Saturday May 03, 2008

JRuby 1.1.1, Rails 2.0.2, Warbler now in GlassFish v2 Update Center

Vivek updated JRuby module in GlassFish v2 UR2 Update Center. It now contains JRuby 1.1.1 + Rails 2.0.2 and Warbler (instead of Goldspike) for packaging the app.

Read all details on how to download, install and getting started here. The image below shows a snapshot of Update Center with the latest module selected:

After following all the steps (had to manually set executable perms on jruby-1.1.1/bin/jruby), your application is now hosted at "http://localhost:8080/HelloWorldRailsApp/say/hello" and shows the following output:

The generated "HelloWorldRailsApp.war" is approx 8.5 Mb and could quickly grow depending upon the gems installed and other factors. As an alternative, you can consider shared deployment as explained in each sample's GLASSFISH_README.txt.

Send us feedback at Forums or webtier@glassfish.

Technorati: rubyonrails jruby ruby glassfish updatecenter

Monday Apr 21, 2008

JRuby and GlassFish v2 - Another successful deployment @ WorldxChange Communication NZ

From proof-of-concept to production in 8 weeks, WorldxChange Communication NZ's online billing system is another succes story of JRuby and GlassFish v2. The portal is designed solely using NetBeans 6.1 IDE.

Here are some of the quotes from the completed questionnaire:

From my perspective, the main advantage was that I could deploy my JRuby project war file directly to Glassfish, allowing me to develop and test our online ViewBill portal using a production grade, scalable web server.

From a geek perspective, we love that Glassfish combined with JRuby and allowed us to integrate many different disparate systems to create a seamless interface for our customers to use.

started using the Glassfish v3 gem for final testing of new code releases and to check functionality prior to production deployment.

I do not believe that I could have developed this project any faster using different toolsets or technologies and have been massively impressed with the combination of Glassfish and JRuby.

Read more details here.

Rails powered by the GlassFish Application Server explains why to use GlassFish for powering your Rails applications.

You can find all all about JRuby and GlassFish efforts on the GlassFish wiki or JRuby wiki.

Technorati: glassfish netbeans rubyonrails jruby ruby stories

Friday Mar 21, 2008

Ajax World East 2008 - Day 2 Report

I delivered my Maki as an Ajax Mashup Framework talk and the slides are available here. Lots of attendees came by afterwards and told me that they enjoyed the demo. The talk showed how jMaki Webtop provides a lightweight mashup framework that runs in the browser. Here is a pictorial representation of the demo shown:

GlassFish jMaki Webtop

jMaki Webtop is basically a jMaki widget that can be embedded in a JSP or PHP page. This widget provides the framework for managing widgets and users, ability to persist the Webtop on client-side using Google Gears or server-side using backend database, layouts and other functionality. In JSP case, the widget uses JPA for performing all the CRUD operations with the back-end MySQL database. The resulting WAR file is deployed on GlassFish (can be any other Servlet container as well). If you are interested in a Java version of Webtop then the recommended path is:
  • Create services & widgets using NetBeans
  • Deploy them on GlassFish
  • jMaki webtop for widget deployment & customization
It really is an evolution of jMaki - using all the infrastructure that has built over 2 years. You can experience it yourself at which is running a PHP version of the app. See the coverage here. The code will be available soon!

I attended few more talks and took notes in some of them to share:
See below for notes from some of them.

Can we fix the Web ?

This was an early morning talk (7:30am) and I reached few minutes late. But it was basically talking about JavaScript vulnerabilities such as
  • Script injection
  • No difference between user & guest scripts
  • Scripts exempt from same-origin policy
  • No modularity (global access to everything on the page)
And also DOM vulnerability because every node in the tree has access to every other node. This lacks modularity and causes a potential security risk.
Doug recommended 3-step plan to fix the Web:
  • Safe JavaScript subset
    • provides a safe subset of JavaScript that removes all features that are unsafe or suspect such as no global vars or functions
    • Google Caja & Cajita provide a similar subet but they use transformation instead of validation
  • Minor browser improvements
    • Scripts are exempt from same-origin policy. This allows a dynamic <script> tag to make a GET request from a server. Instead use JSONRequest (part of
    • ES4 (the upcoming JavaScript standard) is not good enough because it maintains backwards compatibility and adds complexity.
  • Major browser improvements
    • Replace JavaScript & DOM in browsers. The approach is to start with JSLint and add safe features as required.
    • The Object Capability System (where objects are given explicit access to be used) needs to be enforced to make it secure.
In Doug's opinion, if the Web is not fixed then JavaFX, Silverlight & AIR (all vastly superior but lacking adoption) will displace the web.

The second talk was on Accelerate Ajax development with Appcelerator by Appcelerator CEO.

The talk started with a "not too long back" introduction of the technology space. Well, it started with 1991 and the timeline (and associated technology advances in that year) kept shuffling 1995, 1989, 2001 .... and so on. Jeff talked about how/why Tim Berners Lee invented WWW and covered a myriad of terms after that including but not limited to - Web 1.0, Netscape, Mosaic, marc Andreeeseen (sp?), Java, java Web Start, Applets, W3C, CGI, J2EE, JCP, C#, JBoss, SOA, JavaFX, Silverlight, AIR and many others. For a 50 minute talk, that was quite a long introduction.

