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JReport Designer provides three Exit functions: After Init Parameter, After Run and Before Run. These functions enable you to develop an action to be called before, during and after the process of running a report. A status will then be returned. If the returned status is true, the JReport Engine will go on running. If false, the JReport Engine will stop at this point.
For detailed information about the functions, refer to the JReport Exit Functions section in the JReport Designer User's Guide.