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Java Weekly, Issue 252
Here we go… 1. Spring and Java >> 5 Things Beginners Need to Know Before Using JPA / Hibernate / EclipseLink [thoughts-on-java.org] A good primer for developers who are thinking about...
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Reading a CSV File into an Array
1. Overview Simply put, a CSV (Comma Separated Values) file contains organized information separated by a comma delimiter. In this tutorial, we’ll look into different ways to read a CSV file into an...
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Introduction to Scala
1. Introduction In this tutorial, we are going to look at Scala – one of the primary languages that run on the Java Virtual Machine. We’ll begin with the core language features such as values,...
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Initializing Arrays in Kotlin
1. Overview In this quick tutorial, we’ll look at how we can initialize an array in Kotlin. 2. arrayOf Library Method Kotlin has a built-in arrayOf method which converts the provided enumerated values...
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Get a Value by Key in a JSONArray
1. Overview JSON is a light-weight and language independent data-interchange format used for most client-server communications. JSONObject and JSONArray are the two common classes usually available in...
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Mapping of Data Objects in Kotlin
1. Intro When working with a legacy code base, using an external library or integrating against a framework, we regularly have use cases where we want to map between different objects or data...
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Dependency Injection for Kotlin with Injekt
1. Introduction Dependency Injection is a software development pattern where we separate object creation from the objects that are being created. We can use this to keep our main application code as...
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Microservices with Oracle Helidon
1. Overview Helidon is the new Java microservice framework that has been open sourced recently by Oracle. It was used internally in Oracle projects under the name J4C (Java for Cloud). In this...
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Guide to Sorting in Kotlin
1. Overview Kotlin builds on top of the Java Collection framework using extension methods. This dramatically improves usability and readability without the need of third-party dependencies such as...
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Arrays in Java: A Reference Guide
1. Introduction In this tutorial, we’ll deep dive into a core concept in the Java language – arrays. We’ll first see what’s an array, then how to use them; overall, we’ll cover how to: Get started...
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Lombok Builder with Custom Setter
1. Introduction Project Lombok is a popular Java library to help reduce the amount of boilerplate code a developer needs to write. In this tutorial, we’ll take a look at how Lombok’s @Builder...
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Merging java.util.Properties Objects
1. Introduction In this short tutorial, we’ll focus on how to merge two or more Java Properties objects into one. We’ll explore three solutions, firstly starting with an example using iteration. Next,...
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Using indexOf to Find All Occurrences of a Word in a String
1. Overview The chore of searching for a pattern of characters, or a word, in a larger text string is done in various fields. In bioinformatics, for example, we may need to find a DNA snippet in a...
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Spring Boot CRUD Application with Thymeleaf
1. Overview The implementation of DAO layers that provide CRUD functionality on JPA entities can be a repetitive, time-consuming task that we want to avoid in most cases. Luckily, Spring Boot makes it...
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Java Weekly, Issue 253
Here we go… 1. Spring and Java >> HTTP cache with Spring examples [dolszewski.com] A good write-up on optimizing applications via the HTTP response cache mechanism available for Spring...
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A Guide to EnumMap
1. Overview EnumMap is a Map implementation that exclusively takes Enum as its keys. In this tutorial, we’ll discuss its properties, common use cases and when we should use it. 2. Project Setup...
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Hibernate Field Naming with Spring Boot
1. Introduction In this brief tutorial, we’ll see how to use the Hibernate naming strategies in a Spring Boot application. 2. Maven Dependencies If we begin with a Maven-based Spring Boot application,...
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Understanding Memory Leaks in Java
1. Introduction One of the core benefits of Java is the automated memory management with the help of the built-in Garbage Collector (or GC for short). The GC implicitly takes care of allocating and...
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Rate Limiting in Spring Cloud Netflix Zuul
1. Introduction Spring Cloud Netflix Zuul is an open source gateway that wraps Netflix Zuul. It adds some specific features for Spring Boot applications. Unfortunately, rate limiting is not provided...
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Convert Between java.time.Instant and java.sql.Timestamp
1. Overview Both java.time.Instant and java.sql.Timestamp classes represent a point on the timeline in UTC. In other words, they represent the number of nanoseconds since the Java epoch. In this quick...
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