JDBC Connectivity..

I am noting down the steps..which I performed during installation and
for using JDBC....
1. DO we have to use ./configure with-java ?
because when I use that I get error that it failed. Is this the reason I
am not able to eshtablish the connectivity...
In  O'reily book it is mentioned that we have to build the driver...How
does one do that??
I have copied the postgresql driver in /usr/local/tomcat/common/lib
directory..
also set the class path...restarted the tomcat and used the java file as
shown below...

public class Example1
> >>{
> >>public static void main(String[] argv)
> >>{
> >>    System.out.println("Checking if Driver is registerd");
> >>    try
> >>    {
> >>    Class.forName("org.postgresql.Driver");
> >>    }
> >>    catch(ClassNotFoundException cnfe)
> >>    {
> >>    System.out.println("Couldn't find the Driver");
> >>    cnfe.printStackTrace();
> >>    System.exit(1);
> >>    }
> >>    System.out.println("registered the Driver OK, so lets make a
> >>connection");
> >>    Connection c = null;
> >>
> >>    try
> >>    {
> >>    c=
> >>DriverManager.getConnection("jdbc:postgresql://localhost/trainneedcorp","postgres","admin");
> >>    }
> >>    catch(SQLException se)
> >>    {
> >>    System.out.println("Couldnt connect");
> >>    se.printStackTrace();
> >>    System.exit(1);
> >>    }
> >>    if(c != null)
> >>    System.out.println("WE CONNECTED");
> >>    else
> >>    System.out.println("Reaching here is not done");
> >>    }
> >>    }

> >>    I get the following error:
> >>
> >>java.lang.ClassNotFoundException: org.postgresql.Driver
> >>        at java.net.URLClassLoader$1.run(URLClassLoader.java:199)
> >>        at java.security.AccessController.doPrivileged(Native Method)
> >>        at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
> >>        at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
> >>        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
> >>        at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
> >>        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
> >>        at java.lang.Class.forName0(Native Method)
> >>        at java.lang.Class.forName(Class.java

Am I going wrong anywhere??