Request URI:/OA_HTML/AppsLocalLogin.jsp java.lang.NoClassDefFoundError

I'm using 11i(11.5.10.2) EBS in our environment. This is maintained for historical data and not in regular use. So the routine health check or any other formalities are not followed for this instance as we would do for any other normal EBS Instance.

Often I'll receive mails from users stating 'Cannot access 11i Instance'. On checking mostly the error will be

There are two ways to solve this issue.

Method 1:

Stop the apache, clear the cache and start the apache server as follows.

Once the apache is started, clear the browser cache and try to login. In most cases this workaround will solve the issue. If still you are facing issue even after this workaround, then follow the below given method 2.

Method 2:

Stop the application services, clear the cache, compile all the jsps, start the application services and try again.

Once the jsp compilation is finished, check any application related services are running. If so kill them and start the application services. 

Note: Here I killed all the specific user (applmgr --> My application OS user) related process, since it is not regular use and no business is running on this.

Now start the application services. Clear the browser cache and try to login. This time you can login.

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