Failed to dynamically deploy this plugin (ecutest-1.6)

[Rafael Rezende]

We are developing a plugin with a dependency to TraceTronic ECU-TEST Plugin.

<dependency>
        <groupId>de.tracetronic.jenkins.plugins</groupId>
        <artifactId>ecutest</artifactId>
        <version>1.6</version>
</dependency>

When running the plugin with mvn hpi:run, the dependency is successfully downloaded and Jenkins start just fine, with both my plugin and the dependency installed. I can see the ecustest-1.6 in my .m2 folder.

However, when I start a new instance of Jenkins and install my plugin's .hpi manually, the deployment fails with the following message:

java.io.IOException: Failed to dynamically deploy this plugin
	at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1383)
	at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1161)
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:110)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: Failed to install ecotest plugin
	at hudson.PluginManager.dynamicLoad(PluginManager.java:487)
	at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1379)
	... 5 more
Caused by: java.io.IOException: Dependency ecutest (1.6) doesn't exist
	at hudson.PluginWrapper.resolvePluginDependencies(PluginWrapper.java:533)
	at hudson.PluginManager.dynamicLoad(PluginManager.java:477)
	... 6 more

We tried to start with a plugin from scratch (with mvn -U org.jenkins-ci.tools:maven-hpi-plugin:create) and simply adding the dependency. Again, no success.

Has anyone experienced this? Any ideas?