Embedded on Micha Kops' Tech Notes

Embedded Kafka for Spring Boot Testing without using Docker

Wed, 25 May 2022 00:00:00 +0200

Sometimes it is nice to set up an embedded Kafka broker for testing without the need to have Docker installed (e.g. for using testcontainers-lib).

The following snippet shows, how to set up an embedded Kafka instance for testing for a Spring Boot project.

Setup

Using Maven, this is our Spring Boot project with dependencies needed:

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>(1)
        <version>2.6.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.hascode.tutorial</groupId>
    <artifactId>kafka-testing</artifactId>
    <version>1.0.0-SNAPSHOT</version>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>17</java.version>
        <maven.compiler.source>${java.version}</maven.compiler.source>
        <maven.compiler.target>${java.version}</maven.compiler.target>
        <kafka.version>3.1.0</kafka.version>(2)
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>(3)
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka-test</artifactId>(4)
            <scope>test</scope>
        </dependency>

        <dependency>(5)
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.platform</groupId>
            <artifactId>junit-platform-launcher</artifactId>
            <scope>test</scope>
        </dependency>
        [..]
</project>

Implementing, Testing and Running Procedures for Neo4j

Tue, 27 Feb 2018 00:00:00 +0100

A lot of features are already included in the Neo4j graph database system but sometimes we want to extends its capabilities and implement functions and procedures by ourselves that we may reuse.

In the following tutorial I will demonstrate how to implement a procedure for Neo4j, how to write and run tests using JUnit and an embedded graph database and last but not least how to setup Neo4j with Docker and our stored procedure installed in no time.

Task Scheduling in Java EE 6 on GlassFish using the Timer Service

Fri, 22 Jun 2012 00:00:00 +0200

Creating cronjobs or scheduled service executions is made really easy in Java EE 6. Scheduled tasks may be created in a programmatic style or simply by adding some annotations to an EJB.

In the following tutorial we’re creating some simple scheduled tasks and let them run on an embedded GlassFish instance using the Maven Embedded GlassFish plugin..

Java EE 6 Maven Project from Archetype

First of all we’re creating a new maven-ized project using one of the appropriate jee6 Maven archetypes

Java EE 6 Development using the Maven Embedded GlassFish Plugin

Tue, 20 Sep 2011 00:00:00 +0200

Today we’re going to take a look at the Maven Embedded GlassFish Plugin and how it allows us quick creation of GlassFish server instances in no time and Java EE 6 application deployment.

Figure 1. GlassFish + Maven

With a few lines of configuration in your Maven’s pom.xml we’ve got a running GlassFish instance and are able to redeploy our application fast by pressing enter in our console.

In the following tutorial we’re going to build a Java EE 6 Web Application with a stateless session bean and a web servlet and finally deploy – and redeploy the application using the Maven GlassFish Plugin.

Enterprise Java Bean EJB 3.1 Testing using Maven and embedded Glassfish

Sat, 01 Jan 2011 00:00:00 +0100

Are you playing around with the shiny new 3.1 EJB API?

Using Maven for your Java projects?

Need an easy way to write and execute tests for your EJBs that depends on an Java Application Server?

No problem using Maven Archetypes, the Maven EJB Plugin and the GlassFish embedded Application Container..

Prerequisites

For the following tutorial we’re going to need an installation of Maven and of course – the Java Development Kit!