To build a jar file, change into Modeler'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.