Topic

Java

A collection of 40 issues

Micronaut HTTP Client - Error Flow

We have seen Micronaut BlockingHttpClient in action and how to use exchange and retrieve methods to interact with an HTTP endpoint. What happens if your endpoint returns HTTP status code greater than or equal to 400 (they indicate that it's an error)? To explore this, let's

Effective Java with Groovy - Favour Internal Iterators

Let's start with the following code making use of the traditional for loop. List<String> languages = List.of("Java", "Groovy", "Kotlin"); // List.of() requires Java 9 or above for (int i = 0; i < languages.size(); i++) { System.out.println(

Gradle - running tests in Continuous Build

In a previous post, we saw Gradle's continuous build in action. If you use Test Driven Development at work, you will be running your tests after every code change. Let's leverage Gradle's continuous build so that you don't have to trigger the

Micronaut - Reloading using Gradle's Continuous Build

I have written about my thoughts on hot loading in general in this post. Micronaut from version 1.2 started supporting continuous build, but you had to manually add the configuration entries to your project. With the 2.0 version, Micronaut supports 'continuous build' out of the box.

Effective Java with Groovy - Are you implementing equals and hashCode correctly?

Consider the following Groovy code. class Product { String sku String description BigDecimal price } Now let's put the Product class into use as follows. Product book1 = new Product(sku: 'P101', description: 'Effective Java', price: 599.0) Product book2 = new Product(sku: 'P101', description:

Gradle - Continuous Build

Back in 2015, Gradle introduced this feature which they called 'continuous build'. Those days, I was exploring Ratpack, and it was the first toolkit/ framework to leverage the continuous build feature. The idea here is to rerun the tasks whenever there is a code change. Gradle will first

Micronaut HTTP Client - just the response body

In a previous post, we used io.micronaut.http.client.BlockingHttpClient to get response from an HTTP endpoint. We used the exchange method as follows. HttpResponse response = client.toBlocking().exchange("/greeting", String) If you are using Java instead of Groovy, you will pass "String.class" instead

Effective Java with Groovy - When float and double put you in trouble!

Let's start with a Java program! What do you think the following program would print? float price = 0.1f; float amount = 0f; for (int i = 0; i < 10; i++) { amount += price; } System.out.println("Total price: " + amount); Well, the developer indeed intended the amount to

Lambda Expressions Syntax - Java vs Kotlin

Both Java and Kotlin support lambda expressions. There are similarities in their syntax, though they are precisely not the same. Many of you may be using both languages at work. When you use multiple languages, the syntax of another language may peek in. In my example, after using Groovy for

Micronaut CLI - The JVM Version

A few weeks ago, when I was checking for the versions of a tool on SDKMAN CLI, I noticed the broadcast message that a Micronaut 2 is available. If you are not familiar with SDKMAN already, you may want to take a look at my post on SDKMAN I installed