2018-03-01 08:00
We had centralized applications. We introduced with distributed applications. Now, we have decentralized applications. Will it replace the whole system? I remember the emerge of NoSQL databa… Read More
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2018-03-01 05:00
Spock is a testing and specification framework for Java and Groovy applications. Spock is: Extremely expressive Facilitates the Given / When / Then syntax for your tests compatible wit… Read More
2018-02-28 20:00
In one of my previous posts I showed how to run an ADF essentials application on Tomcat in a docker container. I am using this approach primarily for sample applications as a convenient way… Read More
2018-02-28 17:00
Because Java-based applications are often used in a wide variety of operating systems and environments, it is not uncommon for Java developers to run into issues related to character-based i… Read More
2018-02-28 14:00
If you read my scaling agile series, you can see that becoming an agile organization requires seeing your organization as a system with a culture. You can start with teams, move to programs… Read More
2018-02-28 11:02
Overview The purpose of the executable model is to provide a pure Java-based representation of a rule set, together with a convenient Java DSL to programmatically create such model. The mode… Read More
2018-02-28 08:00
This post is the second part of a 3 post series exploring ways to enable SSO with an OAuth2 provider for Spring Boot 2 based applications. The 3 posts are: 1.Ways to bootstrap an OpenID Conn… Read More
2018-02-28 05:00
It all started when the Egyptians slid a few marbles on a wooden frame to ease up on their brains in simple arithmetic; or perhaps when the Greeks invented the Antikythera Mechanism to track… Read More
2018-02-27 23:00
JDK 7 introduced a new method on the java.lang.System class called lineSeparator(). This method does not expect any arguments and returns a String that represents “the system-dependent… Read More
2018-02-27 20:00
Hello Friends, If you have used Spring framework previously, you must be aware that it takes some genuine effort to even get started with basic Spring functionality.With Spring Boot, th… Read More
2018-02-27 17:00
Up until now we had a look on the single responsibility, open/closed, liskov substitution and interface segregation principles. Dependency Inversion is one of the last principle we are gone… Read More
2018-02-27 14:00
Previously we examined the liskov substitution principle. Next principle is the interface-segregation. The interface-segregation principle (ISP) states that no client should be forced to dep… Read More
2018-02-27 13:59
Course Overview Docker is a computer program that performs operating-system-level virtualization also known as containerization. It is developed by Docker, Inc. Docker is primarily developed… Read More
2018-02-27 11:00
Previously we took a dive into solid principles including the single responsibility and the open/closed principle. The Liskov substitution principle (LSP) is a particular definition of a sub… Read More
2018-02-27 09:17
This article is part of our Academy Course titled Docker Tutorial for Java Developers. In this course, we provide a series of tutorials so that you can develop your own Docker based applicat… Read More
2018-02-26 23:00
Previously we talked about the single responsibility principle. The open/closed principle is the second principle in the row regarding the solid principles acronym. “Software entities… Read More
2018-02-26 20:00
The single responsibility principle is the first principle from the solid acronym. “A class should have only one reason to change.” Every module or class should have responsibili… Read More
2018-02-26 17:00
Agile culture is about the ability to change. (You need to know why you want to change, but once you know that, agile cultures promote change.) We (as agile teams and organizations) deliver… Read More
2018-02-26 14:07
Java 9 brings various improvements to the Process API, used for controlling and managing operating system processes. Getting information about a process There is a new ProcessHandle class wh… Read More
2018-02-26 10:28
Get Lifetime Access to 16 Best-Selling JavaScript Books & 30 Hours of Course Content to Start Building Your First Websites Hey fellow geeks, This week, on our JCG Deals store, we have an… Read More
2018-02-26 07:59
Discover faster, more efficient performance monitoring with an enterprise APM product learning from your apps. Take the AppDynamics APM Guided Tour! The AppDynamics End User Monitoring produ… Read More
2018-02-24 13:00
Introduction to an Agile Transformation series… I’ve seen several agile transformation challenges. Since I want to address those challenges, this is a series of posts about agil… Read More
2018-02-23 20:00
Apache Beam is an open source, unified model for defining both batch and streaming data-parallel processing pipelines. Using one of the open source Beam SDKs, you build a program that define… Read More
2018-02-23 17:00
Writing asynchronous code is hard. Trying to understand what asynchronous code is supposed to be doing is even harder. Promises are a common way to attempt to describe the flow of delayed-ex… Read More
2018-02-23 14:00
