[jdom-interest] org.jdom.contrib.ids?

[Alfredo Aldundi]

>
>> I've just downloaded jdom-contrib and tried to use the 
>> org.jdom.contrib.ids contribution. However, with the supplied test 
>> program TestIds it does not work. I call:
>>  > java TestIds testIds.xml a
>> but TestIds reports that this id does not exist (however, it is 
>> clearly in the testIds.xml file...). By the way, TestIds does not 
>> find a single id in the document...
>> I tried to find out the attribute type of the name attribute. I found 
>> out that the type is 0 (=UNDECLARED_ATTRIBUTE) and not 2 
>> (=ID_ATTRIBUTE) as it should be. The name attribute is clearly 
>> defined as type ID in the DTD. So I guess that this is not a problem 
>> of org.jdom.contrib.ids (correct?). May it be that my XML parser does 
>> not handle this correctly?
>
> Normally, a parser is required to parse any DTD declared in the 
> document to resolve entities and, by loading the DTD, knows the type 
> of each attribute.
> If your parser doesn't do, try forcing document validation in 
> TestIds.java by using:
>       SAXBuilder builder = new SAXBuilder(true);
>

Your suggestion did actually solve the problem with 
UNDECLARED_ATTRIBUTE type, but getElementById does still not find an 
element by id. I've tracked the problem to the setAttribute method in 
IdElement.java (revision 1.1). On line 137 it reads:

Document doc = this.getDocument();

A diagnostic output just after this line reveals that doc is null. In 
the next line the id is not added to the document!!! It is kind of 
strange that if I write getDocument in TestIds.java the document is not 
null (for an arbitrary element in the jdom). If I do a manual 
addAttribute(new Attribute("name", "a", Attribute.ID_ATTRIBUTE)) it 
works also.

Has anybody experienced similar problems? Is it caused by the 
SAXParser? Why is there a difference between the SAXBuilder case and 
the manual addAttribute? Or better, why is getDocument() == null in 
setAttribute(Attribute) of IdElement.java when the builder is building 
the jdom?

Any help is appreciated! Thanks!
Alfredo