RE: Editable DataTable

Rogerio Saulo (P) Fri, 16 Dec 2005 08:26:09 -0800

I Found the problem,

The problem only occurs when the preserveDataModel attribute is set to true in the dataTable.

If I set the preserveDataModel to false, all works fine.

Someone have this behavior ???

Rogerio

From: Rogerio Saulo (P) [mailto:[EMAIL PROTECTED]
Sent: Friday, December 16, 2005 11:32 AM
To: MyFaces Discussion
Subject: Editable DataTable

Hi All,

I´m having trouble with an situation that i think is simple.

I have a collection of objects that need to be displayed in a data table and updated later.

The collection in the backing bean is a ArrayList and polulated with objects of type AttributeVO that has name and value attributes.

if i associate the collection in the backing bean with the data table in the page the table is displayed OK, the strange is that if the backing bean have the SETTER for the data table the page stop working with the following exception :

Cannot set value for _expression_ '#{DesktopBean.atributosDesktop}' to a new value of type br.com.gsb.model.vos.AttributeVO

t javax.faces.webapp.FacesServlet.service(FacesServlet.java:121)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

at br.com.gsb.view.util.SecurityFilter.doFilter(SecurityFilter.java:60)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

at org.apache.myfaces.component.html.util.ExtensionsFilter.doFilter(ExtensionsFilter.java:123)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

at br.com.gsb.view.util.OpenHibernateSessionFilter.doFilter(OpenHibernateSessionFilter.java:41)

t org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)

at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)

at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)

at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)

at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)

at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)

at java.lang.Thread.run(Thread.java:595)

Looks like JSF is trying to set the AttributeVO on the Collection field.

Bellow is the relevant source for the Backing Bean VO and JSP.

-----------------------------------------------------------------------------

public class AttributeVO extends BaseVO {

private String name;
private String value;

/**
* @return Returns the name.
*/
public String getName() {
  return name;
}
/**
* @param name The name to set.
*/
public void setName(String name) {
  this.name = name;
}
/**
* @return Returns the value.
*/
public String getValue() {
  return value;
}
/**
* @param value The value to set.
*/
public void setValue(String value) {
  this.value = value;
}

Backing Bean

-------------------------------------------------------------------------

private Collection atributosDesktop = null;

/**
* @param atributosDesktop The atributosDesktop to set.
*/
public void setAtributosDesktop(Collection atributosDesktop) {
this.atributosDesktop = atributosDesktop;
}

/**
* @return Returns the atributosDesktop.
*/
public Collection getAtributosDesktop() {
return atributosDesktop;
}

JSP

--------------------------------------------------------------------------------------

<x:dataTable id="data" width="99%" border="0"

styleClass="standardTable"

headerClass="standardTable_Header"

rowClasses="standardTable_Row1,standardTable_Row2"

columnClasses="standardTable_ColumnCentered, standardTable_ColumnCentered, standardTable_ColumnRight, standardTable_ColumnRight"

var="row"

preserveDataModel="true"

value="#{DesktopBean.atributosDesktop}"

rows="10">

<h:column>

<f:facet name="header">

<h:outputText id="hdrNome" value="Nome Atributo" />

</f:facet>

<h:outputText value="#{row.name}" />

</h:column>

<h:column>

<f:facet name="header">

<h:outputText id="hdrValor" value="Valor" />

</f:facet>

<h:inputText value="#{row.value}" size="80" />

</h:column>

</x:dataTable>

Thanks in advance

Rogerio

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