| Package | Description | 
|---|---|
| java.lang.instrument | 
 Provides services that allow Java programming language agents to instrument programs running on the JVM. 
 | 
| Class and Description | 
|---|
| ClassDefinition
 This class serves as a parameter block to the  
Instrumentation.redefineClasses method. | 
| ClassFileTransformer
 An agent provides an implementation of this interface in order
 to transform class files. 
 | 
| IllegalClassFormatException
 Thrown by an implementation of
  
ClassFileTransformer.transform
 when its input parameters are invalid. | 
| UnmodifiableClassException
 Thrown by an implementation of
  
Instrumentation.redefineClasses
 when one of the specified classes cannot be modified. | 
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