Error loading DBCP NoClassDefFoundError

[Benjamin Cuthbert]

All when i try and use the DBCP code i get the following error

java.lang.NoClassDefFoundError:
org/apache/commons/pool/impl/GenericObjectPool
       at complexcvfeed.OraThin.setupDataSource(OraThin.java:77)
       at complexcvfeed.OraThin.<init>(OraThin.java:35)

ANd in my class OraThin line 77 i have

  public static DataSource setupDataSource(String connectURI) {
      BasicDataSource ds = null;
       ds = new BasicDataSource();
       ds.setDriverClassName("oracle.jdbc.driver.OracleDriver");
       ds.setUsername("user");
       ds.setPassword("pass");
       ds.setUrl(connectURI);
      return ds;
  }

And 35 i have

       String dbUrl = "jdbc:oracle:thin:user/[EMAIL PROTECTED]:1521
:SID";
       DataSource dataSource = setupDataSource(dbUrl);

I have the commons-dbcp-1.2.1.jar in the class path, so i don't understand
why it does not work