ClassCastException with t:datatable

Hi
I am using apache myfaces and trying to use its datatable with preserveDataModel=true attribute. I get the following exception when I click on a command link inside the datatable -
[Servlet Error]-[Faces Servlet]: java.lang.ClassCastException: javax.faces.model.ListDataModel incompatible with org.apache.myfaces.component.html.ext._SerializableDataModel
I do have the latest tomahawk-1.1.3.jar which is supposed to have one fix mentioned on tihs issue.
Reading the doc on JSF datatable it seems like the datamodel is not serializable for pure JSF. So how do I get the datamodel to be a subclass of what myfaces is looking for?
Any pointers wold be very helpful.
Thanks

Well here is a code snippet that works fine:
extract of JSP-page:
=============
<h:dataTable value="#{usrctrl.userList}" var="user" rowClasses="odd, even"
             styleClass="datatable" align="center">
    <h:column>
        <f:facet name="header">
            <h:outputText value="#{msg['name.first']}" />
        </f:facet>
        <h:outputText value="#{user.firstName}" />
    </h:column>
</h:datatable>source of usrctrl:
===========
    public java.util.List<User> getUserList () {
        java.util.List<User> users = new ArrayList ();
        users.addAll (userControl.getUsers ()); // get data from backeind
        return users
...interface of userControl:
================
    public java.util.List<User> getUsers () {Class user has to implement a method named public String getFirstName().
Hope that gets you further.
Regards Mark

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Rather use a Collection of DTO's. See http://balusc.xs4all.nl/srv/dev-jep-dat.html for some insights. There is also a section "Nesting datatables".

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Hi,
I am defining custom module classloader hierarchy to avoid redeploying of the
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Rob Woollen <[email protected]> wrote:
>
>
Nasrin Azordegan wrote:
Rob,
if I remove my classloader structure from weblogic-application.xml,I get an
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entity beans are located in dml.jar. The data access layer which consistof 200
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only data access layer, the dal.jar, not the entity beans. This explainswhy you
see dml.jar in a classloader with a child classloader that loads dal.jar.
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methods and then I get a ClassCastException.
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without touching anything in the parent loader. However, it also means
that you've isolated it's classes and other modules can't see them.
-- Rob
thanks,
Nasrin
in test method
in test2 method
in test3 method
in test4 method
in test5 method
in test6 method
<Apr 12, 2004 9:26:03 AM PDT> <Warning> <EJB> <BEA-010096> <The Message-Driven
EJB: SimTimeListener is unable to connect
to the JMS destination: cn=t.cms.cts.simTimeInfo. Connection failedafter 184
attempts. The MDB will attempt to reconne
ct every 10 seconds. This log message will repeat every 600 secondsuntil the
condition clears.>
<Apr 12, 2004 9:26:03 AM PDT> <Warning> <EJB> <BEA-010061> <The Message-Driven
EJB: SimTimeListener is unable to connect
to the JMS destination: cn=t.cms.cts.simTimeInfo. The Error was:
[EJB:011011]The Message-Driven EJB attempted to connect to the JMSdestination
with the JNDI name: cn=t.cms.cts.simTimeI
nfo. However, the object with the JNDI name: cn=t.cms.cts.simTimeInfois not a
JMS destination, or the destination found
was of the wrong type (Topic or Queue).>
in test method
in test2 method
in test3 method
in test4 method
in test5 method
in test6 method
<Apr 12, 2004 9:28:26 AM PDT> <Warning> <RMI> <BEA-080003> <RuntimeExceptionthrown
by rmi server: com.trs.cv.infr.istr.
sc.sim.factory.ejb.ExerciseSessionFactory_zhotso_EOImpl.test7()
java.lang.ClassCastException.
java.lang.ClassCastException
at com.trs.cv.infr.istr.sc.sim.factory.ejb.ExerciseSessionFactory_zhotso_EOImpl_WLSkel.invoke(Unknown
Source)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:477)
at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef.java:108)
at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:420)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:353)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:144)
at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:415)
at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:30)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
Rob Woollen <[email protected]> wrote:
You'll have to give me some more information on the ClassCastException.
Where does it happen? Print out the classnames and the
classloaders of the 2 objects.
Does everything work fine if you remove your classloader-structure?
-- Rob
Nasrin Azordegan wrote:
Hi,
I am defining custom module classloader hierarchy to avoid redeployingof the
entire application mainly because we have so many EJBs and it takesa long time
to deploy the entire app. I deploy my app using the exploded directory,add a
new method to an EJB in my dal.jar, redeploy, run my unittest and
I
get ClassCastException.
I am using weblogic.Deployer utility to reploy my module using "-targetsdal.jar@accsserver"
argument. I even tried undeploying that module and redeploy again
with
no luck.
here is weblogic-application.xml definition of the custom class loader
<classloader-structure>
<module-ref>
     <module-uri>floghmi.war</module-uri>
     </module-ref>
<module-ref>
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     </module-ref>
<module-ref>
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<classloader-structure>
     <module-ref>
          <module-uri>dml.jar</module-uri>
     </module-ref>
<classloader-structure>
     <module-ref>
     <module-uri>dal.jar</module-uri>
</module-ref>
</classloader-structure>
</classloader-structure>
</classloader-structure>
thanks,
Nasrin

