diff --git a/liteflow-core/src/main/java/com/yomahub/liteflow/entity/flow/WhenConditionThread.java b/liteflow-core/src/main/java/com/yomahub/liteflow/entity/flow/WhenConditionThread.java
index 4ea810478..22df695b4 100644
--- a/liteflow-core/src/main/java/com/yomahub/liteflow/entity/flow/WhenConditionThread.java
+++ b/liteflow-core/src/main/java/com/yomahub/liteflow/entity/flow/WhenConditionThread.java
@@ -1,7 +1,5 @@
 package com.yomahub.liteflow.entity.flow;
 
-import com.yomahub.liteflow.core.FlowExecutor;
-import com.yomahub.liteflow.core.NodeComponent;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
diff --git a/liteflow-core/src/main/java/com/yomahub/liteflow/monitor/MonitorBus.java b/liteflow-core/src/main/java/com/yomahub/liteflow/monitor/MonitorBus.java
index 0e01f8301..9e31ae88c 100644
--- a/liteflow-core/src/main/java/com/yomahub/liteflow/monitor/MonitorBus.java
+++ b/liteflow-core/src/main/java/com/yomahub/liteflow/monitor/MonitorBus.java
@@ -40,7 +40,7 @@ public class MonitorBus {
 
 	private long period = 5*60*1000;
 
-	private Logger LOG = LoggerFactory.getLogger(this.getClass());
+	private final Logger LOG = LoggerFactory.getLogger(this.getClass());
 
 	private final ConcurrentHashMap<String, BoundedPriorityQueue<CompStatistics>> statisticsMap = new ConcurrentHashMap<>();