Make Change.empty final

2 files changed, 2 insertions, 2 deletions

diff --git a/controller-server/src/main/java/com/yahoo/vespa/hosted/controller/Application.java b/controller-server/src/main/java/com/yahoo/vespa/hosted/controller/Application.java
index ff8d817ca52..d5ce613b98d 100644
--- a/controller-server/src/main/java/com/yahoo/vespa/hosted/controller/Application.java
+++ b/controller-server/src/main/java/com/yahoo/vespa/hosted/controller/Application.java
@@ -74,7 +74,7 @@ public class Application {
         Objects.requireNonNull(validationOverrides, "validationOverrides cannot be null");
         Objects.requireNonNull(deployments, "deployments cannot be null");
         Objects.requireNonNull(deploymentJobs, "deploymentJobs cannot be null");
-        Objects.requireNonNull(change, "deploying cannot be null");
+        Objects.requireNonNull(change, "change cannot be null");
         Objects.requireNonNull(metrics, "metrics cannot be null");
         Objects.requireNonNull(rotation, "rotation cannot be null");
         this.id = id;
diff --git a/controller-server/src/main/java/com/yahoo/vespa/hosted/controller/application/Change.java b/controller-server/src/main/java/com/yahoo/vespa/hosted/controller/application/Change.java
index 7c1049da587..13d66c8d083 100644
--- a/controller-server/src/main/java/com/yahoo/vespa/hosted/controller/application/Change.java
+++ b/controller-server/src/main/java/com/yahoo/vespa/hosted/controller/application/Change.java
@@ -20,7 +20,7 @@ import java.util.Optional;
  */
 public final class Change {
 
-    private static Change empty = new Change(Optional.empty(), Optional.empty());
+    private static final Change empty = new Change(Optional.empty(), Optional.empty());
 
     /** The platform version we are upgrading to, or empty if none */
     private final Optional<Version> platform;