Problem with a datatable and selectOneMenu

Hello
I'm pretty new at java, so this might be an easy problem to solve, but I've been stuck in this for a couple of days now, so any help will be appreciated.
I have a selectOneMenu item that when it's changed this value loads the info for a datatable below it, this works fine.... but I need that when for example, the select one menu has the value "1", the data tabla loads the activities for the option "1", inside the datatable there is a checkbox for a column, now, in this scenario, when I check 3 options in the datatable, I need to change the value in the selectOneMenu and put, for example the value "2", when this happens now I have to reload the datatable with the values corresponding to the activities for the option "2".
The problem is when I change the value of the selectOneMenu on the backingBean, because this selectOneMenu has implemented the onchange event, but this is only activated if the the value is changed in the UI, not in the code as I need to do it.
This are the lilbs that I'm using:
<%@ page contentType="text/html;charset=windows-1252"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<%@ taglib uri="http://myfaces.apache.org/tomahawk" prefix="t"%>
<%@ taglib uri="http://richfaces.org/a4j" prefix="a4j"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
This is the fragment of code of the selectOneMenu:
<h:selectOneMenu id="ddlTipoVisita" value="#{VisitaDomiciliarBean.idTipoVisita}" disabled="#{VisitaDomiciliarBean.modoEdicion == false}"
rendered="#{VisitaDomiciliarBean.mostrarSegunOpcionMenu}">
<f:selectItems value="#{VisitaDomiciliarBean.selectItemsTipoVisita}" />
<a4j:support status="statustablaSubtipoVisita" event="onchange" action="#{VisitaDomiciliarBean.cargarTablaSubtipoVisita}" reRender="tablaSubtipoVisita">
</a4j:support>
</h:selectOneMenu>
This is the datatable section:
<t:dataTable id="tablaSubtipoVisita" styleClass="scrollerTable2" headerClass="standardTable_Header"
footerClass="standardTable_Header" rowClasses="standardTable_Row1,standardTable_Row2"
columnClasses="columna_centrada" value="#{VisitaDomiciliarBean.subtiposVisita}" var="subtipo"
preserveDataModel="false" rows="10" >
<%--columna de seleccion multiple--%>
<t:column rendered="#{VisitaDomiciliarBean.seleccionMultiple == true}">
<f:facet name="header">
<h:outputText value="#{recursos['actividades.seleccionar']}" />
</f:facet>
<a4j:region>
<h:selectBooleanCheckbox
value="#{subtipo.seleccionado}" disabled="#{VisitaDomiciliarBean.modoEdicion == false}">
<a4j:support event="onchange" status="statustablaSubtipoVisita"
actionListener="#{VisitaDomiciliarBean.seleccionar}" reRender="ddlTipoVisita" >
</a4j:support>
</h:selectBooleanCheckbox>
</a4j:region>
</t:column>
<t:column>
<f:facet name="header">
<h:outputText value="#{recursos['actividades.descripcion']}"/>
</f:facet>
<h:outputText value="#{subtipo.descripcion}"></h:outputText>
</t:column>
</t:dataTable>
Is there any way to do this using the rendered option of the components? Or does anybody has another idea or recomendation?
I tried to solve it using two data tables, one for the option "2" and another for all the rest of the options, I tried to hide or show the one I need acoording to the data inside the array that has the info for the datatables, but this failed, because when I change the value for the selectOneMenu from the bean, both datatables are shown and not only the one that I need.
I would really appreciate any help with this!
Greetings,

Well turns out I had a some bad code in the back end that was resetting the model to the 'initial' value. I didn't require the FacesContext.getCurrentInstance().renderResponse(); after all.
But I still find it disturbing the model generator code being called twice.
If anyone has any suggestions on how to prevent this I'm all ears.

