查看范围作为请求范围作出反应

Question

我想用Spring Web MVC创建一个JSF应用程序。作为范围，我使用视图范围。我的问题是bean的行为类似于请求范围。我在Bean的开头初始化了一个对象，但是如果调用save方法，则该对象为null。有谁知道为什么我的豆子会这样呢？

import javax.annotation.PostConstruct;
import javax.enterprise.context.SessionScoped;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import javax.faces.context.FacesContext;
import javax.inject.Inject;
import javax.inject.Named;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

@Named
@ViewScoped
public class DeveloperBean implements Serializable {


    @Inject
    private DeveloperService service;
    public List<DeveloperDTO> developerDTOList = new ArrayList<>();
    public DeveloperDTO selectedDeveloper = new DeveloperDTO();



    public String nametest;


    public DeveloperBean() {

    }

    @PostConstruct
    public void developerBeanInit() {
        selectedDeveloper = new DeveloperDTO();
       // loadDevelopers();


    }

    public void loadDevelopers() {
        List<DeveloperDTO> developerList = service.getDeveloperList();
        if (developerList.isEmpty()) {
            developerList = new ArrayList<>();
        }
        developerDTOList = developerList;
        selectedDeveloper = new DeveloperDTO();

    }

    public void onRowSelect(SelectEvent event) {
        DeveloperDTO dto = (DeveloperDTO) event.getObject();
        FacesMessage msg = new FacesMessage("Developer selected", dto.getName());
        FacesContext.getCurrentInstance().addMessage(null, msg);
    }

    public void onRowUnselect(UnselectEvent event) {
        DeveloperDTO dto = (DeveloperDTO) event.getObject();
        FacesMessage msg = new FacesMessage("Developer unselected", dto.getName());
        FacesContext.getCurrentInstance().addMessage(null, msg);
    }

    public void loadSelectedDevelopers(String name) {
        selectedDeveloper = service.getSelectedDeveloper(name);
    }

    public void save() {
        System.out.println(selectedDeveloper.getName());
        selectedDeveloper = service.save(selectedDeveloper);
    }

    public void delete() {
        service.delete(selectedDeveloper.getName());
    }

    public DeveloperService getService() {
        return service;
    }

    public void setService(DeveloperService service) {
        this.service = service;
    }

    public List<DeveloperDTO> getDeveloperDTOList() {
        return developerDTOList;
    }

    public void setDeveloperDTOList(List<DeveloperDTO> developerDTOList) {
        this.developerDTOList = developerDTOList;
    }

    public DeveloperDTO getSelectedDeveloper() {
        return selectedDeveloper;
    }

    public void setSelectedDeveloper(DeveloperDTO selectedDeveloper) {
        this.selectedDeveloper = selectedDeveloper;
    }

    public String getNametest() {
        return nametest;
    }

    public void setNametest(String nametest) {
        this.nametest = nametest;
    }

}

具体对象是selectedDeveloper对象。调试器的结果是在构造函数中是用空对象初始化的对象。如果我使用质数按钮进入save方法，则该对象为null。我希望有人知道这个问题，可以为我提供帮助