add try catch

@@ -2,17 +2,22 @@ package com.yoho.search.service.recall.models.personal;
 
 import com.yoho.search.core.personalized.models.PersonalizedSearch;
 import org.apache.commons.lang.StringUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.util.ArrayList;
 import java.util.List;
 
 public class UserFeatureFactor {
 
+	private static final Logger logger = LoggerFactory.getLogger(UserFeatureFactor.class);
+
 	private List<Double> userFeatureVectorList = null;
 	private double userFeatureVectorNorm = 0.0D;
 	private String vectorFeatureVersion;
 
 	public UserFeatureFactor(PersonalizedSearch personalizedSearch) {
+		try {
 			if (personalizedSearch == null) {
 				return;
 			}
@@ -31,6 +36,9 @@ public class UserFeatureFactor {
 				userFeatureVectorList.add(userFeatureVector);
 				userFeatureVectorNorm += userFeatureVector * userFeatureVector;
 			}
+		}catch (Exception e){
+			logger.error(e.getMessage());
+		}
 	}
 
 	public List<Double> getUserFeatureVectorList() {