What is the method for configuring a Tomcat connection pool?

In Tomcat, you can configure a connection pool using the built-in JDBC connection pool or a third-party connection pool library such as Apache Commons DBCP or C3P0.

Here is a common method for configuring JDBC connection pool in Tomcat:

Add a datasource configuration in the context.xml file located in the conf directory of Tomcat. For example:

<Resource name="jdbc/myDataSource" auth="Container" 
          type="javax.sql.DataSource"
          maxTotal="100" maxIdle="30" maxWaitMillis="10000"
          username="your_username" password="your_password"
          driverClassName="com.mysql.jdbc.Driver"
          url="jdbc:mysql://localhost:3306/mydatabase"/>

In the web.xml file located in the WEB-INF directory of your web application, add a reference to the data source. For example:

<resource-ref>
    <res-ref-name>jdbc/myDataSource</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
</resource-ref>

3. Look up and utilize a data source in your application using JNDI, for example:

Context ctx = new InitialContext();
DataSource ds = (DataSource) ctx.lookup("java:/comp/env/jdbc/myDataSource");
Connection conn = ds.getConnection();

The above is a simple method to configure a connection pool in Tomcat, you can also choose a more suitable connection pool library and configuration method according to your own needs and environment.