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Type: Bug
Resolution: Unresolved
Priority: Critical
Fix Version/s: None
Affects Version/s: 8.0.3
Component/s: None
Labels:
None
Environment:

apache-tomcat-8.0.24

Almost every day we can find in our application log these examples of the same problem

IMHO it is problem with lost ZK desktop after session timeout, when client tries to do some action in browser
for example i have a testcase:
- I have 2 browser tabs for the same application (different pages and desktops)
- in first tab I use a long operation action
- in second tab I use logout action
- the NullPointerException is thrown for the first tab since desktop is NULL

I am not able to find solution on the internet so I am asking here.

Examples:

2017-08-09T10:15:49,222 [/orionweb] [{user=mrz}] ERROR org.zkoss.zul.Grid-
java.lang.NullPointerException
	at org.zkoss.zk.ui.AbstractComponent.addMoved(AbstractComponent.java:483) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.AbstractComponent.setParent(AbstractComponent.java:1257) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zul.Grid$Renderer.render(Grid.java:1148) [zul-8.0.3.1.jar:?]
	at org.zkoss.zul.Grid.doInitRenderer(Grid.java:1020) [zul-8.0.3.1.jar:?]
	at org.zkoss.zul.Grid.onInitRender(Grid.java:977) [zul-8.0.3.1.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51]
	at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51]
	at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:3144) [zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:3075) [zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:138) [zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.UiEngineImpl.processEvent(UiEngineImpl.java:1853) [zk-8.0.3.1.jar:?]

2017-08-09T10:15:50,213 [/orionweb] [{user=mrz}] ERROR org.zkoss.zk.ui.impl.UiEngineImpl-
java.lang.NullPointerException
	at org.zkoss.zk.ui.AbstractComponent.getAttachedUiEngine(AbstractComponent.java:376) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.AbstractComponent.smartUpdate(AbstractComponent.java:1844) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.AbstractComponent.smartUpdate(AbstractComponent.java:1818) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.AbstractComponent.smartUpdate(AbstractComponent.java:1884) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zul.Row.setLoaded(Row.java:181) ~[zul-8.0.3.1.jar:?]
	at org.zkoss.zul.Grid$Renderer.render(Grid.java:1152) ~[zul-8.0.3.1.jar:?]
	at org.zkoss.zul.Grid.doInitRenderer(Grid.java:1020) ~[zul-8.0.3.1.jar:?]
	at org.zkoss.zul.Grid.onInitRender(Grid.java:977) ~[zul-8.0.3.1.jar:?]

2016-11-01T10:02:11,294 [] [{}] [http-nio-8102-exec-41] ERROR Fatal- 
java.lang.NullPointerException
	at org.zkoss.zk.ui.AbstractComponent.addMoved(AbstractComponent.java:483) ~[zk-8.0.2.1.jar:?]
	at org.zkoss.zk.ui.AbstractComponent.setParent(AbstractComponent.java:1257) ~[zk-8.0.2.1.jar:?]
	at org.zkoss.zk.ui.AbstractComponent.insertBefore(AbstractComponent.java:1356) ~[zk-8.0.2.1.jar:?]
	at org.zkoss.zk.ui.AbstractComponent.appendChild(AbstractComponent.java:1534) ~[zk-8.0.2.1.jar:?]
	at cz.ccv.orionweb.composers.general.DashboardComposer.addDocumentButton(DashboardComposer.java:468) ~[DashboardComposer.class:?]
	at cz.ccv.orionweb.composers.general.DashboardComposer.addDocumentButton(DashboardComposer.java:490) ~[DashboardComposer.class:?]
	at cz.ccv.orionweb.composers.general.DashboardComposer.fillWaitingForResolved(DashboardComposer.java:221) ~[DashboardComposer.class:?]
	at cz.ccv.orionweb.composers.general.DashboardComposer.doAfterCompose(DashboardComposer.java:105) ~[DashboardComposer.class:?]

