HTTP methods: Idempotency and Safety

Idempotency and safety are properties of HTTP methods. The HTTP RFC defines these properties and tells us which HTTP methods…

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Validating code and architecture constraints with ArchUnit

Introduction ArchUnit is a library for checking Java code against a set of self defined code and architecture constraints. These…

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Creating an API Gateway with Zuul and Spring Boot

Introduction When working with micro services it is common to have unified access-point to your system (also called API Gateway).…

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Method parameter validation with Spring and JSR 303

Spring provides an easy way to validate method parameters using JSR 303 bean validation. In this post we will see…

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Collecting application metrics with Micrometer

What is Micrometer? Micrometer is a simple facade for collecting metrics inside Java applications in a vendor neutral way. You…

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Java EE MVC: Handling form validation

In this post we will have a look on form validation in Java EE MVC. Java EE MVC integrates with…

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Using Java Stream summary statistics

Streams of primitive types (IntStream, etc.) provide a summaryStatistics() method that can be used to get multiple statistical properties of…

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Templating with Rocker

In this post we will have a quick look at Rocker, a statically typed and fast Java 8 template engine.…

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Java EE 8 MVC: Global exception handling

In the previous previous posts we learned about various ways to access request information (e.g. query or path parameters) in…

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