Caused by: javax.servlet.ServletException: Communications link failure due to underlying exception:

hi,
I have installed Jetspeed2.1 and use Mysql for backend.
I have developed one API for giving links on login portlet after user logon
successfull to portal.
means:
1.user enter username and password
2.click on login
3.after successfull aunthecation through LDAP,by using username I fire query
on Mysql,
4.seraching on username,return some interger value.
5 On this integer value , I show some another links on login portlet like
email ....etc.


But this server stay ideal more than 8 hours,if I do login then
,aunthecation will be done successfully,but login portlet will show error on
portal :

Error: Portlet is Not Available: j2-admin::LoginPortlet
        Reason: null 


But if I see in log file :Error "Caused by: javax.servlet.ServletException:
Communications link failure due to underlying exception:"

I have implemented this API as:
JSP<->JavaBean<->ConnectionPool<->mysql.

how i solve this error?
plz

thanks,
ramj



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