ProGuard - Problem obfuscating jar files

[Kieran Webster]

Hey CodeRanch.

Sorry if this is the wrong section, I didn't know where to post it.

I'm trying to obfuscate my jar files using ProGuard 4.8 to protect my source from being easily read, but each time I try, I'm getting an error.

 Note: client: can't find dynamically referenced class com.apple.eio.FileManager
Note: client accesses a declared method 'openURL(java.lang.String)' dynamically
Note: there were 1 unresolved dynamic references to classes or interfaces.
      You should check if you need to specify additional program jars.
Note: there were 1 accesses to class members by means of introspection.
      You should consider explicitly keeping the mentioned class members
      (using '-keep' or '-keepclassmembers').
Unexpected error while inlining method:
  Target class   = [Animation]
  Target method  = [unpackConfig(LStreamLoader;)V]
  Exception      = [java.lang.IllegalArgumentException] (Branch instruction can't be widened (goto_w +54541))
Not inlining this method
Unexpected error while inlining method:
  Target class   = [Animation]
  Target method  = [unpackConfig(LStreamLoader;)V]
  Exception      = [java.lang.IllegalArgumentException] (Branch instruction can't be widened (goto_w +54541))
Not inlining this method
Branch instruction can't be widened (goto_w +54541)

Once I got this error, I tried using a different jar file with different classes, and it worked. It said the process had been completed and my output jar file was exactly where I specified. When I extracted the classes though, I noticed that nothing was obfuscated and everything was readable if decompiled.

Could someone please tell me how I'd go about successful obfuscation? Thanks in advance.

[Kieran Webster]

Anyone? Please

[Paul Clapham]

After some poking around on the Proguard home page, I noticed that they have used the model "Release the code free, and charge for support". So if you are desperate for support, here's the place to go: Professional ProGuard Support.

Or if you want to look at alternatives, the Proguard page links to them too: Alternatives.