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java.lang.IllegalArgumentException: Object: model.Customer@4b4638 is not a known Entity type.	at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.registerNewObjectForPersist(UnitOfWorkImpl.java:4226)	at org.eclipse.persistence.internal.jpa.EntityManagerImpl.persist(EntityManagerImpl.java:507)	at com.sun.enterprise.container.common.impl.EntityManagerWrapper.persist(EntityManagerWrapper.java:287)	at controllers.CustomerController.save(CustomerController.java:57)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at javax.el.ELUtil.invokeMethod(ELUtil.java:332)	at javax.el.BeanELResolver.invoke(BeanELResolver.java:537)	at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:256)	at com.sun.el.parser.AstValue.invoke(AstValue.java:283)	at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)	at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)	at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)	at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)	at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)	at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)	at javax.faces.component.UICommand.broadcast(UICommand.java:315)	at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)	at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)	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:198)	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)	at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:416)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:283)	at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)	at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)	at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)	at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)	at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:283)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132)	at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111)	at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)	at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)	at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)	at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)	at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)	at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)	at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591)	at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)	at java.lang.Thread.run(Unknown Source)