A demo late binding Java agent utilising ASM for transforming classes.
A simple library, it has a deliciously simple API for injecting code into already loaded classes.
We use Maven to handle our dependencies.
There are two classes to be concerned with: AgentLoader and Tools. AgentLoader contains the meat of the injector,
while Tools holds various IO helpers.
To load an agent, its as simple as:
Tools.loadAgentLibrary(); // Loads the OS-specific attach library
// Loads the agent in `Agent.class`, and packages `AgentLoader.class` as a dependency
AgentLoader.attachAgentToJVM(Tools.getCurrentPID(), Agent.class, AgentLoader.class);