I am posting answer because this scenario is new for me. And I haven't got proper solution step by step.
According to the suggestion of M. Deinum
I created a web.xml
file under WEB-INF
folder. Project structure is like
src
|_ main
|_ java
|_ resources
|_ webapp
|_ WEB-INF
|_ web.xml
And in web.xml
I configured <session-timeout>...</session-timeout>
My web.xml
is like
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<session-config>
<session-timeout>5</session-timeout>
</session-config>
</web-app>
And now session time of my webapp in server is working according to my configuration. Thanks goes to M. Deinum