Is it possible to manage logs through Obfuscation with yGuard?

Question

I obfuscated a java web application and I ran into some trouble as below:

1. I have alot of uresolved external classes even though I have included in the ant build xml the external jar this way:

   <externalclasses>
     <pathelement location="${tomcatpath}/lib/"/>
     <pathelement location="${webinfdir}/lib/"/>
   </externalclasses
   

2. How can I manage logs to understand anything?

3. Can I also obfuscate the jsp files?