Programming with Java Bytecode [closed]

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Can Somebody tell me what is the Bytecode Engineering Library (BCEL) and how can i get it?

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From the web site:

The Byte Code Engineering Library is intended to give users a convenient possibility to analyze, create, and manipulate (binary) Java class files (those ending with .class). Classes are represented by objects which contain all the symbolic information of the given class: methods, fields and byte code instructions, in particular.

Get it from the downloads page.

(And yes, simply typing BCEL into Google would have told you all of this...)

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From the Jakarta Project, here is the BCEL definition:

The Byte Code Engineering Library is intended to give users a convenient possibility to analyze, create, and manipulate (binary) Java class files (those ending with .class). Classes are represented by objects which contain all the symbolic information of the given class: methods, fields and byte code instructions, in particular.

Such objects can be read from an existing file, be transformed by a program (e.g. a class loader at run-time) and dumped to a file again. An even more interesting application is the creation of classes from scratch at run-time. The Byte Code Engineering Library (BCEL) may be also useful if you want to learn about the Java Virtual Machine (JVM) and the format of Java .class files.

BCEL contains a byte code verifier named JustIce, which usually gives you much better information about what's wrong with your code than the standard JVM message.

Here is your resource for BCEL: http://jakarta.apache.org/bcel/manual.html

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There is a builtin copy, but if you want to download it I would suggest you find it with google. I prefer ObjectWeb ASM and there is also cglib and javassist.