diff --git a/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/Request.java b/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/Request.java
index abd058294b3..e5d233aa9ce 100644
--- a/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/Request.java
+++ b/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/Request.java
@@ -95,8 +95,12 @@ public boolean isEvent() {
     }
 
     public void setEvent(String event) {
-        mEvent = true;
-        mData = event;
+        this.mEvent = true;
+        this.mData = event;
+    }
+
+    public void setEvent(boolean mEvent) {
+        this.mEvent = mEvent;
     }
 
     public boolean isBroken() {
diff --git a/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/codec/ExchangeCodec.java b/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/codec/ExchangeCodec.java
index 4031688e04e..7eb64a12667 100644
--- a/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/codec/ExchangeCodec.java
+++ b/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/codec/ExchangeCodec.java
@@ -43,9 +43,6 @@
 
 /**
  * ExchangeCodec.
- *
- *
- *
  */
 public class ExchangeCodec extends TelnetCodec {
 
@@ -176,7 +173,7 @@ protected Object decodeBody(Channel channel, InputStream is, byte[] header) thro
             req.setVersion(Version.getProtocolVersion());
             req.setTwoWay((flag & FLAG_TWOWAY) != 0);
             if ((flag & FLAG_EVENT) != 0) {
-                req.setEvent(Request.HEARTBEAT_EVENT);
+                req.setEvent(true);
             }
             try {
                 ObjectInput in = CodecSupport.deserialize(channel.getUrl(), is, proto);
diff --git a/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/support/DefaultFuture.java b/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/support/DefaultFuture.java
index f79d99df504..059fdaa04e6 100644
--- a/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/support/DefaultFuture.java
+++ b/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/support/DefaultFuture.java
@@ -126,7 +126,7 @@ public static void sent(Channel channel, Request request) {
      * @param channel channel to close
      */
     public static void closeChannel(Channel channel) {
-        for (Map.Entry<Long, Channel> entry: CHANNELS.entrySet()) {
+        for (Map.Entry<Long, Channel> entry : CHANNELS.entrySet()) {
             if (channel.equals(entry.getValue())) {
                 DefaultFuture future = getFuture(entry.getKey());
                 if (future != null && !future.isDone()) {
@@ -255,7 +255,6 @@ private void invokeCallback(ResponseCallback c) {
         if (callbackCopy == null) {
             throw new NullPointerException("callback cannot be null.");
         }
-        c = null;
         Response res = response;
         if (res == null) {
             throw new IllegalStateException("response cannot be null. url:" + channel.getUrl());
diff --git a/dubbo-remoting/dubbo-remoting-api/src/test/java/org/apache/dubbo/remoting/transport/codec/DeprecatedExchangeCodec.java b/dubbo-remoting/dubbo-remoting-api/src/test/java/org/apache/dubbo/remoting/transport/codec/DeprecatedExchangeCodec.java
index 1dce90c8158..36b58316589 100644
--- a/dubbo-remoting/dubbo-remoting-api/src/test/java/org/apache/dubbo/remoting/transport/codec/DeprecatedExchangeCodec.java
+++ b/dubbo-remoting/dubbo-remoting-api/src/test/java/org/apache/dubbo/remoting/transport/codec/DeprecatedExchangeCodec.java
@@ -167,7 +167,7 @@ protected Object decodeBody(Channel channel, InputStream is, byte[] header) thro
             req.setVersion(Version.getProtocolVersion());
             req.setTwoWay((flag & FLAG_TWOWAY) != 0);
             if ((flag & FLAG_EVENT) != 0) {
-                req.setEvent(Request.HEARTBEAT_EVENT);
+                req.setEvent(true);
             }
             try {
                 ObjectInput in = CodecSupport.deserialize(channel.getUrl(), is, proto);
diff --git a/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/DubboCodec.java b/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/DubboCodec.java
index d6a8e14ed39..9c1e2fc2f25 100644
--- a/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/DubboCodec.java
+++ b/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/DubboCodec.java
@@ -114,7 +114,7 @@ protected Object decodeBody(Channel channel, InputStream is, byte[] header) thro
             req.setVersion(Version.getProtocolVersion());
             req.setTwoWay((flag & FLAG_TWOWAY) != 0);
             if ((flag & FLAG_EVENT) != 0) {
-                req.setEvent(Request.HEARTBEAT_EVENT);
+                req.setEvent(true);
             }
             try {
                 Object data;
@@ -145,6 +145,7 @@ protected Object decodeBody(Channel channel, InputStream is, byte[] header) thro
                 req.setBroken(true);
                 req.setData(t);
             }
+
             return req;
         }
     }