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java.lang.NullPointerException: 	at org.apache.myfaces.custom.tree2.HtmlTreeRenderer.encodeChildren(HtmlTreeRenderer.java:187)	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:329)	at javax.faces.webapp.UIComponentTag.encodeChildren(UIComponentTag.java:380)	at javax.faces.webapp.UIComponentTag.doEndTag(UIComponentTag.java:288)	at org.apache.jsp.home_jsp._jspx_meth_x_tree2_0(org.apache.jsp.home_jsp:219)	at org.apache.jsp.home_jsp._jspx_meth_f_view_0(org.apache.jsp.home_jsp:170)	at org.apache.jsp.home_jsp._jspService(org.apache.jsp.home_jsp:120)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:99)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:325)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:245)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:674)	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:465)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:400)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:303)	at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:405)	at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:280)	at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:300)	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:110)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)	at org.apache.myfaces.component.html.util.ExtensionsFilter.doFilter(ExtensionsFilter.java:112)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)	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:825)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:731)	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:526)	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)	at java.lang.Thread.run(Thread.java:595)