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This bug was originally marked as duplicate of bug 168026, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 8.2 (Build 201609300101) VM: Java HotSpot(TM) 64-Bit Server VM, 25.91-b14, Java(TM) SE Runtime Environment, 1.8.0_91-b14 OS: Windows 10 User Comments: NIKHIL_PAREPPARAMBIL: I dont know what is the real problem, please help me. Stacktrace: java.lang.IllegalArgumentException: object is not an instance of declaring class at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:0) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.netbeans.modules.form.RADProperty.getTargetValue(RADProperty.java:122) at org.netbeans.modules.form.FormProperty.checkCurrentValue(FormProperty.java:1015)
Created attachment 163855 [details] stacktrace
Please provide more details how to reproduce this.