The referenced libraries must be made available to all components contained within the referencing file, including any components contained within other JAR format files within the referencing file. For example, if a .ear file references an installed library, the library must be made available to all components in all .war files, EJB .jar files, application .jar files, and resource adapter .rar files within the .ear file.

A referenced installed library seems to only be made available to some (not all) components in an EAR.