test passes on jdk1.8.0b95 and jdk1.7.0_25b17 but fails on jdk1.8.0b96 with exception

java.lang.NullPointerException
at javax.swing.SwingUtilities.appContextGet(SwingUtilities.java:1862)
at javax.swing.JComponent.getDefaultLocale(JComponent.java:2776)
at javax.swing.JComponent.<init>(JComponent.java:600)
at javax.swing.AbstractButton.<init>(AbstractButton.java:75)
at javax.swing.JButton.<init>(JButton.java:132)
at javax.swing.JButton.<init>(JButton.java:110)
at bug6190373.slam(bug6190373.java:26)
at bug6190373.main(bug6190373.java:22)
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:491)
at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
at java.lang.Thread.run(Thread.java:724)