在休眠插入返回错误

Question

我有两个表：td和last_td。我写了这个函数：

CREATE OR REPLACE FUNCTION f_find_last_td()
RETURNS trigger AS
$BODY$
DECLARE
BEGIN
    delete from last_td;

    insert into last_td
        select
            t1.name,
            t1.max,
            t2.due_date,
            t2.fixed_rate,
            t2.unit_price,
            t2.reading_time
        from (select
                t2.name,
                max(t2.reading_date)
                from td t2
                where
                t2.reading_date > now() 
                group by t2.name) t1,
                td t2
        where
            t1.name = t2.name
            and t1.max = t2.reading_date;
    commit;
RETURN NEW;
END;
$BODY$
LANGUAGE plpgsql

用作触发器，如下所示：

CREATE TRIGGER tr_find_last_td
AFTER INSERT OR UPDATE
ON td
EXECUTE PROCEDURE f_find_last_td();

我在Wildfly 10.1.0.Final上使用hibernate 5.0.10.Final运行Java应用程序<property name="hibernate.hbm2ddl.auto" value="validate"/>

但现在每次hibernate尝试将数据插入td时，都会输出此错误：

 Hint: Use a BEGIN block with an EXCEPTION clause instead.
 Where: PL/pgSQL function f_find_last_td() line 25 at SQL statement
 14:21:00,425 INFO [org.hibernate.engine.jdbc.batch.internal.AbstractBatchImpl] (EJB default - 9) HHH000010: On release of batch it still contained JDBC statements

当然我可以添加EXCEPTION来捕获它，但为什么我会收到此错误？