diff --git a/src/main/java/com/iot/modbus_rtcp/controller/ModbusTCPController.java b/src/main/java/com/iot/modbus_rtcp/controller/ModbusTCPController.java
index 65e8830..e8f2180 100644
--- a/src/main/java/com/iot/modbus_rtcp/controller/ModbusTCPController.java
+++ b/src/main/java/com/iot/modbus_rtcp/controller/ModbusTCPController.java
@@ -24,7 +24,7 @@ import java.util.Set;
 @RestController
 @RequestMapping("modbus-tcp")
 public class ModbusTCPController implements ApplicationRunner {
-    public static final NettyServer nettyServer = new NettyServer(502, Math.max(20, Runtime.getRuntime().availableProcessors() - 1));
+    public static NettyServer nettyServer;
 
     @PreDestroy
     private void destroy() {
@@ -105,6 +105,7 @@ public class ModbusTCPController implements ApplicationRunner {
 
     @Override
     public void run(ApplicationArguments args) throws Exception {
+        nettyServer = new NettyServer(502, Math.max(20, Runtime.getRuntime().availableProcessors() - 1));
         nettyServer.start();
     }