Problem with simple datatable
Max Duval
Greenhorn
Posts: 7
posted 9 years ago
Hi!
I'm new to JSF and to experiment with JSF, and Rich Datatables I tried to create a dumb, simple project to output a simple datable with only one column.
Its so simple that it should work but its not, I cant get my datatable to iterate over my collection.
I have 2 classes :
<blockquote>code:
<pre name="code" class="core">
package test;
import java.util.ArrayList;
import java.util.Collection;
public class TestBean {
private String nomTableau;
private Collection<Detail> listeDetails;
public TestBean(){
this.nomTableau = "Commmmoonn!!!";
this.listeDetails = new ArrayList<Detail>();
this.listeDetails.add(new Detail("detail 1"));
this.listeDetails.add(new Detail("detail 2"));
this.listeDetails.add(new Detail("detail 3"));
}
public Collection<Detail> getListeDetails() {
return listeDetails;
}
public void setListeDetails(Collection<Detail> listeDetails) {
this.listeDetails = listeDetails;
}
public String getNomTableau() {
return nomTableau;
}
public void setNomTableau(String nomTableau) {
this.nomTableau = nomTableau;
}
}</pre>
</blockquote>
And :
<blockquote>code:
<pre name="code" class="core">
package test;
public class Detail {
private String detail;
public Detail(){
this.detail = "bidon";
}
public Detail(String detail){
this.detail = detail;
}
public String getDetail() {
return detail;
}
public void setDetail(String detail) {
this.detail = detail;
}
}
</pre>
</blockquote>
In faces-config.xml I put my TestBean class as bein managed :
<blockquote>code:
<pre name="code" class="core">
<faces-config>
<managed-bean>
<managed-bean-name>testBean</managed-bean-name>
<managed-bean-class>test.TestBean</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
</faces-config>
</pre>
</blockquote>
And finaly, I try to output the result in a jsp file :
<blockquote>code:
<pre name="code" class="core">
<%@ taglib uri="http://richfaces.org/a4j" prefix="a4j"%>
<%@ taglib uri="http://richfaces.org/rich" prefix="rich"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<html>
<head>
<title>Simple Data Table</title>
</head>
<body>
<rich:dataTable id="laTable" var="item" value="#{testBean.listeDetails}" >
<rich:column>
<f:facet name="header">
<h
utputText value="#{testBean.nomTableau}" />
</f:facet>
<hutputText value="#{item.nomDetail}" />
</rich:column>
</rich:dataTable>
</body>
</html>
</pre>
</blockquote>
The value of "testBean.nomTableau" is displayed but thats all. When I check the logs I always get the following output when I try to print the value of "item.nomDetail" :
<blockquote>code:
<pre name="code" class="core">
(DEBUG) ValueBindingImpl : getValue(ref=item.nomDetail)
(DEBUG) ApplicationImpl : Couldn't find a factory for item
(DEBUG) VariableResolverImpl : resolveVariable: Resolved variable:null
(DEBUG) ValueBindingImpl : getValue Result:null
(DEBUG) ValueBindingImpl : -->Returning null
(DEBUG) HtmlBasicInputRenderer : component.getValue() returned null
(DEBUG) HtmlBasicRenderer : Value to be rendered null
</pre>
</blockquote>
Anybody have an idea of what I'm doing wrong?
Thank you!
Maxime
I'm new to JSF and to experiment with JSF, and Rich Datatables I tried to create a dumb, simple project to output a simple datable with only one column.
Its so simple that it should work but its not, I cant get my datatable to iterate over my collection.
