EJB调用失败：javax.ejb.EJBTransactionRolledbackException

Question

我正在学习使用Wildfly Java EE7开发的Java EE Development。现在我遇到了问题，如果我想运行示例代码，我会收到错误：

EJB调用在组件上的失败方法theatreBox for方法public void de.wflydevelopment.chapter4.boundary.TheatreBox.buyTicket（int）：javax.ejb.EJBTransactionRolledbackException

到目前为止，我无法修复问题而且我没有想法会导致此错误。我已经将示例代码与我的相比较，但没有运气。

AutomaticSellerService

Select sum(sumTotal) as mySum,
       case when sum(sumTotal)>25 then 'update' ELSE 'NoUpdate' END AS TopStatistics 
from customertrans 
where  DateTime >= DATEPART(HOUR, '6:00')

TheatreBox

package de.wflydevelopment.chapter4.control;

import java.util.Collection;

import javax.annotation.Resource;
import javax.ejb.Schedule;
import javax.ejb.Stateless;
import javax.ejb.Timer;
import javax.ejb.TimerService;
import javax.inject.Inject;

import org.jboss.logging.Logger;

import de.wflydevelopment.chapter4.boundary.TheatreBox;
import de.wflydevelopment.chapter4.entity.Seat;

@Stateless
public class AutomaticSellerService {

    @Inject
    private Logger logger;

    @Inject
    private TheatreBox theatreBox;

    @Resource
    private TimerService timerService;

    @Schedule(hour = "*", minute = "*", second = "*/30", persistent = false)
    public void automaticCustomer() {
        final Seat seat = findFreeSeat();

        if(seat == null) {
            cancelTimers();
            logger.info("Scheduler gone!");
            return;
        }

        theatreBox.buyTicket(seat.getId());  //I think this line causes the error

        logger.info("Somebody just booked seat number " + seat.getId());
    }

    private Seat findFreeSeat(){
        final Collection<Seat> list = theatreBox.getSeats();
        for(Seat seat : list) {
            if(!seat.isBooked()) {
                return seat;
            }
        }
        return null;
    }

    private void cancelTimers() {
        for(Timer timer : timerService.getTimers()) {
            timer.cancel();
        }
    }

}

编辑1

在package de.wflydevelopment.chapter4.boundary; import java.util.Collection; import java.util.Collections; import java.util.HashMap; import java.util.Map; import java.util.concurrent.TimeUnit; import javax.annotation.PostConstruct; import javax.ejb.AccessTimeout; import javax.ejb.Lock; import javax.ejb.LockType; import javax.ejb.Singleton; import javax.ejb.Startup; import javax.enterprise.event.Event; import javax.inject.Inject; import org.jboss.logging.Logger; import de.wflydevelopment.chapter4.entity.Seat; @Singleton @Startup @AccessTimeout(value = 5, unit = TimeUnit.MINUTES) public class TheatreBox { @Inject private Logger logger; private Map<Integer, Seat> seats; @Inject private Event<Seat> seatEvent; @PostConstruct public void setupTheatre() { seats = new HashMap<>(); int id = 0; for (int i = 0; i < 5; i++) { addSeat(new Seat(++id, "Stalls", 40)); addSeat(new Seat(++id, "Circle", 20)); addSeat(new Seat(++id, "Balcony", 10)); } logger.info("Seat Map constructed."); } private void addSeat(Seat seat) { seats.put(seat.getId(), seat); } @Lock(LockType.READ) public Collection<Seat> getSeats() { return Collections.unmodifiableCollection(seats.values()); } @Lock(LockType.READ) public int getSeatPrice(int seatId) { return getSeat(seatId).getPrice(); } @Lock(LockType.WRITE) public void buyTicket(int seatId) { final Seat seat = getSeat(seatId); final Seat bookedSeat = seat.getBookedSeat(); addSeat(bookedSeat); seatEvent.fire(bookedSeat); } @Lock() private Seat getSeat(int seatId) { final Seat seat = seats.get(seatId); return seat; } } 我可以使用findFreeSeat()但是当我尝试使用theatreBox我的应用程序崩溃时。删除此行也会删除错误。

编辑2

theatreBox.buyTicket(seat.getId());导致seatEvent.fire(bookedSeat);

内的问题

编辑3

theatreBox.buyTicket(seat.getId())

编辑4

Seat.java

package de.wflydevelopment.chapter4.controller;

import java.io.Serializable;

import javax.enterprise.event.Observes;
import javax.faces.view.ViewScoped;
import javax.inject.Named;

import de.wflydevelopment.chapter4.entity.Seat;

@Named
@ViewScoped
public class BookingRecord implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private int bookedCount = 0;

    public int getBookedCount() {
        return bookedCount;
    }

    public void bookEvent(@Observes Seat bookedSeat) {
        bookedCount++;
    }
}