Besides the features of a class-based object-oriented language, Java integrates concurrency via its thread-classes, allowing for a multithreaded flow of control.Besides that, the language offers a flexible exception mechanism for handling errors or exceptional program conditions. To reason about safety-properties Java-programs and extending previous work on the proof theory for monitor synchronization, we introduce in this report an assertional proof method for JavaMT (Multi-Threaded Java), a small concurrent sublanguage of Java, covering concurrency and especially (exception handling). We show soundness and relative completeness of the proof method
