How do I find out why DOM parser fails

[Colin Paul Adams]

In the CForms xml binding script, there is code similar to:

function loadDocument(uri) {
    var parser = null;
    var source = null;
    var resolver = null;
    try {
        parser = 
cocoon.getComponent(Packages.org.apache.excalibur.xml.dom.DOMParser.ROLE);
        resolver = 
cocoon.getComponent(Packages.org.apache.cocoon.environment.SourceResolver.ROLE);
        source = resolver.resolveURI(uri);
        var is = new Packages.org.xml.sax.InputSource(source.getInputStream());
        is.setSystemId(source.getURI());
        var document = parser.parseDocument(is);
        cocoon.log.debug (document);
        return document;     
    } 
    finally {
        if (source != null)
            resolver.release(source);
        cocoon.releaseComponent(parser);
        cocoon.releaseComponent(resolver);
    }
}

but I am getting a value of null for the document variable.
How do I find out why the parser is failing to parse the document
content (which should be perctly valid xml)?
-- 
Colin Paul Adams
Preston Lancashire

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