After that introduction, he word "Ajax" was mentioned almost 30 minutes (8:51am to be precise) in the talk. And then the word "Appcelerator" was mentioned at 9:06am. Finally, I realized that I'm in the right talk ;)

Appcelerator like to pitch themselves as RIA + SOA company and allows true decoupling of the rich client from it's services. Their services is very similar to jMaki but they use event handling + Ajax + DHTML to achieve it. They also run on Ruby, PHP, Java and other languages.

All in all, it was a good walk through the memory lane!

The next one was REST & Ajax Reconciled.

The talk explained the basic concepts of REST - Resource, URI, Representation, URL & Methods (GET, PUT, POST & DELETE). It also explained the idempotency and safety of each method type. Overall a good decent introduction.

Then it explained the limitations with current web-based forms:
  • The URIs in the action attribute cannot be changed dynamically
  • Most browsers recognize only GET/POST methods
  • Limited ecodings - for example generating JSON encoding requires extra work.
It provided a REST framework checklist:
  • Does it have resource-based approach ?
  • Acknowledges existing of representation ?
    • need multiple of them
  • Solid engineering & community support ?
The three frameworks discussed in the talk were:
  • Apache Cocoon - based on XML pipelines & URL patterns, powerful but steep learning curve
  • RESTlet - Like Servlet for REST, good for existing model
  • Apache Sling - Based on JCR with server-side scripting support
The talk did not mention anything about Jersey which is turning out to be a great implementation and very well meets all the critieria mentioned above.

The speaker recommended Apache Sling with µjax for all REST + Ajax needs. But I'd strongly encourage you to have a look at Jersey. The JSON representation generated out of Jersey can now be directly consumed by jMaki as described here - a true combination of REST & Ajax :)

And then the last talk where I took notes is Understanding the Top Web 2.0 Attack Vectors. I'll provides notes from the last 5 slides of the talk which essentially captured the essence. These slides talked about fundamental issues with Ajax and described concerns and possible attacks in each issue. I'll need to understand some of these attacks better myself but at least I have a list to begin with :)

Here you go:
  • Client-side
    • Concerns
      • Transparency
      • Cross-domain communication
      • Exposed business logic (View Source)
      • Local & Offline data storage
    • Attacks
      • Cross-site scripting, DNS Rebinding
      • Business logic bypass
      • Variable tampering
      • Protocol hijacking
      • Function clobbering
      • JavaScript hijacking
  • Protocols
    • Concerns - new protocols on top of HTTP
      • SOAP
      • XML-RPC
      • REST
    • Attacks
      • Traditional
        • Man-in-the-middle
        • Spoofing
      • Recursive Payloads
      • Schema Poisoning
  • Information Sources
    • Concerns
      • Integrity
      • Transient
      • Diverse (RSS, Blogs, Email, ...)
    • Attacks
      • Untrusted content
      • Poisoned Cache (HTTP Response Splitting Vulnerability)
      • DNS Issues
  • Information Structure
    • Concerns - Variations of data structure
      • RSS
      • Atom
      • JSON
      • Serialized data
    • Attacks
      • Malicious injection
      • Parser implementations
  • Server-side Issues
    • Concerns
      • Architecture Weaknesses
      • Multiple languages & implementations
      • Increase & fragmented attack surfaces
      • Unknown request origin
      • Authorization & Authentication in complex environment
    • Attacks
      • Traditional
        • Information disclosure, Logical attributes, Denial-of-service
        • Command Injection
          • LDAP, SQL, XPath etc.

OpenAjax Alliance talk about Gadgets & Widgets was nice. The alliance is working on creating standards for widget metadata, communication across widgets and other similar tasks. The goal is to enable successful adoption of open and interoperable Ajax-based Web technologies.

Dave Ferraiolo (from OpenAjax) particularly expressed thanks to jMaki for deriving the first set of Open Ajax Data Model specs from jMaki data models.

That's it!

Check out some of the pictures:

The complete album is available at:

I had to leave at the end of Day 2 because of unfavorable health condition. But I'm glad at least I could deliver my talks :) Now I need to be back-in-shape before my upcoming trip next Tuesday!

Technorati: conf ajaxworld newyork glassfish netbeans ria sun web2.0 jmaki

Tuesday Mar 18, 2008

Ajax World East 2008 - Day 1 Report

Ajax World East 2008
started earlier today.

I delievered my "Web 2.0 Application development using jMaki" and the slides are available here. There were several demos shown in the talk (using NetBeans and GlassFish) and they are all accessible at the links mentiond below:
Several other related demos are available here. Luckily I could deliver without much hassle inspite of having a high fever and cough! I hope I can hold at least until tomorrow morning when the big preso is scheduled @ 11:35am.

Anyway I attended 3 more talks today and took notes to share:
See below for notes from each talk.

