The Nasty NullPointerException in findAplletJKDLevel()

[Svetlozar Kostadinov]

Hello dear friends,

I am fighting for days with one very evil JNLP problem:

basic: JNLP2ClassLoader.findClass: com.buildware.navigator.AppletBase: try again ..
basic: exception: null.
java.lang.NullPointerException
	at sun.plugin2.applet.Plugin2Manager.findAppletJDKLevel(Unknown Source)
	at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
	at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Exception: java.lang.NullPointerException
Ignored exception: java.lang.NullPointerException

The JNLP file content is:

<?xml version="1.0" encoding="UTF-8"?>
   <jnlp spec="1.0+" href="FlightNavigatorApplet_local.jnlp">
    <information>
        <title>Filght Navigator</title>
        <offline-allowed/>
    </information>    
    
    <security>
        <all-permissions/>
    </security>
    
     <resources os="Windows">
       <property name="sun.java2d.noddraw" value="true"/>
     </resources>     
     
      <resources>
		<j2se href="http://java.sun.com/products/autodl/j2se" version="1.5+" initial-heap-size="512m" max-heap-size="512m"/>		
		<property name="sun.java2d.noddraw" value="true"/>
		<jar href="rxtxcomm.jar"/>
		<jar href="log4j-1.2.14.jar"/>
		<jar href="gpsinput-0.5.3.jar"/>
		<jar href="gpstool-0.5.3.jar"/>		
		<jar href="FengGUI.jar"/>
		<jar href="worldwind.jar"/>
		<jar href="SARApp.jar"/>
		<jar href="Components.jar"/>
	        <jar href="FlightNavigatorApplet.jar" main="true"/>
		<extension name="jogl" href="http://download.java.net/media/jogl/builds/archive/jsr-231-webstart-current/jogl.jnlp"/>
		<extension name="jinput" href="http://www.dustedpixels.com/download/webstart/JInput.jnlp"/>
    </resources>

     <resources os="Windows" arch ="x86">	
	    <nativelib href="rxtx-comm-natives-windows-i586.jar"/>
     </resources>
    
     <!-- Width and heigth are overwritten by the surrounding web page -->
     <applet-desc
         name="FlightNavigator Applet"
         main-class="com.buildware.navigator.FlightNavigatorApplet"
         width="600" height="400">
        <param name="separate_jvm" value="true" />
     </applet-desc>
   </jnlp>

Some guys suggest switching to the old Java Plug-In, but it doesn't help. Please, could you give some ideas what could mean this %^&**#!@ "findAplletJKDLevel()"