How do I run a Webstart application from the network? should I sign the jar file first? using jarsigner?

Im trying to run and test an application ran from webstart. I compiled the class, put it into a jar, made a jnlp file, and point a link to the jnlp file in the html page.

Now when web start runs, checking for the latest version, it says, "Unable to launch the JNLPFILE". I clicked on details

			

			An error occurred while launching/running the application.
			

			

			Title: THe JNLP
			

			Vendor: IWSPC
			

			Category: Download Error
			

			

			Unable to load resource: http://172.16.12.22:8988/Application1-IWSPortal-context-root/theJNLP.jnlp
			

		

Exception tabs says:

			NLPException[category: Download Error : Exception: java.io.IOException : LaunchDesc: null ]
			

			

			at com.sun.javaws.cache.DownloadProtocol.doDownload(Unknown Source)
			

			

			at com.sun.javaws.cache.DownloadProtocol.getLaunchFile(Unknown Source)
			

			

			at com.sun.javaws.LaunchDownload.getUpdatedLaunchDesc(Unknown Source)
			

			

			at com.sun.javaws.Launcher.downloadResources(Unknown Source)
			

			

			at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)
			

			....
			

			....