public List getAllCategories(){
if(this.allCategories==null){
this.allCategories=new ArrayList();
this.allCategories.add(new SelectItem(new Category(),"Choose a category..."));
List categories=this.eventRegistry.getCategories();
for(Iterator iter=categories.iterator(); iter.hasNext();){
Category category=(Category)iter.next();
this.allCategories.add(new SelectItem(category, category.getTitle()));
}
}
return this.allCategories;
}
Srikanth Madarapu wrote:
What is the return type of allCategories ?
The list coming from allCategories should be a list of "SelectItem" objects, I think in yours case its just a list of Strings
-Srikanth
-----Original Message----- From: Kostas Karadamoglou [mailto:[EMAIL PROTECTED] Sent: Friday, March 18, 2005 9:17 AM To: [email protected] Subject: Problem with the getAsObject of a Converter
Hi again!!!
I have another problem now, Very strange Can you suggest me a solution?
I created a converter for objects of type Category in order to display some Category beans in a selectOneMenu tag.
I have debuged the application and I noticed a strange behaviour of JSF which I cannot understand.
Below I have the sequence explanation of the problem and the content of each method and jsp fragment.
1)The getAsString method works perfectly and returns the following strings "0","1","2","3","4","5","6","7"
2)The page is displayed properly, and I choose from the drop down menu a category.
2)Afterwords JSF invokes getAsObject (I think for the chosen option) with the str parameter null !!!!!!!
In this situation I return a null object (which is wrong).
4)After that when the page is redisplayed the getAsString throw an Exception because of the null value
JSP-------------------------------------------------------
<h:selectOneMenu id="selectCategory" converter="#{categoryConverter}" value="#{eventHandler.selectedCategory}">
<f:selectItems id="allCategories" value="#{eventHandler.allCategories}"/>
</h:selectOneMenu>
getAsString------------------------------------------------
public String getAsString(FacesContext facesContext, UIComponent uIComponent, Object obj) throws ConverterException {
String retValue=null;
if(obj==null)
throw new ConverterException("not null object of type Category expected");
else if(obj instanceof Category){
Category category=(Category)obj;
map.put(new Integer(category.getId()), category);
retValue=String.valueOf(category.getId());
}else{
throw new ConverterException("object of type Category expected received: "+obj.getClass().getName()+"="+obj.toString());
}
return retValue;
}
getAsObject------------------------------------------------
public Object getAsObject(FacesContext facesContext, UIComponent uIComponent, String str) throws ConverterException {
Category retValue=null;
if(str!=null){
try{
System.out.println(str);
Integer id=Integer.valueOf(str);
retValue=(Category)map.get(id);
}catch(Exception ex){
throw new ConverterException("a number formatted string expected");
}
}else{
//throw new ConverterException("a not null string expected");
return null;
}
return retValue;
}
