http://wiki.apache.org/myfaces/Working_With_DataTable_And_PreserveDataModel
On 3/7/06, Randy Simon <[EMAIL PROTECTED]> wrote:
I'm sure I am doing something wrong, but I can't figure out what it is. I
have the following:
<h:form>
<h:commandButton action=""> value="New Property" />
<p></p>
<t:dataTable value="#{dataSourceEditor.dataModel}"
preserveDataModel="true"
var="property" border="1">
<h:column>
<h:inputText value="#{property.name}" />
</h:column>
<h:column>
<h:outputText value="#{ property.type}" />
<h:inputHidden value="#{property.type}" />
</h:column>
</t:dataTable>
</h:form>
My dataSourceEditor bean is in request scope and has the following methods.
public DataModel getDataModel() {
if (dataModel == null) {
dataModel = new ListDataModel();
}
dataModel.setWrappedData(properties);
return dataModel;
}
public void setDataModel(DataModel dm) {
dataModel = dm;
}
public String newProperty() {
DSProperty property = new DSProperty();
property.setName ("new property");
property.setType(Property.LONG);
if (dataModel != null) {
properties = (List) dataModel.getWrappedData();
}
if (properties == null) {
properties = new ArrayList();
}
properties.add(property);
return null;
}
When I click the "new property" button I would expect my "setDataModel"
method to be called then the "newProperty" method to be called where I add a
new property to the list. However, when I click on the "new property"
button I get the following class cast exception.
java.lang.ClassCastException: javax.faces.model.ListDataModel
at
org.apache.myfaces.component.html.ext.HtmlDataTable.updateModelFromPreservedDataModel(HtmlDataTable.java:254)
at
org.apache.myfaces.component.html.ext.HtmlDataTable.processUpdates (HtmlDataTable.java:240)
at javax.faces.component.UIForm.processUpdates(UIForm.java:196)
at
javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:927)
at javax.faces.component.UIViewRoot.processUpdates (UIViewRoot.java:363)
at
com.sun.faces.lifecycle.UpdateModelValuesPhase.execute(UpdateModelValuesPhase.java:81)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)
at
weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run (StubSecurityHelper.java:225)
at
weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:127)
at
weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java :272)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at
weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at
org.apache.beehive.netui.pageflow.PageFlowPageFilter.runPage (PageFlowPageFilter.java:299)
at
org.apache.beehive.netui.pageflow.PageFlowPageFilter.doFilter(PageFlowPageFilter.java:214)
at
weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java :42)
at
org.apache.shale.faces.ShaleApplicationFilter.doFilter(ShaleApplicationFilter.java:285)
at
weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at
com.bea.p13n.servlets.PortalServletFilter.doFilter (PortalServletFilter.java:329)
at
weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at
weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java :3192)
at
weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at
weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at
weblogic.servlet.internal.WebAppServletContext.securedExecute (WebAppServletContext.java:1984)
at
weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1891)
at
weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java :1318)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)
I am completely stumped about why this happens. Thanks in advance for your
help.
Randy
