Java heap space issue for loading images

Hi,
  I am using Abbot to test a Swing project that also uses Java 3D. When the project is launched via Abbot, it has to  load STL image/s. At this point following exception is thrown:

080331 13:33:13:190 abbot.script.EventExceptionHandler.exceptionCaught(EventExceptionHandler.java:22):
       Unexpected exception while dispatching events:
080331 13:33:13:190 Error at com.sun.j3d.utils.geometry.Triangulator.triangulate(Triangulator.java:328)
       at com.sun.j3d.utils.geometry.GeometryInfo.convertToIndexedTriangles(GeometryInfo.java:493)
       at com.sun.j3d.loaders.objectfile.ObjectFile.convertToTriangles(ObjectFile.java:979)
       at com.sun.j3d.loaders.objectfile.ObjectFile.makeScene(ObjectFile.java:1121)
       at com.sun.j3d.loaders.objectfile.ObjectFile.load(ObjectFile.java:1258)
       at com.sun.j3d.loaders.objectfile.ObjectFile.load(ObjectFile.java:676)
       at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
       at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
       at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
       at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
       at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
       at java.awt.Component.processMouseEvent(Unknown Source): java.lang.OutOfMemoryError: Java heap space
       (caught at abbot.script.EventExceptionHandler.exceptionCaught(EventExceptionHandler.java:23))

As it says at the end, is it a memory issue? If yes, how can I increase the heap size via Abbot?

Thanks and Regards,
Medha