diff --git a/build.gradle b/build.gradle
index 65f0778..a2cb5c9 100644
--- a/build.gradle
+++ b/build.gradle
@@ -13,8 +13,8 @@
 
 group = 'com.ntlab'
 version = '0.0.1-SNAPSHOT'
-sourceCompatibility = '17'
-//ext['tomcat.version'] = '9.0.62'
+sourceCompatibility = '11'
+ext['tomcat.version'] = '9.0.10'
 
 repositories {
     mavenCentral()
diff --git a/src/main/java/com/ntlab/irisserver/IrisServerApplication.java b/src/main/java/com/ntlab/irisserver/IrisServerApplication.java
index fd81885..4942aec 100644
--- a/src/main/java/com/ntlab/irisserver/IrisServerApplication.java
+++ b/src/main/java/com/ntlab/irisserver/IrisServerApplication.java
@@ -1,18 +1,10 @@
 package com.ntlab.irisserver;
 
-import com.ntlab.irisserver.entities.Member;
-import com.ntlab.irisserver.entities.Room;
-import com.ntlab.irisserver.models.KeywordManager;
-import com.ntlab.irisserver.models.RoomManager;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.ApplicationContext;
-import org.springframework.web.bind.annotation.RestController;
 
 import java.io.IOException;
-import java.util.Collections;
-import java.util.List;
-import java.util.Random;
 
 @SpringBootApplication
 public class IrisServerApplication {
diff --git a/src/main/java/com/ntlab/irisserver/JerseyConfig.java b/src/main/java/com/ntlab/irisserver/JerseyConfig.java
index cc87b2d..c5a2743 100644
--- a/src/main/java/com/ntlab/irisserver/JerseyConfig.java
+++ b/src/main/java/com/ntlab/irisserver/JerseyConfig.java
@@ -3,8 +3,6 @@
 import org.glassfish.jersey.server.ResourceConfig;
 import org.springframework.stereotype.Component;
 
-import javax.ws.rs.ApplicationPath;
-
 @Component
 public class JerseyConfig extends ResourceConfig {
 
diff --git a/src/main/java/com/ntlab/irisserver/WebSocketConfig.java b/src/main/java/com/ntlab/irisserver/WebSocketConfig.java
index 0b0336d..20edbf3 100644
--- a/src/main/java/com/ntlab/irisserver/WebSocketConfig.java
+++ b/src/main/java/com/ntlab/irisserver/WebSocketConfig.java
@@ -15,10 +15,10 @@
         //registry.addHandler(helloWorldWebSocket2(), "/hello-websocket2");
     }
 
-    @Bean
-    public HelloWebSocket helloWebSocket() {
-        return new HelloWebSocket();
-    }
+//    @Bean
+//    public HelloWebSocket helloWebSocket() {
+//        return new HelloWebSocket();
+//    }
 
     @Bean
     public ServerEndpointExporter serverEndpointExporter() {
diff --git a/src/test/java/com/ntlab/irisserver/IrisServerApplicationTests.java b/src/test/java/com/ntlab/irisserver/IrisServerApplicationTests.java
index 2c59dd8..abab0e8 100644
--- a/src/test/java/com/ntlab/irisserver/IrisServerApplicationTests.java
+++ b/src/test/java/com/ntlab/irisserver/IrisServerApplicationTests.java
@@ -1,7 +1,7 @@
 package com.ntlab.irisserver;
 
-import org.junit.jupiter.api.Test;
-import org.springframework.boot.test.context.SpringBootTest;
+//import org.junit.jupiter.api.Test;
+//import org.springframework.boot.test.context.SpringBootTest;
 
 //@SpringBootTest
 //class IrisServerApplicationTests {