There are 2 javax.swing.plaf JCK SigTest failures in OpenJDK 6 build b02.

Added Fields
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javax.swing.plaf.basic.BasicFileChooserUI: field protected javax.swing.Icon javax.swing.plaf.basic.BasicFileChooserUI.viewMenuIcon

LinkageError
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javax.swing.plaf.metal.MetalInternalFrameTitlePane: thrown java.lang.NoClassDefFoundError: javax.swing.plaf.basic.BasicInternalFrameTitlePane

These failures need to be fixed for OpenJDK 6 to pass the JCK.
The new bug 6637821 was filed for the described InternalFrameTitlePane problem
so the current but is only about BasicFileChooserUI