Question

I am trying to understand connection pooling in java, i am using jsp, servlet and tomcat 6 server in my application. I have written the following code in a java class dbconnection.java:

I am using type 4 jdbc connection with oracle 10g EE in windows Xp OS

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

    public class dbconnection {   
     public Connection con = null;    
      public Connection getConnection() throws Exception, SQLException
       {
         try
           {
          Class.forName("oracle.jdbc.driver.OracleDriver");
           con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:abc","abc", "abc");           
           }
           catch(Exception e)
           {          
           }
        return con;
        }
    public void removeConnection() throws SQLException
  {
    con.close();
  }
 }

Then i am retriving connection in servlet as follows:

try{
 dbconnection db= new dbconnection();

 Connection con=db.getConnection();
 }
 catch(Exception e){
 } 
finally{
 db.removeConnection();//removes connection
}

Is it connection pooling or some configuration is required in tomcat server or something else?

Answer 1

You can get a third-party library, or you can use the connection pooling your Java EE container (for example, JBoss or WebSphere) provides for you.

To do this, you configure and use a JNDI datasource.

Here are details for Tomcat:

• http://people.apache.org/~fhanik/jdbc-pool/jdbc-pool.html

• http://www.tomcatexpert.com/blog/2012/01/24/using-tomcat-7-jdbc-connection-pool-production