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A Guide to the Axon Framework 1. Overview In this article, we’ll be looking at Axon and how it helps us implement applications with CQRS (Command Query Responsibility Segregation) and Event Sourcing in mind. During this guide both Axon Framework and Axon Server will be utilized. The former will contain… Continue Reading axon-cqrs-event-sourcing
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Custom HTTP Header with the HttpClient 1. Overview In this tutorial, we’ll look at how to set a custom header with the HttpClient. If you want to dig deeper and learn other cool things you can do with the HttpClient – head on over to the main HttpClient tutorial. Further… Continue Reading httpclient-custom-http-header
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Static Methods Behavior in Kotlin 1. Overview One way in which the Kotlin language differs from Java is that Kotlin doesn’t contain the static keyword that we’re familiar with. In this quick tutorial, we’ll see a few ways to achieve Java’s static method behavior in Kotlin. 2. Package-Level Functions Let’s… Continue Reading kotlin-static-methods
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Keep Track of Logged In Users with Spring Security 1. Overview In this quick tutorial, we’re going to show an example of how we can track the currently logged in users in an application using Spring Security. For this purpose, we’re going to keep track of a list of logged… Continue Reading spring-security-track-logged-in-users
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Using Couchbase in a Spring Application 1. Introduction In this follow-up to our introduction to Couchbase, we create a set of Spring services that can be used together to create a basic persistence layer for a Spring application without the use of Spring Data. 2. Cluster Service In order to… Continue Reading couchbase-sdk-spring
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Programmatic Configuration with Log4j 2 1. Introduction In this tutorial, we’ll take a look at different ways to programmatically configure Apache Log4j 2. 2. Initial Setup To start using Log4j 2, we merely need to include the log4j-core and log4j-slf4j-impl dependencies in our pom.xml: <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.11.0</version> </dependency> <dependency>… Continue Reading log4j2-programmatic-config
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Quick Intro to Spring Cloud Configuration 1. Overview Spring Cloud Config is Spring’s client/server approach for storing and serving distributed configurations across multiple applications and environments. This configuration store is ideally versioned under Git version control and can be modified at application runtime. While it fits very well in Spring… Continue Reading spring-cloud-configuration
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Spring Remoting with AMQP 1. Overview We saw in the previous installments of the series how we can leverage Spring Remoting and the related technologies to enable synchronous Remote Procedure Calls on top of an HTTP channel between a server and a client. In this article, we’ll explore Spring Remoting… Continue Reading spring-remoting-amqp
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The Mediator Pattern in Java 1. Overview In this article, we’ll have a look at the Mediator Pattern, one of the GoF behavioral patterns. We’ll describe its purpose and explain when we should use it. As usual, we’ll also provide a simple code example. 2. Mediator Pattern In object-oriented programming,… Continue Reading java-mediator-pattern
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Remove the First Element from a List 1. Overview In this super-quick tutorial, we’ll show how to remove the first element from a List. We’ll perform this operation for two common implementations of the List interface – ArrayList and LinkedList. 2. Creating a List Firstly, let’s populate our Lists: @Before public… Continue Reading java-remove-first-element-from-list
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