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The Java Card API provides a framework of classes and interfaces that hides the details of the underlying smart card interface, thus relieving developers from going through the swamps of microcontroller programming. This allows application developers to concentrate most of their efforts on the details of application, assuming proper use of the Java Card API calls regarding the correctness of the methods' invocation targets and their arguments and temporal safety, i.e. the requirement that certain method calls have to be used in certain orders. Several characteristics of the Java Card applets and their multiple-entry-point program structure make it possible for a potentially unhandled exception to reach the invoked entry point.
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