问题描述：

根据素数文档，所选内容应为数组.在下面的代码中，bean.selectedUsers定义为"HasUsersVO [] selectedUsers"，但数据表的值为List.填充数据表后，单击确定"按钮时，我在底部粘贴了强制转换错误.

As per the primefaces document the selection should be a array. In the below code bean.selectedUsers is defined as "HasUsersVO[] selectedUsers" but the value of datatable is List. I am getting cast error as pasted at the bottom when i click the OK button after the datatable got filled.

                <p:dataTable id="userListTable" value="#{bean.peopleVOList}"
                    var="user" rowClasses="odd even" selection="#{bean.selectedUsers}" rowKey="#{user.userGuid}"
                    <p:column selectionMode="multiple" style="width:18px">
                    </p:column>
.....
.....
</p:dataTable>

错误

22:59:16,962 INFO  [class com.zreflect.emyed.managedbean.circle.CircleController] (http--127.0.0.1-8080-3) *******************Outside getUsersList********************
22:59:38,943 WARNING [javax.enterprise.resource.webcontainer.jsf.lifecycle] (http--127.0.0.1-8080-3) [Lcom.user.PeopleVO; cannot be cast to java.util.Collection: java.lang.ClassCastException: [Lcom.user.PeopleVO; cannot be cast to java.util.Collection
    at org.primefaces.component.datatable.DataTable.getRowData(DataTable.java:835) [primefaces-3.3.1.jar:]
    at org.primefaces.component.datatable.DataHelper.decodeMultipleSelection(DataHelper.java:262) [primefaces-3.3.1.jar:]
    at org.primefaces.component.datatable.DataHelper.decodeSelection(DataHelper.java:240) [primefaces-3.3.1.jar:]
    at org.primefaces.component.datatable.DataTableRenderer.decode(DataTableRenderer.java:72) [primefaces-3.3.1.jar:]

答

异常消息和堆栈跟踪指示您在#{bean.peopleVOList}之后提供了PeopleVO[]数组.这个不对.它必须是Collection，最好是ArrayList<PeopleVO>.

The exception message and the stacktrace indicates that you've supplied a PeopleVO[] array behind #{bean.peopleVOList}. This is not right. It must be a Collection, preferably an ArrayList<PeopleVO>.

private List<PeopleVO> peopleVOList;

#{bean.selectedUsers}实际上必须是PeopleVO[].那部分很好.

The #{bean.selectedUsers} must indeed be an PeopleVO[]. That part is fine.

p:selectionMode为倍数的数据表

错误

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