Question

我使用的是primefaces 3.3.1，mojarra 2.1.3，netbeans 7.0.1。

<p:dataTable id="approvalchainstable" var="department" value="#{viewApprovalChain.wfdepartments}">
   <p:columnGroup type="header">  
       <p:row>
          <p:column colspan="4" headerText="#{bundle.DepartmentNameFieldLabel}" />  
       </p:row>
       <p:row>  
          <p:column headerText="#{bundle.PostNameFieldLabel}"/>  
          <p:column headerText="#{bundle.ItemCountLabel} #{bundle.ApprovalLevelNameFieldLabel}"/>
          <p:column headerText="#{bundle.ViewLabel}"/>  
          <p:column headerText="#{bundle.LabelDelete}"/>    
       </p:row>  
   </p:columnGroup>  
   <p:subTable var="approvalchain" value="#{department.wfApprovalchainCollection}">  
       <f:facet name="header">  
          #{department.wfDepartmentName}   
       </f:facet>  
       <p:column>  
          #{approvalchain.idWfPost.wfPostName}  
       </p:column> 
       <p:column>  
          #{approvalchain.wfApprovalchainLevel}  
       </p:column> 
       <p:column>  
          <h:link outcome="/viewApprovalChainDetails" value="#{bundle.ViewLabel}">
            <f:param name="idWfApprovalChain" value="#{approvalchain.idWfApprovalchain}"/>
          </h:link>
       </p:column> 
       <p:column>  
          <p:commandButton value="#{bundle.LabelDelete}" 
                           title="Delete"
                           icon="ui-icon-trash"
                           action="#{viewApprovalChain.removeOneApprovalchain(approvalchain)}">
          </p:commandButton>
       </p:column> 
   </p:subTable>     
</p:dataTable>

这里是ViewScoped托管bean方法 - ＆gt;从上面的动作调用传递的参数在托管bean中解析为null。因此我收到了NullPointerException错误。

    public String removeOneApprovalchain(WfApprovalchain wfapprovalchaintoremove) {
    try {
        LogController.log.info("Removing approval chain flow for application " +
                wfapprovalchaintoremove.getIdWfApplication().getWfApplicationName() +
                " applicable for " + wfapprovalchaintoremove.getIdWfPost().getWfPostName() +
                " in " + wfapprovalchaintoremove.getIdWfDepartment().getWfDepartmentName());
        wfApprovalchainFacade.remove(wfapprovalchaintoremove);
        LogController.log.info("Reloading department names for the select one box");
        wfdepartments = wfDepartmentFacade.selectAll();            
    } catch (Exception ex) {
        LogController.log.fatal(ex.toString());
    } finally {
        return null;
    }
}

我很自信我做得对。但是为什么wfapprovalchaintoremove对象参数总是解析为null？为什么参数未在primefaces子表中正确传递？我尝试了没有子表的数据表内部，它正常工作。请帮助，非常感谢您的帮助。

Answer 1

你做的是好的，它应该工作，我做了一个测试，参数从p:subtable正确传递。也许你的p:dataTable建筑有问题吗？

对象未正确传递给托管bean - 对于primefaces子表中的commandButton动作参数

1 个答案: