XOM API for Processing XML with Java

[dirk bergstrom <dirk AT juniper.net>]

i got the following error running 1.0d10:

java.lang.NullPointerException
        at nu.xom.TextWriter.writeAttributeValue(TextWriter.java:171)
        at nu.xom.Serializer.write(Serializer.java:224)
        at nu.xom.Serializer.write(Serializer.java:477)
        at nu.xom.Serializer.write(Serializer.java:164)
        at net.juniper.rli.xml.XMLifier.renderToStream(XMLifier.java:71)

i had set preserveBaseUri(true) on the serializer, but hadn't actually
defined a base uri (the perils of cut-n-paste).  it's my fault for asking
the library to do the impossible, but i don't think it should throw an NPE.
 writeAttributeValue is looking for the length of the baseURI string...

the problem is here:

// check to see if we need an xml:base attribute
if (preserveBaseURI) {
    if (element.getAttribute("base",
      "http://www.w3.org/XML/1998/namespace";) == null) {
        ParentNode elemParent = element.getParent();
        if (elemParent == null || elemParent instanceof Document
          || !element.getBaseURI().equals(elemParent.getBaseURI())) {
            escaper.writeMarkup(' ');
            escaper.writeMarkup("xml:base=\"");
>>>>        escaper.writeAttributeValue(element.getBaseURI());
            escaper.writeMarkup("\"");
        }
    }
}

----------------

public void writeAttributeValue(String s) throws IOException {
    for (int i=0; i < s.length(); i++) {
        writeAttributeValue(s.charAt(i));
    }
}


here's the relevant part of my code:

    public static void renderToStream(Object thing, OutputStream out)
            throws IOException {
        Document doc = render(thing);
        Serializer serializer = new Serializer(out, "ISO-8859-1");
        serializer.setIndent(2);
        serializer.setMaxLength(64);
        serializer.preserveBaseURI(true);
        serializer.write(doc);
        serializer.flush();
    }


thanks.

-- 
Dirk Bergstrom               dirk AT juniper.net
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Juniper Networks Inc.,          Computer Geek
Tel: 408.745.3182           Fax: 408.745.8905