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java.lang.IllegalArgumentException: adding a window to a container at java.awt.Container.addImpl(Container.java:1061) at java.awt.Container.add(Container.java:377) at JFrameInAContainerTest.main(JFrameInAContainerTest.java:11) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(JavacCompiler.java:271)