How to send a Keepalive from a solaris machine???

Question

Hi,
Do we have any Java API or way to send a Keep Alive from a client before the server sends a RST.
I have done the following kernel level settings in the Solaris box -:
ndd -set /dev/tcp tcp_keepalive_interval 14000
The reason we wanted to use keep alive was because we are seeing increasing number of IDLE connection in the Solaris box which is resulting in "too many open files error" and degrading the performance of the application.
netstat -an | grep IDLE | wc -l
65000
Do we have any other way to flush these IDLE connections?

Answer 1

In your servlet that controls the AJAX requests, set the session's timeout interval to 2 minutes less than its current interval. That way, the timeout gets shorter every 2 minutes with every AJAX call (which occurs every 2 minutes). In your servlet that controls your non AJAX requests, set the session's timeout to 1 hour.
//In the AJAX controlling servlet:
int twoMinutes = 2 * 60;
int inactiveInterval = session.getMaxInactiveInterval() - twoMinutes;
session.setMaxInactiveInterval(inactiveInterval);
//in the normal request controlling servlet:
int oneHour = 60 * 60;
session.setMaxInactiveInterval(oneHour);
Another way around it would be to store current request time in the session. For your AJAX requests, compare the current request time with the last request time and subtract that from the MaxInactiveInterval, which would give you more accuracy and less cross-dependence on the interval of your AJAX requests.
Ok,
I got the answer by this way...
Thanks to ALL.
By
MariMuthu.A