UnsupportedOperationException on GCache

I'm trying to retrieves all entries from a GoogleAppEngine cache. But when I try to call values, it will returns java.lang.Unsupported开发者_StackOverflow中文版OperationException.

How can I get that?

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Sounds like this is a JCache feature that's not supported by the App Engine Java Memcache API.

http://code.google.com/appengine/docs/java/memcache/usingjcache.html#Features_Not_Supported