diff --git a/application/src/test/java/org/thingsboard/mqtt/broker/AbstractPubSubIntegrationTest.java b/application/src/test/java/org/thingsboard/mqtt/broker/AbstractPubSubIntegrationTest.java
index ae2522b3c..bee87833d 100644
--- a/application/src/test/java/org/thingsboard/mqtt/broker/AbstractPubSubIntegrationTest.java
+++ b/application/src/test/java/org/thingsboard/mqtt/broker/AbstractPubSubIntegrationTest.java
@@ -131,12 +131,10 @@ protected void after() {
     public static class ReplaceKafkaPropertiesBeanPostProcessor implements BeanPostProcessor {
         @Override
         public Object postProcessAfterInitialization(@NotNull Object bean, @NotNull String beanName) throws BeansException {
-            if (bean instanceof TbKafkaConsumerSettings) {
-                TbKafkaConsumerSettings kafkaSettings = (TbKafkaConsumerSettings) bean;
+            if (bean instanceof TbKafkaConsumerSettings kafkaSettings) {
                 kafkaSettings.setServers(kafka.getBootstrapServers());
             }
-            if (bean instanceof TbKafkaProducerSettings) {
-                TbKafkaProducerSettings kafkaSettings = (TbKafkaProducerSettings) bean;
+            if (bean instanceof TbKafkaProducerSettings kafkaSettings) {
                 kafkaSettings.setServers(kafka.getBootstrapServers());
             }
             if (bean instanceof TbKafkaAdminSettings kafkaAdminSettings) {
diff --git a/application/src/test/java/org/thingsboard/mqtt/broker/service/integration/IntegrationTestInitService.java b/application/src/test/java/org/thingsboard/mqtt/broker/service/integration/IntegrationTestInitService.java
index f86e30bc2..66157a2bd 100644
--- a/application/src/test/java/org/thingsboard/mqtt/broker/service/integration/IntegrationTestInitService.java
+++ b/application/src/test/java/org/thingsboard/mqtt/broker/service/integration/IntegrationTestInitService.java
@@ -15,6 +15,8 @@
  */
 package org.thingsboard.mqtt.broker.service.integration;
 
+import jakarta.annotation.PostConstruct;
+import jakarta.annotation.PreDestroy;
 import net.jodah.concurrentunit.Waiter;
 import org.springframework.stereotype.Service;
 
@@ -26,15 +28,28 @@
 
 @Service
 public class IntegrationTestInitService {
+
     public static final int SUBSCRIBERS_COUNT = 10;
     public static final int PUBLISHERS_COUNT = 5;
     public static final int PUBLISH_MSGS_COUNT = 100;
 
+    private ExecutorService executor;
+
+    @PostConstruct
+    public void init() {
+        executor = Executors.newFixedThreadPool(PUBLISHERS_COUNT);
+    }
+
+    @PreDestroy
+    public void shutdown() {
+        executor.shutdownNow();
+    }
+
     public void initPubSubTest(BiConsumer<Waiter, Integer> subscriberInitializer,
                                BiConsumer<Waiter, Integer> publisherInitializer) throws Throwable {
         Waiter subscribersWaiter = new Waiter();
         CountDownLatch connectingSubscribers = new CountDownLatch(SUBSCRIBERS_COUNT);
-        ExecutorService executor = Executors.newFixedThreadPool(PUBLISHERS_COUNT);
+        executor = Executors.newFixedThreadPool(PUBLISHERS_COUNT);
         for (int i = 0; i < SUBSCRIBERS_COUNT; i++) {
             int finalI = i;
             executor.execute(() -> {
diff --git a/application/src/test/java/org/thingsboard/mqtt/broker/service/subscription/SubscriptionTriePerformanceTest.java b/application/src/test/java/org/thingsboard/mqtt/broker/service/subscription/SubscriptionTriePerformanceTest.java
index 88129e17a..d9d9b9082 100644
--- a/application/src/test/java/org/thingsboard/mqtt/broker/service/subscription/SubscriptionTriePerformanceTest.java
+++ b/application/src/test/java/org/thingsboard/mqtt/broker/service/subscription/SubscriptionTriePerformanceTest.java
@@ -43,12 +43,12 @@
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicLong;
 import java.util.function.Supplier;
-import java.util.stream.Collectors;
 import java.util.stream.IntStream;
 
