Datasource

[Lindomar]

Hi everybody!
I'm using this code for connect my app in tomcat 4.1:
$$$$$$$$
...
Connection conn = null;
    InitialContext ic = new InitialContext();
    DataSource ds = (DataSource)ic.lookup("myjndi")
     conn = ds.getConnection();
...
$$$$$$$$$
I configurate my connection in Adminitration Tool of tomcat. 
For JNDI Name i set to "myjndi"

Until here ok, but when i start my app, appears exception: 
Name myjndi is not bound in this Context 

Any idea for this problem?

Thanks in advanced.