When I launch webpad demo for the second time, I got the following exception:

java.io.IOException: insert failed in cache: target already exixts
        at com.sun.javaws.cache.DiskCache.insertMuffinEntry(DiskCache.java:274)
        at com.sun.jnlp.PersistenceServiceImpl$5.run(PersistenceServiceImpl.java:237)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sun.jnlp.PersistenceServiceImpl.create(PersistenceServiceImpl.java:232)
        at WebPad.initPersistence(WebPad.java:424)
        at WebPad.<init>(WebPad.java:98)
        at WebPad.main(WebPad.java:498)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.sun.javaws.Launcher.executeApplication(Launcher.java:778)
        at com.sun.javaws.Launcher.executeMainClass(Launcher.java:740)
        at com.sun.javaws.Launcher.continueLaunch(Launcher.java:625)
        at com.sun.javaws.Launcher.handleApplicationDesc(Launcher.java:352)
        at com.sun.javaws.Launcher.handleLaunchFile(Launcher.java:177)
        at com.sun.javaws.Launcher.run(Launcher.java:145)
        at java.lang.Thread.run(Thread.java:484)

It happens on all platform.

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