javax.faces.FacesException: Error calling action method of component with id _id6:_id31

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javax.faces.el.EvaluationException: /login.xhtml @33,97 action="#{identity.login}": java.lang.NullPointerException:	at com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:73)	at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:61)	at javax.faces.component.UICommand.broadcast(UICommand.java:109)	at javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:97)	at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:171)	at org.apache.myfaces.lifecycle.InvokeApplicationExecutor.execute(InvokeApplicationExecutor.java:32)	at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:95)	at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:70)	at com.icesoft.faces.webapp.xmlhttp.BlockingServlet.renderCycle(BlockingServlet.java:456)	at com.icesoft.faces.webapp.xmlhttp.BlockingServlet.receiveUpdates(BlockingServlet.java:444)	at com.icesoft.faces.webapp.xmlhttp.BlockingServlet.executeRequest(BlockingServlet.java:314)	at com.icesoft.faces.webapp.xmlhttp.BlockingServlet.service(BlockingServlet.java:186)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)	at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)	at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)	at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)	at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)	at java.lang.Thread.run(Thread.java:595)