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Abstract. We describe a prototype tool, hugo/RT, that is designed to automatically verify whether the timed state machines in a UML model interact according to scenarios specified by time-annotated UML collaborations. Timed state machines are compiled into timed automata that exchange signals and operations via a network automaton. A collaboration with time constraints is translated into an observer timed automaton. The model checker uppaal is called upon to verify the timed automata representing the model against the observer timed automaton.

Abstract.A semantics to a small fragment of Java capturing the new memory model (JMM) described in the Language Specification is given by combining operational, denotational and axiomatic techniques in a novel semantic framework. The operational steps (specified in the form of SOS) construct denotational models (configuration structures) and are constrained by the axioms of a configuration theory. The semantics is proven correct with respect to the Language Specification and shown to capture many common examples in the JMM literature.

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