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Java User Groups

A while ago, I was asked to evaluate another Java application that was being used at my company. It was a point-of-sale app, developed entirely "in-house" by one of our overseas affiliates. I wondered what their MVC model would look like. How different would their Java app be from the ones I have worked on? I started my evaluation by learning all I could about the architecture and design of this...
on Sep 8, 2013
Introduction Linda van der Pal has been a developer since 2002, visiting many conferences to gather and share knowledge. In 2006, she founded Duchess, a network for women interested in Java. She is now a member of the board of the Dutch chapter, along with R
on Sep 7, 2013
JavaOne 2013 is almost here, but the community theme phrase still hasn't been selected. You can have a say in this by voting for one of the 10 final contenders in the JavaOne 2013 Community Theme poll. Click the link to vote, or just go to the home page and vote there. Voting will end midnight, September 8, Sunday (US Pacific time). Subscriptions and Archives: You can subscribe to...
on Sep 5, 2013
Very soon, it will be time for the annual Java One conference in San Francisco, California. Thousands of Java-fanatics will make the journey to my favorite city "by the bay" (and my home town). Thousands more Java-fanatics will not attend (including me) and wish they could. I hope all attendees will have a great and productive time at Java One 2013. My general advice to attendees is, "Make the...
on Aug 25, 2013
Cassandra is an open source column oriented nosql database. It was born to solve problems with persistence and high performance. Cassandra has been used by many companies in many industries for a wide variety of use cases. In addition it has a strong and thriving community supporting it. We will be having a special series of events throughout Brazil in the first week of September. Each day...
on Aug 21, 2013
Grails in Action, Second Edition MEAP Update + 44% off Save 44% on Grails in Action, Second Edition with Promotional code mlgsmith2jn at What
on Aug 20, 2013

Java Desktop

Visual Library is a library in NetBeans, which you can use in standalone Java apps, for doing beautiful, complex, animated layouts. JUNG is a library for exploring graphs of connected data. What if we put those two things together? That's what I did. The result is on GitHub. Video demo and more info over on my blog.
on Sep 4, 2013
The Joy of Clojure, Second Edition by Michael Fogus and Chris Houser has 4 new chapters! Save 45% with Promo code mlfogus2jn at What's new? The authors have released the following chapters:
on Sep 3, 2013
In Java, implementing via SQL is a well-developed practice for database computation. However, the structured data is not only stored in the database, but also in the text, Excel, and XML files. Considering this, how to compute appropriately regarding the structured data from non-database files? This article raises 3 solutions for your reference: implement via Java API, convert to database...
on Aug 29, 2013
Save 45% on The Programmer's Guide to Apache Thrift with Promo code mlthriftjn2 at The Programmer's Guide to Apache Thrift by Randy Abernethy has been updated! What's new?
on Aug 28, 2013
"Using State in Actors" is new to Akka in Action + 45% off Akka in Action is written by Raymond Roestenburg, Rob Bakker, and Rob Williams Save 45% on Akka in Actionwith promo code mlakkajn at In chapter 7, you learned about two possible ways to keep state in an Actor by using class attributes and the become/unbecome functionality. Chapter 10 talks about two more solutions that you...
on Aug 27, 2013
In the most recently completed poll, a large majority of developers stated that they have not yet done any development using JavaFX. polls are not scientific, of course, but it's unusual for the polls to produce such a decisive result. Participation in the poll was high: 2120 votes were cast, and three comments were posted. The exact question and results were: Have you done...
on Aug 24, 2013
According to research, most complex report development work can be simplified by performing the data source computation in advance. For example, find out the clients who bought all products in the given list, and then present the details of these clients. In developing such reports, it is the
on Aug 20, 2013
Save 44% on CoffeeScript in Action, by Patrick Lee with Promotional code mlleejn at What
on Aug 16, 2013


One of the most interesting things about JavaOne is the announcements. Some years, there isn't a single big announcement, while other years something of enduring significance is announced or released during JavaOne. While we won't know what surprise announcements or releases this year's conference will include, a look at the conference agenda, the keynotes, the tracks, and the sessions, can give...
on Aug 31, 2013

Java Web Services and XML

I'm expanding on an earlier post where I explained how to deploy JAX-RS Web Services to the Oracle Cloud. In that entry the web service simply returned a hard-coded "Hello World". In reality, you most likely want your web service to expose something more meaningful. In this post I'm going to expand the HelloJerseyApp to display the results from a table, which I'll expose using a JPA...
on Aug 30, 2013

Java Enterprise

javax.servlet.http.HttpSession provides a way to identify an user across multiple HTTP requests and to store user specified information. In other words, it provides a support of stateful communications with the stateless HTTP protocol. For security and memory management, sessions need to be invalidated at a certain time. There are two related methods in HttpSession. HttpSession.invalidate() By...
on Aug 29, 2013
I've been blessed with the opportunity to speak about JSF 2.2 at JavaZone and JavaOne. Just before both events I'm doing a full day JSF 2.2 class. This blog entry advertises both classes. JSF 2.2 Class in Mannheim, Germany Monday 2013-09-09 Thanks to Papick Taboada, I partnered with OIO to present a full day JSF 2.2 class at their facility in Mannheim, Germany on Monday 2013-09-09. Here is the...
on Aug 28, 2013

Java Tools

Spring is an open source framework whose goals is facilitate the Java developer's life, it began with dependency injection and nowadays works on many plug-ins. Plug-ins such Spring Social, to connects social media like twitter and facebbok, Spring security beyond control inversion. The goal of this post is talk about Spring Data working with Cassandra. Spring Data does part of Spring plug-in,...
on Aug 25, 2013