JavaEE和OSGI：如何为某些osgi软件包获取BeanManager

Question

As I understand right every osgi bundle has its own cdi container. So I have the following situation - I have two bundles: A and B. Bundles are deployed in glassfish4. In bundle AI have cdi beans. In bundle BI don't have beans.xml -> no cdi container for the bundle B is created.

In bundle BI have a reference to bundle A (Bundle bundleA). How can I get in bundle B reference to bundle A cdi container. My current solution (in bundle B):

BeanManager bm = CDI.current().getBeanManager();

throws exception:

StandardWrapperValve[default]: Servlet.service() for servlet default threw exception

org.jboss.weld.exceptions.IllegalStateException: WELD-001328: Unable to identify the correct BeanManager. The calling class com.temp.MyClass is not placed in bean archive
    at org.jboss.weld.SimpleCDI.unsatisfiedBeanManager(SimpleCDI.java:89)
    at org.glassfish.weld.GlassFishWeldProvider$GlassFishEnhancedWeld.unsatisfiedBeanManager(GlassFishWeldProvider.java:89)
    at org.jboss.weld.SimpleCDI$ClassNameToBeanManager.findBeanManager(SimpleCDI.java:67)
    at org.jboss.weld.SimpleCDI$ClassNameToBeanManager.load(SimpleCDI.java:47)
    at org.jboss.weld.SimpleCDI$ClassNameToBeanManager.load(SimpleCDI.java:40)
    at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3589)
    at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2374)
    at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2337)
    at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2252)
    at com.google.common.cache.LocalCache.get(LocalCache.java:3990)
    at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3994)
    at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4878)
    at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4884)
    at org.jboss.weld.SimpleCDI.getBeanManager(SimpleCDI.java:105)
    at org.jboss.weld.SimpleCDI.getBeanManager(SimpleCDI.java:38)

Answer 1

Calling BeanManager bm = CDI.current().getBeanManager(); is the correct way to obtain a BeanManager for current bean archive. Eg the bean archive to which the class where you invoke this belongs. That would be bundle B in your case. And you do not have a beans.xml there hence the exception.

As I understand right every osgi bundle has its own cdi container.

I am not much familiar with OSGI but from Weld perspective that would work. Weld sees any form of archive (jar, war, ...) as bean archive and for one bean archive you have one manager.

If you want a reference to BM from bundle A , obtain it there and expose a getter I suppose. The point is you need to invoke getBeanManager() from the actual archive it belongs to.

Maybe if you elaborated on what do you aim to achieve with that BM, I might help you further. Generaly speaking I would refrain from obtaining references to BMs from other archives. You can always have an exposed API and let the original archive deliver the services to you.