2017-11-23 23:00
Transactions In my previous post, I wrote about how to use Transactions in an easy way using Speedment where we updated two bank accounts atomically. As you all might know, transactions… Read More
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2017-11-23 20:00
There are many things a Java developer can do to make his or her own life and the lives of others maintaining that code easier. In this post, I’m going to look at a very easy approach… Read More
2017-11-23 17:00
I am preparing a regular expression tutorial update for the company I work for. The original tutorial was created in 2012 and Java has changed a wee bit since then. There are new Java langua… Read More
2017-11-23 14:00
I have been using Android Studio 3.0 since since the alpha versions, and it is good to see it finally released. This is just some initial comments on using some common and new Android tools… Read More
2017-11-23 11:00
JUnit 5 brings a lot of improvements in the assertions library, mainly thanks to Java 8 and Lambda Expression support and thanks to the presence of the new assertions like assertAll, assertT… Read More
2017-11-22 17:00
Google’s Apps Script framework is really awesome as it helps—newbies and experts alike—to leverage the power of Google (as well as external) services for their day-to-day g… Read More
2017-11-22 14:00
The primary types/objects used for decimal numbers in Java are float/Float, double/Double, and BigDecimal. Each of these has cases in which its “default” string representation is… Read More
2017-11-22 11:00
As the world of software moves on, more complex systems are being developed, which have to integrate with each other. It started with SOA and it continues with microservices. Camel is the nu… Read More
2017-11-22 08:08
This is a very quick introduction to using the excellent Micrometer library to instrument a Spring Boot 2 based application and recording the metrics in Prometheus Introduction Mic… Read More
2017-11-22 05:00
Hello fellow Geeks! Today, we have some exciting news for you! Java Code Geeks and Packt have teamed up to offer you weekly discounts on their extensive library of books. This week, we are o… Read More
2017-11-20 20:00
Amazon Glacier is a secure, durable, and extremely low-cost cloud storage service for data archiving and long-term backup. Glacier offers a cold storage data archival solution meaning the st… Read More
2017-11-20 17:00
With the release of Kubernetes 1.8 Cronjobs have graduated to beta, which means we can now more easily run Neo4j backup jobs against Kubernetes clusters. Before we learn how to write a Cronj… Read More
2017-11-20 14:00
Neo4j Clusters on Kubernetes This posts assumes that we’re familiar with deploying Neo4j on Kubernetes. I wrote an article on the Neo4j blog explaining this in more detail. The Statefu… Read More
2017-11-20 11:00
Introduction Since the Servlet 3 specification web.xml is no longer needed for configuring your web application and has been replaced by using annotations. In this article, we will look at h… Read More
2017-11-20 08:45
The Biggest (140+ Hours!), Baddest Coding Bundle on the Planet Is Back & Better Than Ever for 2018 Hey fellow geeks, This week, on our JCG Deals store, we have another extreme offer. We… Read More
2017-11-17 20:00
Size matters when it comes to software. It has become clear that using small pieces within the microservice architecture delivers more advantages compared to the big monolith approach. The r… Read More
2017-11-17 08:01
Building a Restful API interface using Android Things is useful whenever we have to connect Android Things to an external system. This article explains how to build a Restful API interface u… Read More
2017-11-17 07:04
Introduction to Neural Networks Deep learning encompasses both deep neural networks and deep reinforcement learning, which are subsets of machine learning, which itself is a subset of artifi… Read More
2017-11-17 05:00
Hello fellow Geeks! Today, we have some exciting news for you! Java Code Geeks and Packt have teamed up to offer you weekly discounts on their extensive library of books. This week, we are o… Read More
2017-11-16 17:00
If you’ve been writing test-driven code for even a little while, you’ll know about code coverage (also known as test coverage). If you’re not familiar with the term, here a… Read More
2017-11-16 14:00
The sprint review meeting is maybe the most important Scrum event for product people—it helps you collect feedback and make the right product decisions thereby increasing the chances o… Read More
2017-11-16 11:00
Fail fast or Fail early is a software engineering concept that tries to prevent complex problems happening by stopping execution as soon as something that shouldn’t happen, happen… Read More
2017-11-15 20:00
1. Overview In this article, we will cover how to use CKEditor with Spring Boot. In this tutorial, we will be importing an XML document with numerous data, program the ability to load a… Read More
2017-11-15 17:00
I believe Joshua Bloch said it first in his very good book “Effective Java”: static factory methods are the preferred way to instantiate objects compared with constructors. I dis… Read More
2017-11-15 14:00
I gave you an overview of the TICK stack in a previous article, but here we’ll focus on InfluxDB, a database optimized to store and run time series data. I care about time series for a… Read More
2017-11-15 11:00
Transactions Sometimes we want to make sure that our database operations are executed atomically and separated from other operations. This is where transactions come into play. A transaction… Read More
2017-11-14 05:00
Over the first few parts of the tutorial we went through basics of the Docker and the multitude of the ways to interface with it. It is time to apply the knowledge we have acquired to real-w… Read More
2017-11-13 23:00
With recent Java 9 release we got many new goodies to play with and improve our solutions once we grasp those new features. The release of Java 9 is also a good time to revise whether we hav… Read More
2017-11-13 20:00
What is Apache Kafka? Apache Kafka is a distributed streaming system with publish and subscribe the stream of records. In another aspect it is an enterprise messaging system. It is highly fa… Read More
2017-11-13 17:00
1. Introduction Before we move on to create our demo Spring Boot web application with Gradle, I assume we all are ready with the Gradle setup. Guide to Gradle Setup Gradle Official Website 2… Read More
2017-11-13 14:00
It often happens that developers use words Refactoring and Redesign interchangeably. Why? I think that is because in both cases we are ending with the same result – code that is change… Read More
2017-11-13 11:00
Following on from my last post Separate keyspaces with Spring Data Cassandra we will continue looking into using multiple keyspaces in Cassandra but this time focusing on using a single Cass… Read More
2017-11-13 08:45
Become An Early Adopter of Blockchain Technology in This 4-Course Bundle & Reap the Rewards Hey fellow geeks, This week, on our JCG Deals store, we have another extreme offer. We are off… Read More
2017-11-13 08:13
Over the years I’ve observed an inevitable shift from Eclipse to IntelliJ IDEA. Last year they were almost equal in usage, and I have the feeling things are swaying even more towards I… Read More
2017-11-10 11:00
Introduction reCaptcha by Google is a library used to prevent bots from submitting data to your public forms or accessing your public data. In this post, we will look at how to integrate reC… Read More
2017-11-09 14:00
This is the third article from the series about OpenHub framework – the first introduced OpenHub framework and the second presented asynchronous messaging model. This la… Read More
2017-11-09 11:00
Multi-cloud approaches are taking a bigger share of the market. More than 85% of enterprise IT organizations will commit to multi-cloud architectures by 2018, according to IDC. This will dec… Read More
2017-11-08 14:00
I stumbled upon this proposal by Brian Goetz for data classes in Java, and immediately realized that I too have a few ideas about how to make Java better as a language. I actually have many… Read More
2017-11-08 11:00
Liveness and readiness probes tell Kubernetes whether a pod is running and ready to do some work. An enterprise application can probe the status of an application via HTTP. If no HTTP endpoi… Read More
2017-11-07 23:00
Jersey is the reference implementation of JAX-RS 2.1. The following Jersey dependencies are required in order to run a JAX-RS 2.1 client with JSON-P and JSON-B mapping outside of an enterpri… Read More
2017-11-07 20:00
GlassFish 5.0 represents the reference implementation of Java EE 8. We can dockerize Java EE 8 applications by using a GlassFish base image, such as the official oracle/glassfish. The Docker… Read More
2017-11-07 17:00
Functional Programming (FP) is about avoiding reassigning variables, avoiding mutable data structures, avoiding state and favoring functions all-the-way. What can we learn from FP if we woul… Read More
2017-11-07 14:00
This series on parsing command line arguments in Java has consisted of 29 posts published over four months and covering 28 distinct open source libraries available for parsing command line a… Read More
2017-11-07 11:00
Why should you use a tool for your CI/CD workflow, and which one is the right tool for you? More and more engineering teams are adopting agile development, pushing for shorter and faster rel… Read More
2017-11-07 08:00
In my previous post I set up a network of two nodes running a private blockchain. In this post I use it to create accounts, mine some ether and browse the blockchain with the Mist browser on… Read More
2017-11-07 05:00
Being a Project Manager is not an easy task. Having that role in a company comes with the need of having many skills, both soft and technical. In this article I will show you the basic… Read More
2017-11-06 23:00
Most of us involved in software development are familiar with the term “technical debt”. As a quick reminder, it was introduced by Ward Cunningham to describe the phenomenon that… Read More
2017-11-06 20:00
HashMap works based on hashing algorithm, As per Java doc HashMap has below four constructors, Constructor Description HashMap() Constructs an empty HashMap with the default initial c… Read More
2017-11-06 17:40
Never Build Auth Again – Love building user management? With Okta, you can add social login, multi-factor authentication, and OpenID Connect support to your app in minutes. Create a fr… Read More
2017-11-06 17:00
In my previous post I mentioned a common use case when we need to programmatically check if the current transaction is dirty and notify a user about that before doing somethin… Read More
2017-11-06 14:00
This post looks at the Java 9 Streams API using JShell. The Streams API changes build on the success of Streams in Java 8, and introduce a number of utility methods – takeWhile, dropWh… Read More
2017-11-06 11:00
Many people view encryption as a complicated subject, something difficult to understand. And certain aspects of its implementation can be, but everyone can understand how it works on a highe… Read More
2017-11-06 08:45
This 3-Part (28+ Hours) Bundle Will Help You Build, Automate, & Secure Networks Using Python Hey fellow geeks, This week, on our JCG Deals store, we have another extreme offer. We are of… Read More
2017-11-06 06:53
Discover faster, more efficient performance monitoring with an enterprise APM product learning from your apps. Take the AppDynamics APM Guided Tour! When it comes to deploying agents for you… Read More
2017-11-03 11:00
What is JSON Schema? It provides a thorough way of describing the structure and properties of any JSON value. It is supremely useful in documenting requests made to and responses from any JS… Read More
2017-11-02 11:00
In my previous article I wrote about an input validation design which replaces hard-to-maintain-and-test if-else blocks. However, as some readers pointed out, it has a drawback –… Read More
2017-11-02 08:04
A few months back, I had a conversation with my colleague, Lorenzo Dee, about Service classes. “In many cases, you don’t need them… you can just have inject your Repo… Read More
2017-11-02 07:00
Social media can be a very effective tool at helping your company and brand reach more people. But social media management isn't as simple as it may seem on the surface. It's an art that req… Read More
2017-11-01 14:00
For a while now I’ve been seeing a paradox with Kanban. Specifically, Kanban compared to Scrum. For a team new to Agile – although some regard this as heretical I place Kanban un… Read More
2017-11-01 11:00
I’ve been spending some of my spare time over the last few weeks creating an application that generates running routes from Open Roads data – transformed and imported into Neo4j… Read More
2017-10-31 16:18
This is third-party material. If you’re downloading a whitepaper or ebook for the first time, our distribution service, TradePub, will ask for some personal information in order to hel… Read More
2017-10-31 14:00
Server-Sent Events (or just SSE) is quite useful protocol which allows the servers to push data to the clients over HTTP. This is something our web browsers support for ages but, surprisingl… Read More
2017-10-31 11:00
The idea behind the Agile approach to project management is to encourage collaboration, transparency, and responsiveness to feedback among an integrated team. Agile software development mean… Read More
2017-10-30 11:00
I don’t think it needs introduction about the current hype that is going on with Blockchain, bitcoin, Ethereum and other initiatives. To get more feeling about what it is and how it wo… Read More
2017-10-30 08:45
Grad School is Pricey. Get Around Tuition with Study Materials for Top IT Certifications in This 11-Course Super Bundle Hey fellow geeks, This week, on our JCG Deals store, we have another e… Read More
2017-10-27 19:00
For all the buzz about microservices and API gateways, finding specifics can prove surprisingly difficult. I am reminded of the cartoon by Sidney Harris where the first step of a complex mat… Read More
2017-10-27 16:00
This series on parsing command line arguments from Java has briefly introduced 28 open source libraries that can be used to process command-line arguments from Java code. Even with these 28… Read More
2017-10-27 13:00
Introduction In my previous posts here and here I showed you how to index data into Elasticsearch from a SQL DB using JDBC and Elasticsearch JDBC importer library. In the first article here… Read More
2017-10-27 10:00
Why Our new JavaScript client application regularly calls the /health endpoint of our Grails backend to determine on- of offline state. Things started to become “funny” with it… Read More
2017-10-27 07:00
In this article, we cover how to develop an Android IoT app that uses Android Things. In more details, this Android IoT app will send data, acquired from the sensors, to the cloud. This IoT… Read More
2017-10-27 04:00
The page for getopt4j describes this as “a library to parse command line arguments according to the GNU style.” The page then introduces getopt4j: “The ‘getopt4j&rsqu&hell…Read More
2017-10-26 22:00
java.util.ServiceLoader class loads the service providers/implementations at run time. While compile time ServiceLoader just need to know Service interface. With the Java9 modularity, we can… Read More
2017-10-26 19:00
Many times, IT is overly eager to roll out new software and moves too quickly without adequate testing or a well-thought-out plan in place. In 2016, Alameda County, California introduced new… Read More
2017-10-26 16:02
In order to be able to use transactions with our thread we need to understand how transactions work with spring. Transaction information in spring is stored in ThreadLocal variables. Therefo… Read More
2017-10-26 13:00
Previously we started working with spring and the TaskExecutor, thus we became more familiar on how to use threads on a spring application. However using the task executor might be cumbersom… Read More
