An exception of this type is thrown from Instrumentation.redefineClasses( ) if a requested redefinition cannot be performed. This might occur, for example, if the redefinition attempts to add or remove members from the class.

Figure 10-84. java.lang.instrument.UnmodifiableClassException

public class UnmodifiableClassException extends Exception {
// Public Constructors
     public UnmodifiableClassException( );  
     public UnmodifiableClassException(String s);  
}

Thrown By

Instrumentation.redefineClasses( )