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org.hibernate.AnnotationException: mappedBy reference an unknown target entity property:
notWorking.ExcludedGroupUser.user in notWorking.User.excludedUsers	at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:576)	at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:541)	at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:43)	at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1140)	at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:319)	at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1125)	at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1269)	at org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:150)	at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:888)	at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:186)	at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:246)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.hibernate.tool.ant.JPAConfigurationTask.createConfiguration(JPAConfigurationTask.java:43)	at org.hibernate.tool.ant.ConfigurationTask.getConfiguration(ConfigurationTask.java:54)	at org.hibernate.tool.ant.HibernateToolTask.getConfiguration(HibernateToolTask.java:302)	at org.hibernate.tool.ant.Hbm2DDLExporterTask.execute(Hbm2DDLExporterTask.java:45)	at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.java:186)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at org.apache.tools.ant.Target.execute(Target.java:341)	at org.apache.tools.ant.Target.performTasks(Target.java:369)	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)	at org.apache.tools.ant.Project.executeTarget(Project.java:1185)	at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)	at org.apache.tools.ant.Project.executeTargets(Project.java:1068)	at org.apache.tools.ant.Main.runBuild(Main.java:668)	at org.apache.tools.ant.Main.startAnt(Main.java:187)	at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)	at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)