Hi Jessica,
Thanks for the test case, I'll give this a try here and see what I can
find out. If you have a moment, can you open up a bug report
(http://jira.codehaus.org/browse/CASTOR) on this and let me know the bug
number so I can then assign it to myself. This way we can track the
progress on the issue.
Thanks,
--Keith
Jessica Perry Hekman wrote:
Okay! I got it breaking :)
The problem appears to occur NOT when I add in the FieldHandler for
java.util.Currency but when I remove these lines
<field name="prices" collection="set"
type="com.ingenta.ics.ecommerce.api.item.Price">
<bind-xml name="price"/>
</field>
and replace them with
<field name="prices" collection="set" container="false"/>
I made that switch in the first place because the Set of Price objects
(each of which contain a Currency) was unmarshalling as null and I
couldn't figure out why. I'll keep investigating that. In the meantime,
though, you can see my test case (which does not use Price objects --
those are too complex -- it uses CurrencyContainer objects for
simplicity's sake) at:
http://pendaran.arborius.net/~jphekman/testcase.tgz
Untar and set your classpath like so
export
CLASSPATH=$CLASSPATH:build/classes:lib/castor-xml.jar:lib/xml-apis.jar:lib/xercesImpl.jar:lib/commons-logging.jar
and then run like so
java com.ingenta.Mapper
and expect to see the error
Exception in thread "main" java.lang.NullPointerException
at
org.exolab.castor.xml.util.XMLFieldDescriptorImpl.hashCode(XMLFieldDescriptorImpl.java:416)
at java.util.HashMap.hash(HashMap.java:261)
...although perhaps all that is unnecessary, and perhaps it is clear to
you what the problem is, now that I know what syntax change caused it.
Thank you very much!
Jessica
On Wed, Nov 30, 2005 at 10:57:36PM -0600, Keith Visco wrote:
Hi Jessica,
I haven't seen that problem before. Is it possible for you to send me a
working (ie compilable and demonstrates the problem) test case which I
can run locally?
--Keith
Jessica Perry Hekman wrote:
Hi all. I have a class which has a method (getCurrency()) which returns
type java.util.Currency. The doc seems to suggest that writing a custom
field handler is the way to proceed, and provides good instruction on how
to do so. I created:
package com.ingenta.ics.api.rest.product;
import org.exolab.castor.mapping.GeneralizedFieldHandler;
import org.exolab.castor.mapping.FieldDescriptor;
import java.util.Currency;
/**
* The FieldHandler for the Currency class
**/
public class CurrencyFieldHandler
extends GeneralizedFieldHandler
{
public CurrencyFieldHandler() {
super();
}
public Object convertUponGet(Object value) {
if (value == null) return null;
Currency currency = (Currency)value;
return currency.getCurrencyCode();
}
public Object convertUponSet(Object value) {
return Currency.getInstance((String)value);
}
public Class getFieldType() {
return Currency.class;
}
public Object newInstance( Object parent )
throws IllegalStateException
{
//-- Since it's marked as a string...just return null,
//-- it's not needed.
return null;
}
}
and in the XML:
<class name="com.ingenta.ics.ecommerce.api.item.Price">
<map-to xml="price"/>
<field name="id" type="com.ingenta.ics.item.Id" />
<field name="amount" type="big-decimal"/>
<field name="currency" type="string"
handler="com.ingenta.ics.api.rest.product.CurrencyFieldHandler"/>
</class>
Now, marshalling works beautifully. Unmarshalling gives me:
1)
testProduct(com.ingenta.ics.api.item.ProductMarshallingTest)java.lang.NullPointerException at
org.exolab.castor.xml.util.XMLFieldDescriptorImpl.hashCode(XMLFieldDescriptorImpl.java:416)
at java.util.HashMap.hash(HashMap.java:261)
at java.util.HashMap.containsKey(HashMap.java:339)
I am not sure what's going on -- was I supposed to implement hashCode?
Castor's doc doesn't say so. Is this error familiar to anyone?
Thanks in advance,
Jessica
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