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Date: Wed, 15 Dec 2004 23:19:58 -0600
From: Ryan Crumley <crumley@gmail.com>
Reply-To: Ryan Crumley <crumley@gmail.com>
To: Jakarta Commons Users List <commons-user@jakarta.apache.org>
Subject: Re: ClassCastException with betwixt 0.6
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I was quite excited that the problem may have been found however I
changed the code so that the configuration object is shared between
the writer and reader and I am still receiving a null object back from
the reader. The new code is listed below.

The output when running the program is:

   out: <?xml version='1.0'?><PersonBean age="24" name="ryan c" id="1"/>
   null

I am still at a loss why this simple example is not working. The only
thing I can think of (unless someone sees a problem with the code I am
using below) is that my jar versions are not correct. However I used
the same jars that maven appears to use when running regression (which
passes). Any ideas on where to go next?

Thanks,
ryan

public static final void main(String args[]) throws Exception{
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0'?>");

        BeanWriter writer = new BeanWriter(out);
        
        IntrospectionConfiguration configuration =
writer.getXMLIntrospector().getConfiguration();
        configuration.setAttributesForPrimitives(true);
        configuration.setWrapCollectionsInElement(false);
        
        writer.setWriteEmptyElements( true );

        PersonBean personBean = new PersonBean();
        personBean.setName("ryan c");
        personBean.setAge(24);
        
        writer.write(personBean);
        
        System.out.println("out: " + out);
        
        StringReader xmlReader = new StringReader(out.toString());
        
        BeanReader reader = new BeanReader();
        reader.getXMLIntrospector().setConfiguration(configuration);
        reader.registerBeanClass(PersonBean.class);
        
        PersonBean person = (PersonBean) reader.parse(xmlReader);
        
        // send bean to system out
        System.out.println(person);
    }



On Wed, 15 Dec 2004 09:41:53 +0000, robert burrell donkin
<robertburrelldonkin@blueyonder.co.uk> wrote:
> hi ryan
> 
> i'm afraid you're going to kick yourself ;)
> 
> On 15 Dec 2004, at 05:45, Ryan Crumley wrote:
> 
> <snip>
> 
> > public class TestBetwixt {
> >     public static final void main(String args[]) throws Exception{
> >         StringWriter out = new StringWriter();
> >         out.write("<?xml version='1.0'?>");
> >
> >         BeanWriter writer = new BeanWriter(out);
> >         writer.setWriteEmptyElements( true );
> >
> >         PersonBean personBean = new PersonBean();
> >         personBean.setName("ryan c");
> >         personBean.setAge(24);
> >
> >         writer.write(personBean);
> >
> >         System.out.println("out: " + out);
> >
> >
> >         StringReader xmlReader = new StringReader(out.toString());
> >
> >         BeanReader reader = new BeanReader();
> >
> > reader.getXMLIntrospector().getConfiguration().setAttributesForPrimitiv
> > es(true);
>                                                  
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> this line means that the writing is configured to write primitives as
> elements but the reading configuration is expecting them to be
> attributes.
> 
> a couple of related tips:
> 
> * using the same IntrospectionConfiguration instance for the reader and
> writer will ensure that the configurations are identical;
> * XMLIntrospector caches the results of introspection (which takes
> quite a bit of time) and so as long as readers and writers share the
> same configuration, you'll get better performance if they share the
> same instance;
> 
> - robert
> 
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