title: Why do we need Application Server in Java
body: <p>Why do we need Application Server in Java like JBoss or WebSphere. Is it possible that we develop large scale website only with Java (Apache Tomcat). Where thousand of user connect on site at a moment. An example is a website like b2b.</p>
  
  <p>What is the cost of a Application Server? I will be thankful if you compare price among different application server and if there is any free version kindly highlight it.</p>