The first talk I attended was: Picking the Right Technology for Enterprise Rich Internet Applications. I got little late and the session was packed with attendees standing way outside the room so I joined them.
The session talked about AIR, Silverlight & JavaFX as three possible technologies for Enterprise RIA. Per the talk, here are the basic criteria for RIA tools requirement:
  • Seamless deployment on client
  • High penetration of runtime
  • Web browser independence
  • Fast client/server communication protocol
  • Robust security
Of course, this session was given in Ajax World so pros/cons of Ajax were dicussed:

Pros of Ajax Cons of Ajax
No deployment required Ajax apps are browser depdendent
100+ Frameworks 100+ Frameworks
Open Source, no need to purchase software license Expensive due to long cycle, skilled developers demand top rate
JavaScript is an interpreted language, entire source code can be viewed using "View Source"
Network communication speed is not optimizedf for Ajax requests

And then basically it talked about the three technologies and their pros & cons are well captured in the slides.

The second session I attended was Performance Tuning your Ajax Applications. This was an interesting session and I learned a few tricks. Interstingly we have implemented quite a few of these performance enhancements in jMaki already.

Improving the performance of Ajax applications require tuning the following parameters:
  • Number of requests
    • Reduce number of JavaScript files that are loaded. This is the most important since each request to the backend adds extra cost. Even when the scripts are cached, the browser still makes a request (unless Since-Modified header is set correctly).
    • Typical approaches are to concatenate the files at dev time or at runtime based upon request.
    • Dev time approaches
      • Ant - concat all JS files using <concat> task
      • Dojo - Run Rhino over all provide/requires and then concatenate the files
      • Command-line
    • Run time approaches - Concatenation happens depending upon the request. Cons are:
      • Server-side dependent
      • Makes it harder to distribute code
      • Server is loaded as concatenation happens on server (mitigated with caching)
      • Works for <15 JS files
      • Does not track dependency
  • Size of requests
    • Remove white spaces and comments (Packer, Dojo, YCompresser, SafeCompress, ShrinkSafe are some of the tools)
    • Shorten the variable names
    • Gzip the code
    • Semicolon is optional but needed if you remove EOL (careful when compressing the code)
      • Drastically reduces the file size (e.g. Apache XAP reduced the file size from 330 kb to 70 kb)
      • Lots of gzip tools
      • Need to put appropriate headers so that browsers recognize gzipped content
    • Coding Style
      • Single line "if" and "for" do not need "{ }"
      • Combine var declarations into a single var such as var x=1, y = 2;
      • Use JavaScript style object
  • Time of requests
  • Time of initial code completion
    • Minimize the time that is executed @ start up
    • Bring the data once the initial page is loaded
    • Show images telling users that something is going on
      • Distracts user from the time it's taking
  • Other tips
    • Don't write your own parser  - use the native parsers
    • "If" statement optimization
    • Use the native facilities like getElementById() or getElementByTagName()
    • Consider different approaches of DOM creation
      • Tail Recursion
      • Setting the value in innerHTML
    • Consider JSON over DOM for object graph traversal - JSON could be much faster
Similar tips can be used for CSS as well.

My third talk of the day was Performance Paradigm of a Mashup World.

This talk given by Vice President of Webmetrics and laid a special emphasis on "Collaborative Monitoring" for performance measuring any mashup. This process involves not only monitoring your own application, but also setting up agents that measure performance with other services being invoked in the mashup, their further partners and so on. It also talked about a layered approach of using:
  • Standard monitoring - HTML page load time, DNS request processing time, etc.
  • Pixel Mapping monitoring - required mainly for GUI intensive application
  • Web services monitoring - Used for partner monitoring
This was further clarified using a 6-step process:
  • Know your apps
  • Learn where the points are in your ecosystem
  • Measure your perspective
  • Monitor your APIs
  • Collaborate within your organization
  • Collaborate with your partners & customers
That's it!

Check out some of the pictures:

The expo hall opens tomorrow and Sun's booth is right between the ballroom and the main door to expo hall, can't miss us ;)

The complete album is available at:

The Internet connection at the Roosevelt hotel is painfully slow inspite of charging $14.95/night where as most of the "modern" hotels offer free wireless :(

Technorati: conf ajaxworld newyork glassfish netbeans ria sun web2.0 jmaki

Monday Feb 18, 2008

Screencast #23: Social Software for GlassFish - Blogging, Tagging & Content Rating

Social Software for GlassFish
Social Software for GlassFish provides an integrated suite of Blogging, Tagging and Content Rating on GlassFish. More details about this suite are available here.

This screencast explains how this integrated suite of software can be easily downloaded using GlassFish Update Center, how different components are seamlessly integrated and can be used.

Enjoy it here!

More screencasts focused on each individual topic are available here.

An offline version (downloadable zip file) of this screencast is available here. A complete list of screencasts is available on GlassFish wiki.

