Hi Dan,
Well, this is more a Tomcat configuration question and not related to Flex/LCDS but take a look at the tomcat\conf\catalina.properties file. In there you can specify what jars, classes etc. are loaded by the different classloaders so I am guessing you would just add the classes from your oc4j container to one of loaders to get the classes into the classpath.
Hope that helps.
-Alex