Introduction

This project explores options on how to avoid already compiled files to be overwritten by aspectj-maven-plugin. Sometimes, we want to have aspectj-maven-plugin perform the weaving on already compile files, and not go back to the source.

How it works

Java files are compiled and placed in the target/unwoven-classes directory. After compilation, the bytecode of Main.class is modified to replace the string Hello with Fubar. Then weaving is applied and final class files end-up in the usual place: target/classes.

The aspect that is applied simply update the message displayed in the output with an uppercase version.

Tests to perform

Execute the project.

./run.sh

You should see FUBAR! in the output.

1. Remove the exclusion of the source code

In pom.xml, remove or comment out the <source/> tag. The output should be replaced with HELLO!.

2. Do not force weaving

In pom.xml, set forceAjcCompile to false. You should get a java.lang.ClassNotFoundException: org.example.Main. This is because weaving is not performed and target/classes doesn't contain any class because of that.