java.lang.OutOfMemoryError: Java heap space
   at sun.awt.X11.XToolkit.dispatchEvent(XToolkit.java:482)
   at sun.awt.X11.XToolkit.run(XToolkit.java:584)
   at sun.awt.X11.XToolkit.run(XToolkit.java:505)
   at java.lang.Thread.run(Thread.java:745)