I am finding hard time connecting to RDS using JDBC connection, I am able to connect through MYSQL workbench, I deployed my WAR file in A WSwhich is running tomcat, this WAR file has my JDBCcode connecting to RDS, but I am not even able to establish connection. My code is as below:-

public static Connection getconnection(){

     String connectionUrl = "jdbc:mysql://testinstance.cj3ixhryi3fb.us-west-2.rds.amazonaws.com:3306/testDB";
        String dbUser = "testuser";
        String dbPwd = "usertest";
        Connection conn = null;

        try {
            conn = (Connection) DriverManager.getConnection(connectionUrl, dbUser, dbPwd);
            System.out.println("conn Available");
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            System.out.println("fetch otion error"+e.getLocalizedMessage());
        }

        return conn;
}   

I included all the necessary jar files, and rules security groups but no luck.

I am using the EC2 security group for RDS. Does RDS will use ec2 security groups? or I need to have different security group for RDS?

the testinstance is a working link if any one wanna test.