Eclipselink使用Eclipselink尝试在父表中插入，

Question

private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "idcondominio")
private Integer idcondominio;
@Basic(optional = false)
@Column(name = "nomecond")
private String nomecond;
@Column(name = "cnpjcond")
private Integer cnpjcond;
@OneToMany(mappedBy = "condominio")
private Collection<Bloco> blocoCollection;

布洛科

private static final long serialVersionUID = 1L;
@EmbeddedId
protected BlocoPK blocoPK;
@Basic(optional = false)
@Column(name = "nomebloco")
private String nomebloco;
@Column(name = "numero")
private String numero;
@JoinColumn(name = "condominio_idcondominio", referencedColumnName = "idcondominio", insertable = false, updatable = false)
@ManyToOne(optional = false)
private Condominio condominio;

=================================创建方法

public void create(Bloco bloco) throws PreexistingEntityException, Exception {
    if (bloco.getBlocoPK() == null) {
        bloco.setBlocoPK(new BlocoPK());
    }
    bloco.getBlocoPK().setCondominioIdcondominio(bloco.getCondominio().getIdcondominio());
    EntityManager em = null;
    try {
        em = getEntityManager();
        em.getTransaction().begin();
        Condominio condominio = bloco.getCondominio();
        if (condominio != null) {
            condominio = em.getReference(condominio.getClass(), condominio.getIdcondominio());
            bloco.setCondominio(condominio);
        }
        em.persist(bloco);
        if (condominio != null) {
            condominio.getBlocoCollection().add(bloco);
            condominio = em.merge(condominio);
        }
        em.getTransaction().commit();
    } catch (Exception ex) {
        if (findBloco(bloco.getBlocoPK()) != null) {
            throw new PreexistingEntityException("Bloco " + bloco + " already exists.", ex);
        }
        throw ex;
    } finally {
        if (em != null) {
            em.close();
        }
    }
}

============================控制器方法

@RequestMapping(value = "cadbloco", method = RequestMethod.POST)
public String cadbloco(@ModelAttribute(value = "Bloco") Bloco bloco, @RequestParam("condid") int idcond ) throws Exception {

    BlocoJpaController jpa = new BlocoJpaController();
    Condominio c = new Condominio();
    c.setIdcondominio(idcond);
    jpa.create(bloco);

    return ("redirect:bloco.htm");

}

例外

NestedServletException：请求处理失败；嵌套异常是javax.Persistence.rollbackException:exception[EclipseLink-4002]（Eclipse Persistence.Services-2.5.v20140319-9AD6ABD):org.Eclipse.Persistence.exceptions.databaseException内部异常：com.mysql.jdbc.exceptions.jdbc4.mysqlIntegrityConstraintViolationException：Column'nomecond'不能为空错误代码：1048调用：插入到condominio（bind=>[2 parameters bound]查询：InsertObjectQuery（entity.condominio[idcondominio=null])org.springframework.web.servlet.frameworkservlet.processRequest（frameworkservlet.java:973)org.springframework.web.servlet.frameworkservlet.dopost（.wsfilter.doFilter(wsfilter.java:52)org.netbeans.modules.web.monitor.server.monitorfilter.doFilter(monitorfilter.java:393)

Answer 1

异常表示“nomeCond”值为null。因此，如果在控制器中添加这样的代码：

C.setnomeCond（“一些值”）；

这应该能解决问题。，