According to section 10.4.4 of the 20090625 spec, Beans with scope @Dependent may not have conditional observer methods. If a bean with scope @Dependent has an observer method declared notify=IF_EXISTS, the container automatically detects the problem and treats it as a definition error, as defined in Section 12.4, "Problems detected automatically by the container".

Currently, the RI does not detect this problem.

See test org.jboss.jsr299.tck.tests.event.broken.observer.dependentIsConditionalObserver.DependentIsConditionalObserverTest