Statement cancelled due to timeout or client request这个异常的原因是什么?

在使用mybatis的批量新增出现Statement cancelled due to timeout or client request这个异常.下面代码是使用批量新增的方法:

public void batchUpdate(String str, List objs )throws ServerSqlErrorException{
        SqlSessionFactory sqlSessionFactory = sqlSessionTemplate.getSqlSessionFactory();
        //批量执行器
        SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH,false);
        try{
            if(objs!=null){
                for(int i=0,size=objs.size();i<size;i++){
                    sqlSession.update(str, objs.get(i));
                }
                sqlSession.flushStatements();
                sqlSession.commit();
                sqlSession.clearCache();
            }
        }catch (Exception e){
            throw new ServerSqlErrorException(e);
        }finally{
            sqlSession.close();
        }
    }

求解

设置defaultStatementTimeout="60"