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POWhat are the specific uses of Java Application Server that cannot be done with web servers?
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copied!<p>I am a little confused about the roles of a java application server and its differences from a web server.<br> I found many sites explaining the same difference between the two but not to my satisfaction.<br> So please explain me about the two following cases:- </p> <p><strong>1)App. Server and its difference with web server:</strong> </p> <p>From these two links:<br> <a href="https://stackoverflow.com/questions/5039354/difference-between-an-application-server-and-a-servlet-container">Difference between an application server and a servlet container?</a><br> <a href="https://stackoverflow.com/questions/936197/what-is-the-difference-between-application-server-and-web-server">What is the difference between application server and web server?</a> </p> <p><strong><em>web server:</em></strong> It handles everything through http protocol by accepting requests from clients and sending<br> responses to them with the help of its servlet container(<strong>e.g Apache Tomcat</strong>)<br> <strong><em>App. Server:</em></strong> An application server supports the whole of JavaEE like JMS,JPA,RPC etc. </p> <p>Now what I am confused with is that how can I use a lot of JavaEE APIs like JMS,JPA etc. with my Tomcat<br> by adding their <strong>jar</strong> files in my web application ?<br> Does that mean that if I use an appliation server I don't have to add those <strong>jar</strong> files?(<em>I don't think so</em>) </p> <p><strong>2)The roles of an appl. server</strong> (This is very important to me) </p> <p>From Wikipedia<br> <a href="http://en.wikipedia.org/wiki/Application_Server" rel="nofollow noreferrer">http://en.wikipedia.org/wiki/Application_Server</a> </p> <p>An application server provides services such as security,transaction support etc.<br> <em>"The term is often used for web servers which support the JavaEE"</em> -- It sounds like if we add the required <strong>jar</strong> files of JavaEE APIs a web server becomes an appl. server.<strong>What about it.</strong> </p> <p>Now my question is <strong>how an application server performs the tasks of security control or transaction management by itself</strong> ?<br> <strong>E.g.</strong> in my web application using Spring framework I am providing security by using spring-security and transaction management by using @Transactional annotation and all those things you know.<br> So does the appl. server have anything to do with my security or transaction management or it has its own ways ? </p> <p><em>Forgive my ignorance.</em></p>

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