2016-11-01T10:02:11,327 [/orionweb] [{user=kraftcs}] [http-nio-8102-exec-41] ERROR org.zkoss.zk.ui.impl.UiEngineImpl- 
java.lang.NullPointerException
	at org.zkoss.zk.ui.AbstractComponent.redraw(AbstractComponent.java:2156) ~[zk-8.0.2.1.jar:?]
	at org.zkoss.zk.ui.impl.UiVisualizer.redraw(UiVisualizer.java:1003) ~[zk-8.0.2.1.jar:?]
	at org.zkoss.zk.ui.impl.UiVisualizer.getResponses(UiVisualizer.java:699) ~[zk-8.0.2.1.jar:?]
	at org.zkoss.zk.ui.impl.UiEngineImpl.getResponses(UiEngineImpl.java:1538) [zk-8.0.2.1.jar:?]
	at org.zkoss.zk.ui.impl.UiEngineImpl.execUpdate(UiEngineImpl.java:1344) [zk-8.0.2.1.jar:?]
	at org.zkoss.zk.au.http.DHtmlUpdateServlet.process(DHtmlUpdateServlet.java:606) [zk-8.0.2.1.jar:8.0.2.1]
	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:482) [zk-8.0.2.1.jar:8.0.2.1]
	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:490) [zk-8.0.2.1.jar:8.0.2.1]

2017-05-18T09:15:38,848 [/orionweb] [{user=gstobchod}] [http-nio-8102-exec-76] ERROR org.zkoss.zk.ui.impl.UiEngineImpl- 
java.lang.NullPointerException
	at org.zkoss.zk.ui.AbstractComponent.redraw(AbstractComponent.java:2156) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.UiVisualizer.redraw(UiVisualizer.java:1003) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.UiVisualizer.getResponses(UiVisualizer.java:699) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.UiEngineImpl.getResponses(UiEngineImpl.java:1538) [zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.UiEngineImpl.execUpdate(UiEngineImpl.java:1344) [zk-8.0.3.1.jar:?]
	at org.zkoss.zk.au.http.DHtmlUpdateServlet.process(DHtmlUpdateServlet.java:606) [zk-8.0.3.1.jar:8.0.3.1]
	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:482) [zk-8.0.3.1.jar:8.0.3.1]
	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:490) [zk-8.0.3.1.jar:8.0.3.1]

2017-08-07T15:53:54,576 [/orionadmin] [{user=mrz}] ERROR org.zkoss.zk.ui.impl.UiEngineImpl- Unable to generate custom error page, /WEB-INF/zk/unsecure/exception/error.zul
java.lang.NullPointerException
	at org.zkoss.zk.ui.AbstractComponent.addMoved(AbstractComponent.java:483) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.AbstractComponent.setPageBefore(AbstractComponent.java:432) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.AbstractUiFactory.newComponent(AbstractUiFactory.java:142) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:925) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:895) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:777) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:841) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:797) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:740) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.UiEngineImpl.createComponents(UiEngineImpl.java:1150) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.AbstractExecution.createComponents0(AbstractExecution.java:346) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.AbstractExecution.createComponents(AbstractExecution.java:307) ~[zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.UiEngineImpl.visualizeErrors(UiEngineImpl.java:1581) [zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.UiEngineImpl.getResponses(UiEngineImpl.java:1535) [zk-8.0.3.1.jar:?]
	at org.zkoss.zk.ui.impl.UiEngineImpl.execUpdate(UiEngineImpl.java:1344) [zk-8.0.3.1.jar:?]
	at org.zkoss.zk.au.http.DHtmlUpdateServlet.process(DHtmlUpdateServlet.java:606) [zk-8.0.3.1.jar:8.0.3.1]
	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:482) [zk-8.0.3.1.jar:8.0.3.1]
	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:490) [zk-8.0.3.1.jar:8.0.3.1]

Assignee:: Unassigned

Reporter:: Worsik

Votes:: 1 Vote for this issue

Watchers:: 2 Start watching this issue

Created:: 22/Aug/17 2:03 PM

Updated:: 21/Sep/18 6:32 AM

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