p:datatable with selectionMode as multiple

Question

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>

Error

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:]

@NikitaBeloglazov Yes then i get a different error since it is not array. As per the document i need to give array for selection. — Coool Awesome

BalusC BalusC · Accepted Answer · 2012-08-06T11:17:24

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;

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

p:datatable with selectionMode as multiple

Error

1 Answers