How to check if a Session is still valid on the webserver?

I'd like if somebody knows if there is any method to check if a session is valid...I found isRequestedSessionIdValid() on HttpServletRequest interface...does anybody know any alternative?
[202 byte] By [ytsejama] at [2007-10-2 5:35:47]
# 1
what exactly are you trying to do?
kilyasa at 2007-7-16 1:46:22 > top of Java-index,Enterprise & Remote Computing,Web Tier APIs...
# 2
I've found the solution on findSession(String id) method of org.apache.catalina.Manager interface of catalina.jar package...I still did not test it but there are a lot of great utilities there...Do u think this package works only on Tomcat?thx
ytsejama at 2007-7-16 1:46:22 > top of Java-index,Enterprise & Remote Computing,Web Tier APIs...
# 3
what exactly are you trying to do?
sjasjaa at 2007-7-16 1:46:22 > top of Java-index,Enterprise & Remote Computing,Web Tier APIs...
# 4
Check if a sessio id is still valid...
ytsejama at 2007-7-16 1:46:22 > top of Java-index,Enterprise & Remote Computing,Web Tier APIs...
# 5
Why?request.getSession(false) returns null if there is no current session.
sjasjaa at 2007-7-16 1:46:22 > top of Java-index,Enterprise & Remote Computing,Web Tier APIs...