当我使用调度程序在服务器启动函数上调用方法EJB时，空指针

Question

大家好，我试图达到一个方法EJB当我启动服务器WildFly，我希望该方法执行每5秒钟，这就是为什么我使用类Schedular，但问题是，当我执行服务器这个异常出现在我面前

02:12:54738错误[stderr]（定时器2）javax.naming。NameNotFoundException:映射JavaEE ear/Map JavaEE ejb/ProjectService！tn.esprit.Map.interfaces（接口）。ProjectRemote--org.jboss.as.naming.ServiceBasedNamingStore.lookup（ServiceBasedNamingStore.java:106）02:12:54738 ERROR[stderr]（Timer-2）在org.jboss.as.naming.InitialContext$DefaultInitialContext.lookup（InitialContext.java:235）02:12:54738 ERROR[stderr]（Timer-1）在org.jboss.as.naming.NamingContext.loukup（NamingContext.java：193）02:14:54738 ERROR[stderr]（Timer-2）在.org.jboss.as.naming.Nameing.Context.loolookup（naming-Context.jawa:189）02:1:22:54738ERROR[stderr]（Timer-2）在javax.naming.Initial Context。查找（未知源）02:12:54738 ERROR[stderr]（Timer-2）at javax.naming.InitialContext。查找（未知源）02:12:54738 ERROR[stderr]（Timer-2），位于tn.esprit.Map.utilities.Schedular.run（Schedular.java:23）02:14:54738错误[stderr]（Timer-2），位于java.util.TimerThread。mainLoop（未知源）02:12:54738 ERROR[stderr]（Timer-2）at java.util.TimerThread。运行（未知源）

这是我的ClassService

@Stateless
public class ProjectService implements ProjectRemote {
@PersistenceContext(unitName = "MAP")
private EntityManager em;

@Override
public List<Project> getAllProjects() {
    Query query = em.createQuery(
            "SELECT p.id ,p.projectName , p.startDate" + " , p.endDate , p.address , p.totalNumberResource ,"
                    + " p.levioNumberResource,p.picture, p.projectType  FROM Project p");
    List<Object[]> res = query.getResultList();
    List<Project> projects = new ArrayList<Project>();
    res.forEach(array -> {
        Project project = arrayToProject(array);
        projects.add(project);
    });

    return projects;
}

public Project arrayToProject(Object[] array){
    Project project = new Project();
    project.setId((int) array[0]);
    project.setProjectName((String) array[1]);
    project.setStartDate((Date) array[2]);
    project.setEndDate((Date) array[3]);
    project.setAddress((String) array[4]);
    project.setTotalNumberResource((int) array[5]);
    project.setLevioNumberResource((int) array[6]);
    project.setPicture((String) array[7]);
    project.setProjectType((ProjectType) array[8]);

    return project;
}
    @Override
public String archiveProject() throws ParseException {
    List<Project> projects = this.getAllProjects();
    DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
    Date date = new Date();
    ArchivedProjects archivedProjects = new ArchivedProjects();
    for (Project project : projects) {
        archivedProjects.setId(project.getId());
        archivedProjects.setProjectName(project.getProjectName());
        archivedProjects.setProjectType(project.getProjectType());
        archivedProjects.setAddress(project.getAddress());
        archivedProjects.setClient(project.getClient());
        archivedProjects.setStartDate(project.getStartDate());
        archivedProjects.setEndDate(project.getEndDate());
        archivedProjects.setLevioNumberResource(project.getLevioNumberResource());
        archivedProjects.setTotalNumberResource(project.getTotalNumberResource());
        archivedProjects.setOrganizationalChart(project.getOrganizationalChart());
        archivedProjects.setPicture(project.getPicture());
        if ((dateFormat.format(date).compareTo(project.getEndDate().toString()) > 0)) {
            em.remove(em.contains(project) ? project : em.merge(project));
            em.persist(em.contains(archivedProjects) ? archivedProjects : em.merge(archivedProjects));
        }

        System.out.println(project.getEndDate().toString() + "   " + dateFormat.format(date).toString());
    }
    return "Archived";

}

我的日程安排类：

@ManagedBean
public class Schedular extends TimerTask{
@EJB
ProjectRemote projectRemote;
@Override
public void run() {

    try {
        projectRemote.archiveProject();
    } catch (ParseException e) {
        e.printStackTrace();
    }

}
}

最后，在这里我调用EJB方法：

@SuppressWarnings("serial")
public class StartUpService extends HttpServlet {

Schedular sc = new Schedular();
public void init() throws ServletException {
    Timer timer = new  Timer()  ;
    timer.scheduleAtFixedRate(sc,5000,1000);
}
}

有人能帮忙吗？

Answer 1

您必须在服务中添加注释LocalBean。

导入javax.ejb.LocalBean；

@Stateless
@LocalBean
public class ProjectService implements ProjectRemote {
@PersistenceContext(unitName = "MAP")
private EntityManager em;
/**/
}

Answer 2

您可以将以下单例添加到您的EJB模块中(或者在archiveProject方法中添加schedule注释)

@Singleton
    public class ProjectArchivingScheduler {

        @EJB
        ProjectRemote projectRemote;

        @Schedule(minute = "*", hour = "*", second = "*/5", persistent = false)
        public void refresh() {
            projectRemote.archiveProject();
        }
    }