Monitoring External Resources in Java MIDP

We present a Java library for mobile phones which tracks and controls at runtime the use of potentially costly resources, such as premium rate text messages. This improves on the existing framework (MIDP — the Mobile Information Device Profile [JSR 118 Expert Group. JSR 118: Mobile information device profile 2.0. Java specification request, Java Community Process, November 2002]), where for example every text message must be authorised explicitly by the user as it is sent. Our resource management library supports richer protocols, like advance reservation and bulk messaging, while maintaining the security guarantee that attempted resource abuse is trapped.