So far all our OpenJDK 9 tests put drools-core and drools-core in the "special" module. That's basically the anti-module for backwards compatibility. As soon as users start using module-info.java files themselves, there will be a big pressure for us to be a proper module, so to have our own module-info.java's. Because of our extended used of reflection, we need to validate this works long before OpenJDK 9 goes final, so we can still feed it back.

Reqs:

Add module-info.java to core and examples jar. Compile and run with both jars on the modulepath (instead of in the special classpath module).