Switch Expression Groovy has always had much more powerful switch statements compared to Java. Class case values, regular expression case values, collection case values, closure case values, or at th...

In a previous post we learned about the macros SV, SVI and SVD that return a string representation of variables with their name and value. Groovy 4 also added the NP and NPL macros that we can use to ...

Groovy 4 added some built-in macros that we can use in our code. A macro is code that will create new code. It does this by manipulating the Abstract Syntax Tree (AST) before the code is compiled. So ...

Ever looked for a comprehensive tutorial for Gradle that is fun and entertaining at the same time? In this video tutorial below, you'll learn how to use Gradle like a professional. Cover topics i...

Groovy supports ranges for a long time. But Groovy 4 adds a new feature for ranges and that is the support for open (exclusive) ranges at the beginning of a range. Open means the number that defines t...

Groovy 4 introduced support for TOML configuration file. In a previous post we already learned how we can parse TOML content. In this post we will see we can use a builder syntax to create TOML conten...

Since Groovy 4 we can parse TOML configuration data into a Map. Once the TOML data is transformed into the Map we can use all possibilities in Groovy to lookup keys and their values in maps. For examp...

In a previous (old) post we learned how Groovy supports different classifiers for a switch case statement. Since Groovy 4 we can use switch also as an expression. This means the switch statement retur...

To check if a value is of a certain type in DataWeave we must use the is operator. We must specify the type after the is operator and the value before the is operator. For example to check if the valu...

Grails scaffolding works great out of the box.  Today I want to see how we can improve adding data to the many side of a one-to-many relationship using jQuery, jQueryUI's Dialog, and some Ajax. &...

There should always be something new to learn everyday. Otherwise, life is boring. In software development, it is even more boring if we don't explore to learn anything new.Maven is popular open sourc...

Ever looked for a comprehensive intro to JUnit 5 that is fun and entertaining at the same time? Then have a look at this brand-new episode of the "Marco Codes" YouTube channel: JUnit 5 Tutorial - Nice...

When Maven is the build tool and you have no choice, you need to factor in additional amount of development time dealing with its build file: the pom.xml. Any new additional feature eats up unexpected...

Moving to the cloud with event-driven architecture raises big concerns for enterprises using multiple programming languages such as Java, C#, JavaScript, Scala, and Groovy to implement business requir...

The dw::core::Arrays module has some nice functions that works with arrays. One of these functions is countBy. The function takes an array as first argument and a predicate function that accepts an it...

DataWeave has several function to find the highest or lowest value in an array. The items in the array need to be of the same type and implement the Comparable interface. To find the highest value we ...

This article is a follow-up to my previous post, Deploy Maven Apps to Kubernetes With JKube Kubernetes Maven Plugin. Eclipse JKube is a collection of tools and libraries which ease a Java developer's ...

Apache Log4j is the popular open source logging library for Java developers that was recently caught up in a massive security-related breach. Due to its popularity, a large number of organizations wer...

Observability is a must-have nowadays in modern cloud services. There are multiple levels and options to provide observability into a service. Logging is the basic one but is well used can perform... ...

Testing classes that work with date calculations based on the current date and time (now) can be difficult. First of all we must make sure our class under test accepts a java.time.Clock instance. This...

I was joyfully coding in Groovy for several years. Back to Java two years ago, and have not been writing any production code in Groovy, still writing my own productive non-production utilities in...

Micronaut is a state-of-the-art micro web framework targeting the Java Virtual Machine (JVM). I quite like that you can implement your web application oder service using either Java, Groovy or Kotlin ...

In addition to developing, building & deploying modern Java applications is also a developers' concern. Build tools come with a promise to save developers' time. But often times they suck develope...

Java developers are usually required to take many actions before we can begin developing and deploying cloud-native microservices on Kubernetes. First, we have to configure everything from the integra...

In the video below, we take a closer look at the How to import the Gradle spring boot Application in eclipse? | Spring Boot tutorial. Let's get started!

In the video below, we take a closer look at the How to install Gradle in the windows operating system? | Gradle tutorial. Let's get started!

In the video below, we take a closer look at how to bootstrap a Spring Boot application with some help from Gradle. Let's get started!

If we want to get two types of information from a Stream of objects we can consume the Stream twice and collect the results. But that is not very efficient, especially when the stream has a lot of obj...

If we need to create a Java properties file in our build we could create a custom task and use the Properties class to store a file with properties. Instead of writing our custom task we can use the t...

Introduction In my previous article, Creating Filters With GServlet, we learned how to create filters with the GServlet API for an elegant implementation with the Groovy language. In this one, we are ...

When working on a Java project, we might want to have a place where we can just play around with the code we write. We need a "scratch" file where we can access the Java classes we write in our main s...

Java introduced preview features in the language since Java 12. This features can be tried out by developers, but are still subject to change and can even be removed in a next release. By default the ...

Over the course of my career, a problem that I have had to face fairly repeatedly is dealing with a nested tree-like structure with arbitrary depth. From XML to directory structures to building data m...

In my first article "Getting Started with GServlet", we created a simple Hello World Servlet using the Groovy language. Today, we are going to see how simple it is to create filters with the GServlet ...

In Java we can merge a key/value pair into a Map with the merge method. The first parameter is the key, the second the value and the third parameter of the merge method is a remapping function that is...

In Clojure we can use the merge function to merge multiple maps into a single map. If a key is in multiple maps the value of the key merged last will be used in the resulting map. If we want to influe...

The plugins section in our Gradle build files can be used to define Gradle plugins we want to use. Gradle can optimize the build process if we use plugins {...} in our build scripts, so it is a good i...

When we have a multi-module project in Gradle we sometimes want to have dependencies, task configuration and other settings shared between the multiple modules. We can use the subprojects or allprojec...

GServlet is an open-source project inspired by Groovlets, which aims to use the Groovy language and its provided modules to simplify Servlet API web development. Groovlets are Groovy scripts exec...

The best way to protect your Java code from avoidable bugs is to use static code analysis tools that can help you find and fix problematic code before it reaches production. Let's look at some popular...

In this tutorial, we will build a TreeMap diagram using the MindFusion diagramming library for Java and using IntelliJ as the development IDE. I. General Setup With Gradle and Maven We create a new Gr...

Sometimes we want to invoke Java methods from our Clojure code. If the Java method accepts a variable arguments (varargs) parameter and we want to invoke the method from Clojure we must pass an array ...

Roughly 12 years ago, I started to contribute to the Eclipse ecosystem in various functions. One of the most interesting experiences to this date was to work on developer tooling and handling the edge...

<p>In our <a href="https://recursive.codes/p/message-driven-microservices-monol iths-with-micronaut-part-1:-installing-kafka-sending-your-first-messag e">last post</a>, w...

I've been migrating all my JavaFX applications to Java 15/JavaFX 15.0.1 to see if there are any pain points or gotchas to be aware of. I particularly wanted to understand how Maven and Gradle handl...