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Web server vs Application server

June 26, 2021 Ravi Yasas

Web vs application servers

The application server is the super one.
Each application server contains an inbuilt web server.
If you are not satisfied with the inbuilt server, you can add another web server to the application server.

Web server	Application server
Ex: Tomcat, Jetty, Resin	Ex: Glassfish, Wildfly, JBoss, WebSphere
Not J2EE compatible	J2EE compatible
Can run web applications only	Can run both web and enterprise applications
Support for HTML, JSP, Servlets...	Support for HTML, JSP, Servlets, EJB, JMS...etc as well.

June 25, 2021 Ravi Yasas

If you run mvn clean install in Spring Boot, you will get a fat jar file.
It contains everything like dependencies, embedded web server... etc.
You can just run java -jar jarFile in a JVM, the default is Tomcat embedded server or you can use Jetty.
You don't need any web server or application server to run spring boot jars.
Because spring boot will provide us a production-ready jar file with the embedded tomcat.
If you need to run spring boot applications in existing web servers, you may have to create war instead of a jar.
Spring Boot supports only Tomcat, Jetty, and Undertow as the embedded server