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java.lang.IllegalArgumentException: adding a window to a container	at java.awt.Container.addImpl(	at java.awt.Container.add(	at JFrameInAContainerTest.main(	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(	at sun.reflect.DelegatingMethodAccessorImpl.invoke(	at java.lang.reflect.Method.invoke(	at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(