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GenericJDBCException: Cannot open connection

Sham Phadtale
Ranch Hand

Joined: Jul 29, 2008
Posts: 75
Hi I am updating MySQL database from Swing Client and jboss-5.1.0.GA as a server. The bean which I want to update is EJB3 enity bean.
While updating i am getting following exception. When I update less no of rows I did not get it, but if no of rows increase I get this exception. Please anyone have any clue about how to get rid this exception.
I am sorry as I dont know which tag should use to copy stack trace, I am using code tag..
Ifteqar Ahmed
Ranch Hand

Joined: May 02, 2011
Posts: 85


There is some hard limit on the database server about the maximum number of concurrent connections. You've reaching this limit, when you try and get another connection it fails.

Please check your Configuration File (Ex - mysql-ds.xml) file for the maximum and Minimum number of Concurrent Connections to the Database.

Sham Phadtale
Ranch Hand

Joined: Jul 29, 2008
Posts: 75
Do you want to say pool size? Following is my *-ds.xml file.

Do I need to add some annotations like TransactionType(?) to my code which is updating database? What should I do to fix the issue?
I agree. Here's the link:
subject: GenericJDBCException: Cannot open connection
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