Removed version check from main as it is checked in the download function. Having the check here was breaking "latest version" functionality.

lib/ansible/modules/extras/packaging/maven_artifact.py

@@ -349,8 +349,7 @@ def main():
 
     prev_state = "absent"
     if os.path.isdir(dest):
-        dest = dest + "/" + artifact_id + "-" + version + ".jar"
+        dest = dest + "/" + artifact_id + "-" + version + "." + extension
-            
     if os.path.lexists(dest):
         prev_state = "present"
     else: