Wrap DataCommunicator#getBackEndSorting in an unmodifiable list

1 files changed, 3 insertions, 2 deletions

diff --git a/server/src/main/java/com/vaadin/data/provider/DataCommunicator.java b/server/src/main/java/com/vaadin/data/provider/DataCommunicator.java
index 88974715cd..7a662e2aac 100644
--- a/server/src/main/java/com/vaadin/data/provider/DataCommunicator.java
+++ b/server/src/main/java/com/vaadin/data/provider/DataCommunicator.java
@@ -18,6 +18,7 @@ package com.vaadin.data.provider;
 import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashSet;
 import java.util.LinkedHashSet;
@@ -547,11 +548,11 @@ public class DataCommunicator<T> extends AbstractExtension {
     /**
      * Returns the {@link QuerySortOrder} to use with backend sorting.
      *
-     * @return list of sort order information to pass to a query
+     * @return an unmodifiable list of sort order information to pass to a query
      * @since 8.0.6
      */
     public List<QuerySortOrder> getBackEndSorting() {
-        return backEndSorting;
+        return Collections.unmodifiableList(backEndSorting);
     }
 
     /**