[The Microsoft Windows Look and Feel - com.sun.java.swing.plaf.windows.WindowsLookAndFeel] not supported on this platform
Exception in thread "Thread-8" Exception in thread "Thread-4" Exception in thread "Thread-5" Exception in thread "Thread-2" Exception in thread "Thread-6" Exception in thread "Thread-10" Exception in thread "Thread-12" Exception in thread "Thread-13" java.lang.NullPointerException


( using linux )