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java.lang.NullPointerException: 	at org.apache.taglibs.standard.tlv.JstlBaseTLV.validate(JstlBaseTLV.java:178)	at org.apache.taglibs.standard.tlv.JstlCoreTLV.validate(JstlCoreTLV.java:134)	at org.apache.jasper.compiler.TagLibraryInfoImpl.validate(TagLibraryInfoImpl.java:913)	at org.apache.jasper.compiler.Validator.validateXmlView(Validator.java:1891)	at org.apache.jasper.compiler.Validator.validate(Validator.java:1859)	at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:210)	at org.apache.jasper.compiler.Compiler.compile(Compiler.java:435)	at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:608)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:360)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:486)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:380)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:743)	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:603)	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:542)	at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:1013)	at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:698)	at org.apache.tiles.jsp.context.JspTilesRequestContext.include(JspTilesRequestContext.java:103)	at org.apache.tiles.jsp.context.JspTilesRequestContext.dispatch(JspTilesRequestContext.java:96)	at org.apache.tiles.renderer.impl.TemplateAttributeRenderer.write(TemplateAttributeRenderer.java:44)	at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106)	at org.apache.tiles.renderer.impl.ChainedDelegateAttributeRenderer.write(ChainedDelegateAttributeRenderer.java:76)	at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106)	at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:670)	at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:336)	at org.apache.tiles.template.InsertAttributeModel.renderAttribute(InsertAttributeModel.java:210)	at org.apache.tiles.template.InsertAttributeModel.end(InsertAttributeModel.java:126)	at org.apache.tiles.jsp.taglib.InsertAttributeTag.doTag(InsertAttributeTag.java:311)	at org.apache.jsp.WEB_002dINF.jsp.layout.standard_005flayout_jsp._jspx_meth_tiles_insertAttribute_2(org.apache.jsp.WEB_002dINF.jsp.layout.standard_005flayout_jsp:449)	at org.apache.jsp.WEB_002dINF.jsp.layout.standard_005flayout_jsp._jspService(org.apache.jsp.WEB_002dINF.jsp.layout.standard_005flayout_jsp:185)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:109)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:389)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:486)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:380)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:743)	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:485)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:410)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:337)	at org.apache.tiles.servlet.context.ServletTilesRequestContext.forward(ServletTilesRequestContext.java:241)	at org.apache.tiles.servlet.context.ServletTilesRequestContext.dispatch(ServletTilesRequestContext.java:222)	at org.apache.tiles.renderer.impl.TemplateAttributeRenderer.write(TemplateAttributeRenderer.java:44)	at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106)	at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:670)	at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:690)	at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:644)	at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:627)	at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:321)	at org.springframework.web.servlet.view.tiles2.TilesView.renderMergedOutputModel(TilesView.java:124)	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262)	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1157)	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:927)	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827)	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:311)	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:116)	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:101)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)	at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:146)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:182)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:173)	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Thread.java:748)