Technorati: screencast web2.0 social glassfish roller slynkr blogging tagging contentrating

Monday Jan 28, 2008

JRuby-on-Rails deployed on GlassFish - Success Story

There are several reasons you may deploy JRuby-on-Rails application on GlassFish:
  • Java EE is a long tested deployment platform and GlassFish is Java EE 5 compliant.
  • GlassFish "green" deployment model - just create a WAR and dump it in autodeploy directory. Typical Rails deployment requires to spawn multiple Mongrels, front-ended by Apache and then manage them through Capistrano.
  • Java EE and Ruby-on-Rails applications can be easily integrated in one container. This allows to host JRuby-on-Rails applications in organization who have already made investment in Java EE.
  • GlassFish comes with out-of-the-box clustering and high-availability support. Rails applications can certainly benefit from them.
  • GlassFish offers database connection pooling allowing you to reuse your database connections.
  • Last, but not the least, JRuby-on-Rails can leverage the extensive set of Java libraries.
I'm working on an article that will explain each of these in detail. In the meanwhile here is a live success story. (provides a public place for Sun employees to store large media files) released their version 2.0 - completely rewritten using JRuby-on-Rails and deployed on GlassFish. Igor has good details is his blog. Here are some excerpts:

Development environment: NetBeans 6, Mercurial plugin, WEBrick, GlassFish v2 UR1, MySQL
Deployment environment: 2 Load-balanced T2000, Solaris 10, Sun Java System Application Server 9.1 U1, JDK 6, MySQL

He has explained the pain points and areas of improvements very clearly. We are aware of the performance problems and already working on them!

Let us know if you have had success with deploying JRuby-on-Rails on GlassFish. Read all GlassFish success stories.

UPDATE (Feb 8): Mediacast deployment diagram is now available here.

Technorati: glassfish netbeans jruby rubyonrails mediacast stories

Thursday Jan 17, 2008

Travel Plans for Q1 2008 - Fairfax, Little Rock, Orlando, Hyderabad, New York, Las Vegas

Here are my tentative travel plans for the next 3 months:
Event Dates Location
Partner Preso Jan 23 Fairfax, Virginia
Partner Preso Jan 24 Little Rock, Arkansas
Rails for All Feb 8-9 Orlando, Florida
Sun Tech Days Feb 27-29 Hyderabad, India
Ajax World Mar 18-20 New York
The Server Side Java Symposium Mar 26-28 Las Vegas

Stop by and say hello if you are at any of the locations! Also, drop a comment or shoot me an email if you'd like me to talk to your local Java User Group about GlassFish provides an open-source, production-quality and Java EE 5 compatible Application Server. We can also drill down on Metro or jMaki with numerous working samples. If you host or attend a Ruby Meetup then we can also talk about JRuby on GlassFish.

Let me know if you'll be interested in running a few miles together :)

Technorati: glassfish metro jruby ruby jmaki meetup jug webservices web2.0

Monday Dec 31, 2007

Screencast #Web11: Travel Map - Another Real-life app using jMaki & Jersey

In my role of Technology Evangelist, I get the opportunity to meet a lot of community (folks like you :) all around the world. In the year 2007, I represented GlassFish (and related technologies - Metro, jMaki and Jersey) at multiple conferences. This blog introduces a  new real-life application that plots all the places I visited this year on a jMaki-wrapped Google Map widget. Clicking on the marker shows more information about the event such as dates and the blog entry covering the event.

Play the video below to see how the application looks like.

Here is the architecture of this application:

travel map architecture

It consists of a server-side and a client-side applications - developed as NetBeans projects.

  1. Server-side project - A RESTful Web service endpoint that provides resource represenations for all the events attended and associated meta information such as date and blog URLs. This endpoint is created using Jersey.
  2. Client-side project - A jMaki-enabled Web application that consumes the representations generated by the RESTful Web service and plots the information on a jMaki-wrapped Google Map widget.

Both the server-side and client-side are deployed on GlassFish.

This is only a sample application so optimizations are certainly possible and corner cases (such as no blog entry for a particular visit) are not accounted for. But the application still demonstrates the concept. The fully built application looks like as shown below:

Arun's Travel Map 2007

My first presentation in this role was Sun Tech Days Atlanta (highlighted in the image). This application generates an interactive Google Map so feel free to zoom in/out and click 

And one last thing before we build the application. Here is the list of technologies and associated concepts used to build this application:

  1. Jersey
    1. Shows an example of how RESTful Web services can be easily generated from JPA Entity Classes.
    2. Shows how all the resource representations (instead of reference to individual resources) can be returned by a Jersey endpoint.
  2. jMaki
    1. Shows how to consume XML data from an external service (RESTful Web service endpoint) in this case.
    2. Shows how the underlying data model of a widget (Google Map in this case) can be accessed and manipulated.
  3. GlassFish
    1. All the applications are deployed on GlassFish - implicit in the development/deplyment process through seamless integration with NetBeans.
  4. NetBeans 6
    1. Used for generation of RESTful Web services from JPA Entity Classes.
    2. Used for generating/deploying jMaki projects and drag-and-drop of jMaki-wrapped widgets.
  5. JavaScript Closures - to persist the state for asynchronous callback functions
  6. JavaScript DOM processing - to process the XML data received from Jersey endpoint.
  7. Google Maps API
    1. Generate meaningful markers on each location
    2. Populate Google Map from a RESTful Web service endpoint
  8. Java Persistence API - to retrieve data from the database.

And finally, lets build this application. Lets build the RESTful Web service endpoint project first.

