NPE in LinkedList$ListItr.next when iterating over UIGroupMembershipSelect.getListMemberhip() --------------------------------------------------------------------------------------------- Key: GTNPORTAL-3475 URL: https://issues.jboss.org/browse/GTNPORTAL-3475 Project: GateIn Portal Issue Type: Bug Security Level: Public(Everyone can see) Reporter: Peter Palaga Assignee: Peter Palaga Fix For: 3.8.2.Final, 3.9.0.Final Attachments: GTNPORTAL-3475.log Looks like a concurrent modification of the {{LinkedList}} refered to by {{UIGroupMembershipSelect.listMemberhip}}, because: i. It is not always reproducible, the NPE occurs roughly once per 10 attempts. ii. It happens on line {{next = next.next}} of the JRE's {{LinkedList.ListItr}} where it is hard to thing of anything else than concurrent modification as a cause. Steps to reproduce: (1) Start clean Portal instance for the first time (2) Go to Application Registry (3) Import Applications Not OK: There is an NPE logged (the whole log is attached): {code:none} Caused by: java.lang.NullPointerException at java.util.LinkedList$ListItr.next(LinkedList.java:891) [rt.jar:1.7.0_55] at UIGroupMembershipSelector.run(UIGroupMembershipSelector.gtmpl:20) at org.exoplatform.groovyscript.GroovyScript.render(GroovyScript.java:99) [exo.portal.component.scripting-3.8.0.Beta02-SNAPSHOT.jar:3.8.0.Beta02-SNAPSHOT] at org.exoplatform.groovyscript.GroovyTemplate.render(GroovyTemplate.java:115) [exo.portal.component.scripting-3.8.0.Beta02-SNAPSHOT.jar:3.8.0.Beta02-SNAPSHOT] {code} Expected: No NPE