Share session data between 2 subdomains

Question

I am using tomcat 7.0.6 with jdk 1.6.0_22

Is it possible to share session data between 2 different domains with a common subdomain such as a.mydomain.com and b.mydom

Answer 1

Servlet Spec 3.0 (which is what Tomcat 7 supports) allows this by calling setDomain on SessionCookieConfig.

Details here: http://download.oracle.com/javaee/6/api/javax/servlet/SessionCookieConfig.html

You get SessionCookieConfig progammatically at webapp init time with a ServletContextListner - or you should be able to set it the value in web.xml.