This is very broken. You can't change the Capability interface in a stable release. Its part of the public spi. If you want a new method, then you should add a mixin interface, e.g. public interface Capability2 extends Capability { ... } and then have AbstractCapability implement it by invoking the old method calling code should do: | if (capability instanceof Capability2) | ((Capability2) capability).resolve(x, y, z); | else | capability.resolve(x, z); | View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4255163#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...