Why Does My Tomcat Application Show 'No Suitable Driver Found' When Using MySQL Connection Pooling?

Fixing "No suitable driver found" Error while Using Connection Pools

Problem:

When trying to connect to a MySQL database through Tomcat using connection pooling, the error "No suitable driver found for jdbc:mysql://localhost/dbname" occurs. Despite adding the required libraries to the WEB-INF/lib and classpath, the issue persists.

Explanation:

When using connection pools, the driver registration must be declared outside the application itself. In a Tomcat environment, this is typically achieved by placing the driver jar file in the server's lib folder (CATALINA_HOME/lib).

Solution:

1. Place the driver jar in the server lib folder: Copy the MySQL driver jar (connector-java-*.jar) to the Tomcat lib folder.
2. Ensure proper connection pool initialization: In your code, move the connection pool initialization (e.g., creating the PoolingDriver instance) to a ServletContextListener implementation or similar initialization mechanism that ensures it is initialized before the application context is loaded.

Example ServletContextListener:

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.apache.tomcat.dbcp.dbcp.ConnectionFactory;
import org.apache.tomcat.dbcp.dbcp.DriverManagerConnectionFactory;
import org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory;
import org.apache.tomcat.dbcp.dbcp.PoolingDriver;
import org.apache.tomcat.dbcp.pool.impl.GenericObjectPool;

public class DatabaseInitializer implements ServletContextListener {

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        try {
            GenericObjectPool connectionPool = new GenericObjectPool(null);
            ConnectionFactory connectionFactory = new DriverManagerConnectionFactory(
                "jdbc:mysql://localhost/dbname", "test", "password");
            PoolableConnectionFactory poolableConnectionFactory =
                new PoolableConnectionFactory(connectionFactory, connectionPool,
                                                null, null, false, true);
            PoolingDriver driver = new PoolingDriver();
            driver.registerPool("test", connectionPool);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {}
}

3. Redeploy your application to Tomcat: After making these changes, redeploy your application to Tomcat.

By following these steps, you should be able to resolve the "No suitable driver found" error and establish a connection to your MySQL database through Tomcat using connection pooling.

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