Also throws an exception if rename fails.

src/org/jitsi/impl/fileaccess/FailSafeTransactionImpl.java

@@ -203,6 +203,8 @@ private void failsafeCopy(String from, String to)
         out.close();
 
         // once done, rename the partial file to the final copy
-        ptoF.renameTo(toF);
+        if (!ptoF.renameTo(toF))
+            throw new IOException("Failed to rename " + ptoF.getName() + " to"
+                                  + toF.getName());
     }
 }