Primefaces Datatable row selection inside dialog - jsf

Question

I am sorry for my English. I have a JBoss Seam Project and using primefaces in user interface.We have a dialog and inside a datatable. When i select a row im getting following error
ERROR [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (http-localhost-127.0.0.1-8080-1) javax.resource.ResourceException: IJ000460: Error checking for a transaction
PersistenceException org.hibernate.exception.GenericJDBCException: Could not open connection
I thought maybe this error about hibernate but When i tired a lot of way about this problem i couldnt done it But when i moved dialog to new xhtml page it was done.I want to use dialog for my project instead of new page.Where is my mistake following code?
<h:form id="vehicleForm">
<p:commandButton id="selectClientButton" value="Musteri Sec" actionListener="#{clientFacade.clientSearchClear()}" />
</h:form>
<h:form id="selectClientForm">
<p:dialog widgetVar="selectClientDialog" resizable="true" draggable="true" modal="true" header="Arac Satis">
<h:panelGrid columns="4">
<h:outputText value="Adi" />
<h:outputText value="Soy Adı" />
<h:outputText value="TC/Vergi No." />
<h:outputText value="" />
<p:inputText value="#{clientFacade.client.name}" />
<p:inputText value="#{clientFacade.client.lastName}" />
<p:inputText value="#{clientFacade.client.taxNo}" />
<p:commandButton value="ARA" update=":selectClientForm:clientListDT" />
</h:panelGrid>
<p:dataTable id="clientListDT" rows="10" value="#{clientFacade.clientList}" var="client" >
<p:column style="width:3%" >
<p:commandLink id="test" actionListener="#{vehicleStockFacade.selectClient(client.clientId)}" ajax="false" >
<h:graphicImage value="#{icon.icon_select_mine_small}" rendered="#{client.isMyClient}" title="#{msg.choose}" width="15" height="15"/>
<h:graphicImage value="#{icon.icon_select_not_mine_small}" rendered="#{!client.isMyClient}" width="15" height="15" />
</p:commandLink>
</p:column>
<p:column>
<f:facet name="header" >
<h:outputText value="#{msg.client_name}" />
</f:facet>
<h:outputText value="#{client.name}" />
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="#{msg.client_lastname}" />
</f:facet>
<h:outputText value="#{client.lastName}" />
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="#{msg.tax_no}" />
</f:facet>
<h:outputText value="#{client.taxNo}" />
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="#{msg.cell_phone}" />
</f:facet>
<h:outputText value="#{clientFacade.useMaskForPhone(client.mobilePhone)}" />
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="#{msg.town}" />
</f:facet>
<h:outputText value="#{client.town}" />
</p:column>
<p:column>
<f:facet name="header" id="headerId" >
<h:outputText value="#{msg.address}" />
</f:facet>
<h:outputText value="#{client.addressLine1}" />
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="#{msg.post_code}" />
</f:facet>
<h:outputText value="#{client.postCode}" />
</p:column>
</p:dataTable>
<f:facet name="footer">
<p:commandButton value="Secimi Kaldir" action="#{vehicleStockFacade.removeClientFromVehicleStock()}" style="float:right;margin-bottom:5px" ajax="false" />
</f:facet>
</p:dialog>
</h:form>