diff --git a/bin/j2/EchoServer.class b/bin/j2/EchoServer.class
index 12d1f22..9274fe1 100644
--- a/bin/j2/EchoServer.class
+++ b/bin/j2/EchoServer.class
Binary files differ
diff --git a/src/j2/EchoServer.java b/src/j2/EchoServer.java
index c82c4cd..9e3a768 100644
--- a/src/j2/EchoServer.java
+++ b/src/j2/EchoServer.java
@@ -31,18 +31,18 @@
             is = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
             os = new PrintStream(clientSocket.getOutputStream());
             // クライアントからのメッセージを待ち、受け取ったメッセージをそのまま返す
-            while (true) {
-                line = is.readLine();
+            while ((line = is.readLine()) != null) {
                 System.out.println("(Server received) " +line);
                 os.println(line);
 //                os.flush();
-                Thread.sleep(1000);
+//                Thread.sleep(1000);
             }
         }
         catch (IOException e) {
             System.out.println(e);
-        } catch (InterruptedException e) {
-			e.printStackTrace();
-		}
+        }
+//        catch (InterruptedException e) {
+//			e.printStackTrace();
+//		}
     }
 }