see bug 1109534 for background

affected: bouncycastle, ecj, jarjar, tomcat

might also be random variation not related to arch


example diff:
/usr/share/maven-metadata/jarjar.xml
@@ -8,12 +8,12 @@
       <ns0:path>/usr/share/java/jarjar.jar</ns0:path>
       <ns0:aliases>
         <ns0:alias>
-          <ns0:groupId>jarjar</ns0:groupId>
+          <ns0:groupId>com.tonicsystems</ns0:groupId>
           <ns0:artifactId>jarjar</ns0:artifactId>
           <ns0:extension>jar</ns0:extension>
         </ns0:alias>
         <ns0:alias>
-          <ns0:groupId>com.tonicsystems</ns0:groupId>
+          <ns0:groupId>jarjar</ns0:groupId>
           <ns0:artifactId>jarjar</ns0:artifactId>
           <ns0:extension>jar</ns0:extension>
         </ns0:alias>


Whatever produces these entries, 
should make sure that they are always produced in the same order (e.g. sort it)

Please re-assign if you know of someone who can do more about this.