Unexpected Exception: java.lang.NullPointerException

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Device name : HTC Incredible & Emulator
Device rooted (yes/no) :NO
Device OS version (1.5/1.6/2.0,...) : 2.1

Computer OS and version (Mac,Win,Linux,...) : Windows XP SP3
Java version (java -version from command line) : 1.7.0_03
ADB version (adb version from command line) : Android Debug Bridge version 
1.0.29
AndroidScreencast version :

What steps will reproduce the problem?
1. Download the screencast
2. Download ddlib.jar & android screencast.jar
3. Put them in the same location.
4. Point the same: javaws -codebase file:///C://Screencast 
androidscreencast.jnlp (here i have kept in c:/screencast. 
5. Now launch. 

Please help me how should i go about. 
Exception:

Unexpected Exception: Unexpected Exception: java.lang.NullPointerException
java.lang.NullPointerException
    at com.sun.javaws.security.SigningInfo.getCommonCodeSignersForJar(Unknown Source)
    at com.sun.javaws.security.SigningInfo.check(Unknown Source)
    at com.sun.javaws.security.JNLPSignedResourcesHelper.checkSignedResourcesHelper(Unknown Source)
    at com.sun.javaws.security.JNLPSignedResourcesHelper.checkSignedResources(Unknown Source)
    at com.sun.javaws.Launcher.prepareResources(Unknown Source)
    at com.sun.javaws.Launcher.prepareAllResources(Unknown Source)
    at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
    at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
    at com.sun.javaws.Launcher.launch(Unknown Source)
    at com.sun.javaws.Main.launchApp(Unknown Source)
    at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
    at com.sun.javaws.Main$1.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

What is the expected output? What do you see instead?

Please provide any additional information below.

Original issue reported on code.google.com by info.sg...@gmail.com on 22 May 2012 at 3:33