2016-06-20 16:00
Recently I’ve written about implementation-related names and I’ve presented a few examples where the method name was incorrect because of its strong relation with the body. At on… Read More
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2016-06-20 13:00
There are many ways to work with git. The workflows vary depending on the size of the team, organization, and on the way of working – is it distributed, is it sprint-based, is it a com… Read More
2016-06-20 10:00
Automated configuration management tools like Ansible, Chef and Puppet are changing the way that organizations provision and manage their IT infrastructure. These tools allow engineers to pr… Read More
2016-06-20 07:00
Java developer? Takipi replaces logging in production JVMs and lets you see the source code, call stack, and variable state behind all logged errors, warnings, and exceptions – Try Tak… Read More
2016-06-20 07:00
The Google GitHub-hosted project AutoValue is interesting for multiple reasons. Not only does the project make it easy to write less Java code for “value objects,” but it also pr… Read More
2016-06-20 04:00
So you’ve decided that identity isn’t enough for you and wrote a nice equals implementation? Great! But now you have to implement hashCode as well. Let’s see why and how to… Read More
2016-06-19 14:06
From Installation to Administration–118 Hours of Training to Become a Linux Pro Hey fellow geeks, This week, on our JCG Deals store, we have an extreme offer. We are offering the Compl… Read More
2016-06-19 12:00
In this post, I will dig into the details of how to diff revisions and create patches with JGit. Starting from the high-level DiffCommand all the way down to the more versatile APIs to find… Read More
2016-06-17 10:00
1. Introduction For many experienced Java developers, Scala programming language is not a stranger. It’s been around for quite a while now (officially, since first public release in 20… Read More
2016-06-14 19:00
Refactoring anonymous classes (that implement one single method) to lambda expressions, makes your code more succint and readable. For example, here’s an anonymous class for a Runnable… Read More
2016-06-14 16:00
Recently in one of my project I got a requirement to execute a fallback call for a failing webservice call. To implement the same I was looking for some implementation of circuit breaker pat… Read More
2016-06-14 13:00
In the previous parts of this post, we discussed about Futures and Promises. In this last part, we’ll compose Futures using its powerful combinators. Composing Futures : In the first p… Read More
2016-06-14 10:00
This time I will start with a code sample. Take a look at this: if (code.isComplexOrUnreadable()) { refactor(code); } Can you tell me what is wrong with this code? No? Let me ask you another… Read More
2016-06-14 08:00
Professional certification is always a bit of a controversial subject, with benefits vs. cost/time debated by those who are eligible. With Oracle’s Java certifications, I hold th… Read More
2016-06-14 07:00
If you recall my post entitled Java EE 8: What is the Current Status, it is apparent that the progression on Java EE has certainly slowed down over the past several months. There… Read More
2016-06-14 04:00
Are you ready to rumble? Prepare for the battle of the dashboards There is a great number of monitoring applications in the market, each meant to help you understand what’s going on in… Read More
2016-06-13 22:00
I know I said I wouldn’t put up a post until I got the videos done, but this has been nagging at me. As for an update on the videos, I’ve been partially lazy, partially busy, but… Read More
2016-06-13 19:00
Drill is a fantastic tool for querying JSON data. But Drill isn’t magical, and sometimes it runs into some data that it can’t quite handle (yet). This post walks through an examp… Read More
2016-06-13 16:00
When we think about the discussion about estimates and #noestimates, I have one big question: Where do you want to spend your time? In projects, we need to decide where to spend our time. In… Read More
2016-06-13 13:00
Following my introduction blog about why microservices should be event-driven, I’d like to take another few steps and blog about it while I prep for a bunch of talks I’ve got com… Read More
2016-06-13 10:00
During the Software Craftsmanship and Testing conference UK, Mash run a session on AWS Lambda, with examples written in Java and python. Some other people also tried to do it in NodeJS. This… Read More
2016-06-13 07:22
Get Paid to Breach Cyber Security Systems—148+ Hours of Training to Jumpstart Your High-Paying IT Career Hey fellow geeks, This week, on our JCG Deals store, we have an extreme offer… Read More
2016-06-13 07:00
In the first part of this series, I said I liked order-of-magnitude estimates. I also like targets in lieu of estimates. I’ll say more about how estimates can be useful in part 3. In t… Read More
2016-06-13 04:00
A fundamental aspect of any Java class is its definition of equality. It is determined by a class’s equals method and there are a couple of things to be considered for a correct implem… Read More
2016-06-12 12:00
When it comes to scheduling jobs in a java application, Quartz is the first tool that comes into consideration. Quartz is job scheduler backed up by most popular RDBMSes. It is really c… Read More
