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The use of a custom Policy/SecurityManager makes it impossible to run Jini applications inside of the RCP which rely on the security provided by the features of the normal SecurityManager. There needs to be a plugable security manager supported if the IDE really needs one. The custom one that exists today, apparently is used to optimize file permission checks for speeding up those types of things. That's appropriate for the IDE, perhaps, but is not always useful for the RCP in general.