diff --git a/src/main/java/com/gerritforge/gerrit/globalrefdb/validation/BatchRefUpdateValidator.java b/src/main/java/com/gerritforge/gerrit/globalrefdb/validation/BatchRefUpdateValidator.java
index 0fe5ad5..22aae61 100644
--- a/src/main/java/com/gerritforge/gerrit/globalrefdb/validation/BatchRefUpdateValidator.java
+++ b/src/main/java/com/gerritforge/gerrit/globalrefdb/validation/BatchRefUpdateValidator.java
@@ -150,7 +150,7 @@
               .collect(Collectors.joining(", "));
       Exception firstFailureException = refsFailures.get(0).exception;
 
-      logger.atSevere().withCause(firstFailureException).log(allFailuresMessage);
+      logger.atSevere().withCause(firstFailureException).log("%s", allFailuresMessage);
       throw new IOException(allFailuresMessage, firstFailureException);
     }
 
@@ -162,17 +162,15 @@
       } catch (Exception e) {
         List<ReceiveCommand> receiveCommands = batchRefUpdate.getCommands();
         logger.atWarning().withCause(e).log(
-            String.format(
-                "Batch ref-update failing because of failure during the global refdb update. Set all commands Result to LOCK_FAILURE [%d]",
-                receiveCommands.size()));
+            "Batch ref-update failing because of failure during the global refdb update. Set all commands Result to LOCK_FAILURE [%d]",
+            receiveCommands.size());
         rollback(delegateUpdateRollback, finalRefsToUpdate, receiveCommands);
       }
     } catch (OutOfSyncException e) {
       List<ReceiveCommand> receiveCommands = batchRefUpdate.getCommands();
       logger.atWarning().withCause(e).log(
-          String.format(
-              "Batch ref-update failing because node is out of sync with the shared ref-db. Set all commands Result to LOCK_FAILURE [%d]",
-              receiveCommands.size()));
+          "Batch ref-update failing because node is out of sync with the shared ref-db. Set all commands Result to LOCK_FAILURE [%d]",
+          receiveCommands.size());
       receiveCommands.forEach((command) -> command.setResult(ReceiveCommand.Result.LOCK_FAILURE));
     }
   }
diff --git a/src/main/java/com/gerritforge/gerrit/globalrefdb/validation/RefUpdateValidator.java b/src/main/java/com/gerritforge/gerrit/globalrefdb/validation/RefUpdateValidator.java
index e2a0bd3..3086c26 100644
--- a/src/main/java/com/gerritforge/gerrit/globalrefdb/validation/RefUpdateValidator.java
+++ b/src/main/java/com/gerritforge/gerrit/globalrefdb/validation/RefUpdateValidator.java
@@ -159,16 +159,15 @@
 
   private Boolean isRefToBeIgnored(String refName) {
     Boolean isRefToBeIgnored = ignoredRefs.contains(refName);
-    logger.atFine().log("Is project version update? " + isRefToBeIgnored);
+    logger.atFine().log("Is project version update? %s", isRefToBeIgnored);
     return isRefToBeIgnored;
   }
 
   private <T extends Throwable> void softFailBasedOnEnforcement(T e, EnforcePolicy policy)
       throws T {
     logger.atWarning().withCause(e).log(
-        String.format(
-            "Failure while running with policy enforcement %s. Error message: %s",
-            policy, e.getMessage()));
+        "Failure while running with policy enforcement %s. Error message: %s",
+        policy, e.getMessage());
     if (policy == EnforcePolicy.REQUIRED) {
       throw e;
     }
@@ -176,7 +175,7 @@
 
   protected Boolean isGlobalProject(String projectName) {
     Boolean isGlobalProject = projectsFilter.matches(projectName);
-    logger.atFine().log("Is global project? " + isGlobalProject);
+    logger.atFine().log("Is global project? %s", isGlobalProject);
     return isGlobalProject;
   }
 
@@ -199,14 +198,13 @@
           result = RefUpdate.Result.LOCK_FAILURE;
         }
         logger.atSevere().withCause(e).log(
-            String.format(
-                "Failed to update global refdb, the local refdb has been rolled back: %s",
-                e.getMessage()));
+            "Failed to update global refdb, the local refdb has been rolled back: %s",
+            e.getMessage());
       }
       return result;
     } catch (OutOfSyncException e) {
       logger.atWarning().withCause(e).log(
-          String.format("Local node is out of sync with ref-db: %s", e.getMessage()));
+          "Local node is out of sync with ref-db: %s", e.getMessage());
 
       return RefUpdate.Result.LOCK_FAILURE;
     }