After JUnit 5 was released, a lot of developers just added this awesome new library to their projects, because unlike other versions, in this new version, it is not necessary to migrate from JUnit 4 to 5, you just need to include the new library in your project, and with all the engine of JUnit 5 you can do your new tests using JUnit 5, and the old...

In this post, we would like to share our real-world experience in optimizing a Java application that was controlling the robots in a warehouse. This application would give instructions to the robots in the warehouse on what actions to perform. Based on those instructions, robots carry out their job in the warehouse. Occasionally, this application w...

Parameterized tests allow developers to efficiently test their code with a range of input values. In the realm of JUnit testing, seasoned users have long grappled with the complexities of implementing these tests. But with the release of JUnit 5.7, a new era of test parameterization enters, offering developers first-class support and enhanced capab...

In Part 1 of this series, we looked at MongoDB, one of the most reliable and robust document-oriented NoSQL databases. Here in Part 2, we'll examine another quite unavoidable NoSQL database: Elasticsearch. More than just a popular and powerful open-source distributed NoSQL database, Elasticsearch is first of all a search and analytics engine. It is...

Effective exception management is pivotal for maintaining the integrity and stability of software applications. Java's lambda expressions offer a concise means of expressing anonymous functions, yet handling exceptions within these constructs presents unique challenges. In this article, we'll delve into the nuances of managing exceptions within Jav...

The enduring prevalence of COBOL (Common Business-Oriented Language) in mission-critical applications poses a challenge for modernization efforts, particularly in the transition to Java. This paper explores the intricacies of converting COBOL to Java, emphasizing the avoidance of JOBOLa term coined for Java code that retains procedural characterist...

Over the past few years, Apache Kafka has emerged as the leading standard for streaming data. Fast-forward to the present day: Kafka has achieved ubiquity, being adopted by at least 80% of the Fortune 100. This widespread adoption is attributed to Kafka's architecture, which goes far beyond basic messaging. Kafka's architecture versatility makes it...

Debugging effectively requires a nuanced approach, similar to using tongs that tightly grip the problem from both sides. While low-level tools have their place in system-level service debugging, today's focus shifts towards a more sophisticated segment of the development stack: advanced management tools. Understanding these tools is crucial for dev...

Thread dump analysis is a traditional approach followed to analyze the performance bottlenecks in Java-based applications. In the modern era, we have APM tools that provide various metrics and screens to drill down and identify performance issues, even at the code level. But for some of the performance issues or occasions, thread dump analysis stil...

Spring Boot is a highly popular framework for Java enterprise applications. One common method of integration with internal or external applications is through HTTP REST connections. We were upgrading from RestTemplate to the Java NIO-based WebClient, which can significantly enhance application performance by allowing concurrency when calling REST s...

Ever wondered what happens behind the scenes when you hit that "run" button on your Java program? The process involves a series of complex steps, from compiling and loading the code into memory to managing data in data structures like the heap and stack. Here, we'll explore the steps of running a basic Java program, highlighting the roles of the lo...

Java 17 heralds a new era in Java's evolution, bringing forth the Foreign Function and Memory API as part of its feature set. This API, a cornerstone of Project Panama, is designed to revolutionize the way Java applications interact with native code and memory. Its introduction is a response to the long-standing complexities and inefficiencies asso...

Imagine entering a bustling workshop - not of whirring machines, but of minds collaborating. This is the true essence of software programming at its core: a collective effort where code serves not just as instructions for machines, but as a shared language among developers. However, unlike spoken languages, code can often become an obscure dialect,...

This is the perfect time to raise this point just as Spring Native is coming to the forefront. Is it time to move to GraalVM? Spoiler: it depends. Yes, if youre building serverless, probably no if youre building pretty much anything else with a few exceptions for some microservices. Before I begin, I want to qualify that Im talking about native i...

Today, I'd like to share with you the application of Camunda BPM in Java development. In this article, Ill talk about the key components of the Camunda Business Process Management system. Also, Ill show the system's deployment, modeling, and deployment of a simple process. Let's first understand the terminology and find out what BPM, BPMS, and BPMN...

Unlike PHP or JavaScript, Java is a strongly typed programming language. It essentially means that each variable must be declared with a pre-defined data type that can not be changed afterwards. There are two data types in Java: Primitive data types - int, double, float, byte, long, boolean, etc. Reference data types - Integer, Double, Float, ...

Recently we encountered a production in an application. This application was connecting to multiple systems of records (SOR). Oracle RAC cluster is one of the primary systems of record. This Oracle RAC cluster was slowing down due to resource constraints. This slowdown in the Oracle RAC cluster degraded the entire applications response time. In thi...

This article uses a story format to show the concept of records in Java. It shows the different concepts and parts that make up the records, including a restricted identifier, java.lang.Record, Components, Canonical, Compact, Normal constructors, and more. The Minimalist A Resolution Working from home has taught some of us to think of being ...

In our day-to-day work, we develop applications that include interactions with software components through I/O. They can be a database, a broker, or some form of blob storage. Take, for example, the cloud components you interact with: Azure Storage Queue, SQS, Pub/Sub. The communication with those components usually happens with an SDK. From the st...

I met with Georges Saab, Senior Vice President, Java Platform Group, Oracle Chair, OpenJDK Governing Board following his keynote at JavaOne. This was the first JavaOne conference since 2017 and was held in conjunction with Oracle Cloud World. Java has been around for 27 years. It continues to be an important language for enterprises and developers....

I had a pretty awful travel experience trying to reach Oslo, but its all worth it for what is possibly my favorite conference: JavaZone. I absolutely love this conference. It has everything: Sense of humor, craziness, heavy metal, continuous integration of food and amazing talks with great people. This years conference has a fantasy theme which fit...

The JVM does great stuff to let our Java applications run the fastest way possible. Most of the time, you don't have to care about the internals, but if you really need to get the best performance, you need to take into account how JVM works. It's not the goal of this article to give a detailed introduction to this topic but merely to show how our ...

While developing an application, we need to make some processing more robust and less fault-tolerant, especially when requesting remote services that may remain down for a long duration. In this article, we will introduce a new framework that aims to provide a declarative non-blocking retry support for methods in Spring-based applications using ann...

This is the second article in my series dedicated to the Querydsl framework. I planned to shed light on the custom queries, as promised in the first article, but I decided to explain the metamodel usage first in order to simplify the explanation later on. So far, this series contains these articles:

This article looks at a benchmark passing events over TCP/IP at 4 billion events per minute using the net.openhft.chronicle.wire.channel package in Chronicle Wire (open source) and why we aim to avoid object allocations. One of the key optimizations is creating almost no garbage. Allocation is supposed to be a very cheap operation, and garbage col...

The Evolution of Java Over the past several years, the Java ecosystem landscape has evolved from monolith Java EE applications running on application servers and the Spring Framework to modern smaller-footprint Spring Boot, MicroProfile, and Jakarta EE microservices. Today, more Java developers are looking at how they can bring their existing Java ...

Originally written by Fernando Ipar and Martin Arrieta This is the third post in our MySQL Fabric series. If you missed the previous two, we started with an overall introduction, and then a discussion of MySQL Fabrics high-availability (HA) features. MySQL Fabric was RC when we started this series, but it went GA recently. You can read the press re...

A few weeks ago I wrote a blog on synchronizing multithreaded integration tests, which was republished on DZone Javalobby from where it received a comment from Robert Saulnier who quite rightly pointed out that you can also use join() to synchronize a worker thread and its unit tests. This got me thinking, just how many ways can you synchronise mul...

In my last post, I described a new feature in TokuMX 1.5partitioned collectionsthats aimed at making it easier and faster to work with time series data. Feedback from that post made me realize that some users may not immediately understand the differences between partitioning a collection and sharding a collection. In this post, I hope to clear tha...

Part 1 In the previous post we looked at techniques to help us create and articulate more effective queries. From auto-complete for lookup tasks to auto-suggest for exploratory search, these simple techniques can often make the difference between success and failure. But occasionally things do go wrong. Sometimes our information journey is more co...

In this tutorial, we will discuss transaction management in Java using examples. But before moving to transaction management, we should know what a transaction is. Therefore, the following are some important points about transactions for better understanding: A transaction is a segment of program execution that accesses and can alter different pi...

JSON (JavaScript Object Notation) is a commonly used semi-structured data type. With the self-describing schema structure, JSON can hold all data types, including multi-level nested data types, such as Array, Object, etc. JSON takes advantage of high flexibility and easy dynamic expansion compared with the structured data types that must strictly f...

JVM Memory has the following regions: Young Generation Old Generation Metaspace Others region