Question

尝试获取对象值时发生异常。它之前我们的应用程序只有web应用程序，但当我们将带有APP-INF / lib的ejb包添加到application.xml异常时出现：javax.el.PropertyNotFoundException：类'java.lang.String'没有拥有属性'类型'。在我的调查中：item值是String，但不是getItems方法返回的对象。为什么会出现此异常。

感谢任何想法。

以下是jsp页面的代码。

<div id="report_items">
<c:forEach items="#{repcatTree.items}" var="item">
   <div style="padding-top:7px; padding-bottom:7px; padding-right:15px;">
      <span class="report_item_category_class">
         <h:commandLink rendered="#{item.type == 'category'}" action="#{item.onNodeClicked}" 
               styleClass="default_link">
            <h:graphicImage url="/views/tree/images/folder_big.gif" />
            <h:outputText value="#{item.attributes.FILE_NAME}" style="font-size:14px; font-weight:bold; padding-left:5px" />
         </h:commandLink>
         <h:commandLink rendered="#{item.type == 'report'}" styleClass="default_link" 
                    action="action_report_run" title="#{item.cells['report_name'].toolTip}">
            <h:graphicImage url="/icon?rdd_path=#{item.attributes.RDD_PATH}" />               
            <h:outputText value="#{item.cells['report_name'].display}"
                             style="font-size:14px; font-weight:bold; padding-left:5px" />

            <f:param name="nodePath" value="#{item.attributes.RDD_PATH}" />
            <f:param name="nodePrettyPath" value="#{item.attributes.CAT_PATH}" />
          </h:commandLink>
      </span>
   </div>
</c:forEach>
</div>

这是我的班级。我删除了不需要的部分代码。

public class RepcatTreeModel extends TreeModel implements Serializable {

   public RepcatTreeModel() {
      super();
   }

   public Collection getItems() {
       items = new ArrayList();
       items.addAll(getActiveNode().getChildren());
       items.addAll(getTableModel().getRows());
       Object[] _items = items.toArray();
       Arrays.sort(_items, new Comparator() {
           public int compare(Object o1, Object o2) {
               int result = 0;
               if (o1 instanceof TreeNodeModel && o2 instanceof TreeNodeModel) {
                   TreeNodeModel nodeA = (TreeNodeModel)o1;
                   TreeNodeModel nodeB = (TreeNodeModel)o2;
                   String strA = (String)nodeA.getAttributes().get(RepcatTreeModel.ATTR_NAME);
                   String strB = (String)nodeB.getAttributes().get(RepcatTreeModel.ATTR_NAME);

                   if (strB.compareToIgnoreCase(strA) < 0)
                       result = 1;
                   else
                       if (strB.compareToIgnoreCase(strA) > 0)
                           result = -1;
               }
               else
                   if (o1 instanceof RowModel && o2 instanceof RowModel) {
                       RowModel nodeA = (RowModel)o1;
                       RowModel nodeB = (RowModel)o2;
                       String strTmp = (String)nodeA.getAttributes().get(RepcatTreeModel.ROW_ATTR_RDD_PATH);
                       String strA = strTmp.substring(strTmp.lastIndexOf('/')+1);
                       strTmp = (String)nodeB.getAttributes().get(RepcatTreeModel.ROW_ATTR_RDD_PATH);
                       String strB = strTmp.substring(strTmp.lastIndexOf('/')+1);

                       if (strB.compareToIgnoreCase(strA) < 0)
                           result = 1;
                       else
                           if (strB.compareToIgnoreCase(strA) > 0)
                               result = -1;
                   }
               return result;
          }
       });
       items = new ArrayList(Arrays.asList(_items));
       return items;
   }

}

Answer 1

RepcatTree.getItems()返回字符串而不是您的类型的对象。这就是为什么你不能在项目上调用getType()的原因。

Answer 2

#{repcatTree.items}返回一个String对象列表。

在两个<h:commandLink>组件上，从

更改其rendered属性

rendered="#{item.type == 'category'}"

到

rendered="#{item eq 'category'}"

异常类'java.lang.String'没有属性'type'

2 个答案: