exec-maven-plugin ignores my company-local repository from settings.xml

In my company we're using an artifactory which everybody has configured as a repository in their own ~.m2\repository\settings.xml file (and this works).

But for some reason the exec-maven-plugin ignores / dislikes this repository. In my exec plugin configuration I've got a dependency that is in the mentioned repository:

    <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>exec-maven-plugin</artifactId>
        <version>1.3.2</version>
        <executions>
            ...
        </executions>
        <dependencies>
            <dependency>
                <groupId>com.sencha.gxt</groupId>
                <artifactId>gxt-themebuilder</artifactId>
                <version>3.1.4</version>
            </dependency>
        </dependencies>
    </plugin>

and when I run the build, maven correctly resolves the dependency from the company repository but the exec plugin fails after trying to get the dependency from the global maven repositories (but not from the company repository):

» mvn clean install                                                                                                                                     
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building MyProject
[INFO] ------------------------------------------------------------------------
Downloading: http://maven.my-company-artifactory.nil:8081/artifactory/sencha-commercial-release/com/sencha/gxt/gxt-themebuilder/3.1.4/gxt-themebuilder-3.1.4.pom
Downloaded: http://maven.my-company-artifactory.nil:8081/artifactory/sencha-commercial-release/com/sencha/gxt/gxt-themebuilder/3.1.4/gxt-themebuilder-3.1.4.pom (11 KB at 11.4 KB/sec)
Downloading: http://maven.my-company-artifactory.nil:8081/artifactory/sencha-commercial-release/com/sencha/gxt/gxt-parent/3.1.4/gxt-parent-3.1.4.pom
Downloaded: http://maven.my-company-artifactory.nil:8081/artifactory/sencha-commercial-release/com/sencha/gxt/gxt-parent/3.1.4/gxt-parent-3.1.4.pom (15 KB at 45.1 KB/sec)
Downloading: http://maven.my-company-artifactory.nil:8081/artifactory/sencha-commercial-release/com/sencha/gxt/gxt/3.1.4/gxt-3.1.4.pom
Downloaded: http://maven.my-company-artifactory.nil:8081/artifactory/sencha-commercial-release/com/sencha/gxt/gxt/3.1.4/gxt-3.1.4.pom (7 KB at 29.6 KB/sec)
Downloading: http://maven.my-company-artifactory.nil:8081/artifactory/sencha-commercial-release/com/sencha/gxt/gxt-themebuilder/3.1.4/gxt-themebuilder-3.1.4.jar
Downloading: http://maven.my-company-artifactory.nil:8081/artifactory/sencha-commercial-release/com/sencha/gxt/gxt/3.1.4/gxt-3.1.4.jar
Downloaded: http://maven.my-company-artifactory.nil:8081/artifactory/sencha-commercial-release/com/sencha/gxt/gxt-themebuilder/3.1.4/gxt-themebuilder-3.1.4.jar (1719 KB at 766.7 KB/sec)
Downloaded: http://maven.my-company-artifactory.nil:8081/artifactory/sencha-commercial-release/com/sencha/gxt/gxt/3.1.4/gxt-3.1.4.jar (3706 KB at 852.4 KB/sec)
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ my-project ---
[INFO] Deleting C:\workspace\MyProject\target
[INFO]
[INFO] --- maven-download-plugin:1.1.0:wget (download-phantomjs) @ my-project ---
[INFO] Got from cache: C:\Users\machner\.m2\repository\.cache\maven-download-plugin\phantomjs-1.9.6-windows.zip
[INFO]
[INFO] --- exec-maven-plugin:1.3.2:java (generate-my-project-gen) @ my-project ---
Downloading: http://repo.maven.apache.org/maven2/com/sencha/gxt/gxt-themebuilder/3.1.4/gxt-themebuilder-3.1.4.jar
Downloading: http://repo.maven.apache.org/maven2/com/sencha/gxt/gxt/3.1.4/gxt-3.1.4.jar
Downloading: https://oss.sonatype.org/content/repositories/google-snapshots/com/sencha/gxt/gxt/3.1.4/gxt-3.1.4.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 13.770s
[INFO] Finished at: Wed Oct 26 16:44:23 CEST 2016
[INFO] Final Memory: 11M/241M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.3.2:java (generate-my-project-gen) on project my-project: Execution generate-my-project-gen of goal org.codehaus.mojo:exec-maven-plugin:1.3.2:java failed: Plugin org.codehaus.mojo:exec-maven-plugin:1.3.2 or one of its dependencies could not be resolved: The following artifacts could not be resolved: com.sencha.gxt:gxt-themebuilder:jar:3.1.4, com.sencha.gxt:gxt:jar:3.1.4: Could not find artifact com.sencha.gxt:gxt-themebuilder:jar:3.1.4 in central (http://repo.maven.apache.org/maven2) -> [Help 1]

When inside my local repository I delete the _remote.repositories files for my dependency as suggested here the build passes. So it appears as if the exec plugin for some reason 'disliked' the company repository.

Any help would be appreciated.
Thanks,
Piotr

Reproduce the failure with the shown exec-maven-plugin:java configuration and the company repository in settings.xml, comparing normal Maven resolution with the plugin's dependency resolution. Trace the plugin's repository handling and add or update a regression test if the repository-specific behavior is covered; done means the dependency resolves through the configured company repository without deleting _remote.repositories files.