# Uses of Package
java.lang.instrument

- Packages that use java.lang.instrument
  Package | Description
  --- | ---
  java.lang.instrument | Provides services that allow Java programming language agents to instrument programs running on the JVM.

- Classes in java.lang.instrument used by java.lang.instrument
  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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