Apache Gearpump is a real-time big data streaming engine. It conceived at Intel in mid-2014 as an open source project on GitHub from start and entered Apache incubation on March 8t… Read More
2018-02-23 11:00
There is some documentation on how to add JRebel to a Spring Boot app that uses Gradle as the build tool. It is basic but works fine. All you have to do is to add a few lines to build.gradle… Read More
2018-02-23 08:00
SpringBoot is the most popular and widely used Java framework. Occasionally this discussion of “Why is SpringBoot so popular?” come between me and my friends/colleagues… Read More
2018-02-23 05:00
Microservices allow us to go faster and reduce our time to value. However, we cannot just naively move fast and break things. We need a way to reduce the risk of making changes and in doing… Read More
2018-02-22 23:00
Yo! C’mere. Lookn’ for somethn’? Serverless, ya? Up there. Go strait, ‘n take a right at da “Sigma” sign. (Well, don’t blame us yet; at least we tho… Read More
2018-02-22 20:00
“It’s stupidity. It’s worse than stupidity: it’s a marketing hype campaign.” ‐ Richard Stallman commenting on cloud computing, Sep 2008 And, after 10 year… Read More
2018-02-22 17:00
I’ve felt for a long time that, for most Java classes that have distinguishing attributes, developers should take the time to override Object.toString(), even if it’s just with a… Read More
2018-02-22 14:00
I’m aware this is going to be a very niche topic. Electronically signing PDFs is far from a mainstream usecase. However, I’ll write it for two reasons – first, I think it w… Read More
2018-02-22 11:00
RabbitMQ is one of the popular message broker solutions and provides client libraries to be used from various programming languages including Java, Scala, .NET, Go, Python, Ruby, PHP et… Read More
2018-02-22 08:00
Back in 2015 I wrote a couple of articles about how you can piggyback a standard Java EE Transaction Manager to get data consistency across distributed services (here is the original article… Read More
2018-02-22 05:00
A popular question on StackOverflow.com is, “How can a Java program get its own process ID?” There are several answers associated with that question that include parsing the Stri… Read More
2018-02-21 23:00
This error means your code or any external library you are using in your application is using the SLF4J library, an open source logging library, but it is not able to find the required… Read More
2018-02-21 20:00
The SecurityContext and SecurityContextHolder are two fundamental classes of Spring Security. The SecurityContext is used to store the details of the currently authenticated user… Read More
2018-02-21 17:00
1. Overview In this tutorial, we will be exploring the basics of how to use Selenium with Java. We will use Selenium to open Google, search, and click a URL. The code is available on Github… Read More
2018-02-21 14:00
Last week, I discovered what helped me deciding on what I have struggled with for a longer time: whether to place operators such as &&, || or + on the same or next line. When constru… Read More
2018-02-21 11:00
Today we are going to have a conversation about REST(ful) services and APIs, more precisely, around one peculiar subject many experienced developers are struggling with. To put things into p… Read More
2018-02-20 23:00
Mark Reinhold‘s post “JDK 10: First Release Candidate” announced “no unresolved P1 bugs in build 43” and named that Build 43 the initial JDK 10 Release Candidat… Read More
2018-02-20 20:10
JDK-8197594 (“String#repeat”) includes the following it its “Description”: “A String method for repeating sequences of characters has been long requested with n… Read More
2018-02-20 17:00
JDK 10 introduces a Javadoc tag {@summary} via issue JDK-8173425 (“Javadoc needs a new tag to specify the summary.”). This new tag allows the developer to explicitly specify what… Read More
2018-02-20 14:00
I believe Spring application shouldn’t be structured in package by layer approach. In my opinion, package by feature makes much more sense. First of all, let me describe each approach… Read More
2018-02-20 11:00
Although the total number of acronyms in the programing industry has probably already exceeded the number of stars observable on the moonless night sky, only a subset has gained popularity a… Read More
2018-02-20 06:42
The Complete GitHub Logging Research: How the World’s Top Companies Choose How and What to Log We all use log files to monitor our applications in production. Some of us prefer using l… Read More
2018-02-20 05:00
How to avoid the risks of mishandling application errors? This one is going to be a bit scary. After all, we’re dealing with a deadly killer here. And some nasty log files. So hold on… Read More
2018-02-19 08:45
Your Path to a Lucrative IT Career Starts with The Ultimate (14 Courses, 140+ Hours!) IT Certification Training Guide Hey fellow geeks, This week, on our JCG Deals store, we have another ext… Read More
2018-02-16 17:00
Ever wondered what it is like inside a lambda? Stop wondering. Let’s find out. Ever since they surfaced in 2014, AWS’s lambda functions have made themselves a steaming hot topic… Read More
2018-02-16 14:00
My motivation My chances of being PM are about as good as the chances of finding Elvis on Mars, or my being reincarnated as an olive. This is what Boris Johnson, British foreign secretary, s… Read More
2018-02-16 11:00
