Simon Brown's Blog

Professional JSP, 3rd Edition (Apress) to be released soon

Well ... it looks like our work on Professional JSP, 3rd Edition (previously titled Professional JSP 2.0, and now to be published by Apress) is almost at an end. It's currently slated for a September release and Amazon is now listing it, albeit with an incorrect authors list. I imagine that Sam, Dave, Matt and the other authors are looking forward to this being released as much as I am.

If you've not seen it, the JSP 2.0 specification provides some great new features that I think will really change the way that JSP-based web applications are developed in the future. Finally we have a native JSP expression language and this makes building templated pages much easier, without leaving the JSP environment. Another big improvement is the introduction of tag files and simple tags. These are both ways to easily build custom tags with JSP syntax or Java code respectively. Here's an early excerpt from one of my chapters back when in the days when it was going to be published by Wrox. There's some great new stuff coming our way and I can't wait for Tomcat 5 to become rolled out and production ready.

Comments

• Code/Markup seperation?
  Last I checked JSPs (which was quite some time ago) they made the fatal mistake to assume that I (the programmer) was creating html pages.
  Has this situation changed? Is it possible to have a clean seperation of logic and markup in the 2.0 spec?

  And related; can the server (servlet) manage what is available in JSP, so when I write a correct server pages can't compromise any security measures I put in the server?

  Love to hear how much JSPs have grown!

  Posted by: zander on August 06, 2003 at 09:22 AM

• Code/Markup seperation?
  I remember seeing JSP unveiled at one of the JavaOne conferences several years back (1999/2000?) and, as they were going through the presentation, I was sitting back in my seat thinking, �on no, why on earth would I want to build web applications like this�. You�re right, the early versions of JSP didn�t enforce or allow much of a separation of concerns and all sorts of different types of logic were just thrown together on the page. Fast forward to recent versions of JSP and it�s a whole different story. Of course, you can still build JSP-based web applications in the same way as before, by writing HTML content and embedding lots and lots of Java code. This works, but it will lead to a maintenance nightmare. However, there are now several ways in which to build JSP-based web applications that allow a tidy separation of concerns. One of these is to adopt an MVC-style (aka model 2) architecture to your web application where JSP pages are simply used to render information back to the users. All of the hard work is performed by controller component(s) that operate on the data contained within the model. Another option is to use JSP custom tags (taglibs) to wrap up recurring functionality and expose this as XML tags that are used on the page. In any web application you�ll typically find a mixture of both. After all, some logic will be related to the process of servicing the request (e.g. updating customer details), while some will be associated with presenting information back to the user (e.g. formatting). JSP 2.0 makes much of this easier still because of the introduction of the expression language and the simpler ways in which custom tags can be built. With JSP 2.0, I think we�ll start to see many more JSP pages that are completely free from Java code, and hence logic.

  Posted by: simongbrown on August 07, 2003 at 03:38 AM

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