On 4 Nov, 2005, at 11:06 am, Nigel Kibble wrote:
Hi,
I’m relatively new to Java, and am just starting to use XML
parsing/validating within Java for the first time. I’m finding the
whole JavaX interface / Xerces class relationship confusing, and would
really appreciate some guidance.
My question is, when I implement the code (shown below) with
XercesImpl.Jar in my classpath, am I using the Xerces SAXParser (from
the .jar) or am I using SAXParser supplied in the JDK?
I thought I had my head around this until I found the JDK is supplied
with a version of Xerces, so now I’m confused whether my code is
running the JDK version, or the latest version given in the classpath.
Apologies for the dumb question, but it’s confusing the life out of
me. If anyone can guide me it would be much appreciated.
Also, If anyone can point me to a good reference resource (website or
book) I’d be grateful.
Regards,
Nigel.
Hi Nigel,
As you've noted, Java 1.4 comes with a copy of Xerces. Unfortunately,
Sun left the package structure unchanged, so you run into trouble when
trying to use a later version of Xerces than that supplied with the
JRE. By default, the JRE classes will be used in preference to those
in the classpath. The simplest way to get Java to use your copy of
Xerces instead of its own is to use the java.endorsed.dirs system
property:
http://java.sun.com/j2se/1.4.2/docs/guide/standards/
Hope this helps.
Mark.
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.helpers.DefaultHandler;
public class XMLChecker3 extends DefaultHandler {
private boolean documentIsValid = true;
private boolean documentHadWarnings = false;
public void parseURI(String uri) {
try {
SAXParserFactory spf =
SAXParserFactory.newInstance();
spf.setNamespaceAware(true);
spf.setValidating(true);
SAXParser sp =
spf.newSAXParser();
sp.setProperty("http://java.sun.com/xml/jaxp/properties/
schemaLanguage",
"http://www.w3.org/2001/XMLSchema";);
sp.parse(uri, this);
if (documentIsValid)
System.out.println("\nYour document is valid!");
else if
(documentHadWarnings) System.out.println("\nYour document had minor
errors (warnings).");
else
System.out.println("\nYour document is not valid.");
} catch (Exception e) {
System.err.println(e);
}
}
….. exception handling methods ignored.
/** Main program entry point. */
public static void main(String argv[]) {
XMLChecker3 validator = new
XMLChecker3();
validator.parseURI(argv[0]);
}
}
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