  1. Create and Populate the Database
    1. In the NetBeans IDE, go to Services tab, and connect to the database with URL "jdbc:derby://localhost:1527/sample [app on APP]" (right-click and select "Connect...").
    2. Right-click on this database and select "Execute Command..." and create a table by giving the following command:

      create table EVENTS (id int GENERATED ALWAYS AS IDENTITY,
                          event_name varchar(255),
                          dates varchar(20),
                          venue varchar(255),
                          blogs varchar(2056),
                          PRIMARY KEY (id))

      Notice, the "id" column is marked as IDENTITY that instructs the database to auto generate the values for this column and increment by 1 (default) for each row. This column is also marked as the primary key.
    3. Again right-click on the database and select "Execute Command..." to add data to the table by giving the following command:

      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('SunTech Days - Atlanta', 'Jan 16 - Jan 17', 'Cobb Galleria Center, Two Galleria Parkway, Atlanta, Georgia, 30339', '');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('jMaki Day', ' Feb 23', '4150 Network Circle Santa Clara, CA 95054', '');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Ajax World - New York', 'Mar 19 - Mar 21', 'The Roosevelt Hotel, 45 E 45th St, New York, NY 10017', '');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('The Server Side Java Symposium - Las Vegas', 'Mar 22', '3355 Las Vegas Blvd. South Las Vegas, NV 89109', ',');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('JavaOne - San Francisco', 'May 7 - May 11', 'Moscone Center, 747 Howard Street, San Francisco, CA 94103', ',,,,,,,,,');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Rails Conf - Portland', 'May 17 - May 20', '777 NE MLK, Jr. Blvd. Portland, OR 97232', ',,,');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Google Developer Day - San Jose', 'May 31', '150 W San Carlos St San Jose, CA 95113', '');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Mashup Camp - Mountain View', 'Jul 18 - Jul 19', 'Computer History Museum, 1401 N Shoreline Blvd., Mountain View, CA 94043', ',');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('OSCON - Portland', 'Jul 23 - Jul 27', '777 NE MLK, Jr. Blvd. Portland, OR 97232', '');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('JRuby Hack Day - San Francisco', 'Aug 8', '1201 8th St, San Francisco, CA 94107', ',');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Rich Web Experience - San Jose', 'Sep 6 - Sep 8', '170 S Market St, San Jose, CA 95113', ',');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Rails Conf Europe - Berlin', 'Sep 17 - Sep 19', 'Maritim Pro Arte, Friedrichstrasse 151, 10117 Berlin', ',,,');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Sun Tech Days - Rome', 'Sep 24 - Sep 25', 'Meliá Roma Aurelia Antica, Vía Aldobrandeschi, 223  Rome ITALY  00163', ',,');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Sun Tech Days - Milan', 'Sep 26 - Sep 28', 'ATA Hotel Quark - Via Lampedusa 11/a 20141 Milano, Italia', '');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Mid West Java Tech Days - Minneapolis', 'Oct 16', 'University of St Thomas, MPL 201, 1000 LaSalle Avenue, Minneapolis, MN 55403-2005', ',');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Mid West Java Tech Days - Chicago', 'Oct 18', 'Donald E Stephens Convention Center, 9301, W Bryn Mawr Ave, Rosemont IL 60018', ',,');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Silicon Valley Code Camp - Los Altos', 'Oct 27', 'Foothill College, Los Altos, CA', ',');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Sun Tech Days - Beijing', 'Nov 1 - Nov 3', 'Beijing International Convention Center, No.8 Beichendong Road Chaoyang District, Beijing', ',,,,,');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Partner Preso - Toronto', 'Nov 21', 'Toronto City Center', '');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Partner Preso - Montreal', 'Nov 21', 'Montreal City Center', '');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('GlassFish - Delhi University', 'Dec 3', 'New Delhi', '');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('FOSS.IN - Bangalore', 'Dec 4', 'India Institute of Science, Bangalore', ',,');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Partner Preso - Bangalore', 'Dec 4', 'Bangalore', '');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Partner Preso - Chennai', 'Dec 5', 'Chennai', '');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Partner Preso - Pune', 'Dec 6', 'Pune', '');
      INSERT INTO EVENTS (event_name, dates, venue, blogs) VALUES('Partner Preso - San Francisco', 'Dec 17', 'San Francisco', '');

      These SQL statements populate the database with details about my visits in 2007. If you'd like to develop a similar application highlighting your visits then you'll need to modify the VALUES clause to match accordingly.
  2. Create and Configure RESTful Web service endpoint
    1. Create a Persistence Unit as described in "Generating Entity Classes from Database" section in Getting Started with RESTful Web Services. Lets say the project name is "WebApplication3", package name is "events" and the table name to generate Entity classes is EVENTS. Take everything else as the defaults.
    2. Generate a RESTful Web service as described in "Generating RESTful Web Services from Entity Classes" section in Getting Started with RESTful Web Services.
      1. Add a new class EventsList in the events package as:

        public class EventsList {
          protected java.util.List<Events> events;

          public EventsList() {
            if (events == null)
              events = new java.util.ArrayList<Events>();

          public void add(Events name) {

          public java.util.List<Events> getValue() {
            return events;
      2. In service.EventsResource, change the method associated with GET to:

        public EventsList get() {
                EventsList eventsList = new EventsList();
                List<Events> list  = PersistenceService.getInstance().createQuery("SELECT e FROM Events e").getResultList();
                for (Events e : list) {
                return eventsList;

        This will ensure that all the resource representations are returned instead of a reference to the resource. Make sure to fix the imports.
That's it, our server-side project is now ready. "http://localhost:8080/WebApplication3/resources/events" now return a complete RESTful representation of all the rows from the database table EVENTS.

Lets build the client-side application next. Make sure jMaki plug-in in NetBeans IDE is already installed.
  1. In the NetBeans IDE, create a new Web project, enable "Ajax Framework" and choose the "Standard" layout for "index.jsp".  Lets say the project name is "WebApplication4".
  2. Drag-and-drop a jMaki-wrapped Google Map widget in the 'Main Content Area' and jMaki-wrapped Yahoo Button in the 'Sidebar Content Here'.
  3. Customise the widgets
    1. Add id="mymap" attribute to the Google Map widget. The updated widget looks like as shown below:

      <a:widget  name="" id="mymap"
               args="{ centerLat : 37.4041960114344,
                       centerLon : -122.008194923401 }" />

      will allow the Map widget to be accessed by name later.
    2. Add args="{label:'Plot Events'}" attribute to thes Yahoo button widget. The updated widget looks like as shown below:

      <a:widget name="yahoo.button" args="{label:'Plot Events'}"/>
  4. In glue,js, add the following code to \*onClick subscribe method:

    var url = jmaki.xhp + "?id=events";
    var _map = jmaki.getWidget("mymap").map;
    jmaki.doAjax({method: "GET",
        url: url,
        callback: function(_req) {          
            var xmlobject = (new DOMParser()).parseFromString(_req.responseText, "text/xml");
            var root = xmlobject.getElementsByTagName('eventsList')[0];
            var events = root.getElementsByTagName('events');
            for (var i = 0 ; i < events.length ; i++) {
                var event = events[i];
                var eventName = event.getElementsByTagName('eventName')[0].firstChild.nodeValue;
                var venue = event.getElementsByTagName('venue')[0].firstChild.nodeValue;
                var blogs = event.getElementsByTagName('blogs')[0].firstChild.nodeValue;
                var dates = event.getElementsByTagName('dates')[0].firstChild.nodeValue;
    var id = event.getElementsByTagName('id')[0].firstChild.nodeValue;
                var encodedLocation = encodeURIComponent("location=" + venue);
                var url = jmaki.xhp + "?id=yahoogeocoder&urlparams=" + encodedLocation;
                jmaki.myHandler(url, eventName, blogs, dates, id, _map);
  5. Add the following functions above the \*onClick subscribe method:

    // "Function closure" used from
    // Creates local copy of "marker" and "html" variables to be preserved for later use
    function createMarker(point,html) {
        var marker = new GMarker(point);
        GEvent.addListener(marker, "click", function() {
        return marker;

    // Function closure that preserves "eventName", "blogs", "dates and "id"
    // Gets the latitude/longitude from Yahoo Geocoding service and plots them on the map
    // Also creates meaningful markers
    jmaki.myHandler = function(_url, eventName, blogs, dates, id, _map) {
        jmaki.doAjax({url: _url,
            callback : function(req) {
                if (req.responseText.length > 0) {
                    jmaki.log("name: " + eventName);
                    var response = eval("(" + req.responseText + ")");
                    var coordinates = response.coordinates;
                    jmaki.publish("/jmaki/plotmap", coordinates);
                    jmaki.log("plotting " + eventName);
                    var latlng = new GLatLng(coordinates[0].latitude, coordinates[0].longitude);
                    var blogHtml = "";
                    b = blogs.split(', ');
                    for (i=0; i<b.length; i++) {
                        blogHtml += '<a href="' + b[i] + '">' + (i+1) + '</a>';
                        if (i<b.length-1)
                            blogHtml += ", ";
                    var txt = '<table>' +
                    '<tr><td>#' + id + ": " + eventName + '</td></tr>' +
                    '<tr>Dates: ' + dates + ', 2007</td></tr>' +
                    '<tr><td>Blogs: ' + blogHtml + '</td></tr>' +
                    var marker = createMarker(latlng, txt);
                } else {
                    jmaki.log("Failed to get coordinates for " + location );
  6. Add the following entry in Web Pages, resources, xhp.json:

    {"id": "events",

    assuming WebApplication3 is the project where RESTful Web service endpoint is hosted.
That completes our client-side web application as well. Now, either hit F6 (default key to Run the NetBeans project) and this will show http://localhost:8080/WebApplication4/index.jsp in the configured browser. Once you click on "Plot Events" button, all the markers on the Google Map are plotted.
Future Improvements
  1. If Jersey can return all the resource representations directly, then the workaround used above may not be required.
  2. Use e4x after <script type="text/javascript"> in index.jsp can be generated as <script type="text/javascript; e4x=1">.
  3. Build the client-side application using Rails once issue #309 & #310 are resolved.
    1. Once deployed as Rails application on WEBrick, create a WAR file and deploy on GlassFish.
    2. Try this application using GlassFish v3 gem.
  4. Embed Google Map in the blog entry.
An alternate title of this blog entry could've been "How I spent my winter break ?". But in order to keep the title inline with rest of other entries (keeping it simple and reflecting the content of the entry) I decided to use the existing title ;-)

Technorati: screencast conf jmaki jersey netbeans glassfish jpa javascript googlemaps restful web2.0 jmakimashups

Thursday Dec 13, 2007

GlassFish @ Delhi University

I presented on GlassFish and related technologies (Metro, JRuby-on-GlassFish and jMaki) at the Department of Computer Science, Delhi University last week. The slides are available here.