2016-06-11 12:00
This is the sixth post in the series about integrating sync clients with async systems (1, 2, 3, 4, 5). Here we’ll see how to test Akka actors with different testing styles. Unit vs In… Read More
2016-06-10 19:00
Spark Streaming Testing How do you create and automate tests of Spark Streaming applications? In this post, we’ll show an example of one way in Scala. This post is heavy on… Read More
2016-06-10 16:00
When a business is getting off the ground or a startup is launching, it’s understandable that money will be tight and cash flow all but nonexistent. There’s a tangible sense of u… Read More
2016-06-10 13:00
In this week’s Whiteboard Walkthrough, Ellen Friedman, a consultant at MapR, talks about how to design a system to handle real-time applications, but also how to take advantage of stre… Read More
2016-06-10 10:00
In Part 1, I discussed order-of-magnitude estimates and targets. In part 2, I said how estimates can be misused. In this part, I’ll discuss when estimation is useful. Here are several… Read More
2016-06-09 19:00
tinylog is a lightweight logging framework for Java. In opposite to Apache Log4j and Logback, tinylog consists of a single JAR file of only 80KB without any dependencies and has a static log… Read More
2016-06-09 16:00
The current edition of the Java magazine has an article about Big Data Best Practices for JDBC and JPA by Josh Juneau: http://www.javamagazine.mozaicreader.com/MayJune2016 The article s… Read More
2016-06-09 13:00
What is Apache Kafka? Apache Kafka is an open-source, distributed, scalable publish-subscribe messaging system. The organization responsible for the software is the Apache Software Fou… Read More
2016-06-09 10:00
This week we have a four page Java developer resume that needs help in a bunch of places. Again, I’ve redacted the content to protect the innocent. SUMMARY The resume started with a SU… Read More
2016-06-09 07:00
“SQL? Isn’t that just something my ORM tools use?” Often application developers can and should remain at least one level removed from SQL. JPA and the Entity Framework each… Read More
2016-06-09 04:00
The Pareto logging principle: 97% of logged error statements are caused by 3% of unique errors We received a lot of feedback and questions following the latest data crunching post where we s… Read More
2016-04-24 11:19
60+ Hours, 5 All-Level Courses: Become a Java Programming Pro Hey fellow geeks, This week, on our JCG Deals store, we have an extreme offer. We are offering The Java Developer Course Bundle… Read More
2016-04-22 16:00
Inserts, updates and deletes. Every framework tutorial starts with these and they are seen as the most basic functionality that just works. But what if two concurrent requests try to modify… Read More
2016-04-22 13:00
Continuing my discuss of management, broadly speaking my argument is: There is management work to do – the same as there is coding, testing and customer understanding. To pretend there… Read More
2016-04-22 10:00
Ceylon already runs on the JVM, whether bare-bones, via JBoss Modules, Vert.x, Java EE Servlet containers such as WildFly, or OSGi containers, as well as on JavaScript VMs such as Node.js an… Read More
2016-04-22 07:00
Think application performance and reliability is the same? Think again. Are performance and reliability related? Or are these things mutually exclusive? I think the latter. Today, the… Read More
2016-04-22 04:00
According to the Single Responsibility Principle each unit in our code should have only one reason to change. Code Review, on the other hand, is a technique that helps us improve t… Read More
2016-04-21 19:00
Welcome to the jOOQ Tuesdays series. In this series, we’ll publish an article on the third Tuesday every other month where we interview someone we find exciting in our industry from a… Read More
2016-04-21 16:00
A few days ago a new feature was committed to the Eclipse repository: Terminate and Relaunch. When enabled, Eclipse will terminate all currently running processes of a launch configuration b… Read More
2016-04-21 13:08
This blog post is the result of my efforts to show to a coworker how to get the insights he needed by using the streaming capabilities and concise API of Apache Spark. In this blog post, you… Read More
2016-04-21 10:00
In the last post of the Missing Features Survey series I said that this post would be about missing features in CSS and FXML. Now it turns out that the survey submissions did not contain any… Read More
2016-03-01 05:00
” How parallel execution of blocking “side-effect only” (aka void) tasks became easier with Completable abstraction introduced in RxJava 1.1.1. “ As you may have noti… Read More
2016-02-29 23:00
Many modern web applications are moving towards the use of stateless communications using HTTP. The REST (Representational State Transfer) architectural style is oftentimes utilized to… Read More
2016-02-29 20:00
Docker Toolbox is cool! It is a single point download that gives you everything to get started with Docker. But it comes with other tools like VirtualBox and Kitematic which you ma… Read More
2016-02-29 17:00
To open up Kotlin Month, we’ll look at a small assortment of Kotlin’s features that aren’t big enough to merit their own post and don’t fit into a grouping for the up… Read More
2016-02-29 14:00
