From fd7f53bc9508d18bac36170241ebc20e48d14e99 Mon Sep 17 00:00:00 2001
From: Sergey Matvienko <smatvienko@thingsboard.io>
Date: Tue, 28 Feb 2023 21:47:51 +0100
Subject: [PATCH] RedisTbTransactionalCache fix - skip eviction of empty key
 list

---
 .../thingsboard/server/cache/RedisTbTransactionalCache.java   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/common/cache/src/main/java/org/thingsboard/server/cache/RedisTbTransactionalCache.java b/common/cache/src/main/java/org/thingsboard/server/cache/RedisTbTransactionalCache.java
index a9f262d6ca..c5af954392 100644
--- a/common/cache/src/main/java/org/thingsboard/server/cache/RedisTbTransactionalCache.java
+++ b/common/cache/src/main/java/org/thingsboard/server/cache/RedisTbTransactionalCache.java
@@ -108,6 +108,10 @@ public abstract class RedisTbTransactionalCache<K extends Serializable, V extend
 
     @Override
     public void evict(Collection<K> keys) {
+        //Redis expects at least 1 key to delete. Otherwise - ERR wrong number of arguments for 'del' command
+        if (keys.isEmpty()) {
+            return;
+        }
         try (var connection = connectionFactory.getConnection()) {
             connection.del(keys.stream().map(this::getRawKey).toArray(byte[][]::new));
         }