How to Prevent JDBC Datasource Memory Leaks in Tomcat 7?

JDBC Datasource Memory Leak in Tomcat 7

When shutting down Tomcat 7 using the JDBC datasource, users may encounter a warning message similar to the below:

Addressing the JDBC Driver Registration Issue

To resolve the issue related to unregistering the JDBC driver, ensure that the destroy-method is properly configured within the element in context.xml. The correct configuration should be:

Resolving the MySQL Statement Cancellation Timer Error

To address the error related to the MySQL Statement Cancellation Timer thread, follow these steps:

1. Move the MySQL Connector/Driver to tomcat/lib: Place the MySQL Connector/Driver JAR file in the tomcat/lib directory instead of deploying it within the WAR file. This prevents the creation of multiple instances of the driver upon each WAR deployment.
2. Add a Shutdown Hook to Tomcate: Introduce a shutdown hook to gracefully close the thread. Edit the web.xml file and add the following initialization parameter:

Create the MyShutdownHook class to execute upon Tomcat shutdown:

By implementing the above solutions, memory leaks related to JDBC datasource usage and the MySQL Statement Cancellation Timer issue can be effectively mitigated in Tomcat 7.

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