Pom.xml cannot find artifact from m2 local repository

Question

I have created two projects using Spring Initializr: message-spring-boot-starter and message-app.

With the command mvn clean install I builded the artifact of the project message-spring-boot-starter and it appeared in the local m2 repository "com.message-starter"

Pom.xml of message-spring-boot-starter:

    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.message-starter</groupId>
    <artifactId>message-spring-boot-starter</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>message-spring-boot-starter</name>
    <description>message-spring-boot-starter</description>
    <properties>
        <java.version>11</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
    </dependencies>

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

Pom.xml of message-app:

    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>message-app</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>message-app</name>
    <description>message-app</description>
    <properties>
        <java.version>11</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.message-starter</groupId>
            <artifactId>message-spring-boot-starter</artifactId>
        </dependency>
    </dependencies>

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

I end up with an error: Could not find artifact com.message-starter:message-spring-boot-starter:jar:unknown in central (https://repo.maven.apache.org/maven2)

I want to add message-spring-boot-starter to the dependency of message-app project but I get this error every time.

Please tell me what I'm doing wrong and how to fix it

Answer 1

You need a version tag for your dependency which specifies the version of the artifact you are trying to pull.

        <dependency>
            <groupId>com.message-starter</groupId>
            <artifactId>message-spring-boot-starter</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>