enhance out of order message

2 files changed, 5 insertions, 4 deletions

diff --git a/nouveau/src/main/java/org/apache/couchdb/nouveau/core/Index.java b/nouveau/src/main/java/org/apache/couchdb/nouveau/core/Index.java
index 7d893a9e2..a08b17816 100644
--- a/nouveau/src/main/java/org/apache/couchdb/nouveau/core/Index.java
+++ b/nouveau/src/main/java/org/apache/couchdb/nouveau/core/Index.java
@@ -152,7 +152,7 @@ public abstract class Index implements Closeable {
     protected final void assertUpdateSeqIsLower(final long updateSeq) throws UpdatesOutOfOrderException {
         assert Thread.holdsLock(this);
         if (!(updateSeq > this.updateSeq)) {
-            throw new UpdatesOutOfOrderException();
+            throw new UpdatesOutOfOrderException(this.updateSeq, updateSeq);
         }
     }
 
diff --git a/nouveau/src/main/java/org/apache/couchdb/nouveau/core/UpdatesOutOfOrderException.java b/nouveau/src/main/java/org/apache/couchdb/nouveau/core/UpdatesOutOfOrderException.java
index 3b89f41d2..fe7c1b899 100644
--- a/nouveau/src/main/java/org/apache/couchdb/nouveau/core/UpdatesOutOfOrderException.java
+++ b/nouveau/src/main/java/org/apache/couchdb/nouveau/core/UpdatesOutOfOrderException.java
@@ -15,10 +15,11 @@ package org.apache.couchdb.nouveau.core;
 
 import java.io.IOException;
 
-public class UpdatesOutOfOrderException extends IOException {
+public final class UpdatesOutOfOrderException extends IOException {
 
-    public UpdatesOutOfOrderException() {
-        super("Updates applied in the wrong order");
+    public UpdatesOutOfOrderException(final long currentSeq, final long attemptedSeq) {
+        super(String.format("Updates applied in the wrong order (current seq: %d, attempted seq: %d)",
+            currentSeq, attemptedSeq));
     }
 
 }