Spring事务报错，不知道什么原因

    public MessageBean modiCertificateState(String data, Integer state,String remark) {
        DefaultTransactionDefinition def = new DefaultTransactionDefinition();
        TransactionStatus transactionStatus = transactionManager.getTransaction(def);
        transactionManager.rollback(transactionStatus);
        return null;
    }

org.springframework.transaction.UnexpectedRollbackException: Transaction rolled back because it has been marked as rollback-only
怎么会这样？？？

找到错误了，不知道谁在service类上加了事务，spring事务可以加在类上吗？？？第一次看到有这么写的