使用 Maven 嵌套依赖项包含而不创建阴影 jar

Question

I have created two maven projects . Below are pom files of both projects;

1. core-library -

<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.demo</groupId>
    <artifactId>core-library</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>Core</name>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.reflections</groupId>
                <artifactId>reflections</artifactId>
                <version>0.9.12</version>
                <scope>compile</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.reflections</groupId>
            <artifactId>reflections</artifactId>
        </dependency>
    </dependencies>
</project>

2. utility-library -

<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.demo</groupId>
    <artifactId>utility-library</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>Utility</name>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.demo</groupId>
                <artifactId>core-library</artifactId>
                <version>0.0.1-SNAPSHOT</version>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>com.demo</groupId>
            <artifactId>core-library</artifactId>
        </dependency>
    </dependencies>
</project> 

Now the core-library have some external dependencies eg org.reflections:reflections etc. So my expectation is when I add core-library to the utility-library, these external dependencies should automatically get added to dependency tree of utility-library.

But in actual, these nested dependencies are not getting included in dependency tree of utility-library.

Below is the output when I run mvn dependency:tree on utility-library

 --- maven-dependency-plugin:2.8:tree (default-cli) @ utility-library ---
[INFO] com.demo:utility-library:jar:0.0.1-SNAPSHOT
[INFO] +- com.demo:core-library:jar:0.0.1-SNAPSHOT:compile
INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------

I tried solution from this stack overflow question, but the problem is not solved yet.

Can someone please help me with this?

PS - I have to achieve this nested dependency inclusion without creating a fat/shaded/uber jar as it increses the actual jar size and I also want to further use utility-library as a maven dependency in other project.

UPDATE: When I tried building utility-library with -X (enable debug logs) flag, I got following errors,

[WARNING] The POM for com.demo:core-library:jar:0.0.1-SNAPSHOT is invalid, transitive dependencies (if any) will not be available: 3 problems were encountered while building the effective model for com.demo:core-library:0.0.1-SNAPSHOT
[ERROR] Invalid packaging for parent POM com.demo:core-library:0.0.1-SNAPSHOT, must be "pom" but is "jar" @
[ERROR] Invalid packaging for parent POMcom.demo:core-library:0.0.1-SNAPSHOT, must be "pom" but is "jar" @
[FATAL] The parents form a cycle: com.demo:core-library:0.0.1-SNAPSHOT -> com.demo:core-library:0.0.1-SNAPSHOT @ 

Answer 1

Your POMs look correct.

reflections is a transitive dependency that should be drawn automatically by Maven.

If you cannot see it, have a look at mvn dependency:tree . It should be listed there.

Maybe your IDE is showing nonsense.