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An Introduction to Grails 3 and GORM 1. Overview This is a quick intro to Grails 3 and GORM. We’re going to of course use Groovy and – implicitly – the framework also makes use of Hibernate for ORM, the Spring Framework for Dependency Injection, SiteMash for layout and themes,… Continue Reading grails-gorm-tutorial
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TransactionRequiredException Error 1. Overview In this tutorial, we’re going to examine the cause of the TransactionRequiredException error and how to solve it. 2. TransactionRequiredException This error typically occurs when we’re trying to perform a database operation that modifies the database without a transaction. For example, attempting to update a record… Continue Reading jpa-transaction-required-exception
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Property Testing Example With Vavr 1. Overview In this article, we’ll be looking at the concept of Property Testing and its implementation in the vavr-test library. The Property based testing (PBT) allows us to specify the high-level behavior of a program regarding invariants it should adhere to. 2. What Is… Continue Reading vavr-property-testing
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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, variables, methods, and control structures. Then, we’ll explore some advanced features such… Continue Reading scala-intro
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Netflix Archaius with Various Database Configurations Cloud Persistence Spring 1. Overview The Netflix Archaius offers libraries and functionality for connecting to many data sources. In this tutorial, we’ll learn how to get configurations: Using the JDBC API to connect to a database From configurations stored in a DynamoDB instance By… Continue Reading netflix-archaius-database-configurations
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Format ZonedDateTime to String 1. Overview In this quick tutorial, we’ll see how to convert a ZonedDateTime to a String. We’ll also look at how to parse a ZonedDateTime from a String. 2. Creating a ZonedDateTime First, we’ll start with a ZonedDateTime with a time zone of UTC. There are several… Continue Reading java-format-zoned-datetime-string
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Deploy a Spring Boot WAR into a Tomcat Server 1. Introduction Spring Boot is a convention over configuration framework that allows us to set up a production-ready setup of a Spring project, and Tomcat is one of the most popular Java Servlet Containers. By default, Spring Boot builds a standalone Java… Continue Reading spring-boot-war-tomcat-deploy
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Object Type Casting in Java 1. Overview The Java type system is made up of two kinds of types: primitives and references. We covered primitive conversions in this article, and we’ll focus on references casting here, to get a good understanding of how Java handles types. Further reading: The Basics… Continue Reading java-type-casting
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Spring Data Web Support 1. Overview Spring MVC and Spring Data each do a great job simplifying application development in their own right. But, what if we put them together? In this tutorial, we’ll take a look at Spring Data’s web support and how its resolvers can reduce boilerplate and make… Continue Reading spring-data-web-support
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How to use Kotlin Range Expressions 1. Introduction A range is a sequence of values defined by a start, an end, and a step. In this quick tutorial, we’ll have a look at how we can define and use ranges in Kotlin. 2. Using Kotlin Ranges In Kotlin, we can create… Continue Reading kotlin-ranges
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