connection pooling

[mischa]

is there anything i can do to prevent ibatis from putting back 
connetions to the pool when they are already closed? i am working with 
cluster pairs and when the connection to one cluster fails i am 
switching back to another. it seems like the connection that failed/is 
closed is getting put back into the pool and is not getting 
reinitialized by the pool. so even if the first cluster is back online i 
am getting a

Cause: java.sql.SQLException: No operations allowed after connection closed.
any thoughts?
thanks,
mischa