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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(