Maven pom.xml inheriting dependencies from spring-boot-starter-parent is not working

Question

I have created a Spring boot application for learning purpose.

I had my configurations in default application.properties file.

src/main/resources/application.properties

server.port=8761

This was working fine.

Later I decided to change configurations to application.yml file

src/main/resources/application.yml

server:
 port: 1112

From Spring documentation:

Create a file called application.yml and stick it in the root of your classpath, and also add snakeyaml to your dependencies (Maven coordinates org.yaml:snakeyaml, already included if you use the spring-boot-starter).

My pom.xml is inheriting from parent spring-boot-starter as below.

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

Since parent pom.xml has org.yaml:snakeyaml depedencies, I have not included any dependency in pom and tried running application.

But now values from application.yml file is not taken in account, instead application is using default port.

When I added the snakeyaml dependency explicitly in pom.xml, application.yml values are considered.

Also I dont think parent pom is missing the dependency, because when I added snakeyaml explicitly I am getting below warning in eclipse

Overriding managed version 1.17 for snakeyaml

Can anyone help me on this issue?

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.example</groupId>
    <artifactId>ServiceDiscovery</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

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

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
            <scope>test</scope>
        </dependency>
            <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.5</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>1.6.4</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.yaml/snakeyaml -->
<dependency>
    <groupId>org.yaml</groupId>
    <artifactId>snakeyaml</artifactId>
    <version>1.19</version>
</dependency>

    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Camden.SR5</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

The parent did not define any dependency only dependencyManagement. So when not defining any dependency in your project you did not even have the Annotation @SpringBootApplication. So you need at least spring-boot-starter as dependency which will activate auto config and yaml. — mszalbach
It’s included by spring-boot-starter), not spring-boot-starter-parent. Which starter are you depending on in your Pom? — Erwin Bolwidt
Dependencies looks OK. Could you add your Java Class which starts the eureka server and show your Java classes package structure? Maybe a look at this sample project helps (there is a eureka module): github.com/mszalbach/cloudbook. — mszalbach
First why are you adding slf4j api and simple in two different versions..Spring boot contains already everything for logging..so no need for that...just remove those deps. Furthermore spring boot contains also correct versions for reading yml files so no need to add snakyaml...dependency...explicit...so remove that too... — khmarbaise

Essex Boy Essex Boy · Accepted Answer · 2017-11-17T12:32:47

My org.yaml:snakeyaml comes from spring-boot-starter-web (mvn dependency:tree command)

[INFO] +- org.springframework.boot:spring-boot-starter-web:jar:1.5.1.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter:jar:1.5.1.RELEASE:compile
[INFO] |  |  +- org.springframework.boot:spring-boot:jar:1.5.1.RELEASE:compile
[INFO] |  |  +- org.springframework.boot:spring-boot-autoconfigure:jar:1.5.1.RELEASE:compile
[INFO] |  |  +- org.springframework.boot:spring-boot-starter-logging:jar:1.5.1.RELEASE:compile
[INFO] |  |  |  +- ch.qos.logback:logback-classic:jar:1.1.9:compile
[INFO] |  |  |  |  \- ch.qos.logback:logback-core:jar:1.1.9:compile
[INFO] |  |  |  +- org.slf4j:jul-to-slf4j:jar:1.7.22:compile
[INFO] |  |  |  \- org.slf4j:log4j-over-slf4j:jar:1.7.22:compile
[INFO] |  |  \- org.yaml:snakeyaml:jar:1.17:runtime

here is the dependency

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <version>1.5.1.RELEASE</version>
</dependency>

Presumably it is in other spring-boot-starter modules that include spring-boot-starter.

You do not need the

<dependency>
    <groupId>org.yaml</groupId>
    <artifactId>snakeyaml</artifactId>
    <version>1.19</version>
</dependency>

Maven pom.xml inheriting dependencies from spring-boot-starter-parent is not working

1 Answers