2017-03-10 14:00
This blog will show how a simple Java application can talk to a database using service discovery in DC/OS. Why Service Discovery? An application typically consist of mult… Read More
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2017-03-10 11:00
Containers are meant to be ephemeral and so scale pretty well for stateless applications. Stateful containers, such as Couchbase, need to be treated differently. Managing Persistence fo… Read More
2017-03-09 14:00
Parsers are powerful tools, and using ANTLR you could write all sort of parsers usable from many different languages. In this complete tutorial we are going to: explain the basis: what a par… Read More
2017-03-09 11:00
This is the last in a serie of posts about continuous delivery based on my local Docker compose stack (see the first and second post here). In this post I use a simple Spring Boot project to… Read More
2017-03-08 11:00
As of Spring Boot 1.5 a new loggers actuator endpoint allows viewing and changing application logging levels in runtime. Add spring-boot-actuator to your project org.springframework.boot spr… Read More
2017-03-08 08:00
Let me say right off the bat that the features we will discuss here are pure poison brought to object-oriented programming by those who desperately needed a lobotomy, just like David West su… Read More
2017-03-08 05:00
IoT MQTT protocol tutorial describes to control a remote peripheral. We have already covered the MQTT protocol and how it works and we already know the IoT MQTT is used to send data from rem… Read More
2017-03-07 20:00
A few days ago I ran into a problem while dealing with a LocalDateTime attribute in JPA. In this blog post I will try to create a sample problem to explain the issue, along with the sol… Read More
2017-03-07 17:15
Everyone wants to implement continuous delivery. After all, the benefits are too big to be ignored. Increase the speed of delivery, increase the quality, decrease the costs, free people to d… Read More
2017-03-07 14:00
Editor’s Note: At Strata+Hadoop World 2016 in New York, MapR Director of Enterprise Strategy & Architecture Jim Scott gave a presentation on “Handling the Extremes: Scal… Read More
2017-03-06 14:00
A question from a LinkedIn follower, I thought I’d share my answer with readers: “Hey Allan, I’m giving this a shot reaching out to you. I recently was exposed to agile in… Read More
2017-03-06 11:37
Does your team spend over 10% of its time debugging Java in production? Deploying new code to production is a challenging task. What works on your local environment doesn’t act the sam… Read More
2017-03-06 08:03
Ceylon 1.3.2 is a significant minor release of the Ceylon language, with over 100 issues closed. This release introduces Ceylon assemblies, allows you toexport Ceylon modules as Maven reposi… Read More
2017-03-06 06:19
19 Hours of Practice to Prepare You to Pass 5 IT Industry-Leading Certification Exams Hey fellow geeks, This week, on our JCG Deals store, we have an extreme offer. We are offering the The P… Read More
2017-03-06 05:00
Contexts and Dependency Injection 2.0 (JSR 365), is an update to CDI 1.2, which is currently part of the Java EE 7 platform. It is currently in Public Review stage. For thos… Read More
2017-03-03 14:00
When I was first learning Java and transitioning from C++ to Java, I remember being told repeatedly and frequently reading that one should not treat the Java finalizer like C++ destructors a… Read More
2017-03-03 11:00
If you use Spring Data and @NamedQuery annotations at your JPA entity you can easily use them in a more convenient way using the spring data repository. On a previous blog we created a sprin… Read More
2017-03-02 11:00
I’m particularly interested in learning more about Language Server Protocol at the combined Eclipse Converge and Devoxx US conferences at the end of March. We have a han… Read More
2017-03-02 08:00
The other day I was at an event for start-ups and entrepreneurs – no, not the “Agile for Startups” event I’m speaking at in a couple of weeks, for once I was in the a… Read More
2017-03-02 05:00
During nearly every presentation in which I explain my view of object-oriented programming, there is someone who shares a comment like this: “If we follow your advice, we will have so… Read More
2017-03-01 20:00
In a previous post I had gone over how to bring up an OAuth2 authorization server using Cloud Foundry UAA project and populating it with some of the actors involved in a OAuth2 Aut… Read More
2017-03-01 17:00
The Java 9 EA version is out and we can now see how to use sun.misc.Unsafe. I led the public campaign to retain access to it in Java 9 which was ultimately successful, leading to the am… Read More
2017-03-01 14:00
Over the last few days I’ve been watching the chain of ‘My name is…’ tweets kicked off by DHH with interest. As I understand it, the idea is to show that coding inte… Read More
2017-03-01 11:00
In this part we look at putting a micro service together as a collection of services, and consider how we can evaluate the performance of these services. We introduce JLBH (Java Latency Benc… Read More
2017-03-01 08:00
A common issue we cover in our workshops is, how to restart a queue reader after a failure. The answer is not a simple as you might think. Ti… Read More
2017-03-01 05:00
