To build a jar file, change into Validator's root directory and run
maven jar.
The result will be in the "m-target" subdirectory.
To build the Javadocs, run maven javadoc.
The result will be in "m-target/docs/apidocs".
To build the full website, run maven site.
The result will be in "m-target/docs".
Further details can be found in the commons build instructions.