a427b021_Rebuild_Status___FedoraProject__Issue
[Explanation] Prior to Java 7, unmappable characters in the source were treated as warnings. Java treats them as errors. [How to fix] To fix it, simply build, look at the error locations and patch to replace the unmappable characters with appropriate characters. [Issue] 
Invalid ASCII chars
Java7 Package Rebuild Status - FedoraProject
Issue