Let’s forget for a few minutes our roles, our titles, our fancy LinkedIn profiles and our one-liner twitter tags. I do not exclude myself who has spent several hours to come up with a… Read More
2016-02-29 11:00
SLF4J is a very popular logging facade but, like all libraries we use, there is a chance that we use it in a wrong or at least in a not optimal way. In this tutorial we will list common logg… Read More
2016-02-29 09:58
Amazon WEB Services provide us with the SQS messaging service. The java sdk for sqs is compatible with JMS. Therefore instead of using SQS as a simple spring bean we can integrate it with th… Read More
2016-02-29 08:00
This has caught me by surprise. After studying the Kotlin language to learn about how to best leverage this interesting new language for jOOQ, I stumbled upon this puzzler. What do you think… Read More
2016-02-28 23:00
If you’re programming in more advanced languages like Scala or Ceylon, or even JavaScript, “nested functions” or “local functions” are a very common idiom to yo… Read More
2016-02-28 13:00
Couchbase Docker images are always at hub.docker.com/_/couchbase/. Complete instructions to run Couchbase Docker Container are available at docs.docker.com/engine/examples/cou… Read More
2016-02-27 13:00
Overview A common question we get is; What makes a low latency application different? What is it like to read? There is a number of considerations in designing a low latency application whic… Read More
2016-02-26 21:12
Smart mobile teams know that developing and releasing a mobile app is just the first step in the long journey to delivering a successful and 5-star mobile app. If you have to make your app s… Read More
2016-02-26 20:00
Negotiating job offers is a skill, and many are reluctant to even attempt it. Like interviewing, negotiation is something that most professionals may only do a few times (or less) a decade… Read More
2016-02-26 17:00
I’m continuing my theme of management from my January blog (“It takes an engineer to manage engineering”) we need to clear up some terminology. I often hear form people at… Read More
2016-02-26 14:00
This time we are going to talk a little bit about JAX-RS 2.0 APIs and touch on one very interesting aspect of the specification: dynamic features and how they are useful. Traditionally, when… Read More
2016-02-26 11:20
Take a look at the code you work in day-to-day. How long has it been there? How old is it? Six months old? A year? Maybe five years old? Ten? Twenty?! How much of the code is old? Less than… Read More
2016-02-25 20:00
I like processing code for several purposes, like static analysis or automated refactoring. The interesting part to me is to reason on the models you build from the Abstract Syntax Tree… Read More
2016-02-25 14:00
Editor’s Note: Don’t miss our new free on-demand training course about how to create data pipeline applications using Apache Spark – learn more here. Decision trees ar… Read More
2016-02-25 10:50
First, thanks to everyone who took the time to complete the Developer Happiness Survey originally posted at DZone. I can safely conclude from the >500 responses t… Read More
2016-02-24 17:00
Java EE 7 is around for a few years already, and provides several very useful and long-awaited features, like entity graphs and better support for stored procedures and results mapping. For… Read More
2016-02-24 14:00
In my previous blog post Improved Documentation of HotSpot Options in Java 8, I wrote about the misunderstandings surrounding the HotSpot JVM‘s default setting for non-standard option… Read More
2016-02-24 11:00
Patrick McFadin, Chief Evangelist for Apache Cassandra, DataStax Patrick is regarded as one of the foremost experts of Apache Cassandra and data modeling techniques. As the Chief Evangelist… Read More
2016-02-24 08:00
In the previous two posts we saw how to work with query and path parameters in the upcoming Java EE MVC framework. This post focuses on form parameters. When you submit a web form using a po… Read More
2016-02-24 06:19
Systems integration has been a tough problem from the beginning of the use of software systems in the enterprises. This had taken many faces in the last coupe of decades and is still evolvin… Read More
2016-02-23 23:00
Summary Product scorecards are an important product management tool: They help you track the performance of your product. Unfortunately, many scorecards show only financial and customer key… Read More
2016-02-23 20:00
A normal person would expect that sharing free content doesn’t create controversy. Well this normal person is wrong. A couple of weeks back I shared a report on #NoEstimates… Read More
2016-02-23 17:00
In the beginning of February, the JUnit 5 (aka JUnit Lambda) team has published an alpha release. Since JUnit 4 is among the most used items in my toolbox I thought it might be wor… Read More
2016-02-23 08:12
1. Introduction In this tutorial, we will learn to implement a contract-first SOAP service application using JAX-WS, Spring and Maven. This is more of a design decision whether to use c… Read More
2016-02-23 05:00
It goes without saying that every object needs to be created before it can be used. It does not matter whether we are talking about a domain, frameworks, libraries or any other type of the c… Read More
2016-02-22 23:00
