diff --git a/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/entity/metrics/BaseMetrics.java b/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/entity/metrics/BaseMetrics.java
index 2ab9af97..c6ce6351 100644
--- a/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/entity/metrics/BaseMetrics.java
+++ b/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/entity/metrics/BaseMetrics.java
@@ -36,7 +36,7 @@ public abstract class BaseMetrics implements Serializable {
         return metrics.get(key);
     }
 
-    public BaseMetrics(Long clusterPhyId){
+    protected BaseMetrics(Long clusterPhyId) {
         this.clusterPhyId = clusterPhyId;
     }
 
diff --git a/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/BrokerMetricEvent.java b/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/BrokerMetricEvent.java
index 150e7b7a..afba5938 100644
--- a/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/BrokerMetricEvent.java
+++ b/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/BrokerMetricEvent.java
@@ -11,7 +11,7 @@ import java.util.List;
 @Getter
 public class BrokerMetricEvent extends BaseMetricEvent{
 
-    private List<BrokerMetrics> brokerMetrics;
+    private final List<BrokerMetrics> brokerMetrics;
 
     public BrokerMetricEvent(Object source, List<BrokerMetrics> brokerMetrics) {
         super( source );
diff --git a/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/ClusterMetricEvent.java b/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/ClusterMetricEvent.java
index e4a16c99..aaf38896 100644
--- a/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/ClusterMetricEvent.java
+++ b/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/ClusterMetricEvent.java
@@ -11,7 +11,7 @@ import java.util.List;
 @Getter
 public class ClusterMetricEvent extends BaseMetricEvent{
 
-    private List<ClusterMetrics> clusterMetrics;
+    private final List<ClusterMetrics> clusterMetrics;
 
     public ClusterMetricEvent(Object source, List<ClusterMetrics> clusterMetrics) {
         super( source );
diff --git a/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/GroupMetricEvent.java b/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/GroupMetricEvent.java
index 600daa46..24ce93ca 100644
--- a/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/GroupMetricEvent.java
+++ b/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/GroupMetricEvent.java
@@ -11,7 +11,7 @@ import java.util.List;
 @Getter
 public class GroupMetricEvent extends BaseMetricEvent{
 
-    private List<GroupMetrics> groupMetrics;
+    private final List<GroupMetrics> groupMetrics;
 
     public GroupMetricEvent(Object source, List<GroupMetrics> groupMetrics) {
         super( source );
diff --git a/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/PartitionMetricEvent.java b/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/PartitionMetricEvent.java
index a2654ea5..0bc09b38 100644
--- a/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/PartitionMetricEvent.java
+++ b/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/PartitionMetricEvent.java
@@ -11,7 +11,7 @@ import java.util.List;
 @Getter
 public class PartitionMetricEvent extends BaseMetricEvent{
 
-    private List<PartitionMetrics> partitionMetrics;
+    private final List<PartitionMetrics> partitionMetrics;
 
     public PartitionMetricEvent(Object source, List<PartitionMetrics> partitionMetrics) {
         super( source );
diff --git a/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/ReplicaMetricEvent.java b/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/ReplicaMetricEvent.java
index bc4f0c10..9b71a69b 100644
--- a/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/ReplicaMetricEvent.java
+++ b/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/ReplicaMetricEvent.java
@@ -11,7 +11,7 @@ import java.util.List;
 @Getter
 public class ReplicaMetricEvent extends BaseMetricEvent{
 
-    private List<ReplicationMetrics> replicationMetrics;
+    private final List<ReplicationMetrics> replicationMetrics;
 
     public ReplicaMetricEvent(Object source, List<ReplicationMetrics> replicationMetrics) {
         super( source );
diff --git a/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/TopicMetricEvent.java b/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/TopicMetricEvent.java
index 299afe01..359ef2a0 100644
--- a/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/TopicMetricEvent.java
+++ b/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/TopicMetricEvent.java
@@ -11,7 +11,7 @@ import java.util.List;
 @Getter
 public class TopicMetricEvent extends BaseMetricEvent{
 
-    private List<TopicMetrics> topicMetrics;
+    private final List<TopicMetrics> topicMetrics;
 
     public TopicMetricEvent(Object source, List<TopicMetrics> topicMetrics) {
         super( source );
diff --git a/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/ZookeeperMetricEvent.java b/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/ZookeeperMetricEvent.java
index 19279d53..261440d6 100644
--- a/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/ZookeeperMetricEvent.java
+++ b/km-common/src/main/java/com/xiaojukeji/know/streaming/km/common/bean/event/metric/ZookeeperMetricEvent.java
@@ -11,7 +11,7 @@ import java.util.List;
 @Getter
 public class ZookeeperMetricEvent extends BaseMetricEvent {
 
-    private List<ZookeeperMetrics> zookeeperMetrics;
+    private final List<ZookeeperMetrics> zookeeperMetrics;
 
     public ZookeeperMetricEvent(Object source, List<ZookeeperMetrics> zookeeperMetrics) {
         super( source );