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Metro, jMaki & JRuby/GlassFish Q&A from a Preso - Toronto & Montreal

Posted by arungupta on November 28, 2007 at 7:03 AM PST

I presented on Metro,
jMaki and

at a partner meeting on Nov
21 in Toronto and Montreal (yeah, both cities in the same day). That
makes it 3 cities (the first one being
Seattle) total for now!

I've given multiple talks all over the world to different types of
audience but this was my first experience in terms of talking for 3
hours in the morning, flying to another city and then repeating the
sessions. GlassFish (both v2 and
v3), NetBeans IDE and Windows Vista
behaved properly through all the demos. And my talks are typically demo
intensive so it was fun! I enjoyed the overall experience (talking,
demos, flying) :)

As always, the fun part was interaction with the audience and I
always learn something new every time. And, in order to share the
knowledge with you, here is the consolidated list of questions from both
the cities:

  1. How much Ajax/jMaki support is available in Portal ?

    The Portal Pack plugin for NetBeans can support JMaki 1.0 for
    building JSR 168 or JSR 286 portlets that use jMaki widgets. There
    is no other explicit support on the Portal server for JMaki.

    The portlets using jMaki widgets can be deployed on the
    Portal Server
    and they should work without any issues. The only
    catch is that a slight configuration is required to get these
    portlets to work with the Portal's Ajax container. This is to work
    around the cross-domain Ajax restrictions of the browser.
  2. What is the frequency of adding wrappers of newer version of
    toolkits, specifically Dojo toolkit ? Can I add/create the wrappers
    myself ?

    Frequency depends on the toolkits. Dojo revs about every 6 months
    with the first major rev just last month. Anyone can create and add
    wrappers to the palette in NetBeans as

    explained here
    . Adding to Eclipse is on a per-web app basis and
    it will be enabled on palette-basis in the near future.
  3. What level of browser support is available for jMaki,
    especially for the ones that are not mainstream ?

    Here is the list of supported browsers from
    jMaki's website:
    • IE 6 and 7 on Windows XP and Vista
    • Firefox 1.5 and 2.x on Solaris, Linux, Windows XP/Vista
    • Safari 2.x and Firefox 1.5 on Mac OS

    Unofficially jMaki runs on:
    • iPhone
    • Opera 9.2+
    • Opera Mobile
    • Older versions of Netscape

    Although the jmaki framework will work on these browsers some
    widgets may not work (such as those that use SVG) depending on
    the browser.

  4. When will a .NET version of jMaki be available ?

    If the demand is great we will be more than happy to work to make a
    version available. The greater the demand the sooner we could do
    this. If there is interest in the developer community on starting
    work on a .NET version we could accelerate this process. Please

    file an RFE
    if you are interested.
  5. Can the jMaki widgets be rendered to Flash ?

    Absolutely. We previously used some Flash Yahoo Maps and we use
    Flash for Sound. We are looking at having more media based widgets
    and it's only a matter of hours in the day that are slowing us down.
  6. Does jMaki work with Ajax4J and DWR ?
    jMaki works fine with DWR find a sample app here:


    As for Ajax4JSF (Ajax4J seems to not be active) we should
    work fine as jMaki widgets can be exposed as fully qualified
    JSF 1.1 or dynamic faces components. We also work with
    Facelets (see the jMaki samples for more).

And now for the Metro session:

  1. Is there any tooling for adding Security, Reliability and Transactions
    for Contract-First development ?

    Yes, this is explained

  2. Can the apps using JDK 1.4 as the deployment environment use
    any of the Metro capabilities ?

    Yes and No :) No because Metro programming model uses annotations
    heavily and that feature is available in Java SE 5 onwards. Yes
    because once the production environment is upgraded to Java SE 5 (it
    should work because of backwards compatibility, always good to check
    though ;) then you can develop your applications using the JDK 1.4
    and deploy them on the upgraded production environment.
  3. How the Web service messages generated by Metro be logged ?

    The different options to log Web service messages in Metro are

And finally for the JRuby-on-GlassFish session:

  1. Other than simplicity and productivity, why should I use
    JRuby or Ruby at all ?

    Rails is the main reason
    for Ruby to gain popularity. And JRuby provides the simplicity of
    Ruby along with power of Java libraries.
  2. Can the number of JRuby instances created by GlassFish be
    configured ?

    Yes, it can be configured as defined

  3. With JRuby 1.0.2, there are significant performance
    differences between Ruby, Java and JRuby. What is being done to
    address that ?

    The recent releases of JRuby are much more better performing so it's
    recommended to use a more recent release. And with some

    JRuby Performance Tweaks
    the performance is at par with C Ruby (MRI).
    Also see

    JRuby on Rails Fast Enough
    for performance benchmark results.


Feel free to ask any other questions in

Metro Forum
jMaki Forum
GlassFish forum
or JRuby user


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