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Spring Cloud AWS – EC2 In the previous article, we’re focusing on S3; now we’ll focus on the Elastic Compute Cloud – commonly known as EC2. 1. EC2 Metadata Access The AWS EC2MetadataUtils class provides static methods to access instance metadata like AMI Id and instance type. With Spring Cloud… Continue Reading spring-cloud-aws-ec2
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REST Query Language Over Multiple Tables with Querydsl Web Support REST Spring 1. Overview In this tutorial, we’ll continue with the second part of Spring Data Querydsl Web Support. Here, we’ll focus on associated entities and how to create queries over HTTP. Following the same configuration used in part one, we’ll… Continue Reading rest-querydsl-multiple-tables
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Java EE Session Beans 1. Introduction Enterprise Session Beans can be broadly classified into: Stateless Session Beans Stateful Session Beans In this quick article, we are going to discuss these two main types of session beans. 2. Setup To use Enterprise Beans 3.2, make sure to add the latest version… Continue Reading ejb-session-beans
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MQTT Client in Java 1. Overview In this tutorial, we’ll see how we can add MQTT messaging in a Java project using the libraries provided by the Eclipse Paho project. 2. MQTT Primer MQTT (MQ Telemetry Transport) is a messaging protocol that was created to address the need for a simple… Continue Reading java-mqtt-client
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Logging Spring WebClient Calls 1. Overview In this tutorial, we are going to show how to customize Spring’s WebClient – a reactive HTTP client – to log requests and responses. 2. WebClient WebClient is a reactive and non-blocking interface for HTTP requests, based on Spring WebFlux. It has a functional,… Continue Reading spring-log-webclient-calls
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The StackOverflowError in Java 1. Overview StackOverflowError can be annoying for Java developers, as it’s one of the most common runtime errors we can encounter. In this article, we’ll see how this error can occur by looking at a variety of code examples as well as how we can deal… Continue Reading java-stack-overflow-error
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Evaluation of Methods References in Java 1. Overview Java 8 introduced the concept of method references. We often see them as similar to lambda expressions. However, method references and lambda expressions are not exactly the same thing. In this article, we’ll show why they are different and what are the… Continue Reading java-methods-references-eval
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Java Web Weekly, Issue 148 1. Spring and Java ===== >> HTTP headers forwarding in microservices [frankel.ch] >> Tracing Spring Integration Flow with Spring Cloud Sleuth [java-allandsundry.com] Doing a proper microservice implementation is tough – no two ways about it. There are certainly new challenges but also a new class… Continue Reading java-web-weekly-148
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Introduction to HikariCP 1. Overview In this introductory article, we’ll learn about the HikariCP JDBC connection pool project. This is a very lightweight (at roughly 130Kb) and lightning fast JDBC connection pooling framework developed by Brett Wooldridge around 2012. 2. Introduction There are several benchmark results available to compare the… Continue Reading hikaricp
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Spring Data JPA – Adding a Method in All Repositories 1. Overview Spring Data makes the process of working with entities a lot easier by merely defining repository interfaces. These come with a set of pre-defined methods and allow the possibility of adding custom methods in each interface. However, if… Continue Reading spring-data-jpa-method-in-all-repositories
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