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This bug was originally marked as duplicate of bug 248772, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 8.1 RC2 (Build 201510122201) VM: Java HotSpot(TM) Client VM, 25.66-b17, Java(TM) SE Runtime Environment, 1.8.0_66-b17 OS: Windows 7 User Comments: GUEST: Only open netbeans Stacktrace: org.netbeans.modules.deadlock.detector.Detector$DeadlockDetectedException: Load Open Projects at org.netbeans.modules.tomcat5.deploy.TomcatManager.isTomEE(TomcatManager.java:442) at org.netbeans.modules.tomcat5.util.TomcatProperties.getClasses(TomcatProperties.java:649) at org.netbeans.modules.tomcat5.j2ee.TomcatPlatformImpl.loadLibraries(TomcatPlatformImpl.java:542) at org.netbeans.modules.tomcat5.j2ee.TomcatPlatformImpl.getLibraries(TomcatPlatformImpl.java:195) at org.netbeans.modules.j2ee.deployment.devmodules.api.J2eePlatform.getLibraries(J2eePlatform.java:382) at org.netbeans.modules.j2ee.deployment.devmodules.api.J2eePlatform.<init>(J2eePlatform.java:272)
Created attachment 156940 [details] stacktrace
Created attachment 162381 [details] stacktrace unknown reason for deadlock