Newbie, how declaring read only variables?

[jonnyrico]

Hi,

I am using JBoss5.1.0 with RichFaces. I have a very simple form with an inputText and a progressbar. I am using this Bean.

public class Bean {
 public String text;
 public Integer pro;
 public Bean() {
 }
 public String getText() {
 return text;
 }
 public void setText(String text) {
 this.text = text;
 if (this.text != null) {
 this.pro = this.text.length();
 }
 }
 public Integer getPro() {
 return pro;
 }
 public void setPro(Integer pro) {
 this.pro = pro;
 }
}

My problem is, that I don't want to implement the setPro-Method because it's unnecessary. I guess I have to configure it in faces-config.xml but like I said I don't know how. May anybody give me some advise how to do it?
Thanks a lot

Jonny

[nbelaevski]

Hi Jonny,

You don't have to configure this. Don't implement setter for read-only fields and that's all

[jonnyrico]

Hi,

thank for reply. That was my first intention but if I don't declare a method setPro(), I'll get an error-message(NullPointer-Exception) when I open the page.

Do you mean I have to declare a method setPro() without any content? Just

 public void setPro(Integer pro) {}

Thanks a lot.

Jonny

[ebross]

Alternatively,  you could use 'private' instead of 'public':

private void setPro(Integer pro) {
 this.pro = pro;
 }

This will prevents a write outside the 'Bean', and with a “public String getPro()” method, you will have your 'read only'.

But one more important thing: Is your component a ui input? For example, is it “h:inputText”? If so, since you only want 'read only', replace it with “h:outputText”. If you use a ui input, jsf will assume that you have a setter method, hence the NPE.

[jonnyrico]

Hi,

the component I want to use is a progressbar and I would like to set the value-attribute through the Bean-property.

[ebross]

Then you want:

<rich:progressBar value="#{yourBean.pro}" ...

HtmlProgressBar is a ui command like HtmlCommandButton and HtmlAjaxCommandButton, so  you don't need a setter method for it, Your getPro() signature will do.  And to set “rich:progressBar” value, do some processing and then return a value in getPro to set the  rich:progressBar value.

Here is a 'must see':

http://community.jboss.org/wiki/SimplePingApplicationwithrichprogressBar

[jonnyrico]

okay thank you. I'll try.

Thanks a lot.

Jonny