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NPE is thrown
Workaround is to run installer with JDK 5.
It is regression in Apple JDK 6 dp6. UIDefaults.get returns null for following keys: CheckBox.background, RadioButton.background, Button.background, ComboBox.background on system L&F. It works fine with JDK 5. I files issue #4764837 against Apple JDK. I will leave this issue open for some time to track issue.
Created attachment 34853 [details] Test case to reproduce problem
We use now different installer engine. It does not happen with it. Still it is Apple JDK bug. There is no progress on filed bug.