add machine

recommend-server-service/src/main/java/com/tzld/piaoquan/recommend/server/common/base/RankItem.java

@@ -3,6 +3,7 @@ package com.tzld.piaoquan.recommend.server.common.base;
 import com.tzld.piaoquan.recommend.server.model.Video;
 import lombok.Data;
 
+import java.util.HashMap;
 import java.util.Map;
 
 
@@ -21,8 +22,8 @@ public class RankItem implements Comparable<RankItem> {
         this.video = video;
     }
 
-    private Map<String, Double> rankerScore;
-    private Map<String, Integer> rankerIndex;
+    private Map<String, Double> rankerScore = new HashMap<>();
+    private Map<String, Integer> rankerIndex = new HashMap<>();
 
 
     @Override