[jboss-user] [Javassist user questions] - Re: Problem Instrumenting System classes

ralkema do-not-reply at jboss.com
Wed Jul 9 04:44:59 EDT 2008

hi, I just ran into the same thing.  But I have managed to solve it eventually..

The problem is, that hiddenValue is not a public field, so the MyApp.java should call getDeclaredField instead of getField.

And the fact that javap doesn't see it, is because it reads the String.class from the rt.jar.
If you call javap -bootclasspath <path.to.new.string> java.lang.String then you will see the 'hiddenValue' field

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