filteration and command button

[vijayprimefaces]

Hello,

I have a datatable which has filters on all columns. It also has pagination. Outside datatable I have a command button which saves the selected row (from the datatable) to the db. Problems are
1. Command button functionality does not work if filters are present.
It throws a NPE (as seen below) everything works fine if I remove filters.
java.lang.NullPointerException
at org.primefaces.component.datatable.DataHelper.decodeFilters(DataHelper.java:182)
at org.primefaces.component.datatable.DataTableRenderer.decode(DataTableRenderer.java:47)
at javax.faces.component.UIComponentBase.decode(UIComponentBase.java:787)
at javax.faces.component.UIData.processDecodes(UIData.java:1162)
at org.primefaces.component.datatable.DataTable.processDecodes(DataTable.java:595)
2. SortBy does not work.

Here is the code of the xhtml file

Code: Select all

<p:dataTable value="#{myController.allUnRegisteredStudent}" 
                                selection="#{registeredStudentController.selectedStudent}" 
                                rowSelectListener="#{registeredStudentController.studentSelectListener}"
                                rowUnselectListener="#{registeredStudentController.studentUnSelectListener}"
                                selectionMode="multiple"
                                dblClickSelect="false"
                                var="item1"
                                id="tbl1"
                                paginator="true" 
                                rows="5"
                                paginatorTemplate="{CurrentPageReport}  {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}"
                                rowsPerPageTemplate="5,10,15"
                                >
                                
                        <f:facet name="header">  
                            <font color="white">Students  </font>
                        </f:facet> 
                        <p:column headerText="Last Name"
                                  sortBy="#{item1.lastName}"
                                  filterBy="#{item1.lastName}"  
                                  filterMatchMode="exact"
                                  filterStyle="float:left"
                                  style="width:10%">
                            <h:outputText value="#{item1.lastName}"/>
                        </p:column>
                        <p:column headerText="First Name"
                                  sortBy="#{item1.firstName}"
                                  filterBy="#{item1.firstName}"  
                                  filterStyle="float:left">
                            <h:outputText value="#{item1.firstName}"/>
                        </p:column>
                        <p:column headerText="course"
                                  sortBy="#{item1.course.name}"
                                  filterBy="#{item1.course.name}"  
                                  filterOptions="#{registeredStudentController.courseFilterOptions}"
                                  filterStyle="float:left">
                            <h:outputText value="#{item1.department.name}"/>
                        </p:column>
                    </p:dataTable>
                    <p:commandButton value="Save" 
                            action="#{myController.saveStudent}"
                            image="icon icon-edit"
                            immediate="true"
                            ajax="false"
                            styleClass="icon-button"/>