I was in the process of creating the URI guideline, a very complicated guideline with several PKCs/AKCs. I had already added the seven major symptoms (with associated data elements and links). Near the end of this process, the response from the program was gettting slower and slower. Finally, it locked up completely. selected owner id = new Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space at java.util.Hashtable.put(Hashtable.java:420) at javax.swing.text.html.CSS.<init>(CSS.java:444) at javax.swing.text.html.StyleSheet.addAttribute(StyleSheet.java:541) at javax.swing.text.StyleContext$NamedStyle.addAttribute(StyleContext.java:1488) at javax.swing.text.StyleContext$NamedStyle.setName(StyleContext.java:1298) at javax.swing.text.StyleContext$NamedStyle.<init>(StyleContext.java:1245) at javax.swing.text.StyleContext.addStyle(StyleContext.java:90) at javax.swing.text.StyleContext.<init>(StyleContext.java:70) at javax.swing.text.html.StyleSheet.<init>(StyleSheet.java:148) at javax.swing.plaf.basic.BasicHTML$BasicEditorKit.createDefaultDocument(BasicHTML.java:292) at javax.swing.plaf.basic.BasicHTML.createHTMLView(BasicHTML.java:37) at javax.swing.plaf.basic.BasicHTML.updateRenderer(BasicHTML.java:190) at javax.swing.plaf.basic.BasicButtonListener.propertyChange(BasicButtonListener.java:58) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276) at java.awt.Component.firePropertyChange(Component.java:7865) at java.awt.Component.firePropertyChange(Component.java:7865) at java.awt.Component.setForeground(Component.java:1520) at javax.swing.JComponent.setForeground(JComponent.java:2665) at sun.swing.WindowsPlacesBar.<init>(WindowsPlacesBar.java:97) at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.updateUseShellFolder(WindowsFileChooserUI.java:508) at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.installComponents(WindowsFileChooserUI.java:190) at javax.swing.plaf.basic.BasicFileChooserUI.installUI(BasicFileChooserUI.java:136) at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.installUI(WindowsFileChooserUI.java:127) at javax.swing.JComponent.setUI(JComponent.java:668) at javax.swing.JFileChooser.updateUI(JFileChooser.java:1762) at javax.swing.JFileChooser.setup(JFileChooser.java:360) at javax.swing.JFileChooser.<init>(JFileChooser.java:333) at javax.swing.JFileChooser.<init>(JFileChooser.java:286) at org.proteme.protean.EditPPCDialog.<init>(EditPPCDialog.java:100) at org.proteme.protean.Protean.fillEditPpcDialog(Protean.java:3533) at org.proteme.protean.Protean.doEditPpc(Protean.java:3422) at org.proteme.protean.Protean.processViewChange(Protean.java:468) Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space Exception in thread "Image Fetcher 1" java.lang.OutOfMemoryError: Java heap space