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if there is an invalid value set for the installRoot system property, the IDE can register an invalid server. The user can create Rails apps that target this bogus server This invalid server will be visible in the server list until the user restarts. After restart, the registry is corrected... since the code that reads the registry does a better check of the validity of the installRoot and the glassfish root. Any rails apps that target the bogus server will be orphaned...
http://hg.netbeans.org/web-main/rev/451da634dbd3