If you are a computer science graduate or someone who is thinking to make a career in software development world or an experienced programmer who is thinking about his next career move but n… Read More
2018-02-15 14:00
During the recent months I’ve been helping a company improving their automated testing practices. Besides doing coaching on TDD I also had the chance to work on a project consisting of… Read More
2018-02-15 11:00
I was on vacation last week, thinking about value. Depending on my role, I might think of value as: Delivery of a feature or story, assuming it’s the right level of quality and when I… Read More
2018-02-14 11:00
At OOP 2018 conference in Munich, I presented an updated version of my talk about building scalable, mission-critical microservices with the Apache Kafka ecosystem and Deep Learning framewor… Read More
2018-02-13 14:00
With Java 8 you are able to repeat the same annotation to a declaration or type. For example, to register that one class should only be accessible at runtime by specific roles, you could wri… Read More
2018-02-13 11:00
In the blog post “JDK 10 Release Candidate Phase“, I looked at the twelve new features that are likely to be part of JDK 10. In this post, I look at some of the APIs that appear… Read More
2018-02-13 08:54
1. Introduction Many companies have been using container-based virtualization to deploy applications (including JVM based ones) in production way before Docker appearance on the horizon. How… Read More
2018-02-13 08:24
Companies and teams want to move fast. This includes frequent releases, constantly updating the product and keep team members on their toes about new and relevant technology. These needs led… Read More
2018-02-13 05:00
I love to write software. And because I’m not a software developer anymore I don’t get much time to do it, and it has always bugged me the incredible amount of work that is neede… Read More
2018-02-12 23:00
A draft JDK Enhancement Proposal (JEP) was created in late 2017 called “Launch Single-File Source-Code Programs” (its associated JDK issue is JDK-8192920). As its name suggests… Read More
2018-02-12 20:00
Here’s the latest MQTT.fx release: MQTT.fx 1.6.0! Support for Google Cloud IoT! A few weeks ago some guys fro… Read More
2018-02-12 17:00
What does trust mean? Should I trust you or not? What if I cannot trust you? Who owns my data? Should I trust the entity which holds my data? These are the questions that should be answered… Read More
2018-02-12 14:00
Integration is boring. And also inevitable. But I won’t be writing about enterprise integration patterns. Instead, I’ll explain how to create an app for integration with Zapier… Read More
2018-02-12 11:00
This will be a 3 post series exploring ways to enable SSO with an OAuth2 provider for Spring Boot 2 based applications. I will cover the following in these posts: 1. Ways to bootstrap a… Read More
2018-02-12 08:45
This 10-Course, 110-Hour Bundle Will Be Your Ticket to a Six-Figure Career in the Booming Project Management Field Hey fellow geeks, This week, on our JCG Deals store, we have another extrem… Read More
2018-02-09 14:00
Hello guys, I have been sharing some REST with Spring tutorials from last a couple of weeks and today, I am going to share some of the frequently asked Spring and REST interview questions to… Read More
2018-02-09 11:00
We’ve been talking about Istio and service mesh recently (follow along @christianposta for the latest) but one aspect of Istio can be glossed over. One of the most important aspects of… Read More
2018-02-08 17:02
Open source software is everywhere in your daily life. You may or not realise it but you use it when you use your smartphone, purchase something from a shop or even in your car. According to… Read More
2018-02-08 14:00
NOTE: The instructions below apply only to the old version of the gwt-maven-plugin At some point in the past, IntelliJ released an update that made it impossible to run the Workbench using t… Read More
2018-02-08 11:00
“The effect you have on others is the most valuable currency there is.” — Jim Carrey At some point in your programming career so far, you might have been asked to “co… Read More
2018-02-07 20:05
In web applications, user session management is very crucial for managing user state. In this article, we are going to learn about what are the approaches we have been following to manage us… Read More
2018-02-07 17:00
A bug is something we find in a software product that “doesn’t look right” (this is my personal definition). A bug can be hidden or visible; it can be “already fixed… Read More
2018-02-07 14:00
As a product manager or product owner, you guide and lead the development team and stakeholders. But you usually don’t have the authority to tell people what to do. Creating alignment… Read More
2018-02-07 11:00
Device only bugs are the worse. You need to go through a device build and reproduce/rinse/repeat. Thankfully these bugs are rare but sometimes they just hit you smack in the face. One such p… Read More
2018-02-07 05:00
The battle between Java and .NET is never ending, find out how differences at the VM-level affect this debate We’ve written extensively on the differences between C# and Java, covering… Read More
2018-02-06 20:00
