Question

java.util.NoSuchElementException 的问题

java.util.NoSuchElementException
at com.google.common.collect.AbstractIterator.next(AbstractIterator.java:154)
at com.google.common.collect.Iterators.find(Iterators.java:712)
at com.google.common.collect.Iterables.find(Iterables.java:643)
at com.fulongkeji.huagang.service.impl.PointServiceImpl.getDPointBySendName(PointServiceImpl.java:35)
at com.fulongkeji.huagang.bean.CalculateEquipmentRuntimeJob.calcRuntime(CalculateEquipmentRuntimeJob.java:88)
at com.fulongkeji.huagang.bean.CalculateEquipmentRuntimeJob.executeInternal(CalculateEquipmentRuntimeJob.java:50)
at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:66)
at org.quartz.core.JobRunShell.run(JobRunShell.java:216)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549)

int newRuntime = 0;
try {
newRuntime = calcRuntime(mapping, calcFromTime(currentTime), currentTime);
}
catch (NoSuchElementException e) {
e.printStackTrace();--程序都会走这儿
continue;
}
if (newRuntime == 0)
continue;

Answer 1

@GwtCompatible
public abstract class AbstractIterator<T> extends UnmodifiableIterator<T> {
// 下面是源码
  @Override
  public final T next() {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    state = State.NOT_READY;
    T result = next;
    next = null;
    return result;
  }

你都看到了。hasNext() 没有值呗。你看看你的集合呗。

追问

point= Iterables.find(allDPoints, new Predicate() { public boolean apply(DPoint point) {
if (sendName.equals(point.getPointSendName().trim()))return true else return false;

追答

return sendName.equals(point.getPointSendName().trim()) ;

还有

    private static void test_afs() {
        final String sendName = "asldjf";
        List allDPoints = new ArrayList();
        DPoint point = new DPoint();
        point.setPointSendName("asldjf");
        allDPoints.add(point);
        try {
            point = Iterables.find(allDPoints, new Predicate<DPoint>() {
                public boolean apply(DPoint point) {
                    return sendName.equals(point.getPointSendName().trim());
                }
            });
            System.out.println(point);
        } catch (NoSuchElementException e) {
            // 本身就没有你查的对象
        }
    }

如果你查询到了。就能显示。如果没有你查询到的对象。就抛出异常。所以首先你自己加上一个try/catch。

Answer 2

类里面，没有某个方法

PointServiceImpl.java:35
行

Answer 3

PointServiceImpl.java文件35行出错 可能是在这个类里面没有找到calcRuntime这个方法