How to move all the common dependencies from maven module into parent module in spring boot

Question

I have two simple

Spring Boot

applications, one is a

eureka-server

and another is an

eureka-client

. Both of them reside in a maven aggregator module

eureka-sample

.

I have some common dependencies in both the

eureka-server

and

eureka-client

applications that I would like to move up to the parent pom so that I do not have to include them in each of the child modules every now and then.

I tried moving the dependency

spring-boot-starter-test

from the child modules into the parent pom under

<dependencyManagement>

section but then the tests in the child module were not able to compile as those classes were not able to find the

jar

. May be I misconfigured or placed it under wrong section.

How can I achieve this?

eureka-sample (parent 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>

    <groupId>com.study.spring</groupId>

    <artifactId>eureka-sample</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <packaging>pom</packaging>

    <name>eureka-sample</name>



    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <java.version>1.8</java.version>

        <spring-cloud.version>Dalston.SR4</spring-cloud.version>

    </properties>



    <modules>

        <module>eureka-server</module>

        <module>eureka-client</module>

    </modules>



    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>1.5.8.RELEASE</version>

        <relativePath />

    </parent>



    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.springframework.cloud</groupId>

                <artifactId>spring-cloud-dependencies</artifactId>

                <version>${spring-cloud.version}</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>



    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

                <configuration>

                    <fork>true</fork>

                </configuration>

            </plugin>

        </plugins>

    </build>



</project>

eureka-server/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>

    <artifactId>eureka-server</artifactId>

    <packaging>jar</packaging>

    <name>eureka-server</name>

    <description>Demo project for Spring Boot</description>

    <parent>

        <groupId>com.study.spring</groupId>

        <artifactId>eureka-sample</artifactId>

        <version>0.0.1-SNAPSHOT</version>

    </parent>

    <dependencies>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-eureka-server</artifactId>

        </dependency>



        **<!-- ALL THE FOLLOWING 3 DEPENDENCIES SHOULD GO TO PARENT POM SO THAT I DO NOT HAVE TO PUT THEM IN EVERY CHILD MODULE -->**

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-devtools</artifactId>

            <optional>true</optional>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

            <optional>true</optional>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>

</project>

eureka-client/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>

    <artifactId>eureka-client</artifactId>

    <packaging>jar</packaging>

    <name>eureka-client</name>

    <description>Demo project for Spring Boot</description>



    <parent>

        <groupId>com.study.spring</groupId>

        <artifactId>eureka-sample</artifactId>

        <version>0.0.1-SNAPSHOT</version>

    </parent>



    <dependencies>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-eureka</artifactId>

        </dependency>



        **<!-- ALL THE FOLLOWING 3 DEPENDENCIES SHOULD GO TO PARENT POM SO THAT I DO NOT HAVE TO PUT THEM IN EVERY CHILD MODULE -->**

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-devtools</artifactId>

            <optional>true</optional>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

            <optional>true</optional>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>



</project>

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Answer 1

Try putting the common dependencies inside the <dependencies> section of the parent .pom instead of the <dependencyManagement> section.

With <dependencyManagement> you only prepare and configure the dependencies for all children modules, but in order to actually use them, you'll still need to reference them from within the child module.

The difference is subtle, but important - see https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html for details.

How to move all the common dependencies from maven module into parent module in spring boot

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