CODEWITHSUNDEEP
javajava-meobfuscation
JohnRaja
JohnRaja

Reputation: 2357

In Class.forName got ClassNotFoundException when obfuscating in j2me

I am able to run the following example code 

//main class

  String a="Menu";

  Object o = Class.forName("org.test."+a).newInstance();

//Menu class

public class Menu()
{
public Menu()

{

  System.out.println("con called");

}

}

It runs fine, but when I obfuscate the code I get a no ClassNotFoundException.

I am using netbean 6.9.1 . In Additional obfusating setting i added -keepnames class org.test.Menu. But still not working. Any solution?

Upvotes: 1

Views: 954

Answers (5)

Jigar Joshi
Jigar Joshi

Reputation: 240870

When you obfuscate the code it changes class name by some a,b' and so on..

Upvotes: 0

T.J. Crowder
T.J. Crowder

Reputation: 1074168

This is by design. Obfuscation changes the names of all of your public identifiers (including class names), and so if you're referring to any of them via strings (like with Class.forName, or other forms of reflection), and especially strings that you calculate ("org.test." + a) that will break.

If you need to demand-load Menu via Class.forName, then you cannot obfuscate the Menu class.

It's been a long time since I looked at obfuscators, but IIRC some may be able to rewrite some strings for you if you tag them in a particular way; check the docs on the one you're using to see if it can. But even then, it's unlikely they'd be able to rewrite something like "org.test." + a for you. You'd have to have the full name in a single string.

Upvotes: 1

Nick
Nick

Reputation: 25799

Obfuscation changes the names of classes and so the name of class Menu will be changed to something else.

Upvotes: 0

Shekhar_Pro
Shekhar_Pro

Reputation: 18420

Obfuscation Changes the Tokens, Identifiers so your hard coded string ("org.test.Menu") for name wouldn't be found.

Upvotes: 0

Andreas Dolk
Andreas Dolk

Reputation: 114767

The trivial reason: The obfuscator changed the name of org.test.Menu to something else (package name changed and/or class name changed). And the obfuscator can't "refactor" the classes so that String based class names in other class files are changed too.

If this is the case, tell the obfuscator not to touch the org.test package (keep that name and don't obfuscate the name of the class(es) inside).

Upvotes: 6

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