Data dump

I am trying, programmatically in Java, to dump data to a changelog script. I can manage to dump the schema but cannot fathom how to just dump the data, resulting in the very same changelog script file if I had run this from the command line:

liquibase --driver=oracle.jdbc.OracleDriver --logLevel=flag </div>

      --classpath=/Users/mcutis/Projects/mcurtis/setup/ojdbc7.jar </div>

      --changeLogFile=db.changelog.data.xml </div>

      --url=“jdbc:oracle:thin:@//localhost:1521/orcl” </div>

      --username=root </div>

      --password=root </div>

      --diffTypes=“data” generateChangeLog