ActiveCluster depends on the following jars

• concurrent.jar
• commons-logging.jar
• JMS API (which you can get either as a standalone jar or complete J2EE jar from Apache Geronimo or from Sun).

In addition, the default implementation uses ActiveMQ which has its own dependencies. These are typicallyl

• concurrent.jar
• commons-logging.jar
• J2EE APIs (JMS, JTA, J2EE management)

You typically don't need the persistence options with ActiveMQ when using ActiveCluster, so things like JDBC / JDBM / BDB are not required for ActiveCluster.