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How do I get the bytecode of an existing class?

April 26, 2017bytecode class existing

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How do I get the bytecode of an existing class?

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If you want the bytecode instructions themselves, use TraceClassVisitor. If you want the ASM code to generate these bytecode instructions, use ASMifierClassVisitor. Both classes provide a “main” method to allow them to be called from the command line, passing your fully qualified class name as a parameter. Example: java -classpath “asm.jar;asm-util.jar;yourjar.jar” org.objectweb.asm.util.ASMifierClassVisitor org.domain.package.YourClass or java -classpath “asm.jar;asm-util.jar” org.objectweb.asm.util.ASMifierClassVisitor org/domain/package/YourClass.class Another, much easier method, if you are using Eclipse, is to use the Bytecode Outline plugin.