posted by fhanik on April 1, 2010 03:19 PM

In this article we will focus on configuration of the high-concurrency connection pool. For ease of migration for Tomcat users, the configuration has been written to mimic that of Commons DBCP.

The documentation of jdbc-pool covers all the attributes. Please note that these attributes are also available as direct setters on the org.apache.tomcat.jdbc.pool.DataSource bean if you're using a dependency injection framework. So in this article we will focus on use cases, and different configurations for Tomcat.

Simple Connection Pool for MySQL

<Resource type="javax.sql.DataSource"
            name="jdbc/TestDB"
            factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
            driverClassName="com.mysql.jdbc.Driver"
            url="jdbc:mysql://localhost:3306/mysql"
            username="mysql_user"
            password="mypassword123"
/>

The first thing we notice is the factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" attribute.
When Tomcat reads the type="javax.sql.DataSource" it will automatically configure its repackaged DBCP, unless you specify a different factory. The factory object is what creates and configures the connection pool itself.

There are two ways to configure Resource elements in Apache Tomcat.

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