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I'm trying to create a uber jar from spring boot multi module project. Example provided https://spring.io/guides/gs/multi-module/

I've two modules:

  <modules>
    <module>library</module>
    <module>application</module>
</modules>

If I run "mvn clean install spring-boot:repackage" from "application" I see that application-0.0.1-SNAPSHOT.war gets created. But once I open that war by 7-zip, I see there's nothing for the "Library" module under the WEB-INF folder. And apprantely, the generated war file doesn't work; 'cause it doesn't have any reference classes from "Library" Here's is the parent pom:

   <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>multiModule</groupId>
  <artifactId>parent-multi-module</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>pom</packaging>
  <modules>
    <module>library</module>
    <module>application</module>
</modules>
<properties>
    <start-class>bismillah.application.DemoApplication</start-class>
</properties>
<repositories>
    <repository>
        <id>spring-releases</id>
        <url>https://repo.spring.io/libs-release</url>
    </repository>
</repositories>
<pluginRepositories>
    <pluginRepository>
        <id>spring-releases</id>
        <url>https://repo.spring.io/libs-release</url>
    </pluginRepository>
</pluginRepositories>

</project>

And finally the pom from "library" module:

    <?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>2.1.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>bismillah</groupId>
    <artifactId>library</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>library</name>
    <description>Demo project for Spring Boot</description>

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

    <dependencies>

        <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>

</project>

And finally the pm from "application" module:

<?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>2.1.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>bismillah</groupId>
    <artifactId>application</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>application</name>
    <packaging>war</packaging>
    <description>Demo project for Spring Boot</description>

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

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>bismillah</groupId>
            <artifactId>library</artifactId>
            <version>${project.version}</version>
        </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>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                      <goals>
                        <goal>repackage</goal>
                      </goals>
                    </execution>
                  </executions>
            </plugin>
        </plugins>
    </build>
</project>

As you can see that I've used "repackage" goal from "spring-boot-maven-plugin"; but still not working. Not sure what am I doing wrong... Can you please help.

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  • Possible duplicate of Building a fat jar using maven, if not let know, we'll try to figure it out Commented Nov 18, 2019 at 3:43
  • @Hasan Could you try executing the command 'mvn clean install' only and not inlcude the repackage goal in the command as it is already specified in the pom while building the provject ? Commented Nov 18, 2019 at 5:26
  • similar issue: stackoverflow.com/questions/70833195/… Commented Jan 24, 2022 at 13:21

1 Answer 1

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Try adding the library module as a dependency of the application module pom in the section

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