java.lang.OutOfMemoryError: Java heap space
   at java.awt.image.DataBufferInt.<init>(DataBufferInt.java:75)
   at java.awt.image.Raster.createPackedRaster(Raster.java:467)
   at java.awt.image.DirectColorModel.createCompatibleWritableRaster(DirectColorModel.java:1032)
   at java.awt.GraphicsConfiguration.createCompatibleImage(GraphicsConfiguration.java:186)
   at bluej.editor.moe.NaviView.paintImgBuffer(NaviView.java:385)
   at bluej.editor.moe.NaviView.createImgBuffer(NaviView.java:609)
   at bluej.editor.moe.NaviView.setBounds(NaviView.java:177)
   at javax.swing.BoxLayout.layoutContainer(BoxLayout.java:447)
   at java.awt.Container.layout(Container.java:1508)
   at java.awt.Container.doLayout(Container.java:1497)
   at java.awt.Container.validateTree(Container.java:1693)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validate(Container.java:1628)
   at javax.swing.JLayeredPane.addImpl(JLayeredPane.java:232)
   at java.awt.Container.add(Container.java:971)
   at javax.swing.JRootPane.setContentPane(JRootPane.java:626)
   at javax.swing.JFrame.setContentPane(JFrame.java:698)
   at org.netbeans.core.windows.EditorOnlyDisplayer.switchCurrentEditor(EditorOnlyDisplayer.java:138)
   at org.netbeans.core.windows.EditorOnlyDisplayer.onRegistryChange(EditorOnlyDisplayer.java:119)
   at org.netbeans.core.windows.EditorOnlyDisplayer.access$000(EditorOnlyDisplayer.java:69)
   at org.netbeans.core.windows.EditorOnlyDisplayer$1.propertyChange(EditorOnlyDisplayer.java:81)
   at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:335)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:327)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:263)
   at org.netbeans.core.windows.RegistryImpl.doFirePropertyChange(RegistryImpl.java:329)
   at org.netbeans.core.windows.RegistryImpl.access$100(RegistryImpl.java:69)