[google-appengine] problems with Java 1.7.0_21 and the dev_appserver

[Gary Frederick]

Many of us are unable to get our apps to run with the dev_appserver when we 
update to Java 1.7.0_21. It works again if we go back to 1.7.0_17 or Java 6.

The error

java.io.IOException: Cannot find cached resource for URL: 
http://localhost:8888/ode2/webstartfile/v132-16-g0025b7e_d824h4eddfpc0kipeldr4iva1k9hgrc4x1ozk7q86g0hjtqzv82hheizrfaervtvr05omhmta51gkm9qasqckx8vr61zt1nzb2e52wp365oj0q69kjkdikxo0e8nc7b80takai1o3n/BlocksEditor.jar
    at com.sun.deploy.cache.Cache.getCachedResourceFilePath(Unknown Source)
    at 
com.sun.deploy.cache.ResourceProviderImpl.getCachedResourceFilePath(Unknown 
Source)
    at 
com.sun.javaws.security.JNLPSignedResourcesHelper.getSignedJNLPBits(Unknown 
Source)
    at 
com.sun.javaws.security.JNLPSignedResourcesHelper.getSignedJNLPFile(Unknown 
Source)
    at 
com.sun.javaws.security.JNLPSignedResourcesHelper.checkSignedLaunchDescHelper(Unknown
 
Source)
    at 
com.sun.javaws.security.JNLPSignedResourcesHelper.checkSignedLaunchDesc(Unknown 
Source)
    at 
com.sun.javaws.security.JNLPSignedResourcesHelper.checkSignedLaunchDesc(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.access$000(Unknown Source)
    at com.sun.javaws.Main$1.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

any ideas what to do to get it to work?

Gary

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