diff --git a/src/main/java/com/tarzan/recommend/core/ItemCF.java b/src/main/java/com/tarzan/recommend/core/ItemCF.java
index dfa5e97..40add26 100644
--- a/src/main/java/com/tarzan/recommend/core/ItemCF.java
+++ b/src/main/java/com/tarzan/recommend/core/ItemCF.java
@@ -1,11 +1,9 @@
 package com.tarzan.recommend.core;
 
 import com.tarzan.recommend.dto.RelateDTO;
-import org.assertj.core.util.Lists;
 
 import java.util.*;
 import java.util.stream.Collectors;
-import java.util.stream.IntStream;
 
 /**
  * 核心算法
diff --git a/src/main/java/com/tarzan/recommend/core/UserCF.java b/src/main/java/com/tarzan/recommend/core/UserCF.java
index ce552e4..b92fa65 100644
--- a/src/main/java/com/tarzan/recommend/core/UserCF.java
+++ b/src/main/java/com/tarzan/recommend/core/UserCF.java
@@ -32,7 +32,10 @@ public class UserCF {
         double maxValue=Collections.max(userDisMap.values());
         Set<Integer> userIds=userDisMap.entrySet().stream().filter(e->e.getValue()==maxValue).map(Map.Entry::getKey).collect(Collectors.toSet());
         //取关系最近的用户
-        Integer nearestUserId = userIds.stream().findAny().get();
+        Integer nearestUserId = userIds.stream().findAny().orElse(null);
+        if(nearestUserId==null){
+            return Collections.emptyList();
+        }
         //最近邻用户看过电影列表
         List<Integer>  neighborItems = userMap.get(nearestUserId).stream().map(RelateDTO::getItemId).collect(Collectors.toList());
         //指定用户看过电影列表