Close the connector when the group is closed.
Register event
Change logging level to error on exception being thrown
Replace close by _del()_ and add null check
Close the reader when the import is done (see #10249)
Do not interrupt thread (see #10116)

As a general rule, Ice for Java does not work well in the
presence of thread interrupts.
see
http://www.zeroc.com/forums/help-center/
5057-ice-java-exception-ice-thread-pool-client.html
Pass the loader's id so it is removed from the map.
Pass loader id. Fix all calls.
Merge pull request #691 from jburel/cpu-fix

Cpu fix