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An Introduction to Java.util.Hashtable Class
1. Overview Hashtable is the oldest implementation of a hash table data structure in Java. The HashMap is the second implementation, which was introduced in JDK 1.2. Both classes provide similar...
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Kotlin and Javascript
1. Overview Kotlin is a next-generation programming language developed by JetBrains. It gains popularity with the Android development community as a replacement for Java. Another exciting feature of...
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Spring Data Annotations
1. Introduction Spring Data provides an abstraction over data storage technologies. Therefore, our business logic code can be much more independent of the underlying persistence implementation. Also,...
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Spring Data REST Events with @RepositoryEventHandler
1. Introduction While working with an entity, the REST exporter handles operations for creating, saving, and deleting events. We can use an ApplicationListener to listen to these events and execute a...
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Example of Downloading File in a Servlet
1. Overview A common feature of web applications is the ability to expose a file for download. In this tutorial, we’ll cover a simple example of creating a downloadable file and serving it from a Java...
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Java Weekly, Issue 231
Here we go… 1. Spring and Java >> From Java to Kotlin and Back [allegro.tech] A controversial but interesting read about one team’s story which migrated from Java 8 to Kotlin… and then to Java...
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Spring Boot Annotations
1. Overview Spring Boot made configuring Spring easier with its auto-configuration feature. In this quick tutorial, we’ll explore the annotations from the org.springframework.boot.autoconfigure and...
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Spring Web Annotations
1. Overview In this tutorial, we’ll explore Spring Web annotations from the org.springframework.web.bind.annotation package. 2. @RequestMapping Simply put, @RequestMapping marks request handler...
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Spring Scheduling Annotations
1. Overview When single-threaded execution isn’t enough, we can use annotations from the org.springframework.scheduling.annotation package. In this quick tutorial, we’re going to explore the Spring...
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A Guide to Spring Data Key Value
1. Introduction The Spring Data Key Value framework makes it easy to write Spring applications that use key-value stores. It minimizes redundant tasks and boilerplate code required for interacting...
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Processing JSON with Kotlin and Klaxson
1. Overview Klaxon is one of the open source libraries that we can use to parse JSON in Kotlin. In this tutorial, we’re going to look at its features. 2. Maven Dependency First, we’ll need to add the...
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Guide to the this Java Keyword
1. Introduction In this tutorial, we’ll take a look at the this Java keyword. In Java, this keyword is a reference to the current object whose method is being called. Let’s explore how and when we can...
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Guide to the super Java Keyword
1. Introduction In this quick tutorial, we’ll take a look at the super Java keyword. Simply put, we can use the super keyword to access the parent class. Let’s explore the applications of the core...
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Returning a JSON Response from a Servlet
1. Introduction In this quick tutorial, we’ll create a small web application and explore how to return a JSON response from a Servlet. 2. Maven For our web application, we’ll include javax.servlet-api...
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Spring Data Reactive Repositories with MongoDB
1. Introduction In this tutorial, we’re going to see how to configure and implement database operations using Reactive Programming through Spring Data Reactive Repositories with MongoDB. We’ll go over...
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Visitor Design Pattern in Java
1. Overview In this tutorial, we’ll introduce one of the behavioral GoF design patterns – the Visitor. First, we’ll explain its purpose and the problem it tries to solve. Next, we’ll have a look at...
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The Thread.join() Method in Java
1. Overview In this tutorial, we’ll discuss the different join() methods in the Thread class. We’ll go into the details of these methods and some example code. Like the wait() and notify() methods,...
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Method Parameter Reflection in Java
1. Overview Method Parameter Reflection support was added in Java 8. Simply put, it provides support for getting the names of parameters at runtime. In this quick tutorial, we’ll take a look at how to...
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Performance of Java Mapping Frameworks
1. Introduction Creating large Java applications composed of multiple layers require using multiple models such as persistence model, domain model or so-called DTOs. Using multiple models for...
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Spring – Injecting Collections
1. Introduction In this tutorial, we’re going to show how to inject Java collections using the Spring framework. Simply put, we’ll demonstrate examples with the List, Map, Set collection interfaces....
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