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getSingleResult() did not retrieve any entities.
javax.persistence.NoResultException: getSingleResult() did not retrieve any entities.	at oracle.toplink.essentials.internal.ejb.cmp3.EJBQueryImpl.throwNoResultException(EJBQueryImpl.java:223)	at oracle.toplink.essentials.internal.ejb.cmp3.base.EJBQueryImpl.getSingleResult(EJBQueryImpl.java:475)	at com.utc.hs.ear.facade.EarFacadeBean.getAr(EarFacadeBean.java:37)	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 com.sun.enterprise.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1050)	at com.sun.enterprise.security.SecurityUtil.invoke(SecurityUtil.java:165)	at com.sun.ejb.containers.BaseContainer.invokeTargetBeanMethod(BaseContainer.java:2766)	at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:3847)	at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:184)	at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:118)	at $Proxy53.getAr(Unknown Source)	at com.utc.hs.ear.controller.EarManager.loadEar(EarManager.java:63)	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 com.sun.el.parser.AstValue.invoke(AstValue.java:151)	at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:283)	at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:77)	at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:96)	at javax.faces.component.UICommand.broadcast(UICommand.java:383)	at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:450)	at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:759)	at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:97)	at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:244)	at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:113)	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)	at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:397)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:278)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)	at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:240)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:179)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:182)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)	at com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:137)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)	at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:239)	at com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667)	at com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574)	at com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844)	at com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287)	at com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212)	at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252)	at com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75)