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javaclassloaderdecompilingjavassist

Obtaining source code of dynamically generated java classes

I am dynamically generating new classes (using Javassist) and I would like to be able to obtain the source code of such generated classes.

Is there a library for programmatically decompiling byte code?. Note that the byte code I want to decompile does not exist in the file system, only in memory.

Solution

  • If you want to decompile (i.e. get the original source), save the CtClass into a class file on disk, and then use a decompiler such as JD-GUI.

    ClassFile cf = someCtClass.getClassFile();
FileOutputStream os = new FileOutputStream("C:/somefilename.class");
cf.write(os);
os.close();

    Than just open up C:/somefilename.class in the decompiler.