2 files changed, 18 insertions, 1 deletions
diff --git a/config/src/main/java/com/yahoo/config/subscription/impl/ConfigSubscription.java b/config/src/main/java/com/yahoo/config/subscription/impl/ConfigSubscription.java
index 6a81c2279d1..d1eab1e1ff1 100644
--- a/config/src/main/java/com/yahoo/config/subscription/impl/ConfigSubscription.java
+++ b/config/src/main/java/com/yahoo/config/subscription/impl/ConfigSubscription.java
@@ -203,6 +203,11 @@ public abstract class ConfigSubscription<T extends ConfigInstance> {
         this.config.set(new ConfigState<>(true, generation, applyOnRestart, true, config, payloadChecksums));
     }
 
+    void setConfigAndGeneration(Long generation, boolean applyOnRestart, T config, PayloadChecksums payloadChecksums) {
+        ConfigState<T> prev = this.config.get();
+        this.config.set(new ConfigState<>(true, generation, applyOnRestart, !config.equals(prev.getConfig()), config, payloadChecksums));
+    }
+
     /**
      * Used by {@link FileConfigSubscription} and {@link ConfigSetSubscription}
      */
diff --git a/config/src/main/java/com/yahoo/config/subscription/impl/JRTConfigSubscription.java b/config/src/main/java/com/yahoo/config/subscription/impl/JRTConfigSubscription.java
index 27099790f5b..c6ea79ddbcd 100644
--- a/config/src/main/java/com/yahoo/config/subscription/impl/JRTConfigSubscription.java
+++ b/config/src/main/java/com/yahoo/config/subscription/impl/JRTConfigSubscription.java
@@ -73,7 +73,7 @@ public class JRTConfigSubscription<T extends ConfigInstance> extends ConfigSubsc
             if (jrtReq.hasUpdatedConfig()) {
                 setNewConfig(jrtReq);
             } else {
-                setGeneration(jrtReq.getNewGeneration());
+                setNewConfigAndGeneration(jrtReq);
             }
         }
 
@@ -110,6 +110,18 @@ public class JRTConfigSubscription<T extends ConfigInstance> extends ConfigSubsc
         }
     }
 
+    protected void setNewConfigAndGeneration(JRTClientConfigRequest jrtReq) {
+        try {
+            T configInstance = toConfigInstance(jrtReq);
+            setConfigAndGeneration(jrtReq.getNewGeneration(),
+                                   jrtReq.responseIsApplyOnRestart(),
+                                   configInstance,
+                                   jrtReq.getNewChecksums());
+        } catch (IllegalArgumentException e) {
+            throw new IllegalArgumentException("Bad config in response", e);
+        }
+    }
+
     /**
      * This method should ideally throw new MissingConfig/Configuration exceptions and let the caller
      * catch them. However, this would make the code in JRT/File/RawSource uglier.