springboot加mybatis线程中编程式事务回滚问题

package com.pt.service;

import com.pt.dao.TicketInspectRecordDao;
import com.pt.model.TicketInspectRecord;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.transaction.support.DefaultTransactionDefinition;

import javax.annotation.Resource;
import java.util.Date;

@Service
public class TicketInspectRecordService {

    @Autowired
    private TicketProductService ticketProductService;
    @Autowired
    private SchedulingService schedulingService;

    @Autowired
    private TicketInspectRecordDao ticketInspectRecordDao;

    @Autowired
    private PlatformTransactionManager transactionManager;

    private Integer stock = 0;

    private final static Object obj = new Object();

    private String msg = "false";

    public String ticket(Integer sd_id) {
        if (sd_id != null) {
            this.stock = schedulingService.findStock(sd_id);
        }
        if (this.stock > 0) {
            TicketInspectRecord ticketInspectRecord = new TicketInspectRecord();
            ticketInspectRecord.setTir_tcr_id(1);
            ticketInspectRecord.setTir_tp_id(1);
            ticketInspectRecord.setTir_u_id(1);
            ticketInspectRecord.setTir_date(new Date());
            Thread thread = new Thread() {
                @Override
                public void run() {
                    synchronized (obj) {
                        DefaultTransactionDefinition def = new DefaultTransactionDefinition();
                        TransactionStatus status = transactionManager.getTransaction(def);
                        try {
                            ticketInspectRecordDao.inTicket(ticketInspectRecord);
                            ticketInspectRecordDao.uStock(sd_id);//这一句必报错误，然后进入rollback方法
                            msg = "true";
                            transactionManager.commit(status);
                        } catch (Exception e) {
                            e.printStackTrace();
                            transactionManager.rollback(status);
                            msg = "false";
                        }
                    }
                }
            };
            thread.start();
            try {
                thread.join();
            }catch (InterruptedException e){
                e.printStackTrace();
            }
        }
        return msg;
    }

}