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我在装有jboss开发工作室的Eclipse IDE（Juno RE 2）中遇到问题。我有一些与JPA合作的Maven项目。在这些项目中，Eclipse报告错误“ 该项目具有JPA构面，但不能创建JPA项目。有关更多详细信息，请参阅错误日志。构建JPA项目期间的Eclipse AbstractMethodError
当我看到在工作区中的.metadata文件夹中的.log文件，我看到这个异常：
java.lang.AbstractMethodError: org.jboss.tools.hibernate.jpt.core.internal.jpa2.HibernateJpa2_0PlatformFactory.buildJpaPlatform(Lorg/eclipse/jpt/jpa/core/JpaPlatform$Config;)Lorg/eclipse/jpt/jpa/core/JpaPlatform;
at org.eclipse.jpt.jpa.core.internal.platform.InternalJpaPlatformConfig.buildJpaPlatform(InternalJpaPlatformConfig.java:109)
at org.eclipse.jpt.jpa.core.internal.platform.InternalJpaPlatformConfig.getJpaPlatform(InternalJpaPlatformConfig.java:102)
at org.eclipse.jpt.jpa.core.internal.platform.InternalJpaPlatformManager.getJpaPlatform(InternalJpaPlatformManager.java:288)
at org.eclipse.jpt.jpa.core.internal.InternalJpaProjectManager.getJpaPlatform(InternalJpaProjectManager.java:666)
at org.eclipse.jpt.jpa.core.internal.InternalJpaProjectManager.buildJpaProjectConfig(InternalJpaProjectManager.java:653)
at org.eclipse.jpt.jpa.core.internal.InternalJpaProjectManager.buildJpaProject(InternalJpaProjectManager.java:623)
at org.eclipse.jpt.jpa.core.internal.InternalJpaProjectManager.addJpaProject(InternalJpaProjectManager.java:604)
at org.eclipse.jpt.jpa.core.internal.InternalJpaProjectManager.buildJpaProject_(InternalJpaProjectManager.java:303)
at org.eclipse.jpt.jpa.core.internal.InternalJpaProjectManager$BuildJpaProjectCommand.execute(InternalJpaProjectManager.java:297)
at org.eclipse.jpt.common.core.internal.utility.command.CommandJobCommandAdapter.execute(CommandJobCommandAdapter.java:50)
at org.eclipse.jpt.common.core.internal.utility.command.JobCommandJob.run(JobCommandJob.java:42)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)
我真的无法找到此错误的原因。我也不能把头围住它。 任何形式的解释和或帮助将不胜感激。
编辑： 或者，当我告诉Maven来更新项目，我得到
java.lang.NoClassDefFoundError: org/eclipse/jpt/jpa/core/JpaFacet
at org.jboss.tools.maven.jpa.configurators.JpaProjectConfigurator.canConfigure(JpaProjectConfigurator.java:171)
at org.jboss.tools.maven.jpa.configurators.JpaProjectConfigurator.configure(JpaProjectConfigurator.java:73)
at org.eclipse.m2e.core.project.configurator.AbstractLifecycleMapping.configure(AbstractLifecycleMapping.java:109)
at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.updateProjectConfiguration(ProjectConfigurationManager.java:413)
at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.updateProjectConfiguration(ProjectConfigurationManager.java:350)
at org.eclipse.m2e.core.ui.internal.UpdateMavenProjectJob.runInWorkspace(UpdateMavenProjectJob.java:74)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)
