1.fix npe

luoo_music/src/main/java/com/luoo/music/service/SearchService.java

@@ -1,8 +1,11 @@
 package com.luoo.music.service;
 
+import java.util.Collections;
 import java.util.List;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
+import org.springframework.util.CollectionUtils;
 
 import constants.Constants;
 import net.oschina.j2cache.CacheChannel;
@@ -16,6 +19,9 @@ public class SearchService {
 	public List<String> autoComplete(String query, int limit) {
 		List<String> values = (List<String>) cacheChannel.get(Constants.J2CACHE_REGION_SEARCH_AUTO_COMPLETE, query)
 				.getValue();
+		if (CollectionUtils.isEmpty(values)) {
+			return Collections.emptyList();
+		}
 		return limit < values.size() ? values.subList(0, limit) : values;
 	}
 }