From d68d89d26e86b0fb69915dcdf09ae0243610b413 Mon Sep 17 00:00:00 2001
From: Igor Kulikov <ikulikov@thingsboard.io>
Date: Mon, 27 Apr 2026 20:04:33 +0300
Subject: [PATCH] fix(solutions): invert empty-check guard in deleteSolution

The guard around iterating createdEntityIds was checking isEmpty()
instead of !isEmpty(), so entity deletion was skipped whenever there
was actually data to clean up.
---
 .../server/service/solutions/DefaultSolutionService.java        | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/application/src/main/java/org/thingsboard/server/service/solutions/DefaultSolutionService.java b/application/src/main/java/org/thingsboard/server/service/solutions/DefaultSolutionService.java
index 85489e82fd..b68fe5515c 100644
--- a/application/src/main/java/org/thingsboard/server/service/solutions/DefaultSolutionService.java
+++ b/application/src/main/java/org/thingsboard/server/service/solutions/DefaultSolutionService.java
@@ -248,7 +248,7 @@ public class DefaultSolutionService implements SolutionService {
     @Override
     public void deleteSolution(TenantId tenantId, SolutionTemplateInstalledItemDescriptor descriptor, SecurityUser user) throws ThingsboardException {
         try {
-            if (descriptor.getCreatedEntityIds() != null && descriptor.getCreatedEntityIds().isEmpty()) {
+            if (descriptor.getCreatedEntityIds() != null && !descriptor.getCreatedEntityIds().isEmpty()) {
                 List<EntityId> entityIds = new ArrayList<>(descriptor.getCreatedEntityIds());
                 // Delete in the descending order of creation to avoid dependency issues.
                 Collections.reverse(entityIds);