Single Signon With Different Web Servers

We have a customer with an existing customer portal solution. Customer
signs in with account number and password to a JBOSS server. This allows
customer to see their account data and other customer information. We
plan to deploy on a new application to a different Tomcat server within the
same network. Customer requires a single signon amongst the 2
applications. IE... After signing on the 1st JBOSS application, they want
to present a link to the new application but don't want to make customer
enter account number and password again. The new application needs access
to the account number and password in order to lookup customer equipment
and account information. We obviously need to make sure it is secure and
don't want to pass account numbers and passwords on a URL. We do plan to
use SSL.

We are looking for ideas on how to best enable this requirement.

Thanks Paul Holm

www.planetjavainc.com