update

mec-biz/src/main/java/com/ym/mec/biz/dal/entity/StudentExtracurricularExercisesSituation.java

@@ -232,6 +232,9 @@ public class StudentExtracurricularExercisesSituation extends BaseEntity {
 		Object[] objs = { monday, studentId, teacherId, serveType };
 		int result = 1;
 		for (Object obj : objs) {
+			if(obj == null){
+				continue;
+			}
 			result = 31 * result + obj.hashCode();
 		}
 		return result;