Maven offers a lot of standard plugins that let you write fully automated and reliable builds. You can even develop your own plugins if you have some specific needs. But it can be complicated to make a separate project for your custom plugin with a separate release lifecycle. Wouldn’t it be easier if you could just put your build code directly inside the project?
builder-maven-plugin adds a src/build/java folder on your project
Then you just write java classes with a few annotations in order to bind them to standard maven lifecycle.
In the end, you will still have a pom.xml file with the essential informations of the project (dependencies, scm…) but for all the more custom tasks, no more need to use a complex and poorly documented maven plugin, no more need for maven-antrun-plugin, you just code java in the project. This is only some examples of What you can do :