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Struts

Problems with Indexed Properties, Hidden Values and Logic Iterate Tag

Greenhorn

Posts: 12

posted 16 years ago

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Hi to all.
I'm using Struts 1.3, Tomcat 6.0 and Eclipse.

I have a problem with Indexed Properties.
I have a jsp that should save hidden values and pass it to the linked Action.

I show you my code.

********
JSP PAGE
********

where
- 'listaSport' is a list containing a list of sports. This list is correctly populated by the previous Action through 'select' and 'optionsCollection' tags.
- 'hSportBean' is a LabelValueBean list where I have to save the select options.

***********
ACTION FORM
***********

public class CreazioneProfiloUtenteForm extends ActionForm
{
private String sport;
private ArrayList listaSport;
private ArrayList listaRuoli;
private Object[] ruoliSelezionati;

public ActionErrors validate(ActionMapping mapping,HttpServletRequest request) {
return null;
}

public void reset(ActionMapping mapping, HttpServletRequest request) {

}

public LabelValueBean getHSportBean(int index)
    {
        if(this.listaSport == null)
        {
            this.listaSport = new ArrayList();
        }
        
        while(index >= this.listaSport.size())
        {
            this.listaSport.add(new LabelValueBean());
        }
 
        return (LabelValueBean) listaSport.get(index);
    }
 
public String getSport() {
return sport;
}
 
public void setSport(String sport) {
this.sport = sport;
}
 
public ArrayList getListaSport() {
return listaSport;
}
 
public void setListaSport(ArrayList listaSport) {
this.listaSport = listaSport;
}
 
public ArrayList getListaRuoli() {
return listaRuoli;
}
 
public void setListaRuoli(ArrayList listaRuoli) {
this.listaRuoli = listaRuoli;
}
 
public Object[] getRuoliSelezionati() {
return ruoliSelezionati;
}
 
public void setRuoliSelezionati(Object[] ruoliSelezionati) {
this.ruoliSelezionati = ruoliSelezionati;
}
 
}

******
ACTION
******

The problem is that I can't load in Action the hidden values saved in the jsp page.
I tried to print the values received

but I always obtain null values (for all indexes).

So, I don't know how to solve my problem.

I also followed guidelines in:
http://faq.javaranch.com/java/IndexedProperties
http://struts.apache.org/1.x/struts-taglib/indexedprops.html
http://mail-archives.apache.org/mod_mbox/struts-user/200604.mbox/%3C5B7D2ACE8204B748980CEB2DBFAB90B3972E53@mail.delta-informatique.net%3E
but with no success.

Can you help me?

Thanks a lot in advance.

Michele Giunti

Greenhorn

Posts: 12

posted 16 years ago

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Help!

Merrill Higginson

Ranch Hand

Posts: 4864

posted 16 years ago

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Frankly, I don't see anything wrong with your code. It should work! Just a couple of questions:

Is the result of the System.out.println statements a null pointer exception, or is the value simply null?

Use your browser's "view source" option on this page. The hidden fields should look like this. do they?

Merrill
Consultant, Sima Solutions

Michele Giunti

Greenhorn

Posts: 12

posted 16 years ago

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Originally posted by Merrill Higginson:
Frankly, I don't see anything wrong with your code. It should work! Just a couple of questions:

Is the result of the System.out.println statements a null pointer exception, or is the value simply null?

Use your browser's "view source" option on this page. The hidden fields should look like this. do they?
<input type="hidden" name="hSportBean[0].label" value="somevalue" > <input type="hidden" name="hSportBean[0].value" value="somevalue" > <input type="hidden" name="hSportBean[1].label" value="somevalue" > <input type="hidden" name="hSportBean[1].value" value="somevalue" >

Dear Merrill, first of all tahnks for your reply.

About your questions.
1) I modified my Action to check the values returned from jsp. I don't get a NullPointer Exception. I just get null values. For examples, I print the first (index=0) LabelValueBean of the list but I get the following output:
lvb[0].label=null
lvb[0].value=null

2) Yes, I get what you expect.

So, I can't understand where is the problem.

Tom Rispoli

Ranch Hand

Posts: 349

posted 16 years ago

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I ran into something similar to this once a long time back. The problem was that java.beans.Introspector.getBeanInfo() was being called on my form it was determining that my private ArrayList was a propert (not an indexed property). If I remember correctly my solution was to make sure that I had an indexed version of both getter and setter methods. I think I may have also had to play with the order that the methods appeared in my form class.

I was using java 1.4.2 at the time and when I used a debugger on the Introspector class it appeared to me that it was finding a non-indexed getter or setter and from that assuming that the property itself wasn't indexed. I can't be sure that this is your problem but its something you might want to try. I know I wasted a huge amount of time figuring it out.

Michele Giunti

Greenhorn

Posts: 12

posted 16 years ago

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Originally posted by Tom Rispoli:
I ran into something similar to this once a long time back. The problem was that java.beans.Introspector.getBeanInfo() was being called on my form it was determining that my private ArrayList was a propert (not an indexed property). If I remember correctly my solution was to make sure that I had an indexed version of both getter and setter methods. I think I may have also had to play with the order that the methods appeared in my form class.

I was using java 1.4.2 at the time and when I used a debugger on the Introspector class it appeared to me that it was finding a non-indexed getter or setter and from that assuming that the property itself wasn't indexed. I can't be sure that this is your problem but its something you might want to try. I know I wasted a huge amount of time figuring it out.

Thanks for your reply.
Unfortunately, this is not my problem.

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