Question

我想知道为什么我在bean方法中得到空指针。在我的前端，我正在关注价值adp.domain.elementsDomain，因为标签正在屏幕上正确显示。这是我的前线：

<c:forEach items="#{atributosDaPesquisaBean.atributosDaPesquisaList}" var="adp" varStatus="loop">
    <h:panelGrid columns="2" cellpadding="20">
        <h:outputText  value="#{adp.dominio.nome}"/>    
        <p:selectManyCheckbox id="gridQueryResult" layout="grid" columns="2"> 
            <f:selectItems value="#{adp.dominio.elementosDominio}" var="elemento" itemLabel="#{elemento.label}" itemValue="#{elemento}" />
            <f:ajax listener="#{atributosDaPesquisaBean.incluiNaPesquisa(elemento)}"/>
        </p:selectManyCheckbox> 
     </h:panelGrid>
</c:forEach>

这是我的豆子：

@ManagedBean
@SessionScoped
public class AtributosDaPesquisaBean {

private List<AtributosDaPesquisa> atributosDaPesquisaList;

@PostConstruct
    public void init() {
        AtributosDaPesquisaDAO adpDao = new AtributosDaPesquisaDAO();
        atributosDaPesquisaList = adpDao.buscaPorRelatorio(relatorio.getCodigo());
        atributosDaPesquisaList.forEach(adp -> adp.setaClausulaDeData());
        for(AtributosDaPesquisa adp: atributosDaPesquisaList){
            if(adp.isEhDominio()){
                List<ElementoDominio> elementosDominio = adp.getDominio().getElementosDominio();
                elementosDominio.forEach(elemento -> elemento.setEstaNaPesquisa(false));
            }
        }
   }

   public void incluiNaPesquisa(ElementoDominio elemento){
     //here elemento comes as null. Why?
    elemento.setEstaNaPesquisa(true);
   }

}

这些是我的模特：

@Entity
@Table(name = "tbl_atributosdapesquisa")
public class AtributosDaPesquisa {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "atr_codigo")
private Long codigo;

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "tbl_dominio_dom_codigo", referencedColumnName = "dom_codigo")   
private Dominio dominio;

//others columns

//getters and setters

}

其他型号：

@Entity
@Table(name = "tbl_dominio")
public class Dominio {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "dom_codigo")
private Long codigo;

@Column(name="dom_nome", nullable = false)
private String nome;

@OneToMany(fetch = FetchType.EAGER, mappedBy = "dominio")
private List<ElementoDominio> elementosDominio;

//getters and setters

}

最后：

@Entity
@Table(name = "tbl_elemento_dominio")
public class ElementoDominio {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "ele_dom_codigo")
private Long codigo; 


@Column(name="ele_dom_label", nullable = false)
private String label;

@Column(name="ele_dom_esta_na_pesquisa", nullable = false)
private boolean estaNaPesquisa;

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "dom_codigo", nullable = false)
private Dominio dominio;

//getters and setters
}

在我的方法'incluiNaPesquisa'中，它以null为参数。我不知道自我的屏幕渲染列表并显示每个标签以来的原因。如果我发送AtributoDaPesquisa作为参数，我没有收到空指针，而是对象。

支持bean中persistentBag中的空指针

0 个答案: