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CLOSE_WAIT Process left on Database Server after Java program runs.

Posted on 2008-10-28
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Last Modified: 2013-12-20
Even though I am closing my resultset, prepared statement, and database connection in the finally area of a try-catch, it is leaving a process on the database server that gets set to CLOSE_WAIT and then after about 3 hours goes to a LISTEN state and sits there until either the database is restarted or the PID killed. Why is this happening? What else do I need to do to tell the database server to get rid of that process? This is a problem because we only allow so many connections and after this program runs a 20 times, they are all taken up. This is a very simple Java program running on a Suse Linux server using JDBC against a Progress 10 database. Thanks for your help!
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Question by:HKersten
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jazzIIIlove earned 500 total points
ID: 22821776
Hi there;

Maybe the problem is in PreparedStatement...

PreparedStatement  the statement is cached and then the execution path is pre determined on the database server allowing it to be executed multiple times in an efficient manner...

But i am not sure...

Best regards...
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Author Comment

by:HKersten
ID: 22821802
Thanks jazzIIIlove, I'll try removing the prepared statements and post back the results!
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Author Closing Comment

by:HKersten
ID: 31510731
Thank you so much for your help! I wouldn't of guessed that it was the Prepared Statement cuasing this issue. You've saved me a bunch of time!
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Author Comment

by:HKersten
ID: 22822291
It was the Prepared Statements causing this issue. I switched them to Statement and now it works fine. Thanks!
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Expert Comment

by:jazzIIIlove
ID: 22822314
but beware of sql injections...
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Author Comment

by:HKersten
ID: 22822565
Sorry, I was mistaken, that did not fix the issue. I had some LISTEN processes still on the database server and apparently they were from the script running before so when I changed to statements and re-ran, it didn't create another process. If one is out there, it doesn't create another one. So it must have something to do with caching the process but I don't know why. Please let me know if you have any other suggestions.
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Expert Comment

by:jazzIIIlove
ID: 22822701
Hi there;

I am not sure that will work and it's a bad practice but well, let's assign the statements to null after closing them...
or

if you using linux:
a batch:
ps -Ao pid,command | grep java | grep eclipse
or:
kill -9 `pidof process_name`
replacing process_name by the name of process you want to kill
or:

a java code to kill process:
http://www.koders.com/java/fid4E9CF0CCE742471D5F25669CB19F951B2B0F454D.aspx

or:
http://www.experts-exchange.com/OS/Unix/Q_23703468.html

Best regards...
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Expert Comment

by:jazzIIIlove
ID: 22822718
You can take the points back i guess if you want...

I don't mind...since your question is not yet solved...By the way, you debug the code?
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