There is an empty 'build.resources.resource.directory' entry in the POM:
...
<resource>
<targetPath>jars</targetPath>
<directory></directory> <Unable to render embedded object: File (-- empty) not found.!! -->
<includes>
<include>clover-2.3.1.jar</include>
</includes>
</resource>
</resources>
...
Maven complains about it:
[WARNING] POM for 'com.cenqua.clover:clover:pom:2.3.1:provided' is invalid. It will be ignored for artifact resolution. Reason: Failed to validate POM for project com.cenqua.clover:clover at Artifact [com.cenqua.clover:clover:pom:2.3.1:provided]
[DEBUG] Reason: Failed to validate POM for project com.cenqua.clover:clover at Artifact [com.cenqua.clover:clover:pom:2.3.1:provided]
[DEBUG]
Validation Errors:
[DEBUG] 'build.resources.resource.directory' is missing.
Maybe a '.' value for the directory will work?
assigning to the 2.3.1 release