One of the problems with using microservices is performance. Latencies can be higher due to the cost of serialization, messaging and deserialization, and this reduces throughput. In particul… Read More
2017-02-28 20:00
In this part we look at turning a component into a service. In Part 1, we looked at how we can easily create and test components which expect asynchronous messages in and produce asynch… Read More
2017-02-28 17:00
At a high level, different Microservice strategies have a lot in common. They subscribe to the same ideals. When it comes to the details of how they are actually implemented, they can vary… Read More
2017-02-28 14:00
Microservices is a buzz word at the moment. Is it really something original or based on established best practices? There are some disadvantages to the way microservices have been implemente… Read More
2017-02-27 20:00
Spring Framework was created as a result of disappointment of Java community with earlier versions of Enterprise Java. Since then it has grown into huge ecosystem that allows one to solve ev… Read More
2017-02-27 17:00
1. Introduction From the previous part of the tutorial we have got a pretty good understanding of what Elasticsearch is, its basic concepts and the power of search capabilities it could brin… Read More
2017-02-27 14:00
Let me give you the punch-line and then explain myself: As soon as testing starts every “project” becomes a test driven. If there is no formal testing period then that phase begi… Read More
2017-02-27 11:00
The Internet of Things (IoT) is everywhere and you might have finally decided it is time to give it a go. Starting out might not be as easy as you think, as IoT is fast changing, with new fe… Read More
2017-02-27 08:00
A reader asked me this question: “How do I report on the 1000 (or so) defects in our system? I have 10 minutes on the status call.” If you are working on a legacy application whe… Read More
2017-02-27 06:40
Keep Your Coding Chops Sharp with 10 Courses on the Newest Developments in Computer Science Hey fellow geeks, This week, on our JCG Deals store, we have an extreme offer. We are offering the… Read More
2017-02-27 05:00
When we talk about microservices architectures, we’ve come to realize that the organization and communication structures of your teams greatly influence the design of your technology s… Read More
2017-02-24 20:00
Consensus is a powerful approach to generate strong buy-in and shared ownership of a decision. But it can be challenging to apply and if used incorrectly, it can create mediocre results. Thi… Read More
2017-02-24 17:00
Java 8 is a couple of years old but there are still use cases, not even edge cases, that the community did not yet develop a good arsenal of solutions for. How to handle checked exceptions i… Read More
2017-02-24 14:00
Docker 1.13 introduced a set of features that allow us to centrally manage secrets and pass them only to services that need them. They provide a much-needed mechanism to provide information… Read More
2017-02-24 11:00
This is the first part in my series of articles in moving from macro to microservices. Here, I’ll present first the reasoning as to why a developer or manager would make such a move. L… Read More
2017-02-23 14:00
Every now and then I find myself wanting to import a CSV file into Neo4j and I always get confused with how to handle the various null values that can lurk within. Let’s start with an… Read More
2017-02-23 11:00
Previously we set up a Scala implemented storm topology in order to count words. What comes next is uploading our topology to HDInsight. So we shall proceed in creating a Storm topology on H… Read More
2017-02-23 08:00
Friction can be a very powerful force when building software. The things that are made easier or harder can dramatically influence how we work. I’d like to discuss three areas where I… Read More
2017-02-23 05:00
Apache Storm is a free and open source distributed realtime computation system running on the JVM. To get started we will implement a very simple example. Previously we implemented a word co… Read More
2017-02-22 20:00
Few programmers explicitly intend to write poorly structured source code. They don’t sit down, whip out their Bad Code Design Patterns book, and wreak meticulous spaghettipocalypse. Ra… Read More
2017-02-22 17:00
This is a real story, and it’s not only about Google. I’m getting emails from recruiters at Amazon, Facebook, and smaller Silicon Valley startups. They find me somehow, most like… Read More
2017-02-22 14:00
A smart card is a device that holds a private key securely without letting it out of its storage. The chip on your credit card is a “smart card” (yup, terminology is ambiguous &n&hell…Read More
2017-02-21 08:50
This guide will show you: the what: after a definition we will look into 19 examples of DSLs the why: what are the concrete benefits you can achieve using DSLs the how: we will discuss the d… Read More
2017-02-21 05:00
This is one of the easier coding tasks, but you still can meet it in some preliminary tech screening. The problem looks like this: Given a string containing just the characters '(', ')'… Read More
2017-02-20 20:00
It kind of feel like the hype for Microservices is slowly coming down to earth and our industry is starting to realise, that a system according to the architectural paradigms behind Microser… Read More
