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Validations for Enum Types 1. Introduction In the tutorial Java Bean Validation Basics, we saw how we can apply javax validations using JSR 380 to various types. And in the tutorial Spring MVC Custom Validation, we saw how to create custom validations. In this next tutorial, we’ll focus on building validations for… Continue Reading javax-validations-enums
File System Mocking with Jimfs 1. Overview Typically, when testing components that make heavy use of I/O operations, our tests can suffer from several issues such as poor performance, platform dependency, and unexpected state. In this tutorial, we’ll take a look at how we can alleviate these problems using the… Continue Reading jimfs-file-system-mocking
Defensive Copies for Collections Using AutoValue 1. Overview Creating immutable value objects introduces a bit of unwanted boilerplate. Also, Java’s standard collections types have the potential to introduce mutability to value objects where this trait is undesirable. In this tutorial, we’ll demonstrate how to create defensive copies of collections when… Continue Reading autovalue-defensive-copies
The Java File Class 1. Overview In this tutorial, we’ll give an overview of the File class, which is part of the java.io API. The File class gives us the ability to work with files and directories on the file system. 2. Creating a File Object The File class has 4 public constructors. Depending on… Continue Reading java-io-file
How to Count Duplicate Elements in Arraylist 1. Overview In this short tutorial, we’ll look at some different ways to count the duplicated elements in an ArrayList. 2. Loop with Map.put() Our expected result would be a Map object, which contains all elements from the input list as keys and… Continue Reading java-count-duplicate-elements-arraylist
Methods in Java 1. Introduction In Java, methods are where we define the business logic of an application. They define the interactions among the data enclosed in an object. In this tutorial, we’ll go through the syntax of Java methods, the definition of the method signature, and how to call… Continue Reading java-methods
Categories in Groovy 1. Overview We may sometimes wonder if we can add a few additional handy methods to compiled Java or Groovy classes where we don’t have the ability to modify the source code. As it turns out, a Groovy category lets us do just that. Groovy is a… Continue Reading groovy-categories
FetchMode in Spring Data JPA 1. Introduction In this short tutorial, we’ll take a look at different FetchMode values we can use in the @org.hibernate.annotations.Fetch annotation. 2. Setting up the Example As an example, we’ll use the following Customer entity with just two properties – an id and a set… Continue Reading spring-data-jpa-fetchmode
== High-Bandwidth Consulting Engagement + I typically work with Java teams building web applications with the Spring framework. We’ll focus on architectural guidance, spikes and proof of concepts, adoption of new technologies, planning and estimating features, etc. Over time, I saw I can best help focused, agile teams bringing a… Continue Reading consulting-short
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Spring @ComponentScan – Filter Types 1. Overview In an earlier tutorial, we learned about the basics of Spring component scans. In this write-up, we’ll see the different types of filter options available with the @ComponentScan annotation. 2. @ComponentScan Filter By default, classes annotated with @Component, @Repository, @Service, @Controller are registered as… Continue Reading spring-componentscan-filter-type
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