user2325154 user2325154 - 10 months ago 121
Java Question

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

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>

Answer Source

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.

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