EJB 3.1 FR 22.2.2.2 javax.ejb.embeddable.modules
If the target modules are part of the classpath, this property holds either a single module name (java.lang.String) or an array of module names (java.lang.String[]). For each specified module name, the container searches the class path for the first eligible ejb-jar or directory whose corresponding module name matches the given name. All specified modules must match an entry in the classpath.