How to handle a Connection Timeout
Hi Everybody,
My situation is as follows: I have a web application, some sort of content management system. I'm using MySQL to store information. The application is obtaining Connection objects via a Connection Pool. I'm runngin Sun Java Application Server 8 Update 1 and MySQL 4.1.9 on a Windows 2003 Server machine.
After 8 hours of inactivity, the system it's raising an exception. Searching the log, I've found the cause, an SQL Exception with a "recv failed" error. Google said that MySQL shuts the idle connections after 8 hours, and also found a code to correctly handling that disconnection. The thing is that the Application Server is handling the connection pool to physically connect with the database, I'm not dealing with connection setup. I've tried setting autoReconnect and autoReconnectForPools properties (in the management console) without success.
Anyone has any idea to correct this?
Thanks in advance for your time.
Best regards
Antonio Varela.
You could execute a query from time to time, but you can't control which connection is being used. For example, you could be accessing the same connection all the time, and in the end only one functioning connection would remain in the pool.
As said in another thread,
The problem (in detail) is how the MySQL JDBC driver operates. The physical connection to the database can fail, but the Connection.isClosed() method will still return false.
So, there seems to be some problem with the MySQL driver.
But even in this case, the "connection validation" options should work on the application server, which they just don't. I am inclined to blame this problem on the connection pool implementation.
The only "solution" I found so far was to set larger connection timeouts on the MySQL server:
interactive_timeout = 2764800
wait_timeout = 2764800
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<?xml version="1.0" encoding="UTF-8"?>
<xml-fragment xmlns:ser="http://www.bea.com/wli/sb/services" xmlns:tran="http://www.bea.com/wli/sb/transports" xmlns:env="http://www.bea.com/wli/config/env" xmlns:http="http://www.bea.com/wli/sb/transports/http" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:con="http://www.bea.com/wli/sb/pipeline/config" xmlns:con1="http://www.bea.com/wli/sb/stages/transform/config" xmlns:con2="http://www.bea.com/wli/sb/stages/config" xmlns:con3="http://www.bea.com/wli/sb/stages/routing/config" xmlns:con4="http://www.bea.com/wli/sb/stages/logging/config">
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