Bytecode Transformation-Tolerant Bytecode-Transformation in Java

Bytecode transformations at class-loading time in Java offer a good trade-off point in terms of dynamicity and power of transformation, execution performance, and portability of the applications transformed. However, they often limits the use of custom/system class loaders in application programs. This limitation is especially the pain for developing stacked containers, which are often used in application servers. This paper presents a transformation framework called EMPL for addressing this limitation. A transformation container using EMPL allows its application software stacks to transform the bytecode of their interest using customized class loaders. This paper also presents how to implement EMPL on top of the existing standard Java virtual machine and system class libraries without modifying them.

By: Michiaki Tatsubori

Published in: RT0781 in 2008


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