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Java Developers

A group for Java developers on the islands.

Members: 84
Latest Activity: Apr 10, 2017

Discussion Forum

JPA? 4 Replies

Started by George. Last reply by George Mar 4, 2012.

Java in Decline? 6 Replies

Started by Daniel Leuck. Last reply by Daniel Leuck Mar 4, 2012.

It's been a long time coming, but Java 7 is finally with us 1 Reply

Started by Paul Graydon. Last reply by Daniel Leuck Jul 28, 2011.

Java Developer News

How to Send and Receive Product Objects To or From a Queue [Video]

In the video below, we take a closer look at how to send or receive product objects to or from a queue using Spring, JMS, and RabbitMQ with annotations. So, let's get started!

Check out the links below to download the code and PPT:

Playing With Graal VM

Recently, I started playing with Graal VM. What is Graal VM? To quote their website directly:

GraalVM is a universal virtual machine for running applications written in JavaScript, Python, Ruby, R, JVM-based languages like Java, Scala, Kotlin, Clojure, and LLVM-based languages such as C and C++.

Extending Abstract Classes With Abstract Classes in Java

The Example Issue

When I was creating the Java::Geci abstract class AbstractFieldsGenerator and AbstractFilteredFieldsGenerator, I faced a not too complex design issue. I would like to emphasize that this issue and the design may seem obvious for some of you, but during my recent conversation with a junior developer (my son, Mihály specifically, who also reviews my articles because his English is way better than mine), I realized that this topic may still be of value.

Anyway, I had these two classes, fields and filtered fields generator. The second class extends the first one:

How to Use ApplicationContext Interface [IoC Container] Methods in Spring [Video]

In the video below, we take a closer look at how to use the ApplicationContext interface (IoC Container) methods in Spring. So, let's get started!

Check out the links below to download the code:

Permutation Check in Java

Here is a new Algorithm problem continuing our season. If you missed the first article, check it here: Decide if a String has duplicates.

Our next problem description is the following:

Comment Wall


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Comment by Vern Takebayashi on April 24, 2010 at 8:27pm
Yes, you are correct about Jackson being able to produce that output. The main reason why I put the toString() method in, is that I usually require that my students write that method for any basic storage class that they write. I think Jackson will get a fair amount of usage, especially since it is one of the best performing Java JSON parsers.
Comment by Les Vogel on April 24, 2010 at 3:10pm
Cool. I've been using org.json which while fairly tiny, is really annoying to use. Jackson looks like it produces more of what one would like.

I imagine that your toString method could easily ask Jackson to do that for you with a lot less code, but at the expense of order.
Comment by Vern Takebayashi on April 24, 2010 at 2:57pm
Hi, I did not see much about JSON parsing in Java. Here is a PDF file
json-parsing-with-jackson.pdf that I just wrote for my ICS 111 course, that uses the Jackson Java JSON parser (
) If any of you care about JSON parsing in Java, I would appreciate feedback on this handout. Thanks, Vern
Comment by Stephen McMahon on April 1, 2009 at 3:01pm
Here's a good GWT presentation that I stumbled upon yesterday:

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