Java Latest Updates: April 2009

Thursday, April 30, 2009

Cloud computing mechanics

JAVAWORLD'S ENTERPRISE JAVA ALERT
Solutions for Java developers
04/30/09

By Guerry Semones

Platform-oriented approaches to the cloud, including
platform-as-a-service (PAAS) and cloud application platforms,
run atop an underlying cloud infrastructure. Cloud platforms
abstract applications away from the cloud infrastructure and
provide supporting services and functionality to those
applications. The distinction between cloud infrastructure and
cloud platforms is a critical one for architects and developers
to understand.

Salesforce's Force.com and Google's App Engine (GAE) both typify
the PAAS approach. Google App Engine users are solely concerned
about the application they are creating to run on the platform.
To deliver an application, they simply package it and deploy it
to GAE The deployment happens in a single step and the end user
does not know whether the application is being run on one
virtual machine or 10 at any particular moment. In addition, the
application can take advantage of special services provided by
the GAE platform, such as authentication or data access.

Cloud application platforms, like their PAAS cousins, allow the
developer to focus solely on the application deployed on the
platform. Likewise, cloud application platforms offer the same
or similar benefits described briefly for GAE above, such as
virtualizing your application across the infrastructure,
simplifying deployment, or providing special services. A key
difference between some cloud application platforms and their
PAAS cousins is portability across cloud infrastructures. For
example, you can only deploy GAE applications on Google's
services, whereas cloud application platforms like Appistry
CloudIQ Platform allow for in-house private cloud deployment, as
well as deployment on public cloud infrastructures. Among other
differences, PAAS solutions often restrict tool choices, whereas
typical cloud application platforms allow you flexibility in the
choice of implementation languages, IDEs, and tools.

Ideally, you should not have to care about the underlying cloud
infrastructure that runs your code. Likewise, you should not be
concerned with writing application code to implement
scalability, reliability, and other cloud and distributed
computing features that a cloud platform could provide. Your
focus should be on the business logic that brings your added
value, while the cloud virtualizes your application, manages its
lifecycle, and leverages your application over the underlying
cloud infrastructure. Cloud platforms take your code -- which is
ideally atomic, stateless (where possible), idempotent, and
parallelizable -- and does the heavy distributed computing and
multicore lifting, giving you benefits that are otherwise hard
to achieve on your own ...

Read more: Scaling out, scaling up, and scaling down gracefully
http://www.networkworld.com/nljavaworldsente194287

1. Multicore-friendly and cloud-ready code, Part 1: Design
principles http://www.networkworld.com/nljavaworldsente184954

2. Private clouds: A first step in cloud computing
http://www.networkworld.com/nljavaworldsente194288

3. Spring Web Flow 2: A boon to JSF developers
http://www.networkworld.com/nljavaworldsente169325

4. Todd Hoff: High scalability and Java
http://www.javaworld.com/podcasts/jtech/2008/112608jtech.html

New! Java Tip: Extending declarative caching services for Spring
http://www.javaworld.com/community/node/2821

Spring Modules offer an easy way to add and tune caching
functionality without touching an application's code, but the
approach often falls short when scaled in real-world scenarios.
This tip explains real-world problems faced when using Spring
Modules for declarative caching and extends the existing
declarative model to address them.

1. Peruse the Java Tips Archive - 143 tips in all!
http://www.javaworld.com/columns/jw-tips-index.html

2. Subscribe to the Java Tips Blog feed
http://www.javaworld.com/community/blog/21645/feed

3. Got a tip? Submit it here mailto:jwedit@javaworld.com

Hot discussions -- let's hear it in JW Blogs:

Is Spring MVC relevant in 2009?
http://www.javaworld.com/community/?q=node/2849

Does JavaFX have a future with Oracle?
http://www.javaworld.com/community/node/2859

Convincing the boss to pay for your training - do's and don'ts
http://www.javaworld.com/community/node/2836

New Podcast! Make way for Jetty: Coming of age at 12

Jetty is a lightweight Java and Web application server that has
been making waves since turning 12 in the first months of 2009.
In this talk with Andrew Glover, Jetty engineers Greg Wilkins
and Jan Bartel discuss core aspects of Jetty that have made it a
popular choice for Web application deployment in Web 2.0
environments. Topics include Jetty's early adoption of
Comet-style "server push" interactions, its use in Android and
other mobile application environments, its lightweight,
embeddable component model, and its recent adoption as an
Eclipse Foundation project. Webtide CEO Adam Lieber joins in to
discuss the open source business strategy behind Jetty and other
Webtide initiatives.

