[wildfly-dev] How to work with an optional module dependency

Hi all, the Weld/CDI team is working on SWARM-568 [1] - to slim the module dependencies of the Weld subsystem. We will need to modify Weld subsystem so that some dependencies (EJB, JPA, etc.) are optional. And this brings additional complexity in the code. I wonder whether there are any tips/recommendations/guidelines/examples/etc how to work with an optional module dependency? More specifically, what is the best approach to detect a module availability? In Java SE one would usually take the ClassLoader and try to load some specific class... Also what is the safe and reliable way of "handling" the code which depends on an optional module. It seems a JVM impl may choose to link everything up front. So I think the only way is to create a separate class containing all the logic and call this class via reflection. Thanks a lot, Martin [1] https://issues.jboss.org/browse/SWARM-568 -- Martin Kouba Software Engineer Red Hat, Czech Republic