Fix admin settings validation

dao/src/main/java/org/thingsboard/server/dao/service/validator/AdminSettingsDataValidator.java

@@ -32,8 +32,8 @@ public class AdminSettingsDataValidator extends DataValidator<AdminSettings> {
 
     @Override
     protected void validateCreate(TenantId tenantId, AdminSettings adminSettings) {
-        AdminSettings existentAdminSettingsWithKey = adminSettingsService.findAdminSettingsByKey(tenantId, adminSettings.getKey());
+        AdminSettings existingSettings = adminSettingsService.findAdminSettingsByTenantIdAndKey(tenantId, adminSettings.getKey());
-        if (existentAdminSettingsWithKey != null) {
+        if (existingSettings != null) {
             throw new DataValidationException("Admin settings with such name already exists!");
         }
     }

dao/src/test/java/org/thingsboard/server/dao/service/BaseAdminSettingsServiceTest.java

@@ -21,10 +21,15 @@ import org.junit.Assert;
 import org.junit.Test;
 import org.junit.jupiter.api.Assertions;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.thingsboard.common.util.JacksonUtil;
 import org.thingsboard.server.common.data.AdminSettings;
+import org.thingsboard.server.common.data.id.TenantId;
 import org.thingsboard.server.dao.exception.DataValidationException;
 import org.thingsboard.server.dao.settings.AdminSettingsService;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
 public abstract class BaseAdminSettingsServiceTest extends AbstractServiceTest {
 
     @Autowired
@@ -77,4 +82,33 @@ public abstract class BaseAdminSettingsServiceTest extends AbstractServiceTest {
             adminSettingsService.saveAdminSettings(SYSTEM_TENANT_ID, adminSettings);
         });
     }
+
+    @Test
+    public void whenSavingAdminSettingsWithAlreadyExistingKey_thenReturnError() {
+        String key = "mySettings";
+        ObjectNode value = JacksonUtil.newObjectNode().put("test", "test");
+
+        AdminSettings systemSettings = new AdminSettings();
+        systemSettings.setTenantId(TenantId.SYS_TENANT_ID);
+        systemSettings.setKey(key);
+        systemSettings.setJsonValue(value);
+        adminSettingsService.saveAdminSettings(TenantId.SYS_TENANT_ID, systemSettings);
+
+        assertThatThrownBy(() -> {
+            adminSettingsService.saveAdminSettings(TenantId.SYS_TENANT_ID, systemSettings);
+        }).hasMessageContaining("already exists");
+
+        AdminSettings tenantSettings = new AdminSettings();
+        tenantSettings.setTenantId(tenantId);
+        tenantSettings.setKey(key);
+        tenantSettings.setJsonValue(value);
+        assertDoesNotThrow(() -> {
+            adminSettingsService.saveAdminSettings(tenantId, tenantSettings);
+        });
+
+        assertThatThrownBy(() -> {
+            adminSettingsService.saveAdminSettings(tenantId, tenantSettings);
+        }).hasMessageContaining("already exists");
+    }
+
 }