JDK 9 introduces a new feature called Compact Strings. Given the ubiquity of Strings in Java programs I feel that this is a really important change that needs to be understood by all J… Read More
2016-02-22 20:00
A while back I had tried out a small Spring Boot based sample with Scala as the language and found that the combination works out quite nicely – no big surprises there actually a… Read More
2016-02-22 17:00
As an application developer or architect tasked with exploring the possibilities that containerized applications offer, there is little help with getting all the tools together to get you st… Read More
2016-02-22 14:22
I’ve been practicing #NoEstimates with my teams for the last 2-3 years if you want to know how it worked for us, read below. First of all an answer to all the people that in these year… Read More
2016-02-22 11:00
Grails 3 has new configuration files and format. The new format is based on YAML and the file name to use for database configuration is grails-app/conf/application.yml. I’… Read More
2016-02-22 08:00
In November 2015 the JUnit Lambda team presented their prototype. Since then the project rebranded itself as JUnit 5 and released an alpha version in February 2016. We’ll explore it in… Read More
2016-02-22 05:00
Today we at MapR would like to congratulate Apache Arrow, a cross system data layer to speed up big data analytics and a brand new addition to the Apache Open Source Software community  &hell…Read More
2016-02-21 23:00
Before we release camunda BPM OSGi 2.0 I want to do a little bit more of advertisement for it and show what is possible with the new version. One change in the new version will be, that it d… Read More
2016-02-21 13:00
As with most things in software development the ultimate currency for comments is time. How much do we have to invest and how much do they save us? Or in other words: What are the costs and… Read More
2016-02-20 13:00
IMDG or In memory data grid is not an in-memory relational database, a NOSQL database or a relational database. It is a different breed of software datastore. The data model is distributed a… Read More
2016-02-19 20:00
The Story Once upon a time there was an application that was running on some server and the client functionality was implemented in HTML/CSS and JavaScript. The application was serving trill… Read More
2016-02-19 17:00
A pretty typical setup – spring/hibernate application that requires a distributed cache. But it turns out not so trivial to setup. You obviously need cache. There are options to do tha… Read More
2016-02-19 14:00
I have so much chaos in my life, it’s become normal. You become used to it. You have just to relax, calm down, take a deep breath and try to see how you can make things work rather tha… Read More
2016-02-19 11:00
Have you been writing a lot of code following the Mute-Design-Pattern™ lately? E.g. try { complex(); logic(); here(); } catch (Exception ignore) { // Will never happen hehe System.exit… Read More
2016-02-19 09:48
I see a lot of six-page (or n-page where n >2 for nearly everyone) resumes on any given day, whether in my capacity as a retained recruiter servicing software companies or via my side pro… Read More
2016-02-18 20:00
This is an example for a Bidirectional relationship between Java entities in a REST web service with the Jackson API. Assume we have a bidirectional relationship between two entities Parent… Read More
2016-02-18 17:00
In this example, I will show how to integrate DynamicReport and JasperReports with Servlet and CDI. Tools: TIBCO Jaspersoft Studio-6.0.4.final. Eclipse Luna Service Release 2 (4.4… Read More
2016-02-18 14:00
One of my blog follower sends an email asking me to show an example of “RealWorld Usage of Spring AOP”. He mentioned that in most of the examples the usage of Spring A… Read More
2016-02-18 11:00
The Java EE Security API (JSR 375) is moving forward, as summarised by Arjan Tijms here: http://arjan-tijms.omnifaces.org/p/whats-new-in-java-ee-security-api-10.html. One thing to note… Read More
2016-02-18 08:12
This post will show how to build a REST API with Elixir and Phoenix Framework. The focus will be providing CRUD (create, read, update, delete) endpoints for a model which is persisted to a P… Read More
2016-02-18 05:00
SpringBoot provides lot of starter modules to get up and running quickly. SpringBoot’s auto-configure mechanism takes care of configuring SpringBeans on our behalf based on various cri… Read More
2016-02-17 23:00
Redis transactions allow to group multiple commands and to execute them sequentially. The whole transactional state is isolated from other users and becomes visible once a transaction is com… Read More
2016-02-17 20:00
Welcome to the jOOQ Tuesdays series. In this series, we’ll publish an article on the third Tuesday every other month where we interview someone we find exciting in our industry from a… Read More
2016-02-17 17:00
Before I move on with the actual article, I’d like to give credit to Daniel Dietrich, author of the awesome Javaslang library, who has had the idea before me: &nbs&hell…Read More
2016-02-17 14:00
In 2015, General Stan McChrystal published Team of Teams, New Rules of Engagement For a Complex World. It was the culmination of his experience in adapting to a world that had changed faster… Read More
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