DataModel must implement org.primefaces.model.SelectableDataModel when selection is enabled.
facelets, jsf, primefaces
Solution
just add this attribute rowKey to the datatable tag :
<p:dataTable border="1" value="#{projectAdminisrationMB.projectNoUsersList}"
var="userObj"
rowKey="#{userObj.name}"selection="#{projectAdminisrationMB.selectedUsers}"
selectionMode="multiple" rowIndexVar="rowIndex"
binding="#{table2}">
Problem
I'm trying to create a DataTable with Multiple Row Selection but i'm getting an error here's the link of the tutorial http://www.primefaces.org/showcase/ui/datatableRowSelectionMultiple.jsf : Here's my xhtml: ``` <p:dataTable border="1" value="#{projectAdminisrationMB.projectNoUsersList}" var="userObj" selection="# {projectAdminisrationMB.selectedUsers}" selectionMode="multiple" rowIndexVar="rowIndex"binding="#{table2}"> <p:column id="column3"> <f:facet name="header"> <h:outputText value=" user "></h:outputText> </f:facet> <h:outputText value="#{userObj.name}"/> / <h:outputText value="#{userObj.lastName}"></h:outputText> <h:outputText value="#{userObj.firstName}"></h:outputText> </p:column> <f:facet name="footer"> <p:commandButton id="addProjectUser" value=" Add " onclick="dlg1.show()" /> <p:commandButton id="deleteProjectUser" value=" Delete " /> </f:facet> </p:dataTable> ``` Managed Bean : ``` @ManagedBean @SessionScoped public class ProjectAdminisrationMB implements Serializable { private static final long serialVersionUID = 1L; private String projectName; private List <User> projectUsersList; private List<User> projectNoUsersList; private List<User> selectedUsers; private String projectAdmin; public ProjectAdminisrationMB() { super(); AdministrationProjectFinal administrationProjectFinal =new AdministrationProjectFinal(); this.projectUsersList=administrationProjectFinal.getUserList(); this.projectNoUsersList=administrationProjectFinal.getNotUserList(); } public String getProjectName() { return projectName; } public void setProjectName(String projectName) { this.projectName = projectName; } public List<User> getProjectUsersList() { return projectUsersList; } public void setProjectUsersList(List<User> projectUsersList) { this.projectUsersList = projectUsersList; } public String getProjectAdmin() { return projectAdmin; } public void setProjectAdmin(String projectAdmin) { this.projectAdmin = projectAdmin; } public List<User> getProjectNoUsersList() { return projectNoUsersList; } public void setProjectNoUsersList(List<User> projectNoUsersList) { this.projectNoUsersList = projectNoUsersList; } public List<User> getSelectedUsers() { return selectedUsers; } public void setSelectedUsers(List<User> selectedUsers) { this.selectedUsers = selectedUsers; } } ``` i'm getting this error: ``` javax.faces.FacesException: DataModel must implement org.primefaces.model.SelectableDataModel when selection is enabled..... ```