datatable row remains selected/highlighted where selectionMode="single" - jsf

Question

I've been running Primefaces 3.0, no issues, and now am trying an upgrade to 3.4.x - I've tried 3.4, 3.4.1, and 3.4.2 and this problem occurs in all 3 - basically for the datatable with the selectionMode="single" option when I click on a row it remains selected no matter how many other rows I select. At the same time I'm quite sure the selection="#{databrowser.selectedData}" variable is not being set when I'm clicking on the rows. The table is fully populated and no 2 rows have the exact same data in all columns. Tested and this occurs in both Chrome and Firefox. I can't find any similar problem posted - wondering if anyone else has had this issue?
Apart from the element referencing this is the 3.0 code I've used:
<p:layoutUnit position="center" resizable="true" header="Data Set Details" styleClass="east_panel_header" >
<h:form id="tblbrowser">
<p:dataTable id="dataTable" emptyMessage="No data sets found." style="width: 100%" var="datlis" resizableColumns="true" value="#{databrowser.selectedDataModel}" widgetVar="dataTable" selection="#{databrowser.selectedData}" selectionMode="single" >
<p:ajax event="rowSelect" update=":usercomments:commentsTable, :tblbrowser:dataTable" />
<f:facet name="header" >
<p:outputPanel>
<h:outputText value="Search all fields " />
<p:inputText id="globalFilter" onkeyup="dataTable.filter()"/>
</p:outputPanel>
</f:facet>
<p:column id="owner" filterBy="#{datlis.uname}" headerText="Added By" filterMatchMode="contains" >
<h:outputText value="#{datlis.uname}" />
</p:column>
<p:column id="name" filterBy="#{datlis.name}" headerText="Name" >
<h:outputText value="#{datlis.name}" />
</p:column>
<p:column id="description" filterBy="#{datlis.description}" headerText="Description" filterMatchMode="endsWith" >
<h:outputText value="#{datlis.description}" />
</p:column>
<p:column id="datatype" filterBy="#{datlis.data_type}" headerText="Data Type"
filterOptions="#{databrowser.dataTypeOptions}" filterMatchMode="exact" >
<h:outputText value="#{datlis.data_type}" />
</p:column>
<p:column id="quality" filterBy="#{datlis.quality}" headerText="Source Type"
filterOptions="#{databrowser.qualityOptions}" filterMatchMode="exact" >
<h:outputText value="#{datlis.quality}" />
</p:column>
<p:column id="added" headerText="Date Added" filterMatchMode="endsWith" >
<h:outputText value="#{datlis.added}" />
</p:column>
<p:column headerText="Metadata" style="width:40px" >
<p:commandButton id="selectButton" rendered="#{datlis.has_metadata}" icon="ui-icon-circle-arrow-s" title="View" ajax="false" >
<f:param name="filepath" value="#{datlis.filepath}" />
<p:fileDownload value="#{filedownloader.mfile}" />
</p:commandButton>
</p:column>
<p:column headerText="Data File(s)" style="width:90px" >
<p:commandButton id="selectButton2" rendered="#{datlis.has_datafiles}" icon="ui-icon-circle-arrow-s" title="View" ajax="false" >
<f:param name="datafiles" value="#{datlis.datafiles}" />
<p:fileDownload value="#{filedownloader2.dfile}" />
</p:commandButton>
<h:outputText value=" " />
<h:outputText value="#{datlis.zipsize}" />
</p:column>
</p:dataTable>
</h:form>
</p:layoutUnit>

Answer 1

You are missing the rowKey attribute which should be the unique identifier of each row.
Example, if your selectedData object has a unique field id, your dataTable component should look like:
<p:dataTable id="dataTable" rowKey=#{datlis.id}
value="#{databrowser.selectedDataModel}" var="datlis"
selection="#{databrowser.selectedData}" selectionMode="single" >
No need to update the same table within p:ajax to see the selection, so you can probably remove the :tblbrowser:dataTable from the update target and have only:
<p:ajax event="rowSelect" update=":usercomments:commentsTable" />