diff --git a/skywalking-analysis/src/test/java/com/ai/cloud/skywalking/analysis/mapper/CallChainMapperTest.java b/skywalking-analysis/src/test/java/com/ai/cloud/skywalking/analysis/mapper/CallChainMapperTest.java
index 4a76073e0..d80afbc14 100644
--- a/skywalking-analysis/src/test/java/com/ai/cloud/skywalking/analysis/mapper/CallChainMapperTest.java
+++ b/skywalking-analysis/src/test/java/com/ai/cloud/skywalking/analysis/mapper/CallChainMapperTest.java
@@ -15,13 +15,12 @@ import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.*;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.io.Text;
+import org.junit.Test;
 
 import java.io.IOException;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
-import java.util.ArrayList;
-import java.util.Iterator;
-import java.util.List;
+import java.util.*;
 
 /**
  * Created by astraea on 2016/1/15.