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Editorial Team
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Asked: 2026-06-15T20:32:46+00:00

I’m getting an unexpected version of a dependency (1.5.8) when I use the assembly

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I’m getting an unexpected version of a dependency (1.5.8) when I use the assembly plugin, but nowhere else. In my pom I have:

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.6.0</version>
    </dependency>

When I run dependency:tree or dependency:list, I see the correct version and only the correct version. When I check in Eclipse I see only the correct version.

In my assembly.xml I have:

<dependencySets>
    <dependencySet>
        <outputDirectory>lib</outputDirectory>
    </dependencySet>
</dependencySets>

In the resulting zip, I get slf4j-log4j12-1.5.8.jar. No idea where this is coming from. Any help?

Using maven 3.0.4.

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1 Answer

  1. Editorial Team

    This was due to a ‘bad’ assembly plugin version (2.2-beta-5). My pom.xml did not specify the plugin version. When I explicitly marked it as 2.4 (or the latest version when you read this!), the plugin pulled the correct dependency.

    Lesson learned – If you get the following warning in your build:

    [WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-whatever-plugin is missing
It is highly recommended to fix these problems because they threaten the stability of your build.

    .. fix it!

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