The maven 2 source plugin creates a jar archive of the source files of the current project. the source plugin has five goals:
* source:aggregate aggregrates sources for all modules in an aggregator
project.
* source:jar is used to bundle the main sources of the project into a
jar archive.
* source:test-jar on the other hand, is used to bundle the test sources
of the project into a jar archive.
* source:jar-no-fork is similar to jar but does not fork the build lifecycle.
* source:test-jar-no-fork is similar to test-jar but does not fork the
build lifecycle.