CQRS With Axon Tutorial: Part 2 – Modify the pom.xml(Add Axon Dependencies)

In Part 1, we set up the gcdemo project in IntelliJ.

In this part, we would modify the pom.xml by doing the following:

1. Add Necessary Plugin
2. Add Axon Dependency
3. Complete pom.xml file

1. Add Necessary Plugin

Since  our project has a mix of Kotlin and Java, we need to add the neccesary plugin to make it work.

Step 1: Copy the code below and paste in the <plugins></plugins> section of your pom.xml.

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.5.1</version>
            <executions>
                <!-- Replacing default-compile as it is treated specially by maven -->
                <execution>
                    <id>default-compile</id>
                    <phase>none</phase>
                </execution>
                <!-- Replacing default-testCompile as it is treated specially by maven -->
                <execution>
                    <id>default-testCompile</id>
                    <phase>none</phase>
                </execution>
                <execution>
                    <id>java-compile</id>
                    <phase>compile</phase>
                    <goals> <goal>compile</goal> </goals>
                </execution>
                <execution>
                    <id>java-test-compile</id>
                    <phase>test-compile</phase>
                    <goals> <goal>testCompile</goal> </goals>
                </execution>
            </executions>
        </plugin>

2. Add AxonFramework Dependency

To add AxonFramework dependency, you need to first add the axon.version to the <properties></properties> section of the pom.xml.

Step 1: Add axon.version 4.2. So the properties section would be as shown below:

Step 2: Change the vaadin version to 8.4.1 as that is what is used for this demo

<properties>
   <java.version>1.8</java.version>
   <kotlin.version>1.3.50</kotlin.version>
   <vaadin.version>8.4.1</vaadin.version>
   <axon.version>4.2</axon.version>
</properties>

Step 3: Add the following Axon dependency

<dependency>
   <groupId>org.axonframework</groupId>
   <artifactId>axon-spring-boot-starter</artifactId>
   <version>${axon.version}</version>
</dependency>

3. Complete pom.xml file

You can find below the complete pom.xml file. Just in case, you have errors, you can cross-check

<?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 https://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>
		<version>2.2.1.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.kindsonthegenius.gcdemo</groupId>
	<artifactId>gcdemo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>gcdemo</name>
	<description>Demo project for Axon</description>

	<properties>
		<java.version>1.8</java.version>
		<kotlin.version>1.3.50</kotlin.version>
		<vaadin.version>8.4.1</vaadin.version>
		<axon.version>4.2</axon.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<dependency>
			<groupId>org.axonframework</groupId>
			<artifactId>axon-spring-boot-starter</artifactId>
			<version>${axon.version}</version>
		</dependency>
		<dependency>
			<groupId>com.vaadin</groupId>
			<artifactId>vaadin-spring-boot-starter</artifactId>
		</dependency>
		<dependency>
			<groupId>org.jetbrains.kotlin</groupId>
			<artifactId>kotlin-reflect</artifactId>
		</dependency>
		<dependency>
			<groupId>org.jetbrains.kotlin</groupId>
			<artifactId>kotlin-stdlib-jdk8</artifactId>
		</dependency>

		<dependency>
			<groupId>com.h2database</groupId>
			<artifactId>h2</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
			<exclusions>
				<exclusion>
					<groupId>org.junit.vintage</groupId>
					<artifactId>junit-vintage-engine</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
	</dependencies>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>com.vaadin</groupId>
				<artifactId>vaadin-bom</artifactId>
				<version>${vaadin.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<build>
		<sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
		<testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
			<plugin>
				<groupId>org.jetbrains.kotlin</groupId>
				<artifactId>kotlin-maven-plugin</artifactId>
				<configuration>
					<args>
						<arg>-Xjsr305=strict</arg>
					</args>
					<compilerPlugins>
						<plugin>spring</plugin>
						<plugin>jpa</plugin>
					</compilerPlugins>
				</configuration>
				<dependencies>
					<dependency>
						<groupId>org.jetbrains.kotlin</groupId>
						<artifactId>kotlin-maven-allopen</artifactId>
						<version>${kotlin.version}</version>
					</dependency>
					<dependency>
						<groupId>org.jetbrains.kotlin</groupId>
						<artifactId>kotlin-maven-noarg</artifactId>
						<version>${kotlin.version}</version>
					</dependency>
				</dependencies>
			</plugin>

			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.5.1</version>
				<executions>
					<!-- Replacing default-compile as it is treated specially by maven -->
					<execution>
						<id>default-compile</id>
						<phase>none</phase>
					</execution>
					<!-- Replacing default-testCompile as it is treated specially by maven -->
					<execution>
						<id>default-testCompile</id>
						<phase>none</phase>
					</execution>
					<execution>
						<id>java-compile</id>
						<phase>compile</phase>
						<goals> <goal>compile</goal> </goals>
					</execution>
					<execution>
						<id>java-test-compile</id>
						<phase>test-compile</phase>
						<goals> <goal>testCompile</goal> </goals>
					</execution>
				</executions>
			</plugin>

		</plugins>
	</build>

</project>