This just happens. If the application / browser has been idling for few minutes the thing below gets logged to server log and in UI there’s red “Internal error” displayed. ItMill 5.3.1 running in Liferay 5.2.2 / JBoss AS 5.0.
10:08:10,411 ERROR [SspZoneMainApp]
Caught terminal error com.itmill.toolkit.terminal.gwt.server.ApplicationServlet$RequestError@3885826d, java.lang.NullPointerException
java.lang.NullPointerException
at com.itmill.toolkit.ui.Table.paintContent(Table.java:1849)
at com.itmill.toolkit.ui.AbstractComponent.paint(AbstractComponent.java:660)
at com.itmill.toolkit.terminal.gwt.server.CommunicationManager.paintAfterVariablechanges(CommunicationManager.java:457)
at com.itmill.toolkit.terminal.gwt.server.CommunicationManager.handleUidlRequest(CommunicationManager.java:311)
at com.itmill.toolkit.terminal.gwt.server.ApplicationServlet.service(ApplicationServlet.java:445)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:601)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
10:08:10,431 ERROR [STDERR]
java.lang.NullPointerException
10:08:10,431 ERROR [STDERR]
at com.itmill.toolkit.ui.Table.paintContent(Table.java:1849)
10:08:10,431 ERROR [STDERR]
at com.itmill.toolkit.ui.AbstractComponent.paint(AbstractComponent.java:660)
10:08:10,431 ERROR [STDERR]
at com.itmill.toolkit.terminal.gwt.server.CommunicationManager.paintAfterVariablechanges(CommunicationManager.java:457)
10:08:10,431 ERROR [STDERR]
at com.itmill.toolkit.terminal.gwt.server.CommunicationManager.handleUidlRequest(CommunicationManager.java:311)
10:08:10,431 ERROR [STDERR]
at com.itmill.toolkit.terminal.gwt.server.ApplicationServlet.service(ApplicationServlet.java:445)
10:08:10,431 ERROR [STDERR]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
10:08:10,431 ERROR [STDERR]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
10:08:10,431 ERROR [STDERR]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
10:08:10,431 ERROR [STDERR]
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
10:08:10,431 ERROR [STDERR]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
10:08:10,431 ERROR [STDERR]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
10:08:10,431 ERROR [STDERR]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
10:08:10,431 ERROR [STDERR]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
10:08:10,431 ERROR [STDERR]
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
10:08:10,431 ERROR [STDERR]
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
10:08:10,431 ERROR [STDERR]
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
10:08:10,432 ERROR [STDERR]
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
10:08:10,432 ERROR [STDERR]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
10:08:10,432 ERROR [STDERR]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
10:08:10,432 ERROR [STDERR]
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
10:08:10,432 ERROR [STDERR]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
10:08:10,432 ERROR [STDERR]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
10:08:10,432 ERROR [STDERR]
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828)
10:08:10,432 ERROR [STDERR]
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:601)
10:08:10,432 ERROR [STDERR]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
10:08:10,432 ERROR [STDERR]
at java.lang.Thread.run(Thread.java:619)