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Posted to issues@maven.apache.org by "khmarbaise (via GitHub)" <gi...@apache.org> on 2026/07/30 22:51:01 UTC
[I] BOM packaging expanding wrong / Flatten the content [maven]
khmarbaise opened a new issue, #12640:
URL: https://github.com/apache/maven/issues/12640
### Affected version
Maven 4.0.0-rc6
### Bug description
Reproducer Git Repo: https://github.com/khmarbaise/maven-bug-4.0.0-rc6-bom
The root pom of the project defines some parts in dependency management like this:
```xml
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.junit</groupId>
<artifactId>junit-bom</artifactId>
<version>${version.junit-bom}</version>
<scope>import</scope>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-bom</artifactId>
<version>3.27.7</version>
<scope>import</scope>
<type>pom</type>
</dependency>
</dependencies>
</dependencyManagement>
```
The intresting module `bom` which is of type packaging `bom` contains the following:
```xml
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.soebes.examples.maven4</groupId>
<artifactId>mod-1</artifactId>
</dependency>
<dependency>
<groupId>com.soebes.examples.maven4</groupId>
<artifactId>mod-2</artifactId>
</dependency>
</dependencies>
</dependencyManagement>
```
What I expect to have is the resulting BOM file contains only the resolved versions for the given modules in it...
```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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.soebes.examples.maven4</groupId>
<artifactId>bom</artifactId>
<version>1.0.0-1</version>
<packaging>pom</packaging>
<name>Maven 4 :: BOM :: MOD BOM</name>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.soebes.examples.maven4</groupId>
<artifactId>mod-1</artifactId>
<version>1.0.0-1</version>
</dependency>
<dependency>
<groupId>com.soebes.examples.maven4</groupId>
<artifactId>mod-2</artifactId>
<version>1.0.0-1</version>
</dependency>
</dependencies>
</dependencyManagement>
</project>
```
but what I get is:
```xml
<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>
<groupId>com.soebes.examples.maven4</groupId>
<artifactId>bom</artifactId>
<version>1.0.0-1</version>
<packaging>pom</packaging>
<name>Maven 4 :: BOM :: MOD BOM</name>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.soebes.examples.maven4</groupId>
<artifactId>mod-1</artifactId>
<version>1.0.0-1</version>
</dependency>
<dependency>
<groupId>com.soebes.examples.maven4</groupId>
<artifactId>mod-2</artifactId>
<version>1.0.0-1</version>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>6.1.1</version>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>6.1.1</version>
</dependency>
<dependency>
....
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>3.27.7</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-guava</artifactId>
<version>3.27.7</version>
</dependency>
```
The first two entries are the defined modules within the multiproject build which is fine, but parts which are following are not. They are by inheriting from the parent and flatten all dependencies which are from the dependencyManagement of the parent.
That gives me no control what exactly will be in the resulting BOM-file. Furthermore why is the BOM file (in this case junit-bom and assertj-bom) flattened and not kept as it in the resulting BOM?
If I want to have the `junit-bom` in my bom-module being put into.. I could add a reference like this:
```xml
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.soebes.examples.maven4</groupId>
<artifactId>mod-1</artifactId>
</dependency>
<dependency>
<groupId>com.soebes.examples.maven4</groupId>
<artifactId>mod-2</artifactId>
</dependency>
<dependency>
<groupId>org.junit</groupId>
<artifactId>junit-bom</artifactId>
<version>${version.junit-bom}</version>
<scope>import</scope>
<type>pom</type>
</dependency>
</dependencies>
</dependencyManagement>
```
But as before it will be flattened which is from my perspective not a good idea.
That would give the control of the resulting bom file.
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Re: [I] BOM packaging expanding wrong / Flatten the content [maven]
Posted by "gnodet (via GitHub)" <gi...@apache.org>.
gnodet closed issue #12640: BOM packaging expanding wrong / Flatten the content
URL: https://github.com/apache/maven/issues/12640
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