小编cri*_*ank的帖子

我开始在JPA 2.1中使用新的实体图形功能来指定必须加载的Lazy集合.考虑以下课程:

@Entity
@NamedQueries({
    @NamedQuery(name="findWithFilterAttr","select a from A a where a.filterAttribute like :filter")
})
@NamedEntityGraphs({
@NamedEntityGraph(name = "graph.childs", attributeNodes = @NamedAttributeNode("childs"))})
public class A{
  @Id
  private long id;
  @OneToMany(mappedBy="parent")
  private List<B> childs;
  private String filterAttribute;
}
@Entity
public class B{ 
  @Id
  private long id;
  @ManyToOne
  private A parent;
}

当我执行命名查询以获取具有实体图形提示的A实体列表时,我得到一个带有重复A实体的集合.如何只加载A实体一次.

我正在使用:

• Hibernate 4.3.5
• Wildfly 8.1

我正在使用primefaces 3.4.1而我正在尝试在子表中使用带有ajax调用的SelectOneRadio, 但它不起作用,不调用ajax监听器

<p:dataTable id="competenciesTable" var="competency" value="#{evaluationControl.currentEvaluation.evaluatedCompetencies}">
                <f:facet name="header">
                    <h:outputText value="#{gchmsg['global.competencies']}" />
                </f:facet>
                <p:subTable id="descriptorsTable" var="descriptor" value="#{competency.evaluationDescriptors}">
                    <f:facet name="header">
                        <h:outputText class="strong" value="#{competency.competency.name}" />
                    </f:facet>
                    <p:column>#{descriptor.descriptor.description}</p:column>
                    <p:column>
                        <p:selectOneRadio required="true" styleClass="calification_scale" id="descriptorCalification" value="#{descriptor.calification}" converter="calification">  
                            <f:selectItems value="#{competency.competency.calificationSchema.scales}" var="scale" itemLabel="#{scale.qualitativeValue}" itemDescription="#{scale.description}" itemValue="#{scale}" />
                            <p:ajax process="@this" listener="#{evaluationControl.handleRadioChange}" update=":evaluationForm:finalResultText, descriptorCalificationMsg" />
                        </p:selectOneRadio> 
                        <p:message id="descriptorCalificationMsg" for="descriptorCalification" display="icon" />
                    </p:column>
                </p:subTable>
            </p:dataTable>

evaluateControl是一个SessionBean,方法是

public void handleRadioChange() {
    log.debug("Listener called");
}

感谢帮助.