The talk was very well attended with approximately 120 students and 4 faculty members. The students were pretty excited and had great a interactive session.


Being an alumni of the school (many years ago ;), it was great seeing the new building of the department, meeting the faculty and interacting with the students. I reached there an hour earlier so that I can mingle with the staff and students and it was a lot of fun.

The department faculty proposed to use GlassFish instead of Tomcat for their next semester assignment. I believe this is a great move as it will allow the students to understand the simplicity and power of a great open-source and Java EE 5 compliant Application server.

I initiated the process of recruiting a Campus Ambassador from Delhi University and this will help establish a better relationship between this University and Sun Microsystems.

Here are the questions and answers that were asked during the session:

  1. Amongst the different Java training courses, how do I decide which one to pick ?

    Sun Learning defines several Learning Paths for different Java technologies (EE, SE, ME, Web Services and Web 2.0). Pick an appropriate learning path depending upon your interest. In addition, Sun Training Catalogue (click on your country) shows different events conducted by Sun Learning in the local geogrpahy.
  2. How does Sun make money with GlassFish being open sourced ?

    That's true, GlassFish is 100% open-source and totally free to use. The business model for Sun is that of selling support and services:
  3. What are the dis-advantages of GlassFish ?

    GlassFish provides an open source, production-quality and Java EE 5 compatible application server. It has world class performance ([1], [2]), .NET interoperable Web services stack, out-of-the-box clustering, load balancing and high availability support. However instead of identifying dis-advantages, here are some areas for improvement:
    • Feature-wise: The footprint for GlassFish v2 is higher than some non-full JavaEE containers (like Tomcat). This problem will disappear with GlassFish v3 which is small (< 100 kb), fast (starts up < 1 sec) and modular (load only required containers).
    • Ecosystem-wise
      • Community is not as well developed as Tomcat or JBoss because we have not been around as long. However the adoption is continuously increasing.
      • We are not yet as transparent as Tomcat, but we are more transparent than anybody else (including JBoss). Transparency will continue to improve in the future.
      • Our governance is still in transition.
  4. Any comparison between NetBeans and Eclipse ?

    Why NetBeans ? explains the top reasons to use the NetBeans IDE. Some specific points are:
    • Consistent UI across all platforms where as Eclipse runs best on Windows
    • A friendlier environment for people who are new with links to sample apps and docs accessible from within the IDE.
    • An easy to use website with tons of quality docs and screencasts.

    Here are couple of more links that provide a comparison between the IDEs:

  5. What are the main features of Ruby as compared to Java ?

    A comparison of Ruby and Java is explained in this blog.
  6. Why Ruby when there are many other languages ?
    • Ruby is getting popular due to Rails.
    • Ruby-on-Rails very popular among web developers.
    • JRuby is a pretty mature implementation of Ruby in Java, running on JVM and able to use existing Java libraries.
    • Complete deployment story on Solaris -- customer can chose native RoR or JRuby on Rails on GlassFish.
  7. What is the difference between Tomcat and GlassFish ?

    Tomcat is a Servlet container that can host JSP and Servlets. GlassFish is a Java EE 5 compliant application server that includes implementation for a Web services stack (Metro), EJBs, Java Persistence and many others incuded in the Java EE 5 specification. In addition to this, GlassFish also provides out-of-the-box clustering, high availability and load balancing capabilities that are required for enterprise applications. Read more about Why use GlassFish ?
  8. What does Sun offer to students ?

    The offerings are described in detail here.
  9. What is ? is a premier web-based, open community created to facilitate Java™ technology collaboration in applied areas of technology and industry solutions. is a central gathering place for Java technology enthusiasts and existing communities across industries, platforms, and interest groups. Read more about in the FAQ.
  10. How do I create a brand new jMaki widget ?

    This is explained in TOTD #20.
  11. What are the main differences between GPL and CDDL ?

    A detailed difference between EULA, GPL, CDDL and BSD in terms of copyright and patent rights is explained here.
  12. What are the different options of doing a collaborative research in association with Sun Microsystems ?

    The Collaborative Research program is explained here.
  13. What is the difference between GlassFish v2 and Sun Java System Application Server 9.1 ?

    There are three key differences:

    The detailed differences are highlighted here.

