connection pooling

[michael wimmer]

hi,
 
I use protomatter (protomatter.sourceforge.net) for connection pooling
and for now it seems to work pretty well. However, in this group and in
the tomcat documentation, connection pooling seems always been mentioned
in relation to JNDI or tyrex.
 
Could anybody provide me with some information about the difference in
these approaches and their relative merits and demerits?
 
thanks,
 
Michael