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Product Version = NetBeans IDE 8.0.2 (Build 201411181905) Operating System = Windows 7 version 6.1 running on amd64 Java; VM; Vendor = 1.8.0 Runtime = Java HotSpot(TM) 64-Bit Server VM 25.0-b70 NetBeans issue incorrect warning statement for instanceof. Code compiles and executes correctly. public class TestInstanceof { public static class Fubar implements Runnable { @Override public void run() { } } public static void main(String[] args) { Runnable runnable; runnable = new Fubar(); if(runnable instanceof Fubar) { Fubar fubar; fubar = (Fubar) runnable; } } }