Listen up: Greg Wilkins and Jan Bartel: Why Jetty is succeeding
now http://www.networkworld.com/nljavaworldsente193845 You've hit the tip of the iceberg: Read more in JW Blogs
http://www.javaworld.com/community/

_______________________________________________________________
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Metzler: 2009 Handbook of Application Delivery.
Successful IT organizations must know how to make the right application delivery decisions in these tough economic times. This handbook authored by WAN expert Jim Metzler will help guide you.
http://www.nww.com/rpgx.jsp?c=XU1PTA7015Z4343
_______________________________________________________________

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ALSO FEATURED ON JAVAWORLD

Mastering Spring MVC
http://www.networkworld.com/nljavaworldsente193844
If you like the Spring Framework, you'll want to explore Spring
MVC for Web development. With Steven Haines as your guide, learn
where Spring MVC fits into the Java Web development landscape
(including a little bit of Java history), then quickly get up to
speed developing a Spring MVC application.
Steven Haines,April 2009

Java Tip: Extending declarative caching services for Spring
http://www.javaworld.com/community/node/2821
Spring Modules offer an easy way to add and tune caching
functionality without touching an application's code, but the
approach often falls short when scaled in real-world scenarios.
This tip explains real-world problems faced when using Spring
Modules for declarative caching and extends the existing
declarative model to address them.
Sameer Padwal, April 2009

Lean service architectures with Java EE 6
http://www.networkworld.com/nljavaworldsente191680
Thanks to Java EE 6's simplified development model, a few
interfaces and annotated classes are all you need to implement
the facade, the service, and the domain structure that
constitute a lean service-oriented architecture. Surprised? Read
on.
Adam Bien,April 2009

Writing good unit tests, Part 2: Follow your nose
http://www.networkworld.com/nljavaworldsente191096
Klaus Berg continues his investigation of the tools and best
practices that facilitate programming with GUTs. Get tips for
writing cleaner, more efficient assertions, handling checked and
unchecked exceptions, and knowing when and how to refactor your
test code. Examples are based on JUnit 3 and 4, TestNG, and
Hamcrest.
Klaus P. Berg,April 2009

Jump into JavaFX, Part 4: The advanced APIs
http://www.networkworld.com/nljavaworldsente190628
Jeff Friesen completes his comprehensive tour of the JavaFX APIs
with a look at how JavaFX handles media, GUIs, and special
effects. You'll also try your hand at building and deploying a
stock-ticker application to Google Chrome.
Jeff Friesen,April 2009

REST for Java developers, Part 4: The future is RESTful
http://www.networkworld.com/nljavaworldsente190066
Find out why REST interfaces are foundational for emerging
architectures such as the Semantic Web. Brian Sletten takes a
big-picture view of REST, now and in the future, in this final
article in his series.

_______________________________________________________________
This newsletter is sponsored by Dell
Liberation by Automation

UPCOMING ON JAVAWORLD

-Know your Oracle application server
-Domain-driven development with Java EE
-Tapestry 5: Day one
-Clojure: Challenge your Java expectations
-The Ajax developer's toolkit: An overview
-Open source Java projects: JCC

Podcasts:

-Howard Lewis Ship: What's new in Tapestry 5
-Grant Ingersol: Lucene and Solr

JavaWorld's Daily Brew - Starting conversations in the Java
developer community
http://www.javaworld.com/community
_______________________________________________________________

BONUS FEATURE

Metzler: 2009 Handbook of Application Delivery. Successful IT
organizations must know how to make the right application delivery
decisions in these tough economic times. This handbook authored by
WAN expert Jim Metzler will help guide you.
http://www.nww.com/rpgx.jsp?c=XU1PTAZ4343

_______________________________________________________________

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Tuesday, April 28, 2009

Mastering Spring MVC

JAVAWORLD'S ENTERPRISE JAVA ALERT
Solutions for Java developers
04/28/09

By Steven Haines

This brief history begins with Java's entry into Web application
development: the Servlet API
http://www.networkworld.com/nljavaworldsente183218 , introduced
in 1997. Before then, developing dynamic Web applications with
disparate APIs and programming models proved to be challenging.
(I'll resist the urge to recap the old days of CGI
http://www.javaworld.com/jw-01-1997/jw-01-cgiscripts.html , the
futile battle between Netscape Server plug-ins and ISAPI
plug-ins, and all the homegrown APIs.) The Servlet API provided
a standard on which vendors could build Web containers and
developers could implement a simple programming model for
constructing Web pages.

With servlets, dynamically constructing HTML documents became
easy. But because the documents were constructed inside Java
source code, maintenance was challenging. For example, changing
a font or moving a piece of content within a page required you
to update the HTML inside the servlet code and then recompile
and redeploy it to the container.

Sun resolved this issue in 1999 by introducing JavaServer Pages
http://www.networkworld.com/nljavaworldsente193842 (JSP).
Rather than implementing presentation code inside servlets, JSPs
lets you build HTML-like documents that interweave snippets of
Java code to support dynamic content. At runtime, JSPs are
translated to servlet source code, compiled, and then deployed
to a Web container dynamically. If you change any part of the
JSP, the container detects the change, recompiles the page, and
redeploys it. This architecture was calledpage-drivenor Model 1.

