Lillero

Lillero is a Java bytecode patching framework built on top of the better known ASM library. It enables anyone to patch any Java program in multiple spots with relative ease, avoiding boilerplate code and repetitive tasks as much as possible.

The Lillero (or lll for short) ecosystem is made up of multiple components:

• The Library (javadoc)
• The Processor (javadoc)
• The Loader (javadoc)
• The Mapper (javadoc)
• The Mapping Writer (javadoc)

Finally, you can read the Book, a (work in progress) guide to the Lillero/ASM ecosystem, and to JVM bytecode patching in general.