没有为Metamodel中的密钥类找到
实体：
@Entity @Table(name="user_account") public class UserAccount implements Serializable{ private static final long serialVersionUID = -2606506548742732094L; @Id @GeneratedValue(strategy=GenerationType.TABLE) private Integer id; persistence.xml中
false
错误
WARNING: #{accountController.performLogin}: java.lang.IllegalArgumentException: No [EntityType] was found for the key class [com.maze.model.UserAccount] in the Metamodel - please verify that the [Entity] class was referenced in persistence.xml using a specific com.maze.model.UserAccount property or a global false element. javax.faces.FacesException: #{accountController.performLogin}: java.lang.IllegalArgumentException: No [EntityType] was found for the key class [com.maze.model.UserAccount] in the Metamodel - please verify that the [Entity] class was referenced in persistence.xml using a specific com.maze.model.UserAccount property or a global false element. at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118) at javax.faces.component.UICommand.broadcast(UICommand.java:315) at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794) at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259) at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593) at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595) at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98) at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162) at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231) at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174) at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828) at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725) at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019) at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225) at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90) at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79) at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54) at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59) at com.sun.grizzly.ContextTask.run(ContextTask.java:71) at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532) at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513) at java.lang.Thread.run(Thread.java:662)
行为每次重新启动Web容器时，一切都可以正常运行几分钟，而且会抛出此错误。 我错过了什么？
编辑：
现在我也在应用程序范围上使用实体，并且Country Entity也会出现相同的错误。 User和Country都定义为persistance.xml中的类。 此外，exclude-unlisted-classes设置为false。
SEVERE: Critical error during deployment: java.lang.ExceptionInInitializerError at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39 ) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at java.lang.Class.newInstance0(Class.java:355) at java.lang.Class.newInstance(Class.java:308) at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:188) at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:102) at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:409) at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:269) at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:256) at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:255) at org.apache.catalina.core.StandardContext.contextListenerStart(StandardContext.java:4750) at com.sun.enterprise.web.WebModule.contextListenerStart(WebModule.java:550) at org.apache.catalina.core.StandardContext.start(StandardContext.java:5366) at com.sun.enterprise.web.WebModule.start(WebModule.java:498) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:917) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:901) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:733) at com.sun.enterprise.web.WebContainer.loadWebModule(WebContainer.java:2000) at com.sun.enterprise.web.WebContainer.loadWebModule(WebContainer.java:1651) at com.sun.enterprise.web.WebApplication.start(WebApplication.java:109) at org.glassfish.internal.data.EngineRef.start(EngineRef.java:130) at org.glassfish.internal.data.ModuleInfo.start(ModuleInfo.java:269) at org.glassfish.internal.data.ApplicationInfo.start(ApplicationInfo.java:294) at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:462) at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:240) at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:382) at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:355) at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:370) at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1064) at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1200(CommandRunnerImpl.java:96) at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1244) at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1232) at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:459) at com.sun.enterprise.v3.admin.AdminAdapter.service(AdminAdapter.java:209) at com.sun.grizzly.tcp.http11.GrizzlyAdapter.service(GrizzlyAdapter.java:168) at com.sun.enterprise.v3.server.HK2Dispatcher.dispath(HK2Dispatcher.java:117) at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:238) at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828) at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725) at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019) at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225) at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90) at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79) at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54) at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59) at com.sun.grizzly.ContextTask.run(ContextTask.java:71) at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532) at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513) at java.lang.Thread.run(Thread.java:662) Caused by: java.lang.IllegalArgumentException: No [EntityType] was found for the key class [com.maze.model.Country] in the Metamodel - please verify that the [Entity] class was referenced in persistence.xml using a specific com.maze.model.Country property or a global false element. at org.eclipse.persistence.internal.jpa.metamodel.MetamodelImpl.entityEmbeddableManagedTypeNotFound(MetamodelImpl.java:174) at org.eclipse.persistence.internal.jpa.metamodel.MetamodelImpl.entity(MetamodelImpl.java:194) at org.eclipse.persistence.internal.jpa.querydef.AbstractQueryImpl.from(AbstractQueryImpl.java:97) at com.maze.service.CountryService.readList(CountryService.java:74) at com.maze.util.MazeConstants.(MazeConstants.java:26)
国家实体：
@Entity @Table(name = "country") public class Country implements Serializable{ private static final long serialVersionUID = 4086034429815316972L; @Id private Integer id; private String name; private String continent; private Integer population; private Float surface; @OneToMany(mappedBy = "country") private List userList;
现在，该实体用于应用程序范围，并且实体抛出此错误，Glassfish无法完全启动。
第二次编辑：根据当前行为，似乎Web容器启动并正常工作，直到第一次热部署。
问题是您的应用程序的热部署。 旧的持久性单元在服务器中停留，因为您从未关闭旧工厂，因此在热部署之后，工厂仍然具有旧类，因此您将获得类转换错误。
你需要清除旧的持久性单元。 关闭EntityManagerFactory应该这样做，例如在Servlet销毁回调中。
如果您使用托管持久性单元，那么应该自动清理所有内容。 问题在于您如何管理持久性单元。
我认为EclipseLink上也有一个错误，你可能想投票给那个bug。
我曾经遇到过类似的问题。 有时抛出exception，有时不抛出。 经过一段时间的调试后，我发现它是由类路径上另一个jar中包含的第二个persistence.xml文件（包含一个具有相同名称的持久性单元）引起的。
您可以手动将类添加到persistence.xml吗？ 理想情况下，你不应该这样做，但它至少会给你一个开始。
我有一个类似的问题，我重构了代码，更改了类名，资源注入仍然试图注入旧的类名。 重命名我的持久性单元修复了问题（并随后恢复名称重新引入了问题）。
更新：进一步搜索后，我遇到了Persistence类的jar文件。 我创建它来解决以前的构建问题。 使问题更加复杂，我还重命名了我的项目。 虽然我已经从我的工作区中删除了持久性JAR，但它仍然悬挂在旧项目名称下的eclipse的.xxx文件夹中。 我删除了它以及对旧项目的所有引用，并修复了我的构建，删除了No [EntityType]消息。