblogic.servlet.internal.WebAppServletContext.doSecuredExecute(WebAppServletContext.java:2433) 
       at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2281) 
       at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2259) 
       at weblogic.servlet.internal.ServletRequestImpl.runInternal(ServletRequestImpl.java:1691) 
       at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1651) 
       at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:270) 
       at weblogic.invocation.ComponentInvocationContextManager._runAs(ComponentInvocationContextManager.java:348) 
       at weblogic.invocation.ComponentInvocationContextManager.runAs(ComponentInvocationContextManager.java:333) 
       at weblogic.work.LivePartitionUtility.doRunWorkUnderContext(LivePartitionUtility.java:54) 
       at weblogic.work.PartitionUtility.runWorkUnderContext(PartitionUtility.java:41) 
       at weblogic.work.SelfTuningWorkManagerImpl.runWorkUnderContext(SelfTuningWorkManagerImpl.java:640) 
       at weblogic.work.ExecuteThread.execute(ExecuteThread.java:406) 
       at weblogic.work.ExecuteThread.run(ExecuteThread.java:346) 
Caused by: java.lang.ClassNotFoundException: ca.ncams.wisor.refdata.AccessTandem 
       at java.net.URLClassLoader.findClass(URLClassLoader.java:381) 
       at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 
       at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) 
       at java.lang.ClassLoader.loadClass(ClassLoader.java:357) 
       at java.lang.Class.forName0(Native Method) 
       at java.lang.Class.forName(Class.java:348) 
       at org.eclipse.persistence.internal.helper.ConversionManager.convertObjectToClass(ConversionManager.java:448) 
       ... 61 more

來源

2017-02-21 Graham Stephenson

問題發生是因爲您的映射文件包含「ca.ncams.wisor.refdata.AccessTandem」引用，並且要加載項目，需要將其轉換爲類但不能，因爲您沒有ca .cams.wisor.refdata.AccessTandem文件放在項目的類路徑中。 – Chris

舊的和新的映射文件都包含完整的軟件包名稱。它可以通過Toplink而不是EL工作正常。文件ca.ncams.wisor。*是我的應用程序中的類，所以它們肯定存在。不過，我想知道如果加載類的順序現在是不同的。在舊系統中，所有內容都位於WEB-INF/lib目錄中，但現在EclipseLink位於容器中。這會有所作爲嗎？有沒有辦法改變訂單？ –

您是否將具有您的ca.ncams.wisor。*類的類加載器傳遞給XMLProjectReader？無論使用哪種加載器，都無法找到導致異常的指定ca.ncams.wisor.refdata.AccessTandem類。 – Chris

這裏是我落得這樣做：

添加的EclipseLink 2.6.4依賴於POM（編譯，而不是提供）
添加到weblogic.xml中：

<wls:container-descriptor> 
    <wls:prefer-application-packages> 
     <wls:package-name>org.eclipse.persistence</wls:package-name> 
    </wls:prefer-application-packages> 
</wls:container-descriptor>

現在Eclipse鏈接找到我的課程並啓動。

請注意，我的代碼只傳入映射文件，而不是類加載器XMLProjectReader.read();，所以我想使用默認的類加載器。

如果有人知道如何通過類加載器，我仍然很想知道（我從哪裏得到它？）。

來源

2017-02-24 02:54:50

Eclipselink錯誤3002

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