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java.lang.NullPointerException: 	at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:245)	at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:220)	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:122)	at org.jboss.ejb.plugins.jrmp.server.JRMPContainerInvoker_Stub.invoke(Unknown Source)	at org.jboss.ejb.plugins.jrmp.interfaces.GenericProxy.invokeContainer(GenericProxy.java:357)	at org.jboss.ejb.plugins.jrmp.interfaces.EntityProxy.invoke(EntityProxy.java:133)	at undefined.$Proxy1.getProductId(Unknown Source)	at edu.rmit.isys2049.s010100012753.ProductAccessBean.addDetailsToList(ProductAccessBean.java:530)	at edu.rmit.isys2049.s010100012753.ProductAccessBean.findAll(ProductAccessBean.java:368)	at org.apache.jsp.listProj1$jsp._jspService(listProj1$jsp.java:148)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:202)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:382)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:474)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:679)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:431)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:355)	at edu.rmit.isys2049.s010100012753.DispatcherServlet.doPost(DispatcherServlet.java:143)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:201)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)	at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)	at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2344)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)	at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:462)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:163)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)	at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1011)	at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1106)	at java.lang.Thread.run(Thread.java:484)