NullPointerException when rendering portlet in method UIPortlet.getSuitedTheme() -------------------------------------------------------------------------------- Key: GTNPORTAL-3156 URL: https://issues.jboss.org/browse/GTNPORTAL-3156 Project: GateIn Portal Issue Type: Feature Request Security Level: Public(Everyone can see) Components: Common integration, WebUI Affects Versions: 3.5.3.Final Environment: RHEL 5.9 64bits, Oracle/Sun jdk 1.7.0 Reporter: Regis Mazur Priority: Minor Fix For: 3.7.0.Final During rendering of portal page an NPE error occurred when the portlet uicomponent try to retrieve theme (UIPortlet.getSuitedTheme() method). It can sometimes be reproduced when there are concurrent navigation requests (click around on the nav menu without waiting for a response). After investigation, it seems that the uicomponent tree is broken in this case and UIPortalApplication (null in this case) cannot be retrieve via the getAncestorOfType(UIPortalApplication.class) method. If you look at the content of uicomponent tree (see the "Expected results" and "Actual results"), you will see that standard portal uicomponent(UIPageBody,UIPortal,UISiteBody,UIViewWS,UIWorkingWorkspace,UIPortalApplication) are not in the tree. We reproduced the case in dev environment when there are concurrent navigation requests (click around around the nav menu without waiting for a response). It seems to be a concurrency issue in the portal itself. For the moment we fix the NPE in the UIPortlet.gtmpl (By retrieving the UIPortalApplication from the RequestContext instead of parsing the full uicomponent tree) but we don't fix the root cause and the possible side effects. Version-Release number of selected component (if applicable): GateIn 3.5.2.Final-redhat-4 How reproducible: Not always. Mostly while testing within customer test environment where deployed portlets model is more significant in term of size and complexity. Steps to Reproduce: Actually we tried but we can't reproduce it locally using JSF2.1 Quickstart portlet calling same portlet tree. This only happens when using "full" application which has a lot of other dependencies. 1. 2. 3. Actual results: 16:33:10,614 INFO [stdout] (http-localhost/127.0.0.1:8080-5) Looking for UIPortalApplication parent 16:33:10,614 INFO [stdout] (http-localhost/127.0.0.1:8080-5) parent : null - id : queries 16:33:10,614 INFO [stdout] (http-localhost/127.0.0.1:8080-5) parent : null - id : row1 16:33:10,614 INFO [stdout] (http-localhost/127.0.0.1:8080-5) parent : pp_portal_Dashboard - id : pp_portal_Dashboard 16:33:10,614 INFO [stdout] (http-localhost/127.0.0.1:8080-5) parent : pp_portal_Dashboard - id : 22572705 16:34:11,868 INFO [stdout] (http-localhost/127.0.0.1:8080-5) Looking for UIPortalApplication parent 16:34:11,868 INFO [stdout] (http-localhost/127.0.0.1:8080-5) parent : null - id : activities 16:34:11,868 INFO [stdout] (http-localhost/127.0.0.1:8080-5) parent : null - id : row2 16:34:11,868 INFO [stdout] (http-localhost/127.0.0.1:8080-5) parent : pp_portal_Dashboard - id : pp_portal_Dashboard 16:34:11,868 INFO [stdout] (http-localhost/127.0.0.1:8080-5) parent : pp_portal_Dashboard - id : 22572705 16:34:28,807 INFO [stdout] (http-localhost/127.0.0.1:8080-5) Looking for UIPortalApplication parent 16:34:28,807 INFO [stdout] (http-localhost/127.0.0.1:8080-5) parent : null - id : news 16:34:28,807 INFO [stdout] (http-localhost/127.0.0.1:8080-5) parent : null - id : row2 16:34:28,807 INFO [stdout] (http-localhost/127.0.0.1:8080-5) parent : pp_portal_Dashboard - id : pp_portal_Dashboard 16:34:28,807 INFO [stdout] (http-localhost/127.0.0.1:8080-5) parent : pp_portal_Dashboard - id : 22572705 Expected results: 16:32:56,597 INFO [stdout] (http-localhost/127.0.0.1:8080-3) Looking for UIPortalApplication parent 16:32:56,597 INFO [stdout] (http-localhost/127.0.0.1:8080-3) parent : null - id : tasks 16:32:56,597 INFO [stdout] (http-localhost/127.0.0.1:8080-3) parent : null - id : row1 16:32:56,597 INFO [stdout] (http-localhost/127.0.0.1:8080-3) parent : pp_portal_Dashboard - id : pp_portal_Dashboard 16:32:56,597 INFO [stdout] (http-localhost/127.0.0.1:8080-3) parent : pp_portal_Dashboard - id : 22572705 16:32:56,597 INFO [stdout] (http-localhost/127.0.0.1:8080-3) parent : UIPageBody - id : UIPageBody 16:32:56,597 INFO [stdout] (http-localhost/127.0.0.1:8080-3) parent : clearstream - id : UIPortal 16:32:56,597 INFO [stdout] (http-localhost/127.0.0.1:8080-3) parent : UISiteBody - id : UISiteBody 16:32:56,597 INFO [stdout] (http-localhost/127.0.0.1:8080-3) parent : null - id : 17689309 16:32:56,598 INFO [stdout] (http-localhost/127.0.0.1:8080-3) parent : UIComponentDecorator - id : UIViewWS 16:32:56,598 INFO [stdout] (http-localhost/127.0.0.1:8080-3) parent : UIWorkingWorkspace - id : UIWorkingWorkspace 16:32:56,598 INFO [stdout] (http-localhost/127.0.0.1:8080-3) parent : UIPortalApplication - id : UIPortalApplication 16:32:56,598 INFO [stdout] (http-localhost/127.0.0.1:8080-3) parent found : UIPortalApplication - id : UIPortalApplication Additional info: We think this caused by uiPortal.getAncestorOfType(UIPortalApplication.class) from UIComponent class which can't get the parent. We've got an actual proposed solution which is to use Util.getUIPortalApplication() instead to get the same thing (getSkin). Here is below the code snippet used: ----------------------- String theme = null; try{ theme = uicomponent.getSuitedTheme(null); } catch (RuntimeException e) { Map<String, String> themeMap = uicomponent.stringToThemeMap(uicomponent.getTheme()); if (themeMap.containsKey(uiPortalApp.getSkin())) { theme = themeMap.get(uiPortalApp.getSkin()); } else theme= uicomponent.DEFAULT_THEME.split(":")[1]; } ---------------------- While doing some searches, we found out Exo people have also used similar approach (refer to URL link below). http://lists.jboss.org/pipermail/gatein-commits/2010-November/005095.html Within Server.log we've got: Caused by: java.lang.NullPointerException at org.exoplatform.portal.webui.application.UIPortlet.getSuitedTheme(UIPortlet.java:270) [exo.portal.webui.portal-3.5.2.Final-redhat-4.jar:3.5.2.Final-redhat-4] at sun.reflect.GeneratedMethodAccessor1549.invoke(Unknown Source) [:1.7.0_06] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_06] at java.lang.reflect.Method.invoke(Method.java:601) [rt.jar:1.7.0_06] at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoCachedMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:229) [groovy-all-1.7.6.jar:1.7.6] at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:52) [groovy-all-1.7.6.jar:1.7.6] at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:124) [groovy-all-1.7.6.jar:1.7.6] at UIPortlet.run(UIPortlet.gtmpl:96) at org.exoplatform.groovyscript.GroovyScript.render(GroovyScript.java:99) [exo.portal.component.scripting-3.5.2.Final-redhat-4.jar:3.5.2.Final-redhat-4]