diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/ListCommand.java b/src/main/java/com/googlesource/gerrit/plugins/replication/ListCommand.java
index fa17dce..07978ab 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/ListCommand.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/ListCommand.java
@@ -72,7 +72,7 @@
   }
 
   private void addQueueDetails(JsonObject obj, String key, Collection<PushOne> values) {
-    if (values.size() > 0) {
+    if (!values.isEmpty()) {
       JsonArray list = new JsonArray();
       for (PushOne p : values) {
         list.add(new JsonPrimitive(p.toString()));
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/StartCommand.java b/src/main/java/com/googlesource/gerrit/plugins/replication/StartCommand.java
index 7115d5b..fa8b44c 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/StartCommand.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/StartCommand.java
@@ -55,7 +55,7 @@
 
   @Override
   protected void run() throws Failure {
-    if (all && projectPatterns.size() > 0) {
+    if (all && !projectPatterns.isEmpty()) {
       throw new UnloggedFailure(1, "error: cannot combine --all and PROJECT");
     }