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java.lang.NullPointerException: 	at org.apache.tiles.impl.mgmt.CachingTilesContainer.getDefinitions(CachingTilesContainer.java:183)	at org.apache.tiles.impl.mgmt.CachingTilesContainer.getCustomDefinition(CachingTilesContainer.java:236)	at org.apache.tiles.impl.mgmt.CachingTilesContainer.isValidDefinition(CachingTilesContainer.java:97)	at org.apache.tiles.renderer.DefinitionRenderer.isRenderable(DefinitionRenderer.java:64)	at org.springframework.web.servlet.view.tiles3.TilesView.checkResource(TilesView.java:104)	at org.springframework.web.servlet.view.UrlBasedViewResolver.loadView(UrlBasedViewResolver.java:438)	at org.springframework.web.servlet.view.AbstractCachingViewResolver.createView(AbstractCachingViewResolver.java:212)	at org.springframework.web.servlet.view.UrlBasedViewResolver.createView(UrlBasedViewResolver.java:401)	at org.springframework.web.servlet.view.AbstractCachingViewResolver.resolveViewName(AbstractCachingViewResolver.java:129)	at org.springframework.web.servlet.DispatcherServlet.resolveViewName(DispatcherServlet.java:1239)	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1188)	at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:992)	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:939)	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:920)	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:816)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:801)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:669)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1336)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:183)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:183)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:125)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1307)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:453)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:560)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1072)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:382)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1006)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)	at org.eclipse.jetty.server.Server.handle(Server.java:365)	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:485)	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:926)	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:988)	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:635)	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:628)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)	at java.lang.Thread.run(Thread.java:722)