@Inject'ed bean at another @Singleton is null on @PostConstruct (both with @Startup)

module-a.jar and module-b.jar are both TL (top-level) delpoyments on JBoss AS 7.1.1

• module-a.jar has a @Singleton/@Startup named SharedBean
• module-b.jar has a @Singleton/@Startup named Bootstrap

module-b.jar depends on module-a.jar through jboss-deployment-structure.xml:

<jboss-deployment-structure>
<delpoyment>
<dependencies>
<module name="deployment.module-a.jar" />
</dependencies>
</deployment>
</jboss-deployment-structure>

When I enable module-a.jar, SharedBean is started fine (it has a @PostConstruct that logs its state)

When I enable module-b.jar, Bootstrap fails checking the @Inject'ed SharedBean on its @PostConstruct

Files:
-------------------------

1. module-a.jar

@Startup
@Singleton
public class SharedBean {
@PostConstruct
public void started()

{ LOGGER.info("SharedBean has started"); }

}

-------------------------

1. module-b.jar

@Startup
@Singleton
public class Bootstrap {
@Inject
private SharedBean sharedBean;

@PostConstruct
public void started()

{ LOGGER.info("sharedBean is null? " + (sharedBean == null)); }

}

There's no ClassNotFoundException or NoClassDefFoundError. The bean is just not injected correctly.