How can I add a library to the classpath for use with Beanshell/APIConsumer

Since version 1.5.1.5, this is achieved by putting the JAR files in the folder lib within your Taverna home directory, usually ~/.taverna-x.y.z in Linux, C:\Documents and settings\MyUsername\Application data\Taverna-x.y.z in Windows and ~/Library/Application Support/Taverna-x.y.z in Mac OS X where "x.y.z" is replaced by the Taverna version such as "1.7.0".

Then right click on the processor in the workflow, Configure, go to Dependencies, and tick off which libraries to include in the classpath.