ClassCastException with ClassLoader issues

I'm using JBoss 3.2.3, with Kodo 3.1.0
After doing a hot deploy in JBoss, ClassCastExceptions start occuring.
String filter = "reference==param1";
Extent extent = pm.getExtent(Customer.class, false);
KodoQuery query = (KodoQuery) pm.newQuery(extent, filter);
Collection col = null;
try {
query.declareParameters("String param1");
col = (Collection) query.execute("x34c");
if (col.isEmpty())
return null;
Customer cust = (Customer) col.iterator().next();
finally {
if (query != null)
query.close(col);
At the line: Customer cust = (Customer) col.iterator().next();
a ClassCastException is thrown. The class loader for Customer.class point
to the deployed ear file, whilst the loader for
col.iterator().next().getClass() points to null.
Now, what is even more interesting is if I amend the above code slightly:
Extent extent = pm.getExtent(Customer.class, false);
KodoQuery query = (KodoQuery) pm.newQuery(extent);
Collection col = null;
try {
col = (Collection) query.execute();
if (col.isEmpty())
return null;
Customer cust = (Customer) col.iterator().next();
finally {
if (query != null)
query.close(col);
With the above, everything works fine. The only difference is that one
uses a filter to retrieve a particular object from the datastore, and the
other retrieves all objects from the datastore. I don't understand why it
throws a ClassCastException in one instance and not the other. Note that
this only happens after a hot deploy.
This problem only surfaced recently after I added a few more classes to be
persistent capable. After adding a further two classes, the
ClassCastException moved to another class.
Can anyone explain this?
Cheers

A N-
Did you make absolutely sure that you enhanced all of the new classes
and deployed them to correctly, and that you have clobbered any caches
JBoss may have to any of the old .ear files?
It might be the case that when you obtain the first in the list of all
the Customer instances, it doesn't have a relation to one of the new
classes, or its concrete instance is not one of the new classes, as
opposed to when you execute the filter.
If this doesn't help, can you provide us with some more information? At
a minimum, a complete stack trace is usually a prerequisite for being
able to diagnose problems like this.
In article <[email protected]>, A N wrote:
>
I'm using JBoss 3.2.3, with Kodo 3.1.0
After doing a hot deploy in JBoss, ClassCastExceptions start occuring.
String filter = "reference==param1";
Extent extent = pm.getExtent(Customer.class, false);
KodoQuery query = (KodoQuery) pm.newQuery(extent, filter);
Collection col = null;
try {
query.declareParameters("String param1");
col = (Collection) query.execute("x34c");
if (col.isEmpty())
return null;
Customer cust = (Customer) col.iterator().next();
finally {
if (query != null)
query.close(col);
At the line: Customer cust = (Customer) col.iterator().next();
a ClassCastException is thrown. The class loader for Customer.class point
to the deployed ear file, whilst the loader for
col.iterator().next().getClass() points to null.
Now, what is even more interesting is if I amend the above code slightly:
Extent extent = pm.getExtent(Customer.class, false);
KodoQuery query = (KodoQuery) pm.newQuery(extent);
Collection col = null;
try {
col = (Collection) query.execute();
if (col.isEmpty())
return null;
Customer cust = (Customer) col.iterator().next();
finally {
if (query != null)
query.close(col);
With the above, everything works fine. The only difference is that one
uses a filter to retrieve a particular object from the datastore, and the
other retrieves all objects from the datastore. I don't understand why it
throws a ClassCastException in one instance and not the other. Note that
this only happens after a hot deploy.
This problem only surfaced recently after I added a few more classes to be
persistent capable. After adding a further two classes, the
ClassCastException moved to another class.
Can anyone explain this?
Cheers
Marc Prud'hommeaux [email protected]
SolarMetric Inc. http://www.solarmetric.com

