diff --git a/proxy-protocol/Constants.java b/proxy-protocol/Constants.java
deleted file mode 100644
index d15aee5..0000000
--- a/proxy-protocol/Constants.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package org.fengfei.lanproxy.server;
-
-import io.netty.channel.Channel;
-import io.netty.util.AttributeKey;
-
-public interface Constants {
-
-    public static final AttributeKey<Channel> NEXT_CHANNEL = AttributeKey.newInstance("nxt_channel");
-
-    public static final AttributeKey<String> USER_ID = AttributeKey.newInstance("user_id");
-
-    public static final AttributeKey<String> CLIENT_KEY = AttributeKey.newInstance("client_key");
-}
diff --git a/proxy-protocol/src/main/java/org/fengfei/lanproxy/protocol/Constants.java b/proxy-protocol/src/main/java/org/fengfei/lanproxy/protocol/Constants.java
index d4c4317..ac095e6 100644
--- a/proxy-protocol/src/main/java/org/fengfei/lanproxy/protocol/Constants.java
+++ b/proxy-protocol/src/main/java/org/fengfei/lanproxy/protocol/Constants.java
@@ -5,9 +5,9 @@ import io.netty.util.AttributeKey;
 
 public interface Constants {
 
-    public static final AttributeKey<Channel> NEXT_CHANNEL = AttributeKey.newInstance("nxt_channel");
+     AttributeKey<Channel> NEXT_CHANNEL = AttributeKey.newInstance("nxt_channel");
 
-    public static final AttributeKey<String> USER_ID = AttributeKey.newInstance("user_id");
+     AttributeKey<String> USER_ID = AttributeKey.newInstance("user_id");
 
-    public static final AttributeKey<String> CLIENT_KEY = AttributeKey.newInstance("client_key");
+     AttributeKey<String> CLIENT_KEY = AttributeKey.newInstance("client_key");
 }