  14. What are the different ways GlassFish can be configured in NetBeans ?

    Two ways:
    • If you download a full version of NetBeans IDE then GlassFish comes pre-bundled and is installed for you.
    • You can configure an existing GlassFish installation on your machine in the Services tab. If the Services tab is not visible, then select "Windows" menu item and then "Services". Right-click on "Servers", select "Add Server...", select "GlassFish V2" in the "Choose Server" dialog box. Click on "Next" and follow the instructions.

The complete album is here:

Technorati: conf glassfish webservices metro ruby jruby jmaki web2.0 delhiuniversity delhi netbeans q&a

Wednesday Dec 12, 2007

GlassFish @ Bangalore, Chennai and Pune - Metro, jMaki & JRuby

I presented on GlassFish and other related technologies (Metro, jMaki and JRuby) in Bangalore, Chennai and Pune last week. The slides used during the preso are here. And here is the list of questions (along with answers) for you:

  1. What does WSIT offer ?

    WSIT stands for Web Services Interoperability Technology. It is a component of Metro - the Web services stack in GlassFish. WSIT specifically provides support for Security, Reliability, Transactions and interoperability with .NET 3.0. A number of screencasts are available to get you started with Metro and enable all the enterprise features mentioned using NetBeans IDE.
  2. Is Metro plugin available for NetBeans version < 6.0 ?

    Yes, Metro plugin is available for NetBeans 5.5.1. This is clearly explained in screencast #ws4. NetBeans 6.0 is now released and is the recommended version of the IDE.

  3. How do I use LDAP for authentication while using Metro based web service (with Security Token Service) interoperating with .NET web service?

    Security Token Service (STS) can be configured for LDAP authentication. STS service end can be protected with Sun Java System Access Manager web service agent (JSR 196 plugin). It can validate and authenticate the incoming user name token (username / password) against configured LDAP store at STS service side (when Access Manager is hosted as STS) and then issue the corresponding SAML token. You could also write AuthenticationValidator plugin to STS service, that can access and validate incoming username / password against Access Manager LDAP store using Access Manager Client SDK.
  4. Do Metro support Kerberos?

    Metro 1.0 does not support Kerberos. However the latest nightly builds of Metro provide Kerberos support.
  5. I want to contribute to GlassFish. Which areas can I contribute?

    Yes, GlassFish is 100% open source and encourage committers. Some of the ideas are available here. Please feel free to suggest any contributions at
  6. What Ruby features are getting into Java language?

    If Java closures proposal is accepted then that will be a Ruby feature.
  7. Does jMaki take care of browsing history ?

    jMaki does not support browser history yet but this feature will be made available as an extension in the near future.
  8. Is jMaki extensible ?

    Yes, read how jMaki framework can be extended as explained here.
  9. What is the performance impact of using jMaki ?

    jMaki.js is the initialization script (18kb) for jMaki that is loaded when the web application is loaded. This script provides multiple features, included but not limited to:
    • support for common event model between widgets from multiple toolkits (using publish/subscribe)
    • Dynamic Container at component level - allows to resize the component within <div> and iframe
    • doAjax call (allows to asynchronously invoke services from back end)
    • JSON.serialize (serializes JavaScript objects to JSON)
    • inspect (2-level deep inspection of object)
    • logger & debugging (log all publish/subscribe events and other messages to enable debugging)
    • namespace API  (allows to namespace all the widgets for clean separation)

    The jMaki wrapper is a minimal code that needs to be written anyway to invoke the code anyway so there is no additional overhead there.

  10. Is Comet supported in GlassFish/jMaki?

    Yes, read about Comet support in GlassFish The Grizzly Comet and Writing a Comet application using GlassFish. Also try a simple sample that demonstrates how jMaki and Comet (read the explanation) work nicely with each other.

  11. Can GlassFish deploy EJB 2.0 apps ?

    GlassFish is Java EE 5 compliant which maintains backwards compatibility with J2EE 1.4 and so EJB 2.0 applications can be deployed.

  12. Do GlassFish support Active and Passive cluster ?

    In GlassFish the cluster instances talk to each other for health monitoring through GMS (of Shoal). The buddy instances talk to each other for replication of the session state. When a failure is detected the LoadBalancer can failover the request to any instance in the cluster. The session in question will be fetched from a replica to this instance in order to continue the conversational state of the session. In this sense, we have an active cluster.

    GlassFish does not have a concept of a standby or passive cluster which will take over when an active cluster fails altogether. That is usually considered a high cost approach for redundancy and not advisable. 

    Read more discussion here.

  13. Can we add a Metro Web service wrapper be created around EJB 2.0 ?

    Nope, Metro Web service wrapper can be created around EJB 3.0 only.

  14. How can an application deployed on WebLogic be migrated to GlassFish ?

    Migrate2GlassFish helps automate the migration of J2EE/Java EE applications to GlassFish.

  15. Can Entity beans be configured only as read-only beans - caching server for these beans ?

    Yes, read about the characteristics, good practices, how to deploy and refresh read-only beans.

  16. How can jMaki applications run behind the firewall ?

    Add the following Servlet parameters to web.xml:


    This is described in detail at

Technorati: conf webservices web2.0 ruby jruby projecmetro glassfish netbeans q&a


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Arun Gupta is a technology enthusiast, a passionate runner, author, and a community guy who works for Oracle Corp.

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