ClassCastException with Local Interfaces

Hi,
My environment is
WLS6.1SP3 (JDK131)
DB2 7.1
Windows 2000
I am trying to access an entity bean through it's local interface from a stateless session bean. I can see the jndi tree contains both remote and local names. I get the correct local home object from the lookup, howevere when I cast it to LocalHome, I get ClassCastException.
Any help would be greatly appreciated.
Thanks.
zahid

Thanks for your comments. In case of clustered
anvironment doesn't each node has it's own startup
script which could contain these local inerfaces ?Yes, it has , but again if you deploy ear to clustered environment everything will get propagated to participating nodes.
If you put jar with interfaces in classpath of each node you will have hard time to do hot deployment ( you can't ) and to keep things in sync.
>
I tried ear and it worked fine too.
However I still got the problem as it worked on
windows 2000 but doesn't work on aix where we want to
deploy it.if it is same setting as win box it shouldn't have problem

ClassCastException with PortableRemoteObject.narrow call

I want to call an ejb component located on a different machine and I can not get it to work. So I tried to deploy it under my version of jboss and try to invoke it. I was able to call it but when I added Context.PROVIDER_URL to my properties I get a classCastException.
String host = "jnp://localhost:1099";
props.setProperty(Context.PROVIDER_URL, host);
I started getting the following exception
2006-11-03 10:17:18,319 ERROR [STDERR] java.lang.ClassCastException
2006-11-03 10:17:18,319 ERROR [STDERR] at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narr
ow(PortableRemoteObject.java:229)
2006-11-03 10:17:18,319 ERROR [STDERR] at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObjec
t.java:137)
As soon as I uncomment that props.setProperty(Context.PROVIDER_URL, host);
line everything works fine.
I have seen this type of exception before when I tried invoking the ejb on a different computer as well. When I inspect the object with reflection I see that it found the right interface.
This is my code again:
Properties props = new Properties();
props.setProperty(Context.INITIAL_CONTEXT_FACTORY,"org.jboss.security.jndi.JndiLoginInitialContextFactory");
props.setProperty(Context.SECURITY_PRINCIPAL, "admin");
props.setProperty(Context.SECURITY_CREDENTIALS, "admin");
props.put(javax.naming.Context.URL_PKG_PREFIXES, "org.jboss.naming:org.jnp.interfaces");
String host = "jnp://localhost:1099";
props.setProperty(Context.PROVIDER_URL, host);
ctx = new InitialContext( props );
Object object = ctx.lookup( "ejb/com/blah/Manager" );
ManagerRemoteHome home = (ManagerRemoteHome)PortableRemoteObject.narrow ( object, ManagerRemoteHome.class);
ManagerRemote manager = home.create();
Thanks

1099 is the RMI/JRMP Registry. You are using RMI/IIOP. Is this port number really correct?

ClassCastException with Document

I have an abstract class implements DOM Document.
public abstract class XDataDoc implements Document {
I get ClassCastException when I try to parse and XML.
public XDataDoc xDataDoc ;
factory = DocumentBuilderFactory.newInstance();
parser = factory.newDocumentBuilder();
xDataDoc = parser.parse("http://url");
I have the same problem also with the classes implements Node or NodeList. I need this custom Document to use as a data source.
What am I doing wrong? Is there a better way than creating a class implements Document? (Shall I create an interface extends?)
Any help about extends / implements abstract classes and interfaces will be great useful. (I am still a newbie as you will understand)
Thanks in advance.

I have to prepare too many screens for data entry in a
web application.
I have an Oracle 8i database and servlets creating xml
from database and receiving xml to write to database.
Xml created with servlets have all similar schema as
master row and detail rows as childnode of master.
Idea is to create also custom swing objects (such as
JTextField, JcomboBox, Jlist etc) that can work bound
to DOM document. So creating screens will be easy as
easy as placing swing objects on layout.
I forget to mention also that gives the same
exception:
xDataDoc = (XDataDoc) parser.parse("http://url");
Those requirements you describe have nothing to do with your problem, though, and I don't see where they require you to implement Document. In fact you can't implement Document because the parser has already done it for you. Your code needs to look like this:
Document xDataDoc = parser.parse("http://url");

