This paper presents Rubah, a new dynamic software updating (DSU) system for Java programs that works on stock JVMs. Rubah supports a large range of program changes (e.g., changes to the class hierarchy and updates to running methods), does not restrict important programming idioms (e.g., reflection), and, as shown by performance experiments using an updatable version of the H2 database management system, imposes low overhead on normal execution.
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