Your maven pom.xml is missing the license, like this:
<licenses>
<license>
<name>LGPL 2.1</name>
<url>http://www.gnu.org/licenses/lgpl-2.1.html</url>
<comments>See discussion at http://whatever.com/license for more details.</comments>
<distribution>repo</distribution>
</license>
</licenses>
Your maven pom.xml is missing the license, like this: