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This bug was originally marked as duplicate of bug 248265, 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 (Build 201510222201) VM: Java HotSpot(TM) 64-Bit Server VM, 25.102-b14, Java(TM) SE Runtime Environment, 1.8.0_102-b14 OS: Mac OS X User Comments: dathyrius: Do not know dathyrius: Project opened and started build all dathyrius: Buidling Project (twice) Stacktrace: org.netbeans.modules.deadlock.detector.Detector$DeadlockDetectedException: Thread-3891 at org.apache.tools.ant.IntrospectionHelper.getHelper(IntrospectionHelper.java:347) at org.apache.tools.ant.RuntimeConfigurable.maybeConfigure(RuntimeConfigurable.java:496) at org.apache.tools.ant.RuntimeConfigurable.maybeConfigure(RuntimeConfigurable.java:464) at org.apache.tools.ant.Task.maybeConfigure(Task.java:202) at org.apache.tools.ant.UnknownElement.configure(UnknownElement.java:199) at org.apache.tools.ant.UnknownElement.maybeConfigure(UnknownElement.java:163)
Created attachment 161461 [details] stacktrace