I'm getting following error when editing JSPs and unable to save.
OS: Mac OS X 10.4.8
Platform: Intel Core 2 Duo
JVM Version: 
java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-113)
Java HotSpot(TM) Client VM (build 1.5.0_06-68, mixed mode, sharing)


java.lang.AbstractMethodError: org.apache.xerces.dom.DeferredDocumentImpl.setDocumentURI(Ljava/
lang/String;)V
	at org.apache.jasper.xmlparser.ParserUtils.parseXMLDocument(ParserUtils.java:202)
	at org.apache.jasper.xmlparser.ParserUtils.parseXMLDocument(ParserUtils.java:166)
	at org.apache.jasper.compiler.JspConfig.processWebDotXml(JspConfig.java:89)
	at org.apache.jasper.compiler.JspConfig.init(JspConfig.java:219)
	at org.apache.jasper.compiler.JspConfig.findJspProperty(JspConfig.java:273)
	at org.apache.jasper.compiler.ExtractPageData.extractPageData(ExtractPageData.java:73)
	at org.apache.jasper.compiler.ExtractPageData.isXMLSyntax(ExtractPageData.java:53)
	at org.netbeans.modules.web.jspparser_ext.WebAppParseSupport.getJspOpenInfo
(WebAppParseSupport.java:149)
	at org.netbeans.modules.web.jspparser.JspParserImpl.getJspOpenInfo(JspParserImpl.java:122)
	at org.netbeans.modules.web.core.jsploader.TagLibParseSupport.getCachedOpenInfo
(TagLibParseSupport.java:247)
	at org.netbeans.modules.web.core.jsploader.JspDataObject.getFileEncoding(JspDataObject.java:
165)
	at org.netbeans.modules.web.core.jsploader.BaseJspEditorSupport.getObjectEncoding
(BaseJspEditorSupport.java:311)
	at org.netbeans.modules.web.core.jsploader.BaseJspEditorSupport.getObjectEncoding
(BaseJspEditorSupport.java:300)
	at org.netbeans.modules.web.core.jsploader.BaseJspEditorSupport.saveDocument
(BaseJspEditorSupport.java:339)
	at org.netbeans.modules.web.core.jsploader.BaseJspEditorSupport.saveDocument
(BaseJspEditorSupport.java:321)
	at org.netbeans.modules.web.core.jsploader.BaseJspEditorSupport$5.save
(BaseJspEditorSupport.java:283)
	at org.openide.actions.SaveAction.performAction(SaveAction.java:57)
	at org.openide.util.actions.NodeAction$DelegateAction$1.run(NodeAction.java:537)
	at org.netbeans.modules.openide.util.ActionsBridge.doPerformAction(ActionsBridge.java:53)
	at org.openide.util.actions.NodeAction$DelegateAction.actionPerformed(NodeAction.java:533)
	at org.openide.windows.TopComponent.processKeyBinding(TopComponent.java:880)
	at javax.swing.JComponent.processKeyBindings(JComponent.java:2809)
	at javax.swing.JComponent.processKeyEvent(JComponent.java:2726)
	at java.awt.Component.processEvent(Component.java:5331)
	at java.awt.Container.processEvent(Container.java:2010)
	at java.awt.Component.dispatchEventImpl(Component.java:4021)
	at java.awt.Container.dispatchEventImpl(Container.java:2068)
	at java.awt.Component.dispatchEvent(Component.java:3869)
	at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1810)
	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:
672)
	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent
(DefaultKeyboardFocusManager.java:920)
	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions
(DefaultKeyboardFocusManager.java:798)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:636)
	at java.awt.Component.dispatchEventImpl(Component.java:3907)
	at java.awt.Container.dispatchEventImpl(Container.java:2068)
	at java.awt.Window.dispatchEventImpl(Window.java:1774)
	at java.awt.Component.dispatchEvent(Component.java:3869)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)