Bytecode Instrumentation

| 2004 JavaOne

Conference | Session 3042 Copyright Hewlett Packard Co., 2004.

Start-up: java.lang.instrument

•

Support for Agents (J2SE 5.0 beta 2)

─ -javaagent:classname=options

─ classname required to have method premain

─ public static void premain(String

agentArgs, Instrumentation inst);

─ premain()

called before application main()

• Interfaces

─ ClassFileTransformer

─ Instrumentation

: Services needed to instrument

• Classes

─ ClassDefinition

─ Parameter to Instrumentation.redefineClasses

method