diff --git a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushService.java b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushService.java
index 9328afd..2e2054e 100644
--- a/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushService.java
+++ b/cim-client-sdk/cim-android-sdk/src/main/java/com/farsunset/cim/sdk/android/CIMPushService.java
@@ -56,7 +56,7 @@ public class CIMPushService extends Service {
     @Override
     public void onCreate() {
         connectorManager = CIMConnectorManager.getManager(this.getApplicationContext());
-        notificationManager = getSystemService(NotificationManager.class);
+        notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
 
             keepAliveReceiver = new KeepAliveBroadcastReceiver();
diff --git a/cim-server-sdk/cim-server-sdk-netty/src/main/java/com/farsunset/cim/sdk/server/coder/WebMessageDecoder.java b/cim-server-sdk/cim-server-sdk-netty/src/main/java/com/farsunset/cim/sdk/server/coder/WebMessageDecoder.java
index 80762f3..476868d 100644
--- a/cim-server-sdk/cim-server-sdk-netty/src/main/java/com/farsunset/cim/sdk/server/coder/WebMessageDecoder.java
+++ b/cim-server-sdk/cim-server-sdk-netty/src/main/java/com/farsunset/cim/sdk/server/coder/WebMessageDecoder.java
@@ -17,7 +17,7 @@ public class WebMessageDecoder extends SimpleChannelInboundHandler<Object> {
 
     private final static String URI = "ws://localhost:%d";
 
-    private static ConcurrentHashMap<String, WebSocketServerHandshaker> handShakerMap = new ConcurrentHashMap<>();
+    private static final ConcurrentHashMap<String, WebSocketServerHandshaker> handShakerMap = new ConcurrentHashMap<>();
 
     private static final Logger LOGGER = LoggerFactory.getLogger(WebMessageDecoder.class);
 
diff --git a/cim-server-sdk/cim-server-sdk-netty/src/main/java/com/farsunset/cim/sdk/server/handler/CIMNioSocketAcceptor.java b/cim-server-sdk/cim-server-sdk-netty/src/main/java/com/farsunset/cim/sdk/server/handler/CIMNioSocketAcceptor.java
index 8a847e8..5825b3e 100644
--- a/cim-server-sdk/cim-server-sdk-netty/src/main/java/com/farsunset/cim/sdk/server/handler/CIMNioSocketAcceptor.java
+++ b/cim-server-sdk/cim-server-sdk-netty/src/main/java/com/farsunset/cim/sdk/server/handler/CIMNioSocketAcceptor.java
@@ -54,8 +54,8 @@ import java.util.concurrent.ConcurrentHashMap;
 public class CIMNioSocketAcceptor{
 	private static final Logger LOGGER = LoggerFactory.getLogger(CIMNioSocketAcceptor.class);
 
-	private HashMap<String, CIMRequestHandler> innerHandlerMap = new HashMap<>();
-    private ConcurrentHashMap<String,Channel> channelGroup = new ConcurrentHashMap<>();
+	private final HashMap<String, CIMRequestHandler> innerHandlerMap = new HashMap<>();
+    private final ConcurrentHashMap<String,Channel> channelGroup = new ConcurrentHashMap<>();
 
 
 	private EventLoopGroup appBossGroup;
diff --git a/cim-use-examples/cim-client-android/app/libs/cim-android-sdk-3.8.0.jar b/cim-use-examples/cim-client-android/app/libs/cim-android-sdk-3.8.0.jar
index fd3b2d3..91f1eac 100644
Binary files a/cim-use-examples/cim-client-android/app/libs/cim-android-sdk-3.8.0.jar and b/cim-use-examples/cim-client-android/app/libs/cim-android-sdk-3.8.0.jar differ