A fully working sample Maven plugin that parses and generates code with JavaParser
If you want to do this without bulding a custom plugin,
get some inspiration from JavaParser's code generator
which uses the exec-maven-plugin.
trace-code-pluginis the actual maven plugin. It demonstrates how to read and process source code and how to write it out again. The plugin itself simply adds a line to each method that prints its name (for "tracing.")use-pluginis a little project that executes the plugin on some source code. The results can be found in its target directory.
The Maven dependencies may lag behind the official releases a bit.
If you notice some problems with this setup, please open an issue.