Having issues decompiling *any* class with Jode

Question

I've been staring at this issue for hours now. Any help is appreciated.

I wrote code that uses the Jode decompiler from the "embedded jode jar file". I want to use this version because it is under the Lesser GNU Public License.

Decompiler d = new Decompiler();
try {
    FileWriter fw = new FileWriter("c:\\jode.txt");

    d.setClassPath("C:\\mycode");

    ProgressListener p = new ProgressListener() {

        public void updateProgress(double arg0, String arg1) {
            System.out.println("inside of progress listener with arg0 = " +arg0+ " and arg1 = " +arg1);
        }
    };

    d.decompile("Test.class" , fw, p);

} catch (Exception ex) {
    ex.printStackTrace();
}

and I always get :

Exception in thread "main" java.lang.NoClassDefFoundError: Test.class
        at jode.bytecode.ClassInfo.loadInfo(ClassInfo.java:620)
        at jode.decompiler.ClassAnalyzer.<init>(ClassAnalyzer.java:86)
        at jode.decompiler.ClassAnalyzer.<init>(ClassAnalyzer.java:123)
        at jode.decompiler.Decompiler.decompile(Decompiler.java:191)
        at testdecompiler.Main.main(Main.java:45)

If I use

jode.decompiler.Main.decompile(...)

things work - but I can't use this class file because it resides in the jode.jar that is only GPL.

Answer 1

d.setClassPath("C:\\mycode");

This classpath looks awfully short to me.

Answer 2

Update: My original assumption was wrong, and to bad, the original exception/ message is thrown away, as far a i can see. The code where JODE fails looks like this:

 try {
      DataInputStream input = new DataInputStream
          (new BufferedInputStream
           (classpath.getFile(name.replace('.', '/') + ".class")));
        read(input, howMuch);            

  } catch (IOException ex) {
        String message = ex.getMessage();
      if ((howMuch & ~(FIELDS|METHODS|HIERARCHY
                       |INNERCLASSES|OUTERCLASSES)) != 0) {
          throw new NoClassDefFoundError(name);
        }

Since an IOException has to be thrown to get the NoClassDefFound, check anything regarding your IO subsytsem, e.g. the file.encoding. I guess you should patch JODE to get the detailed error message or debug to this point.

Answer 3

This is a guess, as i don't fancy myself with decompiling classes, but i think that u should use

d.decompile("Test" , fw, p);

instead of what u are using now. This could be similar to

Class.forName("ClassName")

without the "class" suffix.

Answer 4

I was able to reproduce the problem with all of the different binary versions of jode that are available from their web site. When I built a new version of jode using the mainline from svn, it worked fine. I also saw an entry in one of the jode forums where a user was complaining about the NoClassDefFound problem. His case sounded slightly different, but the jode developer suggested that he use the mainline from svn instead of the prebuild binary.