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Posted to issues@maven.apache.org by "RalfNaujokat (via GitHub)" <gi...@apache.org> on 2026/02/15 08:38:26 UTC
[I] Maven 4 (rc5) creates effective pom with wrong header [maven]
RalfNaujokat opened a new issue, #11715:
URL: https://github.com/apache/maven/issues/11715
### Affected version
4.0.0-rc5
### Bug description
Hi all.
With a minimal POM
```
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.1.0"
xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 http://maven.apache.org/xsd/maven-4.1.0.xsd">
<modelVersion>4.1.0</modelVersion>
<groupId>tmp</groupId>
<artifactId>tmp</artifactId>
<version>tmp</version>
<packaging>pom</packaging>
</project>
```
i noticed, that `mvn help:effective-pom`
generates a pom with **4.0.0** schemaLocation
```
Effective POMs, after inheritance, interpolation, and profiles are applied:
<?xml version="1.0" encoding="UTF-8"?>
<!-- ====================================================================== -->
<!-- -->
<!-- Generated by Maven Help Plugin -->
<!-- See: https://maven.apache.org/plugins/maven-help-plugin/ -->
<!-- -->
<!-- ====================================================================== -->
<!-- ====================================================================== -->
<!-- -->
<!-- Effective POM for project 'tmp:tmp:pom:tmp' -->
<!-- -->
<!-- ====================================================================== -->
<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>4.1.0</modelVersion>
<groupId>tmp</groupId>
<artifactId>tmp</artifactId>
<version>tmp</version>
<packaging>pom</packaging>
...
```
I don't know what are the consequences, but i guess this should be corrected.
greetings
Ralf
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Re: [I] Maven 4 (rc5) creates effective pom with wrong header [maven]
Posted by "gnodet (via GitHub)" <gi...@apache.org>.
gnodet closed issue #11715: Maven 4 (rc5) creates effective pom with wrong <project> header
URL: https://github.com/apache/maven/issues/11715
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Re: [I] Maven 4 (rc5) creates effective pom with wrong header [maven]
Posted by "elharo (via GitHub)" <gi...@apache.org>.
elharo commented on issue #11715:
URL: https://github.com/apache/maven/issues/11715#issuecomment-3908123332
There's a deeper issue here. All the 4.0.0 namespaces are incorrect, and not just in these examples.. This should not have been changed from 3.x.
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Re: [I] Maven 4 (rc5) creates effective pom with wrong header [maven]
Posted by "RalfNaujokat (via GitHub)" <gi...@apache.org>.
RalfNaujokat commented on issue #11715:
URL: https://github.com/apache/maven/issues/11715#issuecomment-4698995444
So cool, that you guys found a solution for that issue.
It looks, like this was a quite hard one, all in all.
I' looking forward to the first maven 4 version.
Even an improved rc6 would help me a lot.
We (my team at work) really need some clrarification
about the next big thing. :-)
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Re: [I] Maven 4 (rc5) creates effective pom with wrong header [maven]
Posted by "achyuth8055 (via GitHub)" <gi...@apache.org>.
achyuth8055 commented on issue #11715:
URL: https://github.com/apache/maven/issues/11715#issuecomment-3904908569
Hi @RalfNaujokat , I would like to investigate and work on #11715 issue if it is not currently being handled. I will start by reproducing the issue and analysing how the effective model namespace and schema Location are generated.
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Re: [I] Maven 4 (rc5) creates effective pom with wrong header [maven]
Posted by "gnodet (via GitHub)" <gi...@apache.org>.
gnodet commented on issue #11715:
URL: https://github.com/apache/maven/issues/11715#issuecomment-4108450900
This issue is related to the broader namespace discussion in #10692 — whether Maven should use a single namespace (`http://maven.apache.org/POM/4.0.0`) across all model versions or use distinct namespaces per model version. The resolution of that debate will determine whether the current behavior is actually a bug or correct.
_Claude Code on behalf of Guillaume Nodet_
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