# 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 | Description
  --- | ---
  ClassDefinition | This class serves as a parameter block to the `Instrumentation.redefineClasses` method.
  ClassFileTransformer | A transformer of 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.