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Please paste your code !! And be more specific with your problem !

Volatile is just a keyword in java. This can be used only with the variable declaration.
Example : volatile int variable_name;
- This indicate that the variable can be modified asynchronously by...

First you need to write down the following piece of code in web.xml :

<session-config>
<session-timeout>15</session-timeout>
</session-config>

Here we have set the session time out =...