Adding C3PO Connection Pooling in Spring JDBC

Connection pooling is an operation in which a system pre-initializes the connections to be used in the future. This is done since creating connections at the time of use is an expensive operation. In this post we will learn how we can create C3P0 connection pooling in Spring JDBC (somebody is not using hibernate).





Spring Context File (applicaitonContext-persistance.xml)

Now we need to prepare a JDBC context file for spring. We need to define a Data source for the DB with all its credentials.

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns=""
	xmlns:xsi="" xmlns:p=""

	<!-- Employee DB data source. -->
	<bean id="employeeDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
		<property name="driverClass" value="${jdbc.driverClassName}" />
		<property name="jdbcUrl" value="${jdbc.employee_db_url}" />
		<property name="user" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
		<property name="maxPoolSize" value="${jdbc.maxPoolSize}" />
		<property name="minPoolSize" value="${jdbc.minPoolSize}" />
		<property name="maxStatements" value="${jdbc.maxStatements}" />
		<property name="testConnectionOnCheckout" value="${jdbc.testConnection}" />
	<context:component-scan base-package="com.javapitshop.dao">


In the example above we have created a C3P0 data source for the Employee DB with all its credentials and appropriate parameters. All credentials and settings aren’t mentioned in the context file. I have been using a dedicated properties file for that. Now this bean can be auto-wired in any DAO class as a DataSource object.



BaseDao Class

The Base DAO class is to define any abstract method or any common functionality which we need to use in all child classes. We can make it abstract or whatever we like according to our needs. Also note that I have overloaded its constructor to implement Logging. Now every child class needs to provide its class definition.

package com.icsmobile.faadplatform.dao;

import org.apache.log4j.Logger;
import org.springframework.jdbc.core.simple.SimpleJdbcDaoSupport;

 * Its the parent Dao class of the all the daos defined in the System.
 * @author JavaPitShop
public class BaseDao extends SimpleJdbcDaoSupport {

	//common logger for all the classes in the dao layer
	protected Logger logger;
	 * @param daoClass
	public BaseDao(Class<?> daoClass) {
		logger = Logger.getLogger(daoClass);



EmployeeJdbcDao is extending BaseDao and in its constructor it is autowiring the “employeeDataSource” which we have defined in the context bean.

public class EmployeeJdbcDAO extends BaseDao {

	 * Instantiates a new employee jdbc dao.
	 * @param userDataSource the employee data source
	public ApplicationJdbcDAO(DataSource employeeDataSource) {
	public EmployeeBO getEmployeeById(final int employeeId) {
		logger.debug("getEmployeeById(" + employeeId + ")");
		EmployeeBO employeeBO = null;
		StringBuilder queryString = new StringBuilder();

		queryString.append(" SELECT ")
				   .append( "*" )	
				   .append(" FROM employee ")
				   .append(" WHERE employee_id = ? ");

		Object[] parameterList = { employeeId };
		// execute query
		SqlRowSet dataRow = getJdbcTemplate().queryForRowSet(queryString.toString(), parameterList);
		if ( {
			// create application object
			employeeBO = getEmployeeBusinessObjectFromRowSet(dataRow);

		return employeeBO;
Reference: Adding C3PO Connection Pooling in Spring JDBC from our JCG partner Ch Shan Arshad at the Java My G.Friend blog.

Do you want to know how to develop your skillset to become a Java Rockstar?

Subscribe to our newsletter to start Rocking right now!

To get you started we give you two of our best selling eBooks for FREE!

JPA Mini Book

Learn how to leverage the power of JPA in order to create robust and flexible Java applications. With this Mini Book, you will get introduced to JPA and smoothly transition to more advanced concepts.

JVM Troubleshooting Guide

The Java virtual machine is really the foundation of any Java EE platform. Learn how to master it with this advanced guide!

Leave a Reply

three × 8 =

Java Code Geeks and all content copyright © 2010-2015, Exelixis Media Ltd | Terms of Use | Privacy Policy | Contact
All trademarks and registered trademarks appearing on Java Code Geeks are the property of their respective owners.
Java is a trademark or registered trademark of Oracle Corporation in the United States and other countries.
Java Code Geeks is not connected to Oracle Corporation and is not sponsored by Oracle Corporation.
Do you want to know how to develop your skillset and become a ...
Java Rockstar?

Subscribe to our newsletter to start Rocking right now!

To get you started we give you two of our best selling eBooks for FREE!

Get ready to Rock!
You can download the complementary eBooks using the links below: