Clik here to view.
Lookahead and Lookbehind in Java Regex
1. Overview Sometimes we might face difficulty matching a string with a regular expression. For example, we might not know what we want to match exactly, but we can be aware of its surroundings, like...
View ArticleClik here to view.
Difference Between Maven Surefire and Failsafe Plugins
1. Overview In typical Test Driven Development, we aim to write lots of low-level unit tests that are fast to run and set up in isolation. Additionally, there are also few high-level integration tests...
View ArticleClik here to view.
Kubernetes Deployment vs. StatefulSets
1. Overview Kubernetes (K8s) is an open-source container orchestration system. It allows us to automate deployments, scale, and manage containerized applications. In this tutorial, we'll discuss two...
View ArticleClik here to view.
Swagger @Api Description Is Deprecated
1. Overview Describing a RESTful API plays an important role in the documentation. One common tool used to document REST APIs is Swagger 2. However, one useful attribute used for adding a description...
View ArticleClik here to view.
JPA Entities and the Serializable Interface
1. Introduction In this tutorial, we'll discuss how JPA entities and the Java Serializable interface blend. First, we'll take a look at the java.io.Serializable interface and why we need it. After...
View ArticleClik here to view.
Different Serialization Approaches for Java
1. Overview Serialization is the process of converting an object into a stream of bytes. That object can then be saved to a database or transferred over a network. The opposite operation, extracting an...
View ArticleClik here to view.
“Code too large” Compilation Error in Java
1. Overview When a Java method exceeds 65535 bytes, we get the compilation error, “code too large”. In this article, we'll discuss why this error occurs and how to fix it. 2. JVM Constraints The...
View ArticleClik here to view.
Converting Camel Case and Title Case to Words in Java
1. Overview Strings commonly contain a mixture of words and other delimiters. Sometimes, these strings may delimit words by a change in case without whitespace. For example, camel case capitalizes each...
View ArticleClik here to view.
Start Two Threads at the Exact Same Time in Java
1. Overview Multi-thread programming allows us to run threads concurrently, and each thread can handle different tasks. Thus, it makes optimal use of the resources, particularly when our computer has a...
View ArticleClik here to view.
Send Large Messages With Kafka
1. Overview Apache Kafka is a powerful, open-source, distributed, fault-tolerant event streaming platform. However, when we use Kafka to send messages larger than the configured size limit, it gives an...
View ArticleClik here to view.
The java.lang.NoClassDefFoundError in JUnit
1. Overview In this article, we'll understand why the java.lang.NoClassDefFoundError occurs in JUnit and how to fix it. This issue is mainly related to IDE's configurations. Therefore, we'll be...
View ArticleClik here to view.
Count Occurrences Using Java groupingBy Collector
1. Overview In this short tutorial, we'll see how we can group equal objects and count their occurrences in Java. We'll use the groupingBy() collector in Java. 2. Count Occurrences using...
View ArticleClik here to view.
Java Weekly, Issue 393
1. Spring and Java >> Quarkus 2.0.0.Final released [quarkus.io] Lots of new and exciting features in Quarkus 2.0 – continuous testing, brand new CLI, more Kotlin friendly, more extensions, and so...
View ArticleClik here to view.
Find the GC Algorithm Used by a JVM Instance
1. Overview In addition to typical development utilities such as compiler and runtime, each JDK release is shipped with a myriad of other tools. Some of these tools can help us to gain valuable...
View ArticleClik here to view.
List Active Brokers in a Kafka Cluster Using Shell Commands
1. Overview Monitoring an event-driven system that uses the Apache Kafka cluster would often require us to get the list of active brokers. In this tutorial, we'll explore few shell commands to get the...
View ArticleClik here to view.
Converting String to BigInteger in Java
1. Overview In this tutorial, we'll demonstrate how we can convert a String to a BigInteger. The BigInteger is commonly used for working with very large numerical values, which are usually the result...
View ArticleClik here to view.
Tiered Compilation in JVM
1. Overview The JVM interprets and executes bytecode at runtime. In addition, it makes use of the just-in-time (JIT) compilation to boost performance. In earlier versions of Java, we had to manually...
View ArticleClik here to view.
Additional Source Directories in Maven
1. Overview In this tutorial, we'll explain how we can add multiple source directories in the Maven-based Java project. 2. Extra Source Directory Let's assume we need to add a /newsrc source directory...
View ArticleClik here to view.
Static Classes Versus the Singleton Pattern in Java
1. Introduction In this quick tutorial, we'll discuss some eminent differences between programming to the Singleton design pattern and using static classes in Java. We'll review both the coding...
View ArticleClik here to view.
Force Repository Update with Maven
1. Overview In this tutorial, we'll learn how to force-update a local Maven repository when it becomes corrupted. To accomplish this, we'll use a straightforward example to understand why a repository...
View Article