我正在尝试在处女座上运行 iDempiere。我加载了多个包没有问题。和加载正常org.adempiere.server。org.idempiere.webservices但是在加载org.adempiere.ui.zk捆绑包时，我NoClassDefFoundError在org.adempiere.base捆绑包中得到了一个。基本包在加载时没有引起任何问题org.adempiere.server，它也需要它。
奇怪的是，javax.print.attribute.standard.MediaSize$NA找不到的类是标准的Java类。
当执行时clexport，该类被导出。org.eclipse.osgi
当执行时clload，该类可以被其他包加载。
错误堆栈：
[2012-10-24 20:34:23.592] INFO fs-watcher o.e.virgo.kernel.deployer.hot.HotDeploymentFileSystemListener ApplicationConditionallyDeploying path 'D:\VIRGO-~1.REL\pickup\org.adempiere.ui.zk_1.0.0.v20121024-1809\'.
[2012-10-24 20:34:23.777] INFO start-signalling-1 org.compiere.web.AdempiereMonitorFilter
[2012-10-24 20:34:23.809] ERROR start-signalling-1 o.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/] StandardWrapper.Throwable java.lang.NoClassDefFoundError: javax/print/attribute/standard/MediaSize$NA
at org.compiere.util.Language.<clinit>(Language.java:101)
at org.compiere.util.Ini.<clinit>(Ini.java:85)
at org.compiere.util.WebEnv.initWeb(WebEnv.java:162)
at org.compiere.util.WebEnv.initWeb(WebEnv.java:129)
at org.compiere.web.AdempiereMonitor.init(AdempiereMonitor.java:1049)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1266)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1185)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1080)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5015)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5302)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:895)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:871)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:615)
at org.eclipse.gemini.web.tomcat.internal.TomcatServletContainer.startWebApplication(TomcatServletContainer.java:125)
at org.eclipse.gemini.web.internal.StandardWebApplication.start(StandardWebApplication.java:95)
at org.eclipse.virgo.web.core.internal.WebBundleLifecycleListener.onStarted(WebBundleLifecycleListener.java:122)
at org.eclipse.virgo.kernel.install.artifact.internal.StandardArtifactStateMonitor.onStarted(StandardArtifactStateMonitor.java:271)
at org.eclipse.virgo.kernel.install.artifact.internal.AbstractInstallArtifact.asyncStartSucceeded(AbstractInstallArtifact.java:319)
at org.eclipse.virgo.kernel.install.artifact.internal.AbstractInstallArtifact.access$0(AbstractInstallArtifact.java:316)
at org.eclipse.virgo.kernel.install.artifact.internal.AbstractInstallArtifact$StateMonitorSignal.signalSuccessfulCompletion(AbstractInstallArtifact.java:252)
at org.eclipse.virgo.kernel.core.internal.BundleStartTracker$1.run(BundleStartTracker.java:140)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: org.eclipse.virgo.kernel.osgi.framework.ExtendedClassNotFoundException: javax.print.attribute.standard.MediaSize$NA in KernelBundleClassLoader: [bundle=org.adempiere.base_1.0.0.v20121024-1809]
at org.eclipse.virgo.kernel.userregion.internal.equinox.KernelBundleClassLoader.loadClass(KernelBundleClassLoader.java:139)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
... 25 common frames omitted
Caused by: java.lang.ClassNotFoundException: javax.print.attribute.standard.MediaSize$NA
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:501)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at org.eclipse.virgo.kernel.userregion.internal.equinox.KernelBundleClassLoader.loadClass(KernelBundleClassLoader.java:135)
... 26 common frames omitted
知道是什么原因造成的吗？