Re: JDBC Connection Pooling - Fred ?

["Richard Dettinger" <cujo@xxxxxxxxxx>]

Two things

1) Don't confuse reclaiming an object with the operations need to reclaim
system level resources.
     - In any situation where you are using system level resources (files,
databases, graphics services), you should take responsibility for the
close, free, whatever call.

     Key point:  You don't control when the garbage collector runs and it
doesn't run because objects *could* be cleaned up.  It runs because it has
to.

2) Don't assume that because you don't have access to an object that its
unreachable.
     - Example, you let go of a statement object... therefore it can be
garbage collected, right?
     - But there are references connecting a statement and its connection
both directions (because they end up needing each other to function
properly)
     - And there is a Pool object that has all the connection objects (so
it can do proper cleanup for you in various abnormal conditions)
     - And someone has a reference to the pool so that you can get a
connection again, right?
     - ... it becomes hard to call these objects unreachable in this
scenario, doesn't it?

     Key point:  Your application code isn't running in a vacuum on the
system.  There are all kinds of object references all over the place.

Bottom line:  Do the right thing and close your resources.  You will be
rewarded with greater scalability, portability, and maintainability in your
applications.

Regards,

Richard D. Dettinger
AS/400 Java Data Access Team

"Biologists have a special word for stability -- dead"

                Larry Wall
                Open Source Developers Journal
                Issue 1, Jan  2000


Madhavan Varadarajan <seawolf00@yahoo.com>@midrange.com on 07/02/2001
10:39:31 AM

Please respond to JAVA400-L@midrange.com

Sent by:  owner-java400-l@midrange.com


To:   JAVA400-L@midrange.com
cc:
Subject:  Re: JDBC Connection Pooling - Fred ?



Fred, I thought that GC also removes objects which
have no references (i.e. unreachable ?) So, if your
statement objects/result set objects do not have a
reference (beause the connection pool has been pushed
back to the con pool), they ideally need to be GC'd -
Am I right ?


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