ype异常报告

Question

我遇到了以下问题：

每次我尝试创建一个bloco，eclipselink尝试插入一个condominio记录（应该为null），当我在一个简单的java项目中运行相同的代码（没有spring）它工作正常，但在web项目中它一直试图插入＆＃34;父母＆＃34;表

为什么eclipselink试图强制建立双向关系？

实体

Condominio

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;

Bloco

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");

}

=====================

ype异常报告

消息请求处理失败;嵌套异常是javax.persistence.RollbackException：Exception [EclipseLink-4002]（Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd）：org.eclipse.persistence.exceptions.DatabaseException

说明服务器遇到内部错误，导致无法完成此请求。

例外

org.springframework.web.util.NestedServletException：请求处理失败;嵌套异常是javax.persistence.RollbackException：Exception [EclipseLink-4002]（Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd）：org.eclipse.persistence.exceptions.DatabaseException 内部异常：com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException：Column＆＃39; nomecond＆＃39;不能为空错误代码：1048 调用：INSERT INTO condominio（cnpjcond，nomecond）VALUES（？，？） bind =＆gt; [2个参数绑定] 查询：InsertObjectQuery（Entity.Condominio [idcondominio = null]） org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:973） org.springframework.web.servlet.FrameworkServlet.doPost（FrameworkServlet.java:863） javax.servlet.http.HttpServlet.service（HttpServlet.java:648） org.springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:837） javax.servlet.http.HttpServlet.service（HttpServlet.java:729） org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52） org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter（MonitorFilter.java:393）

Answer 1

异常说“nomecond”值为null。所以在你的控制器中如果你添加了代码

c.setNomeCond（“Some value”）;

这应解决问题。

Answer 2

这是阙右方法，我没有在bloco中设置condominio，所以当我试图创建一个新的bloco它没有condominio。

我对这种事情不熟悉，有时会犯这样的错误，但感谢你的帮助。

=============================================== ===================

@RequestMapping（value =＆＃34; cadbloco＆＃34;，method = RequestMethod.POST） public String cadbloco（@ModelAttribute（value =＆＃34; Bloco＆＃34;）Bloco bloco，@ RequestParam（＆＃34; condid＆＃34;）int idcond）抛出异常{

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

    return ("redirect:bloco.htm");

}

带有eclipselink的Eclipselink尝试在父表

ype异常报告

2 个答案: