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Java Enterprise

Last week, I attended the global live launch of Java EE 7, a webcast I wrote about earlier, titled "Introducing Java EE 7." The live webcast happened twice (on at 17:00 GMT on June 12, and 12 hours later at 05:00 GMT on June 13), thus enabling every Java developer in the world to attend the live session at some point during non-sleeping hours. The value of attending the live sessions was...
on Jun 19, 2013
Asynchronous operation was introduced in Servlet 3.0. ServletRequest#startAsync is used to put the request into asynchronous mode. A thread need to be created implicitly or explicitly (see here for an example). Servlet 3.1, JSR 340 includes clarifications in asynchronous area. Besides Servlet 3,1, Concurreny Utilities for Java EE 1.0, JSR 236 is introduced in Java EE 7. JSR 236 provides a...
on Jun 6, 2013
Update: In Servlet 3.0, the behavior of using response is undefined after invoking #complete or #dispatch. In Servlet 3.1, it is clarified that AsyncContext#getResponse will throw IllegalStateException. The blog has been updated for this. Asynchronous operation is supported in Servlet 3.0. I have discussed startAsync in my previous blog, startAsync in Servlet 3.0. In this blog, I will discuss...
on May 14, 2013
Update: Invoke WebConnection#close when there is an error. Servlet 3.1 Specification (JSR 340) is almost ready for the release. One of the new features is the support for protocol upgrade. HTTP protocol upgrade was introduced in HTTP 1.1 (RFC 2616): The Upgrade general-header allows the client to specify what additional communication protocols it supports and would like to use if the server...
on May 7, 2013
Servlet 3.1 Specification (JSR 340) and Java Authorization Contract for Containers (JSR 115) MR3 are almost ready for release. Besides "*", the role-name "**" is introduced in the above two specifications. In a nutshell, "*" means any role defined in web.xml and "**" means any authenticated user. Prior to Servlet 3.1, web containers use proprietary mechanisms to add security-constraints for any...
on Apr 19, 2013
Servlet 3.1 Specification (JSR 340) is almost ready for the release. Several new security features have been added in this version of Servlet specification. In this blog, I will explain one of the security features, namely deny-uncovered-http-methods. Let us take a look at a simple security-constraint in web.xml as follows: <web-app xmlns="http://www.w3.org/2001/XMLSchema" ...
on Apr 19, 2013
Update: One should not use response in AsyncListener#onComplete. Only print debug in this example. Servlet 3.1 (JSR 340) is almost ready for the release. One of the new features is the support for non-blocking IO. ReadListener and WriteListener are introduced to allow non-blocking processing in Servlet. Non-blocking IO can only be used in async (defined in Servlet 3.0) or the upgrade mode. We can...
on Apr 16, 2013
The applications have grown together with the man dream to get more and more information, then more application have been emerging and the man had became hostage of the application. For example we can recognized the evolution between man and machine: In the first time: Many men to just one machine ( like mainframe's age) then one man to one machine ( in to Personal computer era) and...
on Mar 17, 2013
This quick blog entry is just to advertise the availability of the Proposed Final Draft of JSF 2.2 (JSR-344). You may download the draft of the spec at <http://jcp.org/aboutJava/communityprocess/pfd/jsr344/index.html>. You may try out the implementation by dropping this maven GAV into the modules directory of GlassFish 3.1.2.2: <a href="http://search.maven.org/#search|ga|1|g%3A%...
on Mar 15, 2013

Java User Groups

When we started building our first Java application, at my company Amway Corp, many years ago; we learned our first lesson. In spite of all the formal training we received, in spite of all the literature at our disposal; we still needed help with our Java development on a regular basis. Where would this assistance come from? At the time, we had no in-house Java subject-matter experts. What we...
on Jun 16, 2013
Learning Java (or any programming language) can be a great challenge. Any group of developers, learning Java, will bring with them a variety of backgrounds and experiences. In our case, our first Java project began with developers that had COBOL language experience. Our second Java project, began with developers that had RPG language experience. Even though COBOL and RPG don't "look" like Java,...
on Jun 11, 2013
Tuning Java code presents many challenges and addresses several goals. One of these goals is to make the application "run faster". Recently, our end-users were getting multiple-second response times from our web application's home page. This was unacceptable. We were asked to see what we can do to make the web application "run faster". We began by looking at the usual suspects... database access...
on Apr 14, 2013
Have you wanted to do something with asynchronous I/O? I did. After doing some work with Node.js, I wanted to find a way to get some of the goodness of its programming model for Java. The Acteur project is the result - a framework for building scalable, asynchronous web applications using Netty + Guice - was the result. The programming model is a little unusual - you treat constructors as...
on Apr 7, 2013
One of the biggest challenges facing us during the creation of our first Java application was learning to develop with the Java programming language. We were concerned about how well our team of developers would learn and adapt to Java. Since Java was an object-oriented programming language, we had object-oriented concepts to learn as well. Our first Java training class was titled, "Developing...
on Mar 24, 2013

Java Desktop

Sebastiano Armeli-Battana is the author of the successful 'MVC Applies to JavaScript' eBook. We thought we'd get to know a little more about the author! 1. For someone that’s new to the JavaScript sector, can you explain why they should use MVC? I would say that a JS noob should use MVC, just because it’s widely spread pattern used across different programming languages. I think they would enjoy...
on Jun 14, 2013

Java Web Services and XML

Following the development of Java EE 7 has required reading lots of different posts about the different JSRs that are part of Java EE 7. On Wednesday, June 12 (or Thursday, depending on where you live), you'll have an opportunity to familiarize yourself with Java EE 7 in one sitting, by attending Introducing Java EE 7, a live global interactive webcast that will happen twice: at 9 AM Pacific...
on May 31, 2013
In the most recently completed Java.net poll, developers overwhelmingly considered the HTML 5 related enhancements in Java EE 7 to be the most important. The poll highlighted five of the many areas of enhancement that will be included in Java EE 7, and provided a "Something else" option as well. The 1631 votes that were cast represent one of the highest totals for recent Java.net polls. The...
on Apr 15, 2013

JCP

There are a number of topics JSR 359 EG is working on. These are on a number of different categories. It includes improving the RFC coverage of SIP specification (SIP outbound), Modernizing programming (using POJOs), better alignment with Java EE (CDI, latest servlet spec), SIP over websockets, Extensibility, Better concurrency control, Updates to B2B etc. In this blog series, I am planning to...
on May 6, 2013
Servlet 3.1 was in Public Review in Janurary 2013. And it is in Proposed Final Draft now. Most of the new features are related to security. In this following, I will highlight features since Servlet 3.1 Public Review: add new API javax.servlet.http.Part#getSubmittedFileName add new API javax.servlet.ServletContext#getVirtualServerNameThis API allows a JASPIC module to be registered in a Servlet...
on Mar 18, 2013

Java Tools

One of the first things we did as we began to learn about Java was to create our own library of Java books. Every member of the development team was given the chance (and funding) to build their own collection of books. In time, these book collections became a sort of "comfort blanket" for the developers. In addition to being a valuable source of reference material, these collections act as a...
on Mar 29, 2013