public interface Foo<T extends Serializable> { } // will fail
public class FooBean implements Foo { }
public interface Bar<T> { } // will work
public class BarBean implements Bar { }
@Singleton
@Startup
public class TestSingleton {
    @Inject
    private Instance<Foo> foo;
    @Inject
    private Instance<Bar> bar;
    @PostConstruct
    public void init() {
        System.out.println("##### foo is unsatisfied = " + foo.isUnsatisfied());
        for (Foo f : foo)
            System.out.println("foo is: " + f.getClass().getCanonicalName());
        System.out.println("##### bar is unsatisfied = " + bar.isUnsatisfied());
        for (Bar b : bar)
            System.out.println("bar is: " + b.getClass().getCanonicalName());
    }
}

22:30:25,904 INFO  [stdout] (ServerService Thread Pool -- 50) ##### foo is unsatisfied = true
22:30:25,905 INFO  [stdout] (ServerService Thread Pool -- 50) ##### bar is unsatisfied = false