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.
VO
-----------------------------------------------------------------------------
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;
}
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;
}
* @param atributosDesktop The atributosDesktop to set.
*/
public void setAtributosDesktop(Collection atributosDesktop) {
this.atributosDesktop = atributosDesktop;
}
/**
* @return Returns the atributosDesktop.
*/
public Collection getAtributosDesktop() {
return 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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