 @Slf4j
 @RunWith(MockitoJUnitRunner.class)
 public class SubscriptionTriePerformanceTest {
+
     private static final String SERVICE_ID = "serviceId";
 
     private static final int FIRST_LEVEL_SEGMENTS = 50;
@@ -85,8 +85,7 @@ public void testSingleThread() throws Exception {
         List<Supplier<String>> levelSuppliers = initializeLevelSuppliers();
 
         List<String> topicFilters = initializeTopicFilters(levelSuppliers);
-        List<String> topics = topicFilters.stream().map(s -> s.replaceAll("[+#]", "test")).collect(Collectors.toList());
-
+        List<String> topics = topicFilters.stream().map(s -> s.replaceAll("[+#]", "test")).toList();
 
         fillSubscriptionTrie(topicFilters);
 
@@ -105,7 +104,7 @@ public void testSingleThread() throws Exception {
         task.get(30, TimeUnit.SECONDS);
         long endTime = System.currentTimeMillis();
         System.out.println("All took " + (endTime - startTime) + " ms");
-
+        executor.shutdownNow();
     }
 
     @Test
@@ -113,15 +112,13 @@ public void testMultipleThreads() throws Exception {
         List<Supplier<String>> levelSuppliers = initializeLevelSuppliers();
 
         List<String> topicFilters = initializeTopicFilters(levelSuppliers);
-        List<String> topics = topicFilters.stream().map(s -> s.replaceAll("[+#]", "test")).collect(Collectors.toList());
+        List<String> topics = topicFilters.stream().map(s -> s.replaceAll("[+#]", "test")).toList();
 
         fillSubscriptionTrie(topicFilters);
 
         ExecutorService subscribeExecutor = Executors.newSingleThreadExecutor();
         CountDownLatch processingPublishers = new CountDownLatch(NUMBER_OF_THREADS);
-        subscribeExecutor.execute(() -> {
-            simulateSubscribers(topicFilters, processingPublishers);
-        });
+        subscribeExecutor.execute(() -> simulateSubscribers(topicFilters, processingPublishers));
         long startTime = System.currentTimeMillis();
 
         ExecutorService executor = Executors.newFixedThreadPool(NUMBER_OF_THREADS);
@@ -142,6 +139,8 @@ public void testMultipleThreads() throws Exception {
         long endTime = System.currentTimeMillis();
         System.out.println("All took " + (endTime - startTime) + " ms");
 
+        subscribeExecutor.shutdownNow();
+        executor.shutdownNow();
     }
 
     private void simulateSubscribers(List<String> topicFilters, CountDownLatch processingPublishers) {
@@ -215,10 +214,10 @@ private List<Supplier<String>> initializeLevelSuppliers() {
         List<Supplier<String>> levelSuppliers = new ArrayList<>(MAX_LEVELS);
         List<String> firstLevelSegments = IntStream.range(0, FIRST_LEVEL_SEGMENTS).boxed()
                 .map(ignored -> UUID.randomUUID().toString().substring(0, 10))
-                .collect(Collectors.toList());
+                .toList();
         List<String> secondLevelSegments = IntStream.range(0, SECOND_LEVEL_SEGMENTS).boxed()
                 .map(ignored -> UUID.randomUUID().toString().substring(0, 10))
-                .collect(Collectors.toList());
+                .toList();
         levelSuppliers.add(() -> firstLevelSegments.get(r.nextInt(firstLevelSegments.size())));
         levelSuppliers.add(() -> secondLevelSegments.get(r.nextInt(secondLevelSegments.size())));
         for (int i = 0; i < MAX_LEVELS; i++) {