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  Tutorial: Using the ASM Toolkit for Bytecode Manipulation

Using the ASM Toolkit for Bytecode Manipulation Sometimes Java developers need to generate or change Java bytecode in the runtime. Is can be necessary for AOP or debugging, or even for performance optimization. There are several frameworks available that

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The ASM bytecode manipulation framework has been designed and implemented to be small and as fast as possible. ASM's runtime .jar is only 25KB, compared to 350KB for BCEL. The load time overhead caused by class transformation with ASM is about 60 percent with ASM, compared to 700 percent or more with BCEL. These factors have been recognized by the Java community and several well known projects have switched to ASM, such as CGLIB and AspectWerkz. The list of projects that are using form the beginning ASM also includes Speedo, Groovy, dynaop, BeanShell, and a number of others.


 

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