To upgrade java in the envision need to follow below steps

1.  Stop ?NIC Webserver? and ?NIC EDI Service? 

2.  From the A-Server (E:\nic\4100\<node>) take a backup of jdk and delete entire jdk folder.

3.  Start installing java and provide jdk path is as follows (E:\nic\4100\<node>\jdk) and provide jre path is as follows (E:\nic\4100\<node>\jdk\jre) 

4.  Once after installation completed, do make an entry in the environment variables

Right click on My Computer (A-Server Node) -> select Properties -> click on Advance Tab -> click on Environment Variables -> under System Variables edit path variable and add below entry at the end

%_ENVISION%\jdk\bin 

5.  Start ?NIC Webserver? and ?NIC EDI Service?