Tested build : 8-b255-2012-01-25_142
With corrupted enteries inside deployment cache, javaws -uninstall , loadng of jnlp applet or trying to clean cache using JavaCacheViewer will fail to work by throwing following exception
java.lang.IllegalArgumentException: Malformed \uxxxx encoding.
    at java.util.Properties.loadConvert(Unknown Source)
    at java.util.Properties.load0(Unknown Source)
    at java.util.Properties.load(Unknown Source)
    at com.sun.deploy.cache.Cache.getRemovedApps(Unknown Source)
    at com.sun.deploy.cache.Cache.saveRemovedApp(Unknown Source)
    at com.sun.javaws.CacheUtil.remove(Unknown Source)
    at com.sun.javaws.ui.CacheViewer$19.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)