JBoss 4.x EAR deployer is configured using the ear-deployer.xml. If the "Isolated" attribute is set to true, then JBoss will automatically create a separate class loader for the EAR (the classes/JAR's with in the EAR will no longer be automatically visible to other WAR/EAR's deployed on the server).
In JBoss 4.0.4 (or higher), the "Isolated" attribute for the EAR Deployer defaults to "false".
Please refer to the JBoss 4.0.4.GA release notes for more information.
