Thanks,
I commented off SingleSignOn as instructed on the link. 
<Host name="localhost" ...>
  ...
  <Valve className="org.apache.catalina.authenticator.SingleSignOn"
         debug="0"/>
  ...
</Host>

However, this makes authentication activated only once although the 
applications have different realms.
For example,
App1 and app2 have the same realm in web.xml, I just need to login once which 
is what I want to see.
however app3 has different realm in web.xml. when I change the url from app1 to 
app3, 
it didn't trigger the login page and allowed me in.
is there anything else missing?

Jill
-----Original Message-----
From: Christopher Schultz [mailto:ch...@christopherschultz.net] 
Sent: Wednesday, April 22, 2009 11:11 AM
To: Tomcat Users List
Subject: Re: form based authentication

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Jill,

On 4/22/2009 10:46 AM, Jill Han wrote:
> I tried to use form based authentication with JNDIRealm.  What I want to
> accomplish is to have the two applications with the same realm be
> authenticated once. It seems the tomcat ignored the realm. I have to
> login twice.

You're looking for SSI (Single Sign-On):

http://tomcat.apache.org/tomcat-6.0-doc/config/host.html#Single%20Sign%20On

- -chris
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