从Controller获取随机索引的JSON数组

Question

我使用Spring MVC和Hibernate构建Web服务，我的问题是我得到了随机索引的json数组，我在我的DAOImpl上应用了Ordering方法，但这根本没有效果。例如，我第一次执行

[{"id":23,"name":"apple"},{"id":21,"name":"mango"},{"id":27,"name":"grape"},{"id":14,"name":"melon"},{"id":7,"name":"banana"}]

然后在我得到的第二次执行

[{"id":14,"name":"melon"},{"id":27,"name":"grape"},{"id":7,"name":"banana"},{"id":23,"name":"apple"},{"id":21,"name":"mango"}]

并且总是在另一个执行中随机编入索引

这是我的代码

控制器

@ResponseBody
@Transactional
@RequestMapping(value="json/dosen/getMakul", method=RequestMethod.POST)
public String getMakulByDosen(@RequestParam(required=true) Integer dosenid) {
    String json=null;

    List<ModelMakul> listMakul = makulservice.getListMakulByDosen(dosenid, null);

    Map<String,Object> data = new HashMap<String,Object>();

    data.put("makul", listMakul);

    try {
        ObjectMapper obj = new ObjectMapper();
        json = obj.writeValueAsString(data);
    } catch (Exception e) {
        e.printStackTrace();
    }

    return json;
}

DAOImpl

public List<ModelMakul> getListMakulByDosen(Integer id, Integer page) {
    // TODO Auto-generated method stub
    List<ModelMakul> list = new ArrayList<ModelMakul>();

    Criteria c = getCurrentSession().createCriteria(ModelMakul.class);

    c.add(Restrictions.eq("dosen.id", id));

    if(page!=null) {
        c.setFirstResult((page-1)*LISTSIZE);
        c.setMaxResults(LISTSIZE);
    }

    c.addOrder(Order.desc("id"));

    list.addAll(c.list());

    if(page==null) {
        setTotalPage(c);
    }

    return list;
}

模型1

package id.ac.undip.mlearning.model;

import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;

import org.codehaus.jackson.annotate.JsonIgnore;
import org.hibernate.annotations.Type;

@Entity
@Table(name="tbl_dosen")
public class ModelDosen {

    @Id
    @GeneratedValue
    @Type(type="java.lang.Integer")
    @Column(name="id_dosen")
    private Integer id;

    @Column(name="nip")
    private String nip;

    @Column(name="nama")
    private String nama;

    @ManyToOne
    @JoinColumn(name="id_jurusan")
    private ModelJurusan jurusan;

    @OneToMany(cascade = { CascadeType.ALL }, orphanRemoval = true,mappedBy="dosen")
    @JsonIgnore
    private Set<ModelMakul> makul;

    @OneToMany(mappedBy="dosen")
    @JsonIgnore
    private Set<ModelMateri> materi;

    @Column(name="username")
    private String username;

    @Column(name="password")
    private String password;




    public Set<ModelMateri> getMateri() {
        return materi;
    }
    public void setMateri(Set<ModelMateri> materi) {
        this.materi = materi;
    }
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }

    public Set<ModelMakul> getMakul() {
        return makul;
    }
    public void setMakul(Set<ModelMakul> makul) {
        this.makul = makul;
    }
    public String getNip() {
        return nip;
    }
    public void setNip(String nip) {
        this.nip = nip;
    }

    public String getNama() {
        return nama;
    }
    public void setNama(String nama) {
        this.nama = nama;
    }

    public ModelJurusan getJurusan() {
        return jurusan;
    }
    public void setJurusan(ModelJurusan jurusan) {
        this.jurusan = jurusan;
    }

    public String getUsername() {
        return username;
    }


    public void setUsername(String username) {
        this.username = username;
    }


    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

模型2

package id.ac.undip.mlearning.model;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import org.codehaus.jackson.annotate.JsonIgnore;
import org.hibernate.annotations.Type;

@Entity
@Table(name="tbl_makul")
public class ModelMakul {

    @Id
    @GeneratedValue
    @Type(type="java.lang.Integer")
    @Column(name="id_makul")
    private Integer id;

    @ManyToOne
    @JoinColumn(name="id_jurusan")
    private ModelJurusan jurusan;

    @Column(name="kode_makul")
    private String kode;

    @Column(name="nama")
    private String nama;

    @Column(name="semester")
    private Integer semester;

    @ManyToOne
    @JoinColumn(name="id_dosen")
    private ModelDosen dosen;

    @OneToMany(mappedBy="makul")
    private Set<ModelMateri> materi;

    public Set<ModelMateri> getMateri() {
        return materi;
    }

    public void setMateri(Set<ModelMateri> materi) {
        this.materi = materi;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public ModelJurusan getJurusan() {
        return jurusan;
    }

    public void setJurusan(ModelJurusan jurusan) {
        this.jurusan = jurusan;
    }

    public String getKode() {
        return kode;
    }

    public void setKode(String kode) {
        this.kode = kode;
    }

    public String getNama() {
        return nama;
    }

    public void setNama(String nama) {
        this.nama = nama;
    }

    public Integer getSemester() {
        return semester;
    }

    public void setSemester(Integer semester) {
        this.semester = semester;
    }

    public ModelDosen getDosen() {
        return dosen;
    }

    public void setDosen(ModelDosen dosen) {
        this.dosen = dosen;
    }

}

我在这里做错了什么？

对不起英语不好