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Intermittent MySQLSyntaxErrorException: Unknown column - JDBC/Tomcat
Posted by: Bryan Kramer ()
Date: November 04, 2012 05:14PM

This is a Tomcat/JDBC mysql problem.

I am not using a resource or JNDI since the HTTP requests supply a database URL and credentials. The connection is made on every request to the servlet.

The environment is mysql (mysql Ver 14.12 Distrib 5.0.95, for redhat-linux-gnu (x86_64) on a different host, java 1.6.0_22 (OpenJDK 64-Bit Server VM (build 20.0-b11, mixed mode) CentOS 64 Bit, Tomcat 5.5 (also Tomcat 6), mysql-connector java 5.1.22. max_packet length is 10GB.

The result of the query contains about 400 columns when it works.

The problem is that some really long queries (~ 12,000 characters in the select statement) I get the syntax error exception for a while - after some time it starts correctly working again. All of the time, shorter queries work during the time when the long queries are not working. As a matter of fact I threw in a "show tables" before the big query - this always works correctly.

It sometimes seems to have to do with how active Tomcat is - this problem occurs when Tomcat has been idle a while. Unfortunately this servlet will not be heavily used in production so I need to solve this problem.

Any suggestions for fixes would be greatly appreciated.

Thanks

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Intermittent MySQLSyntaxErrorException: Unknown column - JDBC/Tomcat Bryan Kramer 11/04/2012 05:14PM


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