2017-02-20 17:00
Most performance issues can be solved in several different ways. Many of the solutions applicable are well-understood and familiar to most of you. Some solutions, like taking certain data st… Read More
2017-02-20 14:00
Does this sound disturbing? You try to reach a particular website only to find the site is down. But it’s not that simple. You try another site – also not reachable. And an… Read More
2017-02-20 11:10
Previously we set up a Scala application in order to execute a simple word count on hadoop. What comes next is uploading our application to HDInsight. So we shall proceed in creating a Hadoo… Read More
2017-02-20 08:00
Hadoop is a great technology built with java. Today we will use Scala to implement a simple map reduce job and then run it using HDInsight. We shall add the assembly plugin on our assembly.s… Read More
2017-02-20 06:56
Looking for a powerful, yet simple, Java IDE ? Then we have something especially for you! We are running a contest giving away 3 FREE licenses for the amazing IntelliJ IDEA IDE. Every aspect… Read More
2017-02-20 06:52
Learn the Tricks of the Linux Systems Administration Trade & Prepare for Top Certification Exams Hey fellow geeks, This week, on our JCG Deals store, we have an extreme offer. We are off… Read More
2017-02-20 05:00
Previously, we discussed the main reasons why Docker can be useful to the enterprise. So why aren’t all large companies using Docker already? A large part of the reason are the misconc… Read More
2017-02-16 14:00
The Language Server protocol is used between a tool (the client) and a language smartness provider (the server) to integrate features like auto complete, goto definition, find all references… Read More
2017-02-16 05:00
I’ve said before that your StackOverflow reputation is very important to us when we make a decision on how much we should pay a software developer. However, there were many complaints… Read More
2017-02-15 20:00
Erlang has been around for over 30 years and was built well before multi-core CPUs existed. Yet it’s a language that couldn’t be more relevant today! The underlying architecture… Read More
2017-02-15 17:00
If you search for Software Developer Archetypes you’ll find a large number of perspectives on this ranging from serious and helpful to lighthearted to frankly…kinda mean. I&rsqu&hell…Read More
2017-02-15 14:00
A quick way to get a robust OAuth2 server running in your local machine is to use the excellent Cloud Foundry UAA project. UAA is used as the underlying OAUth2 authorization server in&n&hell…Read More
2017-02-14 14:00
At Keyhole Software we are in large part a modernization company. We have consultants who specialize in moving old to new, renovating dilapidated code bases, and designing brighter futures f… Read More
2017-02-14 11:00
Why can’t production logs help you find the real root cause of your errors? Asking if you’re using log files to monitor your application is almost like asking… do you drin… Read More
2017-02-14 08:00
Previously we went through an introduction on JPA caching, the mechanisms and what hibernate offers. What comes next is a hibernate project using Hazelcast as a second level cache. We will u… Read More
2017-02-14 05:00
One of the greatest capabilities of HazelCast is the support for hibernate’s second level cache. JPA has two levels of cache. The first level cache caches an object’s state for t… Read More
2017-02-13 20:00
Sometimes it happens that people speak different languages. Even when speaking the same language. People have their own professional inclinings. Biologist may see the world as the way a cell… Read More
2017-02-13 17:00
One of the great things about 3D printing is that you can print an entire model in one go. The typical example is the fully assembled “print-in-place” ball bearing as shown in th… Read More
2017-02-13 14:00
1. Introduction Effective, fast and accurate search functionality is an integral part of vast majority of the modern applications and software platforms. Either you are running a small e-com… Read More
2017-02-13 11:00
Oracle Container Cloud Service is Oracle’s entry into the the world of managed container service. There are plenty of existing options: Docker for AWS or Azure Amazon Elastic Cont… Read More
2017-02-13 08:00
In this blog we will discuss some patterns which are often used in microservices applications which need to scale: Event Stream Event Sourcing Polyglot Persistence Memory Image Command Query… Read More
2017-02-13 06:46
Solve App Problems 10x Faster with AppDynamics – Monitor production apps at code-level depth with minimal overhead. Start a FREE Trial! “No provision need be made for the user to… Read More
2017-02-13 06:39
Get Certified In the AWS Management Console & Boost Your Career Prospects Significantly Hey fellow geeks, This week, on our JCG Deals store, we have an extreme offer. We are offering the… Read More
2017-02-13 05:00
Software development is rife with copy & paste: all of us resort to copy and paste coding sometimes. We know we probably shouldn’t, but we do it anyway. It’s like the industr… Read More
2017-02-08 14:00
In my previous post I described how I started a continuous delivery stack with one simple command. The next step is to prepare the stack to build and deploy an application in an automated wa… Read More
