GAE AccessControlException on local server while initializing mongo

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I am getting this exception on my Google App Engine server, while running locally (localhost:8888)

java.security.AccessControlException: access denied (java.lang.RuntimePermission modifyThreadGroup) at java.security.AccessControlContext.checkPermission(AccessControlContext.java:376) at java.security.AccessController.checkPermission(AccessController.java:549) at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)

This is happening while I am initializing Mongo :

Mongo m = new Mongo("remote-mongo-db-host",port); //mongolab remote mongodb

Any clue why ?

Thanks :)

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