javaws -import http://nicole1.sfbay.sun.com:8080/JavawsMustangIntegTest/cacheViewer/CacheViewer_Library.jnlp

or

javaws http://nicole1.sfbay.sun.com:8080/JavawsMustangIntegTest/cacheViewer/CacheViewer_Library.jnlp

both fail with:

java.lang.Exception: Internal Error: Internal error, no JREDesc and no JREInfo
at com.sun.javaws.Launcher.prepareLaunchFile(Launcher.java:400)
at com.sun.javaws.Launcher.prepareToLaunch(Launcher.java:198)
at com.sun.javaws.Launcher.launch(Launcher.java:111)
at com.sun.javaws.Main.launchApp(Main.java:306)
at com.sun.javaws.Main.continueInSecureThread(Main.java:210)
at com.sun.javaws.Main$1.run(Main.java:107)
at java.lang.Thread.run(Unknown Source)