Development of multithreaded server applications is particularly tricky because of their Wondetenninistic execution behavior, availability requirements, and extended running times. New tools are needed to help programmers understand server behavior. Key to the realization of such tools is the ability to repeat nondeterministic execution behavior. This paper presents a platform for understanding and debugging Java server applications. DejaVu supports de-terministic
replay of nondetenninistic, multithreaded Java programs running on the J.&p&o virtual machine on unipmcessors. Jalapeiio is written in Java, and its optimizing compiler combines application, virtual machine, and DejaVu instrumentation code into unified machine-code sequences. Such integration compounds the difficulty of replaying nondeterministic behavior accurately and with minimal interference from the instrumentation. DejaVu ensures deterministic replay through symmetric insrrumenration-side-effect-preserving instrumentation in both record and replay modes-and remore reflection, which exposes the state of an application without perturbing it.
By: Bowen Alpern, Jong-Deok Choi ,Ton Ngo Manu Sridharan, John Vlissides, Hytm-Gyoo Yook
Published in: RC22036 in 2001
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