2017-02-08 11:00
This is a second post in series describing our recent infrastructure / architecture transition in Plumbr. The first part focused upon event capturing part of the architecture. In the current… Read More
2017-02-08 08:00
In this week’s Whiteboard Walkthrough, Dale Kim, Sr. Director of Industry Solutions at MapR, describes how MapR addresses the challenge of providing a persistence tier to containers in… Read More
2017-02-08 05:00
Do you have private static methods that help you break your algorithms down into smaller parts? I do. Every time I write a new method, I realize that it can be a new class instead. Of course… Read More
2017-02-07 20:00
Recently, I’ve done a management workshop on TDD. The audience was developmenet managers and team leads. Most of them did not know TDD. (Actually, most thought they knew what TDD was… Read More
2017-02-07 11:00
Docker is a relatively new and rapidly growing project that allows creating very light “virtual machines”. Prerequisites There are no specific skills needed for this tutorial bey… Read More
2017-02-07 05:00
I was recently involved in quite a long Twitter discussion regarding Java’s Optional, type systems that distinguish nullable and non-nullable types and the the Elvis operator, which al… Read More
2017-02-06 17:00
This post describes how to create an IoT project using Arduino sensor. You will learn how easy is creating an IoT app that monitors gas in a room using Arduino sensors and send a notificatio… Read More
2017-02-06 14:00
On a previous blog we integrated a spring boot application with EC2. It is one of the most raw forms of deployment that you can have on Amazon Web Services. On this tutorial we will create a… Read More
2017-02-06 11:00
When it comes to application infrastructure, containerization is king. What was once the hot new thing in the DevOps wild west is now maturing into a more stable and widely adopted technolog… Read More
2017-02-06 08:00
“Lambda architecture is a data-processing architecture designed to handle massive quantities of data by taking advantage of both batch– and stream-processing… Read More
2017-02-06 05:00
There is plenty of material on microservices, just google it! I gave a presentation on refactoring monolith to microservices at Devoxx Belgium a couple of years back and it has&nbs&hell…Read More
2017-02-02 20:00
Users As its name suggests, a user story describes how a user or customer uses the product–a digital product is captured from the perspective of the users. This avoids a solution… Read More
2017-02-02 17:00
Throughout the lifecycle of a company the IT architecture is bound to change multiple times. There can be many different reasons for such changes. One of the worst reasons for such change ca… Read More
2017-02-02 14:00
I’m the stupid one. For years now I’ve heard people talk about “digital” but I failed to grasp the significance. It started with “digital agencies” which… Read More
2017-02-01 20:00
Recently I’ve been asked by an HR person to tell which factors influence Java programmers wanting to change a job, what is important when we consider a change. I gave it a great d… Read More
2017-02-01 17:00
In this week’s Whiteboard Walkthrough, Ted Dunning, Chief Applications Architect at MapR, will talk about how you can use logs containing metrics and exceptions to detect anomalies in… Read More
2017-02-01 14:00
It happens to the best of us, you are writing some code in a Language that you use sporadically and you start asking yourself what is the correct syntax for this or that. You know… Read More
2017-02-01 11:00
Sometimes Very often I need a class that implements an interface by making an instance of another class. Sound weird? Let me show you an example. There are many classes of that kind in… Read More
2017-01-31 17:00
At the end of my last article, I left you hanging after describing activities, without telling you how to build a UI, so here we go. In the Android SDK, layouts are separate from the Java co… Read More
2017-01-31 14:00
Need a little spring in your step? Tired of all those heavy web servers and deploying WAR files? Well you’re in luck. Spring Boot takes an opinionated view of building production-ready… Read More
2017-01-31 11:00
As part of a Go script I’ve been working on I wanted to write to a CSV file from multiple Go routines, but realised that the built in CSV Writer isn’t thread safe. My first attem… Read More
2017-01-30 14:00
I recently shared this article on twitter from HBR, True Leaders Believe Dissent is an Obligation – the spirit of which I wholeheartedly agree. Effective leaders should not be surround… Read More
2017-01-30 11:00
One of the items that caught my eye from the announcement of the new Spring Data release train named Ingalls was that the Spring Data Cassandra finally supports Cassandra 3+. So I revis… Read More
2017-01-29 12:17
Manipulate Data Like a Pro & Score High-Paying Jobs by Learning to Leverage Python’s Considerable Power Hey fellow geeks, This week, on our JCG Deals store, we have an extreme offe… Read More
2017-01-27 11:00
The Mayor of Philadelphia recently signed a measure that would ban Philly employers from asking candidates about their salary history. The intent of the bill is to curb wage discriminat… Read More
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