Hi,

I'm having 2 problems with Plexus:

1) I tried to upgrade and it's not working. They've dropped the  
ability to dynamically register a new component instance for an  
existing role. Jason Van Zyl said he's ok to fix it but he's busy on  
other stuff and it's been now 2 weeks since he said he'll fix it.   
Generally speaking there are not many people working on Plexus core so  
it's not moving much.

2) I tried using events (it was there in alpha-31 but seem to have  
disappeared in recent versions - I may be wrong. However since there's  
zero documentation I had to try to find it in the code and couldn't  
find it) and couldn't. Even in alpha-31 it doesn't work (it works only  
for components located in components.xml but since we're dynamically  
registering components it doesn't work for us.

Thus I'm more and more tempted to drop support for Plexus and instead  
use our Embedded component manager for now and start a xwiki-osgi  
module that would implement our SPI for OSGi. I've read OSGi  
documentation and it looks not too difficult to do.

I have all the code done for sending Component Manager events but it  
won't work with Plexus so I'm proposing to use our Embedded CM for  
now. In the meantime I'll try to talk to Jason to see what can be done  
on the plexus side.

WDYT?

Note that our Embedded CM hasn't been tested for multithreading so  
we'll need to verify it works in the 2.0 dev cycle and fix any  
threading issue.

Thanks
-Vincent

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