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Tapestry 5.2: Improved Query Parameter Support

Posted by: Howard Lewis Ship on 06/24/2010

I just checked in some very nice changes for Tapestry 5.2; you can now easily store data about a page in the URL as query parameters:

  @QueryParameterMapped
  private String name;

By annotating a page (not a component!) field this way, the field will be mapped to the query parameter "name". When a page render link or component event link for the page is created, the current value of the field will be added as parameter "name". When that link is triggered to form a request, the parameter will be read and the field updated from the query parameter value.

It isn't limited to strings ... it uses the whole ValueEncoder machinery so that you can encode numbers or even Hibernate entities (represented in the URL as their primary key).

Cool stuff, if I do say so myself. Even I'm still learning how to flex the massive amount of meta-programming muscle that Tapestry provides. It turns out that the combination of component method advice with custom events triggered on the page can do some really sophisticated things!

Howard Lewis Ship's complete blog can be found at: http://tapestryjava.blogspot.com

About Howard Lewis Ship

Howard Lewis Ship is the creator and lead developer for the Apache Tapestry project, and is a noted expert on Java framework design and developer productivity. He has over twenty years of full-time software development under his belt, with over ten years of Java. He cut his teeth writing customer support software for Stratus Computer, but eventually traded PL/1 for Objective-C and NeXTSTEP before settling into Java.

Howard is respected in the Java community as an expert on web application development, dependency injection, Java meta-programming, and developer productivity. He is a frequent speaker at JavaOne, NoFluffJustStuff, ApacheCon and other conferences, and the author of "Tapestry in Action" for Manning (covering Tapestry 3.0). Lately, he's been dipping his toes into alternate languages, including Clojure.

Howard is an independent consultant, offering Tapestry training, mentoring and project work as well as training in Clojure. He lives in Portland, Oregon with his wife Suzanne, and his son, Jacob.

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