在通过Java Webstart运行时，invokeLater中出现NullPointerException

After upgraded from JRE 1.7.0_21 to 1.7.0_25-b15 my application started to throw NullPointerException in SwingUtilities.invokeLater(...) when it is run from Java WebStart. Surprisingly when it is executed as a standalone application (outside JWS), it works great. After upgraded from JRE 1.7.0_21 to 1.7.0_25-b1