How can i extract  symbol table and Abstract syntax tree of a java compiler

How can i extract the Abstract Syntax tree and the Symbol Table from the class file of java.I need to have the code for extracting it.
Can anyone help me in this matter.
Sreeram

Everything that it is possible to retrieve from a class file can be deduced from the class file definition.
http://java.sun.com/docs/books/vmspec/2nd-edition/html/ClassFile.doc.html
Sylvia.

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