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This issue was reported manually by eduardogqf. It already has 10 duplicates Build: NetBeans IDE 8.1 (Build 201510222201) VM: Java HotSpot(TM) 64-Bit Server VM, 25.66-b17, Java(TM) SE Runtime Environment, 1.8.0_66-b17 OS: Windows 7 User Comments: GUEST: cant start maven archetype using vaadin framework GUEST: Imported spring petclinic project (from github) and restarted NB 8.1 GUEST: debug GUEST: Ok GUEST: Running web app with JRebel. GUEST: erro ao depurar o projeto GUEST: running debug on project GUEST: . GUEST: "Run" on new Maven WebApp GUEST: Trying to run a maven project. Stacktrace: java.lang.NullPointerException at org.netbeans.modules.maven.j2ee.execution.ExecutionChecker.__isJrEnabled(ExecutionChecker.java:0) at org.netbeans.modules.maven.j2ee.execution.ExecutionChecker.checkRunConfig(ExecutionChecker.java:0) at org.netbeans.modules.maven.execute.PrereqCheckerMerger$Impl.checkRunConfig(PrereqCheckerMerger.java:87) at org.netbeans.modules.maven.api.execute.RunUtils.run(RunUtils.java:88) at org.netbeans.modules.maven.ActionProviderImpl.invokeAction(ActionProviderImpl.java:314) at org.netbeans.modules.maven.ActionProviderImpl$2.run(ActionProviderImpl.java:286)
Created attachment 158392 [details] stacktrace
I found the problem in my project, for some reason the server to run the project was missing(working before). In Projects > > Contextual Menu > Propertes / Run / Server The bug is why this configuration was lost.
Created attachment 158945 [details] stacktrace No idea.
The NPE was caused by JRebel NetBeans plugin and the bug is in versions 6.3.2-6.4.1. The fix will be in the next release, 6.4.2, but is also already available in nightly build, downloadable via https://zeroturnaround.com/software/jrebel/download/nightly-build/#!/netbeans.