2017-10-26 10:00
Using threads in a web application is not unusual especially when you have to develop long running tasks. Considering spring we must pay extra attention and use the tools it already provides… Read More
2017-10-26 04:00
What’s the ultimate alerting strategy to make sure your alerts are meaningful and not just noise? Production monitoring is critical for your application’s success; from going man… Read More
2017-10-25 22:00
Scrum is a simple framework that supports people in making the most of complex challenges. Organizations are re-discovering the sophisticated simplicity of Scrum. The third Scrum Wave is ris… Read More
2017-10-25 19:00
In the first part (part I) we introduced a strategy to bring microservices to our architecture without disrupting the current request flows and business value by looking at a concrete exampl… Read More
2017-10-25 16:00
Introduction Recently I was working for a client trying to remove some GC pauses for a large well crafted Java system. After profiling I realised that most of the garbage was being produced… Read More
2017-10-25 13:00
Almost all applications has one common requirement, they need to send an email notifying something to a registered user. It might be an invoice, a confirmation of an action or a password rec… Read More
2017-10-25 10:00
CLI Parser, originally hosted on and now archived on Google Code, is now available on GitHub. The archive Google Code project page describes CLI Parser as a “very simple to use, very s… Read More
2017-10-24 16:00
There is no reason to have a backend when there is no front-end. There is no reason to have an API when there is no one to consume it. There is no reason to have a class when there is no oth… Read More
2017-10-24 13:00
I became aware of the twenty-sixth featured Java-based library in this series on parsing command line arguments because of a Tweet. CmdOption is described on its main GitHub page as “a… Read More
2017-10-24 10:07
This post continues my exploration of Java9 features from my My Top Java 9 Features blog post. Here we are experimenting with Java9 Collections Static Factory Methods in the List, Set and Ma… Read More
2017-10-24 07:00
Scrum is a simple framework to manage complex challenges. Software delivery is a complex challenge. Software delivery encompasses a multitude of complex activities to create and evolve compl… Read More
2017-10-24 04:00
A while ago I gave a talk at an internal event at Zenika Singapore. We were free to choose a topic so I chose something I thought I didn’t know enough about – what it feels like… Read More
2017-10-23 22:00
Historically the Apache ActiveMQ message broker was originally created in a time where large messages was measured in MB and not in GB as you may do today. This is not the case with the… Read More
2017-10-23 19:00
Following on from my previous post Getting started with Spring Data Cassandra we will look into using multiple keyspaces within an application. This will be a relatively short post due to mo… Read More
2017-10-23 16:00
It’s almost always a good idea to support two-factor authentication (2FA), especially for back-office systems. 2FA comes in many different forms, some of which include SMS, TOTP, or ev… Read More
2017-10-23 13:00
My set-up for the performance test is the following: The sample applications expose an endpoint(/passthrough/mess… Read More
2017-10-23 10:00
I was recently asked to help out on a project with the aim of recommending how to implement some additional event handling functionality. I had a look through the source code and suggested a… Read More
2017-10-23 07:45
Tame Massive Data Sets with 44 Hours of Extensive Hadoop Training Hey fellow geeks, This week, on our JCG Deals store, we have another extreme offer. We are offering a massive 91% off on Big… Read More
2017-10-23 06:47
From the previous parts of the tutorial we already know that Docker not only has an awesome command line tooling, but exposes a feature-rich Docker Engine API as well. As of now, the officia… Read More
2017-10-20 13:00
Writing enterprise software is difficult and as engineers our job is to deliver value for the business within the boundaries of time, budget and resources. Complexity is what makes it diffic… Read More
2017-10-20 10:00
JCommando is described on the JCommando site as “a Java argument parser for command-line parameters.” JCommando reads XML configuration to generate a Java class that handles pars… Read More
2017-10-19 13:00
Let’s dive right in! In the previous post (part I) we set up the context for this blog. Basically, as we introduce a strategy to bring microservices to our architecture, we cannot and… Read More
2017-10-19 10:00
Overview Why convert XML to JSON for raw use in MongoDB? Since MongoDB uses JSON documents in order to store records, just as tables and rows store records in a relational database, we natur… Read More
2017-10-18 19:00
Java 9 has been released on September 21 officially, Eclipse is supporting Java 9 from Eclipse Oxygen.1a (4.7.1a), Lets jump into module world..!!! Download Java 9 from here, and add i… Read More
2017-10-18 16:00
You obviously know what lazy loading is, right? And you no doubt know about caching. To my knowledge, there is no elegant way in Java to implement either of them. Here is what I found out fo… Read More
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