Compiling the sample code in the Apache Shiro sample folder through Maven returned the following error:
[ERROR] Failed to execute goal org.codehaus.mojo:buildnumber-maven-plugin:1.0-beta-4:create (default) on project samples-quickstart: Cannot get the revision information from the scm repository :
Adding the following parameter
<revisionOnScmFailure>unversioned</revisionOnScmFailure>
to the section of the buildnumber-maven-plugin (line 395/396) in the root pom.xml file solves the problem.