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Posted to users@wicket.apache.org by wenm <wm...@tdc.dk> on 2008/06/02 11:34:38 UTC

problem when reading properties file

I want to read a properties file test.properties, and show the value which is
defined in properties file in a lable. But I can't read the properties file

I have tried 
property.load(ClassLoader.getSystemResourceAsStream("test.properties"));
property.load(this.getClass().getClassLoader().getResourceAsStream("test.properties"));
property.load(PackageResource.get(test.class,
"test.properties").getResourceStream().getInputStream());
property.load(((WebApplication)
Application.get()).getServletContext().getResourceAsStream("test.properties"));

But it always generate null point error
java.lang.NullPointerException    
 at java.util.Properties$LineReader.readLine(Properties.java:365)     
at java.util.Properties.load(Properties.java:293)

Then I tried to test reading in main method, and it works fine there. 
public static void main(String[] args){
          Properties property = new Properties();
          try {
           
property.load(ClassLoader.getSystemResourceAsStream("test.properties"));
                     } catch (IOException e) {
            e.printStackTrace(); }
          System.out.println(property.getProperty("a key"));
     } 

Really can't understand why. Did I do something in wrong way? Thanks for any
help or sugestion.
 
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Re: problem when reading properties file

Posted by Eyal Golan <eg...@gmail.com>.

Exactly as James suggest and what I said earlier:
use something like this,
add( new Label( "page.label", new ResourceModel( "page.label" ) );
Instead of 'page.label' do something like error.label.key#

where key# is what you get from the service.



On Mon, Jun 2, 2008 at 3:05 PM, James Carman <ja...@carmanconsulting.com>
wrote:

> On Mon, Jun 2, 2008 at 8:01 AM, wenm <wm...@tdc.dk> wrote:
> >
> > Sure.
> >
> > Maybe I need to explain more explicitly.
> >
> > I will get the unique error code from web service if there is something
> > wrong. And then I would like to map the error codes to user-friendly
> > messages (which are in properties file), and show the messages
> conditionally
> > based on the error type in a label.
> >
> > For example
> > if(error code == 1){
> >  add(new Label("a", property.getProperty(key1)));
> > } else if (error code ==2){
> >  .............
> > }
> >
> > So the first thing is that I have to read the properties file and let the
> > property to load it, so I can get the value(the message which I want to
> > show).
>
> Have you looked at org.apache.wicket.model.ResourceModel?  You could do:
>
> new Label("a", new ResourceModel(key1))
>
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-- 
Eyal Golan
egolan74@gmail.com

Visit: http://jvdrums.sourceforge.net/
LinkedIn: http://www.linkedin.com/in/egolan74