我创建了一个非常简单的“企业应用程序”项目，其中包含大约7个实体bean和一个无状态会话bean。我还配置了一个Glassfish v3实例作为我的应用服务器运行。不幸的是，当我尝试将EAR发布到Glassfish时，我收到了以下回复：
SEVERE: Exception while invoking class org.glassfish.persistence.jpa.JPADeployer prepare method
java.lang.NullPointerException
at org.glassfish.persistence.jpa.JPADeployer.prepare(JPADeployer.java:104)
at com.sun.enterprise.v3.server.ApplicationLifecycle.prepareModule(ApplicationLifecycle.java:644)
at org.glassfish.javaee.full.deployment.EarDeployer.prepareBundle(EarDeployer.java:269)
at org.glassfish.javaee.full.deployment.EarDeployer.access$200(EarDeployer.java:79)
at org.glassfish.javaee.full.deployment.EarDeployer$1.doBundle(EarDeployer.java:131)
at org.glassfish.javaee.full.deployment.EarDeployer$1.doBundle(EarDeployer.java:129)
at org.glassfish.javaee.full.deployment.EarDeployer.doOnBundles(EarDeployer.java:197)
at org.glassfish.javaee.full.deployment.EarDeployer.doOnAllTypedBundles(EarDeployer.java:206)
at org.glassfish.javaee.full.deployment.EarDeployer.doOnAllBundles(EarDeployer.java:232)
at org.glassfish.javaee.full.deployment.EarDeployer.prepare(EarDeployer.java:129)
at com.sun.enterprise.v3.server.ApplicationLifecycle.prepareModule(ApplicationLifecycle.java:644)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:296)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:183)
at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:272)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:305)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:320)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1176)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$900(CommandRunnerImpl.java:83)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1235)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1224)
at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:365)
at com.sun.enterprise.v3.admin.AdminAdapter.service(AdminAdapter.java:204)
at com.sun.grizzly.tcp.http11.GrizzlyAdapter.service(GrizzlyAdapter.java:166)
at com.sun.enterprise.v3.server.HK2Dispatcher.dispath(HK2Dispatcher.java:100)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:245)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
at java.lang.Thread.run(Thread.java:637)