When is the best time to validate input?
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What is clustering? What are the different algorithms used for clustering?
Why is actionform a base class rather than an interface?
does j2ee means advanced java
What are the diff types of exception?
what is container?
difference between ejb,struts,hibernate,spring and jsp
How to pass parameters in RMI?
Describe responsibilities of Activator?
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1) Scenario: I developed my application on local system and everything is perfect and tested. Now on UAT this application is deployed on clustered server environment. They are logical or physically clustered. But application is not working over there.  What is the issue with application?  What are the first things which come in your mind?