I am really not idea,java:comp not bound?!

Question

Hi everyone:
I do this all the day but don't successful till now. :(
I want to send a mail using Tomcat4.I setted the Mail Session JNDI in Tomcat console.Jndi is: mail/session , host: localhost
But When I run the Servlet,Tomcat says:"java:comp not bound to this context"
The method is according to the tomcat document.
servlet code is:"Context initCtx = new InitialContext();
Context envCtx = (Context) initCtx.lookup("java:comp/env");
Session session = (Session)envCtx.lookup("mail/session");"
Even I change the code to"Context initCtx = new InitialContext();
Session session = (Session)initCtx.lookup("mail/session");"
I also add the resource ref to web.xml and it is:
     <resource-ref>
               <res-ref-name>mail/session</res-ref-name>
               <res-type>javax.mail.Session</res-type>
               <res-auth>Container</res-auth>
</resource-ref>
Tomcat says :"mail not bound to this context"
Why?Someone help me?

Answer 1

I forget to say: I had already set the value :
<Resource auth="Container" name="mail/session" scope="Shareable" type="javax.mail.Session"/>
<ResourceParams name="mail/session">
<parameter>
<name>mail.smtp.host</name>
<value>localhost</value>
</parameter>
</ResourceParams>
in server.xml.
:(