REST服务子数据未持久保存到derby数据库

Question

我有主要实体和子实体。主要实体的数据持久化到derby数据库。但是子数据不能持久保存

我尝试更改XML输入仍然无法正常工作。当我在子实体上对数据进行硬编码时，硬编码的数据将保留到derby数据库中。我注意到数据到达的是父实体而不是子实体 父母：

@Entity
@XmlRootElement
public class Subject implements Serializable {

private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
private Float cost;
@Temporal(javax.persistence.TemporalType.DATE)
private Date reportDate;
@Temporal(javax.persistence.TemporalType.DATE)
private Date creationdate = new Date();
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
private List<Qualification> qualifications;

public Subject() {
}

public Subject(Long id, String name, Float cost, Date reportDate,     List<Qualification> qualifications) {
    this.id = id;
    this.name = name;
    this.cost = cost;
    this.reportDate = reportDate;
    this.qualifications = qualifications;
}

public List<Qualification> getQualifications() {
    return qualifications;
}

public void setQualifications(List<Qualification> qualifications) {
    this.qualifications = qualifications;
}

public String getName() {
    return name;
}

public Float getCost() {
    return cost;
}

public Date getReportDate() {
    return reportDate;
}

public Long getId() {
    return id;
}

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

public Date getCreationdate() {
    return creationdate;
}

public void setName(String name) {
    this.name = name;
}

public void setCost(Float cost) {
    this.cost = cost;
}

public void setReportDate(Date reportDate) {
    this.reportDate = reportDate;
}

public void setCreationdate(Date creationdate) {
    this.creationdate = creationdate;
}






@Override
public int hashCode() {
    int hash = 0;
    hash += (id != null ? id.hashCode() : 0);
    return hash;
}

@Override
public boolean equals(Object object) {
    // TODO: Warning - this method won't work in the case the id fields are not set
    if (!(object instanceof Subject)) {
        return false;
    }
    Subject other = (Subject) object;
    if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
        return false;
    }
    return true;
}

@Override
public String toString() {
    return "za.ac.tut.entity.Subject[ id=" + id + " ]";
}


public Qualification qualificationMethod(){
    Qualification q =new Qualification();
    q.setCode("nn");
    q.setQname("tt");
    return q;
}
}

孩子：

@Entity
@XmlRootElement
public class Qualification implements Serializable {


public Qualification() {
}
public Qualification(String qname, String code) {
    this.qname = qname;
    this.code = code;
}

public String getCode() {
    return code;
}

public void setCode(String code) {
    this.code = code;
}

 public String getQname() {
    return qname;
}

public void setQname(String qname) {
    this.qname = qname;
}

public Long getId() {
    return id;
}
  public void setId(Long id) {
    this.id = id;
}

@Override
public int hashCode() {
    int hash = 0;
    hash += (id != null ? id.hashCode() : 0);
    return hash;
}
@Override
public boolean equals(Object object) {
    // TODO: Warning - this method won't work in the case the id fields are not set
    if (!(object instanceof Qualification)) {
        return false;
    }
    Qualification other = (Qualification) object;
    if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
        return false;
    }
    return true;
}
@Override
public String toString() {
    return "za.ac.tut.entity.Qualifications[ id=" + id + " ]";
}

}

Sevlet：

public class addSubjectServlet extends HttpServlet {

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    String id = request.getParameter("id");
    String name = request.getParameter("name");
    String qname = request.getParameter("qname");
    String cost = request.getParameter("cost");

    String subjectXML = createEmployeeXML(id, name,cost, qname);        
    InstitutionNewJerseyClient client = new InstitutionNewJerseyClient();
    client.create_XML(subjectXML);
    client.close();

    RequestDispatcher disp =     request.getRequestDispatcher("/addSubjectOutcome.jsp");
    disp.forward(request, response);
    log("-------------------------------------------------------------- ----------------------------------------------------------------------------------------------" );
    log("employeeXMLog------- -" + subjectXML);

}



 private String createEmployeeXML(String id, String name,  String cost,String qname) {
    String subjectXML = "<subject>"
                            + "<id>" + id + "</id>"
                            + "<name>" + name + "</name>"
                            + "<cost>" + cost + "</cost>"
                            + "<qualifications>"
                                 + "<qualification>"
                                    + "<qname>" + qname + "</qname>"
                                    + "<code>" + name + "</code>"
                                 + "</qualification>"
                                + "</qualifications>"
                      + "</subject>";
                    return subjectXML;
}
}