To build a jar file, change into Launcher's root directory and run maven jar. The result will be in the "target" subdirectory.
To build the Javadocs, run maven javadoc. The result will be in "target/docs/apidocs".
To build the full website, run maven site. The result will be in "target/docs".
Further details can be found in the commons build instructions.
To build a jar file and the javadocs, change into Launcher's root directory and run ant dist. The result will be in the "dist" subdirectory.
Nightly Builds are built once a day from the current SVN HEAD. These are provided purely for test purposes and are NOT official releases of the Apache Software Foundation - Released versions of Commons Launcher are available here.