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I am new to java web development.
Currently I’m learning technologies such as Servlets, Jsp, and Java Frameworks like Spring etc.
I was wondering that as an end user say for a java web-site without applets, would the user of the website be required to install java in his/her machine?
Because it seems that in the case of Servlet and Jsp all execution is done at the servers end and only the result is sent back to the user in html format.
Please correct me if I’m wrong.
As you suspect, Java is only run on the servers. It is the language that accepts an HTTP Request and processes it, issuing out an HTTP Response. As with most good coding practices, this means that the server program is returning a response that is, essentially, text. The implication here is that you can write the server in any sort of programming language, or set of languages, without the browser needing to know what or why.
Thus, the browser is agnostic to the languages you use on the server.
Java Applets are different; they are compiled Java code that is downloaded by the client and run inside a local JVM. For this to work, the client requires Java to be installed. Applets can be quite small – invisible even – and thus malicious sites can use them on unsuspecting browsers to do wonky things. For this reason people are concerned about Java security holes that would allow applets to do more than they should.