no Cobertura.xml generated.

[inkrement]

I copied the Cobertura-configuration code into my pom.xml and run mvn cobertura:cobertura. It seems to start cobertura, but no output file is generated:

...
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Library-Example 0.1-alpha-1
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] >>> cobertura-maven-plugin:2.6:cobertura (default-cli) @ Library-Example >>>
[INFO] 
[INFO] --- wro4j-maven-plugin:1.4.6:run (default) @ Library-Example ---
[INFO] Executing the mojo: 
...

[trautonen]

With this amount of information it's quite hard to tell what goes wrong. Could you at least add the full maven output to the issue and for debugging you could run the build with -X flag to see verbose information.