I am working on JavaFx technology for a while using Netbeans : Product Version: NetBeans IDE 8.1 RC (Build 201510012201) Updates: NetBeans IDE is updated to version NetBeans 8.1 Patch 1 Java: 1.8.0_71 recently the debugger of Netbeans start to stop on any event without breakpoints ! I searched on this issue I found this is Bug ?! I am not persuaded on this answer cause I have this case before some years ,as I remember, and I had a solution pleeeez help me with your suggestion thank you very much