I have 2 classes :
<blockquote>code:
<pre name="code" class="core">
package test;
import java.util.ArrayList;
import java.util.Collection;
public class TestBean {
private String nomTableau;
private Collection<Detail> listeDetails;
public TestBean(){
this.nomTableau = "Commmmoonn!!!";
this.listeDetails = new ArrayList<Detail>();
this.listeDetails.add(new Detail("detail 1"));
this.listeDetails.add(new Detail("detail 2"));
this.listeDetails.add(new Detail("detail 3"));
}
public Collection<Detail> getListeDetails() {
return listeDetails;
}
public void setListeDetails(Collection<Detail> listeDetails) {
this.listeDetails = listeDetails;
}
public String getNomTableau() {
return nomTableau;
}
public void setNomTableau(String nomTableau) {
this.nomTableau = nomTableau;
}
}</pre>
</blockquote>
And :
<blockquote>code:
<pre name="code" class="core">
package test;
public class Detail {
private String detail;
public Detail(){
this.detail = "bidon";
}
public Detail(String detail){
this.detail = detail;
}
public String getDetail() {
return detail;
}
public void setDetail(String detail) {
this.detail = detail;
}
}
</pre>
</blockquote>
In faces-config.xml I put my TestBean class as bein managed :
<blockquote>code:
<pre name="code" class="core">
<faces-config>
<managed-bean>
<managed-bean-name>testBean</managed-bean-name>
<managed-bean-class>test.TestBean</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
</faces-config>
</pre>
</blockquote>
And finaly, I try to output the result in a jsp file :
<blockquote>code:
<pre name="code" class="core">
<%@ taglib uri="http://richfaces.org/a4j" prefix="a4j"%>
<%@ taglib uri="http://richfaces.org/rich" prefix="rich"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<html>
<head>
<title>Simple Data Table</title>
</head>
<body>
<rich:dataTable id="laTable" var="item" value="#{testBean.listeDetails}" >
<rich:column>
<f:facet name="header">
<h
utputText value="#{testBean.nomTableau}" /></f:facet>
<h
utputText value="#{item.nomDetail}" /></rich:column>
</rich:dataTable>
</body>
</html>
</pre>
</blockquote>
The value of "testBean.nomTableau" is displayed but thats all. When I check the logs I always get the following output when I try to print the value of "item.nomDetail" :
<blockquote>code:
<pre name="code" class="core">
(DEBUG) ValueBindingImpl : getValue(ref=item.nomDetail)
(DEBUG) ApplicationImpl : Couldn't find a factory for item
(DEBUG) VariableResolverImpl : resolveVariable: Resolved variable:null
(DEBUG) ValueBindingImpl : getValue Result:null
(DEBUG) ValueBindingImpl : -->Returning null
(DEBUG) HtmlBasicInputRenderer : component.getValue() returned null
(DEBUG) HtmlBasicRenderer : Value to be rendered null
</pre>
</blockquote>
Anybody have an idea of what I'm doing wrong?
Thank you!
Maxime
Max Duval
Greenhorn
Posts: 7
Andres Quinones
Ranch Hand
Posts: 57
posted 9 years ago
Max the problem I found is that <hutputText value="#{item.nomDetail}" /> should be <hutputText value="#{item.detail}" />, because the attribute for the class Detail is detail and the getDetail() method is the one that will return the value. Otherwise you should have a method named getNomDetail() for your actual code to work.
Also don't forget the <f:view> and <h:form> tags for the page.
Hope this helps.
utputText value="#{item.nomDetail}" /> should be <hutputText value="#{item.detail}" />, because the attribute for the class Detail is detail and the getDetail() method is the one that will return the value. Otherwise you should have a method named getNomDetail() for your actual code to work.Also don't forget the <f:view> and <h:form> tags for the page.
Hope this helps.
Max Duval
Greenhorn
Posts: 7
posted 9 years ago
Thank you Andres for your awnser.
When I sent this post, I was in the middle of changing the name in Detail to "nomDetail" but I forgot to do it before putting the code snippet.
As for the <f:view> and <h:form>, it started working when I added the <f:view> tag. I still dont have a <h:form> one.
Are those tags always mandatory? If I'm only displaying data, is <h:form> necessary?
Thansk!
Maxime
When I sent this post, I was in the middle of changing the name in Detail to "nomDetail" but I forgot to do it before putting the code snippet.
As for the <f:view> and <h:form>, it started working when I added the <f:view> tag. I still dont have a <h:form> one.
Are those tags always mandatory? If I'm only displaying data, is <h:form> necessary?
Thansk!
Maxime
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