Problem with h:dataTable and conditional rowClasses

Hi!
I have a problem which I hoped somebody could have a look at. It might be that what I'm trying to do isn't possible, but I think it should have worked ;)
To give you a quick presentation of my "case" or problem:
- I have a dataTable which is filled with Document objects retrieved from a database.
- The Document object has a property "created" which is a Date timestamp
- In the dataTable I alternate the background of each row with white and blue
- Then, what I would like to do, is to do a test on the "created" property, if the Document has been created within a fixed time, present it with a yellow line instead.
- I set the different background-colors with three different styles, tableViewRow1 - tableViewRow2 and tableViewRow3 (the latest is the yellow line).
To do a test on the dates I convert them into milliseconds and do a simple subtraction - if todayDate minus createdDate is smaller than criteriaDate, then the Document is considered "new" and should have a yellow background.
This is how I've defined my dataTable:
<h:dataTable id="documentsTableView"
binding="#{documentModelFactory.htmlDataTable}"
value="#{documentModelFactory.documents}"
var="document"
columnClasses="tableViewColumn"
rowClasses="#{ (documentModelFactory.todayInMillisec - document.createdInMillisec) < documentModelFactory.criteriaInMillisec ? 'tableViewRow3':'tableViewRow1,tableViewRow2'}"
styleClass="tableView"
footerClass="tableViewFooter"
headerClass="tableViewHeader"
>
So this would be the interesting lines:
rowClasses="#{ (documentModelFactory.todayInMillisec - document.createdInMillisec)< documentModelFactory.criteriaInMillisec ? 'tableViewRow3':'tableViewRow1,tableViewRow2'}"
I don't get an exception, and my expression seems valid. But it seems like it is always rendered to be false, I only get the white and blue rows, and I don't understand why.
I have done different tests on the expression, and this confuses me, because it seems like the result is what it should be.
# Test 1
For each row I created a column printing the result of the expression, false or true.
<h:column>
<f:facet name="header">
<h:outputText value="Test " />
</f:facet>
<h:outputText value="#{ (documentModelFactory.todayInMillisec - document.createdInMillisec)< documentModelFactory.criteriaInMillisec }" />
</h:column>
In all cases this is giving me the correct result, new documents get 'true' and the old ones get 'false'.
So then I thought that there is a problem setting the tableViewRow3 param properly for the <tr class="" > :
#Test 2
I created a selectDocument action which basically just sets the document in my bean when a commandLink in the dataTable is fired.
Then, in my method I retrieve the HtmlDataTable object, and do a logging of the current rowClasses for that row:
htmlDataTable.getRowClasses() - which returns a String
If I selected an "old" document, it returned "'tableViewRow1,tableViewRow2", but if i selected a new document, it returned 'tableViewRow3'.
So it seems like my expression is rendered correctly, the rowClass is set properly, but still I don't get a yellow line. In the html source I have only <tr>'s with
'tableViewRow1' and 'tableViewRow2'.
Anybody? :)
I don't know if it has something to do with the time / when the rowClasses param is "rendered", that it doesn't know what the "document" property is at that time??? I had the impression that the html was encoded "on the fly", and then this shouldn't be a problem? But I'm not exactly an expert so.. :)
I guess an alternative solution is to do the testing in my bean and build up a comma-separated String to specify a rowClass for each row displayed in the dataTable, and then set the rowClasses to something like
rowClasses="#{bean.rowStyles}"
but first solution seems like a much easier approach (less costly as well), and it would also be interesting to know why it doesn't work.
I'm using the 1.1.3 version of myfaces-impl, myfaces-api and tomahawk
Thank you for your time!
Eivind Roennevik

I'm not sure whether i understand your problem,
It doesnot need using the binding attribute If you wanna updating the value of each rows in the datatable.
below is a sample that updating each rows of a datatable
jsp file
<h:dataTable value="#[sampleBean.data}" var="row">
    <h:column><h:inputText value="#{row.col1}"/></h:column>
</h:dataTable>
<h:commandButton value="update" action="#{sampleBean.update}"/>BackingBean:
SampleBean.java
public class Samplebean{
private SampleRow[] rows[];
public SampleRow[] getData{
          return rows;
public String update(){
      for(int i=0; i<rows.length; i++){
         rows.update();
return "success";
SampleRow.java
public class SampleRow{
private String col1;
public String getCol1(){
    return col1;
public void setCol1(String col1){
    this.col1 = col1;
public void update(){
     //write your code to save one row data to db/file here

ClassCastException with t:datatable

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