In order to generate the Javadocs documentation, as of Taverna 2.2.0, we have created the taverna-javadocs module in the net.sf.taverna.t2.taverna-workbench product in SVN. It is currently under the maintenance branch as we have done it after the Taverna 2.2.0 release, but it will be merged into the trunk for the next release.
This will activate the release profile and build javadocs documents for you in the
target/apidocs inside the module's directory.
Make sure you use Java 1.6! You can tweak these settings in the