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Using @Autowired in Abstract Classes 1. Introduction In this quick tutorial, we’ll explain how to use the @Autowired annotation in abstract classes. We’ll apply @Autowired to an abstract class, and focus on the important points which we should take into account. 2. Setter Injection We can use @Autowired on a setter… Continue Reading spring-autowired-abstract-class
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Spring Core Annotations 1. Overview We can leverage the capabilities of Spring DI engine using the annotations in the org.springframework.beans.factory.annotation and org.springframework.context.annotation packages. We often call these “Spring core annotations” and we’ll review them in this tutorial. 2. DI-Related Annotations ==== 2.1. @Autowired We can use the @Autowired to mark a dependency… Continue Reading spring-core-annotations
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XML-Based Injection in Spring 1. Introduction In this basic tutorial, we’ll learn how to do simple XML-based bean configuration with the Spring Framework. 2. Overview Let’s start by adding Spring’s library dependency in the pom.xml: <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.1.4.RELEASE</version> </dependency> The latest version of the Spring dependency can be found… Continue Reading spring-xml-injection
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Circular Dependencies in Spring 1. What Is a Circular Dependency? It happens when a bean A depends on another bean B, and the bean B depends on the bean A as well: Bean A → Bean B → Bean A Of course, we could have more beans implied: Bean A… Continue Reading circular-dependencies-in-spring
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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. 2. List with @Autowired Let’s create an example bean: public class CollectionsBean { @Autowired private List<String> nameList;… Continue Reading spring-injecting-collections
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Spring Autowiring of Generic Types 1. Overview In this tutorial, we’ll see how to inject Spring beans by generic parameters. 2. Autowiring Generics in Spring 3.2. Spring supports injection of generic types since version 3.2. Suppose we have an abstract class called Vehicle and a concrete sub-class of it called Car:… Continue Reading spring-autowire-generics
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Guide to Spring @Autowired 1. Overview Starting with Spring 2.5, the framework introduced a new style of Dependency Injection driven by @Autowired Annotations. This annotation allows Spring to resolve and inject collaborating beans into your bean. In this tutorial, we will look at how to enable autowiring, various ways to… Continue Reading spring-autowire
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How to use the Spring FactoryBean? 1. Overview There are two kinds of beans in the Spring bean container: ordinary beans and factory beans. Spring uses the former directly, whereas latter can produce objects themselves, which are managed by the framework. And, simply put, we can build a factory bean… Continue Reading spring-factorybean
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Constructor Injection in Spring with Lombok 1. Introduction Lombok is an extremely useful library overcoming boilerplate code. If you are not familiar with it yet, I highly recommend taking a look at the previous tutorial – Introduction to Project Lombok. In this article, we’ll demonstrate its usability when combined with… Continue Reading spring-injection-lombok
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@Lookup Annotation in Spring 1. Introduction In this quick tutorial, we’ll take a look at Spring’s method-level dependency injection support, via the @Lookup annotation. 2. Why @Lookup? A method annotated with @Lookup tells Spring to return an instance of the method’s return type when we invoke it. Essentially, Spring will… Continue Reading spring-lookup
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