This is a bug (I think) which I came across a couple of times, while building Axis2. To overcome this you have to follow 2 simple instructions ;). For the completeness of this blog post, I will direct you through he complete build process.
1. First checkout the source.
svn co http://svn.apache.org/repos/asf/webservices/axis2/trunk/java2. Build the project from the source. Do not skip the tests, when you do a fresh build.
mvn clean install
Now is the tricky part. If you are not getting build errors, then no problems at all :). If you start getting build errors related to plugins, then do the following to overcome it.
1. First build the axis2-aar-maven-plugin.
2. Then build the axis2-mar-maven-plugin.
3. Afterwards, build axis2. This should pretty much overcome the build error :).