diff --git a/src/main/java/com/loafle/commons/server/Server.java b/src/main/java/com/loafle/commons/server/Server.java
index ccc6b3c..3d4a529 100644
--- a/src/main/java/com/loafle/commons/server/Server.java
+++ b/src/main/java/com/loafle/commons/server/Server.java
@@ -82,10 +82,18 @@ public abstract class Server {
     return serverBootstrap.bind(address).sync();
   }
 
-  protected abstract void init() throws Exception;
-  protected abstract void onStart() throws Exception;
-  protected abstract void onStop() throws Exception;
-  protected abstract void destroy() throws Exception;
+  protected void init() throws Exception {
+    // no op
+  }
+  protected void onStart() throws Exception {
+    // no op
+  }
+  protected void onStop() throws Exception {
+    // no op
+  }
+  protected void destroy() throws Exception {
+    // no op
+  }
 
   public static class ChannelOptionItem<T> {
     private final ChannelOption<T> option;