AmbiguousDependencyException when using inheritance between simple beans
Hi!
I'm taking the first steps with webbeans (1.0.0.PREVIEW1) and face an AmbiguousDependencyException at application startup.
Scenario
Consider the following simple example:
- two classes, one extends the other
- both should be simple beans, but should have a different scope
- both should be named beans so that I can refer to them using EL
- one class gets instances of both classes injected
Speaking in code...
@Named
@ApplicationScoped
public class PocInfo implements Serializable {
...
}
@Named
@ConversationScoped
public class PocInfoGuess extends PocInfo {
...
}
@Named
@ConversationScoped
public class FunctionalityCheck implements Serializable {
@New
private PocInfo pocInfo;
@New
private PocInfoGuess pocInfoGuess;
...
}
Actual result: AmbiguousDependencyException
On startup (using jetty:run), I get the following exception:
2009-05-07 14:56:41.889::WARN: Failed startup of context org.mortbay.jetty.plugin.Jetty6PluginWebAppContext@a2d72e{/poc-webbeans-servlet,/Users/brainbug/Projekte/openconfigurator/sandbox/pocs/webbeans/trunk/webapp/src/main/webapp}
javax.inject.AmbiguousDependencyException: The injection point Field @New private pocInfo on Annotated class Class @Named @ConversationScoped FunctionalityCheck
Constructor public FunctionalityCheck();
Method String public check();
Method int public native hashCode();
Method Class public final native getClass();
Method boolean public equals(Object);
Method String public toString();
Method void public final wait(long, int);
Method void public final native wait(long);
Method void public final wait();
Method void public final native notify();
Method void public final native notifyAll();
with binding types [@New] in Conversation scoped simple bean 'functionalityCheck' info.openconfigurator.poc.webbeans.FunctionalityCheck, API types = [Object, Serializable, FunctionalityCheck], binding types = [@Current] has ambiguous dependencies
at org.jboss.webbeans.BeanValidator.validate(BeanValidator.java:116)
at org.jboss.webbeans.bootstrap.WebBeansBootstrap.boot(WebBeansBootstrap.java:207)
at org.jboss.webbeans.environment.servlet.Listener.contextInitialized(Listener.java:132)
at
...
What I expected
Well, I think this is obvious: in FunctionalityCheck I just wanted to inject two instances of different type. Whether or not it is nice OO design and Web beans like
to extend the injected types in order to apply different scopes to them - I would have expected that this simply works.
Questions
- why doesn't this work? ;)
- why is this ambigious? In Seam this would have been working since both injections would have been resolved by their names, don't they?
- how to use the same simple bean with different scopes?
Thanks in advance for any hint!
BTW. I already love Web Beans simply by reading the docs! Great, great work!
Cheers,
vivian
