Re: JSF technology

From:

gk <srcjnu@gmail.com>

Newsgroups:

comp.lang.java.programmer

Date:

Wed, 22 Sep 2010 20:39:16 -0700 (PDT)

Message-ID:

<73939759-28a9-45ef-86a5-6078dd132671@l25g2000prn.googlegroups.com>

On Sep 18, 4:22 pm, "Arved Sandstrom" <dces...@hotmail.com> wrote:

gk wrote:

On Sep 18, 2:33 am, "Arved Sandstrom" <dces...@hotmail.com> wrote:

gk wrote:

On Sep 17, 4:54 pm, Lew <no...@lewscanon.com> wrote:

gk wrote:

Thanks. I did a look up on that and found the conversion . see the
example below. I think this is a data conversion.

It was "String age" in Backing bean but in Page view we are using
converter="javax.faces.Integer" to convert this data. So, This is
a data conversion I think.


<h:message showSummary="true" for="age"/>
<h:inputText id="age"
value="#{user.age}"
converter="javax.faces.Integer" />


public String getAge() {return this.age;}
public void setAge(String age){this.age = age;}
private String age;

Shouldn't the backing-bean methods be
public Integer getAge();
public void setAge( Integer age );
?

I checkd it . but the source has private String age;

I think probabily thats why we have converter="javax.faces.Integer"
in the JSF tag to convert String to Integer ....is not it ? what
say ?

That source is not doing you any favours. The backing (managed) bean
field/getter/setter data types should be what you want *after*
conversion, not before it. Otherwise the process would be somewhat
absurd, as everything would be a String and in what other publicly
accessible spot would you find the converted values?

I got confused now. Did you mean the example I posted is NOT a JSF
data conversion example ? OR you are trying to say its a CORRECT
example but NOT a GOOD one ?

By anyway , could you please post me an correct example for data
conversion ? Alternatively, Could you please post me a relevant link
which explains this stuff . so that I can look up the details what you
are referring at.

I have checked the sources and have come up with that example. But
from your comments , it seems to me I landed to a wrong place. Could
you please correct me what should be correct example ?

Regards.

There are lots of good resources. Simply going through some Google result=

pages I could suggest the following:

http://facestutorials.icefaces.org/tutorial/converter-tutorial.htmlhttp:/=

/www.ibm.com/developerworks/library/j-jsf3/(somewhat dated but still

a good read)
andhttp://johnderinger.wordpress.com/2007/10/11/validators-and-converters=

looks OK.

Also read up on the lifecycle:

http://download.oracle.com/javaee/5/tutorial/doc/bnaqq.htmlhttp://balusc.=

blogspot.com/2006/09/debug-jsf-lifecycle.htmlhttp://www.ibm.com/developerwo=
rks/library/j-jsf2/

I'd have to see the complete source that you've been using to judge it. A=

it is, it's pointless to use an integer converter in your page yet the
corresponding managed bean property is a String. If it's an online source
I'd be interested in the link.

what a coincidence ! your third link was my source !

please check out this link http://johnderinger.wordpress.com/2007/10/11/va=
lidators-and-converters/

I copied example from there. does that mean I'm correct :)