In page-driven applications, each page not only contains the
business logic required to generate the dynamic content, but
also the control logic to determine application flow. Control
logic became difficult to maintain because there was no central
location or design paradigm to help you understand how a user
passed from one page to the next. And as business requirements
evolved to include features like authentication and
authorization, page code became convoluted with additional logic
that usually had to be duplicated across pages, even if it was
irrelevant to the page being constructed. On a site with 1,000
pages, all with authorization mechanisms, who wants to update
all 1,000 pages when those authorization mechanisms change?

The solution was to separate programmatic responsibilities into
the technologies best suited for them. Servlets are great for
writing Java code, acting as a central point for managing
application flow and invoking business methods, but horrible at
presentation; JSPs are great at presentation but are a horrible
place to embed all of your business logic. Thus was born the
Model 2 architecture
http://www.networkworld.com/nljavaworldsente193843 , which
adheres to the MVC Smalltalk design pattern:

1. The model represents your data or the objects with which your
application is interacting.

2. The view is a visualization of your model.

3. The controller manages application flow and makes calls into
business objects.

Read more: Mastering Spring MVC - A hands-on tutorial
http://www.networkworld.com/nljavaworldsente193844

1. Spring Web Flow 2: A boon to JSF developers
http://www.networkworld.com/nljavaworldsente169325

2. Understanding JavaServer Pages Model 2 architecture
http://www.networkworld.com/nljavaworldsente193843

3. Discussion: Is Spring MVC worth attention in 2009?
http://www.javaworld.com/community/?q=node/2849

New! Java Tip: Extending declarative caching services for Spring
http://www.javaworld.com/community/node/2821

1. Peruse the Java Tips Archive - 143 tips in all!
http://www.javaworld.com/columns/jw-tips-index.html

2. Subscribe to the Java Tips Blog feed
http://www.javaworld.com/community/blog/21645/feed

3. Got a tip? Submit it here mailto:jwedit@javaworld.com

New! Podcast: Make way for Jetty: Coming of age at 12
http://www.networkworld.com/nljavaworldsente193845

Listen up: Greg Wilkins and Jan Bartel: Why Jetty is succeeding
now http://www.networkworld.com/nljavaworldsente193845

When the job changes but the programmer doesn't, Part 2: Saving
Frank's job http://www.javaworld.com/community/node/2796

By Esther Schindler

Last week, I described the plight of a maintenance programmer
whose company was moving to a new language and development
platform. Although Frank has worked for the medium-sized company
for some years, he's just not being productive. I promised the
rest of the story this week ....

Deadlock anti-patterns #3: Incremental locking
http://www.javaworld.com/community/node/2789

By Obi Ezechukwu

Tthe incremental locking anti-pattern is simple, well-known, and
well documented -- and is unfortunately still a frequent
mistake. Chances are that most developers who have had the
misfortune of debugging deadlocking code would have come across
this pattern at some point in their career ...You've hit the tip of the iceberg: Read more in JW Blogs
http://www.javaworld.com/community/

_______________________________________________________________
This newsletter is sponsored by Sun Microsystems
Java + You = Registration

Meet the most amazing experts at the 2009 JavaOne Conference.
June 2-5 in San Francisco, CA. Learn more.
http://adserver.fattail.com/redir/redirect.asp?CID=298628
_______________________________________________________________

Metzler: 2009 Handbook of Application Delivery.
Successful IT organizations must know how to make the right application delivery decisions in these tough economic times. This handbook authored by WAN expert Jim Metzler will help guide you.
http://www.nww.com/rpgx.jsp?c=XU1PTA7013Z4343
_______________________________________________________________

This Newsletter Subscription Compliments of: Linuxworld.com http://www.linuxworld.com

ALSO FEATURED ON JAVAWORLD

Understanding actor concurrency, Part 2: Actors on the JVM
http://www.networkworld.com/nljavaworldsente188943
Erlang isn't the only language for implementing actor
concurrency. Find out how actors work and see them implemented
in Scala's standard library, Groovy's GParallelizer, and the
Java libraries Kilim, ActorFoundry, Actors Guild, and Jetlang.

_______________________________________________________________
This newsletter is sponsored by Sun Microsystems
Java + You = Registration

UPCOMING ON JAVAWORLD

-Know your Oracle application server
-Cloud-ready, multicore-friendly code, Part 2
-Tapestry 5: Day one
-Clojure: Challenge your Java expectations
-The Ajax developer's toolkit: An overview
-Open source Java projects: JCC

Podcasts:

-Howard Lewis Ship: What's new in Tapestry 5
-Grant Ingersol: Lucene and Solr

JavaWorld's Daily Brew - Starting conversations in the Java
developer community
http://www.javaworld.com/community
_______________________________________________________________

BONUS FEATURE

Metzler: 2009 Handbook of Application Delivery. Successful IT
organizations must know how to make the right application delivery
decisions in these tough economic times. This handbook authored by
WAN expert Jim Metzler will help guide you.
http://www.nww.com/rpgx.jsp?c=XU1PTAZ4343

_______________________________________________________________

International subscribers click here:
http://nww1.com/go/circ_promo.html
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