Justyna Horwat's Blog

Cool New Features in JSP 2.0

Earlier this week I was able to attend the JSP 2.0 session and learn about its cool new features. There are so many changes that it certainly warrants the major version number upgrade.

Mark Roth, the "wizard" of JSP, began his presentation with a funny pink brains and pacifiers analogy. The brains and pacifiers represented the different user types. He had a table with brains and pacifiers that amused me immensely. The table showed how the learning curve of JSP 2.0 is lower than JSP 1.2.

One of the cool new features that's available in JSP 2.0 is an integrated expression language. JSP Standard Tag Library (JSTL) 1.0 introduced the concept of the EL but it was limited to only the JSTL tags. With JSP 2.0 you can use the EL with template text. You even get programmatic access via javax.servlet.jsp.el. This powerful feature has now been truly unleashed.

JSP 2.0 also makes it much easier to write custom tags. You now get simple tag extensions with a simpler tag handler API and you only have to implement one easy doTag() method. Simple.

Another thing that I found really cool is the new concept of tag files. These tag files allow you to quickly write simple tag extensions using only jsp syntax. This really empowers page authors who may not be familiar with java development. Now you only need to just drop a .tag file in /WEB-INF/tags and you're done.

There are many more new features available in JSP 2.0. Download it and give it a whirl.

Comments

• Tag Files
  The JSP Tag Files do look very powerful. Thanks for the pointer!

  Posted by: js on June 12, 2003 at 11:30 PM

• JSP 2.0 issues
  The new JSP 2.0 features do indeed look very interesting. However, they won't be of much use to me until all the vendors do some serious optimizations. Taglibs are still slow in many appservers and the new query language will likely use introspection. It simply won't scale to a high volume site. :(

  -Matt

  Posted by: mattjive on June 16, 2003 at 10:18 PM

• New feature in JSP 2.0
  There is one stuff that I think very usefull in JSP 2.0 : you can define dynamic attributes.

  One think it should be included is a method "setTagName" then it would be possible to use the same bean to implement several tags.

  Posted by: phoforjob on June 17, 2003 at 03:11 PM

• tag libraries without prefix
  If tag libraries were enabled to not use a prefix, we could overwrite the standards HTML tags like INPUT or SELECT to our tag libraries.

  Then we could use our own HTML editor to create dynamic JSP pages without needing to add a custom tag.

  I dont know why Its not possible, but today I'm doing it with Tomcat. I just changed the JSP compiler to accept tag libraries without prefix

  Posted by: ebengtso on June 18, 2003 at 01:59 AM

• Another suggestion to the new version
  TLD attribute
  
  Today, we do like this

  attribute
  false
  true

  
  My suggestion is add one more parameter to the attribute:

  attribute
  attributeinbean
  false
  true

  The will be responsible to map the Bean Field(Attribute) to the JSP attribute
  
  A sample
  
  JSP:

  
  Tag class:
  private String attributeinbean;
  
  public void setAttributeinbean(String string) {
  attributeinbean = string;
  }
  
  public String getAttributeinbean() {
  return attributeinbean;
  }
  
  In this case, you can write in the JSP with a name, and in the bean, with other name. It will resolve its problem:
  
  JSP:
  = Error
  Today you can not do it in JSP Tag Libraries, because of the setter and getter class.
  
  Take a look in one more sample:

  class
  clazz
  false
  true

  
  JSP:

  
  Tag class:
  private String clazz;
  
  public void setClazz(String string) {
  clazz = string;
  }
  
  public String getClazz() {
  return clazz;
  }
  

  Posted by: ebengtso on June 18, 2003 at 02:01 AM

• tag libraries without prefix
  I would like to use tags without prefix. How did you do that?

  Posted by: lcmuniz on April 27, 2004 at 12:03 PM

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