J2se 1.5 jnlp installer extension

Has any one being successful in getting an installer extesion (using installer-desc) to run under j2se 1.5 webstart. It constantly fails with following error for me.
JNLPException[category: Launch File Error : Exception: null : LaunchDesc:[/b]
However this Runs well under j2se 1.4+
I am not sure this is a java bug or I am doing something wrong.
Any reply would be greatly appreciated.
Vajira

main jnlp file
<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="1.5+" codebase="http://eslserver:9085/installer_web/launch/" href="$$name">
     <information>
     <title>FSOnline Desktop Client</title>
     <vendor>Future School</vendor>
     <homepage href="http://www.future.com.au"/>
     <description>Version 1.0</description>
     <description kind="short">FSOnline Desktop Client</description>
     <icon href="images/icon.gif"/>
               <icon kind="splash" href="images/splash.jpg"/>
     <offline-allowed/>
     </information>
     <security>
     <all-permissions/>
     </security>
     <resources os="Windows" arch="x86">
     <j2se version="1.3+" maximum-heap-size="250m"/>
     <jar href="resources/app/rmiserver.jar"/>
     <jar href="resources/app/common.jar"/>
     <jar href="resources/app/bsf.jar"/>
     <jar href="resources/app/jaxp-api.jar"/>
     <jar href="resources/app/js.jar"/>
     <extension name="FSOnline Desktop Client Installer" href="installer-ext.jnlp"/>
     </resources>
     <application-desc main-class="com.fs.learner.core.rmi.FsdsRmiImpl">
          <argument>Main.htm</argument>
          </application-desc>
     </jnlp>
installer extension is as follows
<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="1.5+" codebase="http://eslserver:9085/installer_web/launch/" href="$$name">
     <information>
     <title>FSOnline Desktop Client Installer</title>
     <vendor>Future School</vendor>
<homepage href="http://www.future.com.au"/>
     <icon href="images/icon.gif"/>
     <offline-allowed/>
     </information>
     <security>
     <all-permissions/>
     </security>
     <resources os="Windows" arch="x86">
          <j2se version="1.3+" maximum-heap-size="250m"/>
          <jar href="resources/app/installer.jar"/>
     </resources>
     <installer-desc main-class="com.fs.launch.core.Welcome"/>
</jnlp>

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