XML archive not loaded by JBuilder........

Hello Guys,
I am having problems running my application via the Jbuilder in-built Tomcat. I have an XML parser jar file which contains class org.w3c.dom.Node
and when Jbuilder-Tomcat is run the Jar file (named parser.jar) get loaded as verified by my debug message.
I have even added the jar file to my classpath and path via control panel.
NOTE: Jar file resides in C:\<project-dir>\App-Root\Web-inf\lib\parser.jar.
And JBuilder 7 is configured to deploy the pplication from that location.
Please, help....
But, i keep getting the error below after logging into the application.
root cause
java.lang.NoClassDefFoundError: org/w3c/dom/Node
at org.apache.jasper.compiler.TldLocationsCache.processWebDotXml(TldLocationsCache.java:183)
at org.apache.jasper.compiler.TldLocationsCache.init(TldLocationsCache.java:157)
at org.apache.jasper.compiler.TldLocationsCache.getLocation(TldLocationsCache.java:357)