JDK 9 added some new methods to the Objects class including two static methods highlighted in this post: requireNonNullElse(T,T) and requireNonNullElseGet(T obj,Supplier extends T>… Read More
2018-02-06 17:00
Stephen Colebourne‘s post “Java 9 has six weeks to live” starts, “Java 9 is obsolete in just six weeks.” Colebourne references the Mark Reinhold blog post &ldqu&hell…Read More
2018-02-06 14:00
Hello guys, this is my first article in Java 9 features on this blog and today you’ll learn about my favorite feature “factory methods for collection”, which is introd… Read More
2018-02-06 11:00
If you are a Java programmer and thinking to learn some more programming language to expand your knowledge and skill, but not sure which programming language to choose then you have come to… Read More
2018-02-05 23:00
Getting started with Internet of things using Arduino and Google helps us to explore the new upcoming technological revolution. This tutorial describes how to experiment Internet of things u… Read More
2018-02-05 20:00
With JDK 10 about to enter its release candidate phase, it’s interesting to start looking at what will come after that via JDK 11. As of this writing, four JEPs (JDK Enhancement Propos… Read More
2018-02-05 17:00
Do you need to run a process everyday at the exact same time like an alarm? Then Spring’s scheduled tasks are for you. Allowing you to annotate a method with @Scheduled causing it to r… Read More
2018-02-05 14:00
In one of my previous posts I described how to create a Docker container serving as a builder machine for ADF applications. Here I am going to show how to use this container as a functi… Read More
2018-02-05 11:00
Microsoft SQL Server 2016 has recently taken the lead in relational database management systems (RDBMSs). The combination of high performance, security, analytics, and cloud compatibility ma… Read More
2018-02-05 10:11
Listen to some of our initial thoughts on the new Java release in this webinar There is a lot of hype surrounding the new release of Java 9. Moving the Java platform to modules took close to… Read More
2018-02-05 08:46
With 8 Certification Courses (50+ Hours!), This Bundle is Your One-Stop Track to a Career in the Cloud Hey fellow geeks, This week, on our JCG Deals store, we have another extreme offer. We… Read More
2018-02-02 14:00
In the race of container orchestrators, Kubernetes is surging ahead. But much like when I wrote my post on Docker hosting, people are often stuck on the step of getting their infrastructure… Read More
2018-02-02 11:00
Ever since Google announced Kotlin as the official language for Android development in Google IO 2017, programmers, who want to become an Android Developer are in dilemma. Now the big questi… Read More
2018-02-01 11:00
I am creating a series of video tutorials for PACKT about network programming in Java. There is a whole section about Java NIO. One sample program is to copy a file via raw socket connection… Read More
2018-01-31 14:00
When we build services architectures (Service Oriented Architecture, Microservices, the next incarnation, etc), we end up making a lot more calls over the network. The network is perilous. W… Read More
2018-01-31 11:00
One of the minor additions to JDK 9 that can make a sometimes routine task in Java even easier is the addition of the method InputStream.transferTo(OutputStream). This method, as its name su… Read More
2018-01-31 07:45
Discover the True Power of the Internet By Building 25 Websites & Mobile Apps with Popular Instructor, Rob Percival! Hey fellow geeks, This week, on our JCG Deals store, we have another… Read More
2018-01-30 11:01
REST has now become a standard way to develop web services and when it comes to Java, there are many frameworks and library available e.g. JAX-RS, Restlet, Jersey, RESTEasy, Apache CFX etc… Read More
2018-01-30 09:51
Whether your team is agile or not, whether you envision to build a great agile team, taking baby steps towards that or have no idea what this is, we discovered an awesome tool that will help… Read More
2018-01-30 08:00
The Optional class introduced with Java 8 has been one of the most controversial features introduced by that version of the language. Although I like more things about this new Java class th… Read More
2018-01-30 05:00
Last week I was in Holland helping a client with their agile adoption and digital transformation. When the subject of teams came up I started talking about Minimally Viable Teams. Yesterday… Read More
2018-01-29 23:05
One of the common problem while parsing JSON in Java using Jackson API is that it fails when your JSON contains unknown properties i.e. your Java class doesn’t have all the field corre… Read More
2018-01-29 20:00
One of the common problem while removing elements from an ArrayList in Java is the ConcurrentModificationException. If you use classical for loop with the index or enhanced for loop and try… Read More
2018-01-29 17:00
The term Intellectual Property (IP) refers to any sort of creative work, be it literature, art, or software. In the realm of open source software, artifacts like source code, documentation… Read More
2018-01-29 14:00
Open Liberty is an interesting new OSS Java EE application server that originated from WebSphere Liberty. You can configure Open Liberty to use PostgreSQL as its default data source as follo… Read More
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