What is Difference between JSP and Facelets

Here we will find some features of  Facelets and JSP (Java Server Page) to find out some differences between Facelets and JSP.


 Java Server Pages (JSP) is java technology that enables Web developers and designers to rapidly develop and easily maintain, information-rich, dynamic Web pages that leverage existing business systems.  JSP technology separates the user interface from content generation, enabling designers to change the overall page layout without altering the underlying dynamic content.

Facelets is the first non-JSP page declaration language designed for JSF (Java Server Faces) which provided a simpler and more powerful programming model to JSF developers as compared to JSP. It resolves different issues that occur in JSP for web application development.

In the below table, a difference between Facelets and JSP is shown by comparing different features of JSP and Facelets.


 Feature Name
 JSP
  Facelets
Pages are compile

A Servlet that gets executed each time the page renders. The UI Component hierarchy is built by the presence of custom tags in the page.

An abstract syntax tree that, when executed, builds a UI Component hierarchy

Handling of tag
attributes
All tag attributes must be declared in
a TLD file.
Tag attributes are completely dynamic and automatically map to properties, attributes, and Value Expressions on
UI Component instances
Page template
Not supported directly. For templating must go outside of core JSP
Page templating is a core feature of Facelets
Performance
Due to the common implementation technique of compiling a JSP page to a Servlet, performance can be slow
Facelets is simpler and faster than JSP
EL Expressions
Expressions in template text cause unexpected behavior when used in JSP
Expressions in template text operate as expected.
JCP Standard
Yes, the specification is separate from the implementation for JSP
No, the specification is defined by and is one with the implementation.

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