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Re: trouble creating javax.xml.validation.Validator from locally cached version of XMLSchema.xsd

From: Michael Glavassevich <mrglavas@ca.ibm.com>
Date: Tue, 4 Jan 2011 18:55:51 -0500
To: Andy Davidson <andy_davidson@apple.com>
Cc: xmlschema-dev@w3.org
Message-ID: <OF16C1857A.778B8AED-ON8525780E.008315D2-8525780E.00837628@ca.ibm.com>
Hi Andy,

I was referring to the DOCTYPE at the top of XMLSchema.xsd:

<?xml version='1.0' encoding='UTF-8'?>
<!-- XML Schema schema for XML Schemas: Part 1: Structures -->
<!-- Note this schema is NOT the normative structures schema. -->
<!-- The prose copy in the structures REC is the normative -->
<!-- version (which shouldn't differ from this one except for -->
<!-- this comment and entity expansions, but just in case -->
<!DOCTYPE xs:schema PUBLIC "-//W3C//DTD XMLSCHEMA 200102//EN"
"XMLSchema.dtd" [

...

You do see that, right?

Thanks.

Michael Glavassevich
XML Parser Development
IBM Toronto Lab
E-mail: mrglavas@ca.ibm.com
E-mail: mrglavas@apache.org

Andy Davidson <andy_davidson@apple.com> wrote on 01/04/2011 05:49:59 PM:

> Hi Michael
>
> turns out XMLSchema.xsd is really a DTD
>
> as far as I can tell this is the only foreign reference in the DTD.
> <xs:import namespace="http://www.w3.org/XML/1998/namespace"
schemaLocation="
> http://www.w3.org/2001/xml.xsd">
>
> I create an array of Sources. with entries for XMLSchema.xsd and
> xml.xsd. I wonder if setSystemID has an effect on how things are
> resolved? I know that before I called setSystemID( "http://
> www.w3.org/2001/XMLSchema.xsd") I was not able to correctly fetch
> XMLSchema.xsd using the URL http://www.w3.org/2001/XMLSchema.xsd
>
> I have tried calling setSystemID() with the following values, but
> always get the same SAXParseException. (the exception msg prints
> contains what ever value I passed to setSystemID()
>
> http://www.w3.org/2001/XMLSchema
> http://www.w3.org/2001/XMLSchema.xsd
> XMLSchema.xsd
> null
> ./cache/www.w3.org/2001/XMLSchema.xsd
>
> Any ideas how I can debug this?
>
> thanks
>
> Andy
>
> On Jan 4, 2011, at 1:36 PM, Michael Glavassevich wrote:
>
> Andy,
>
> XMLSchema.xsd has a DTD. Did you also download it (i.e.
> XMLSchema.dtd) and everything else it references?
>
> The most likely reason why this is failing is because the parser
> can't find the DTD relative to wherever you put XMLSchema.xsd in
> your local file system.
>
> Thanks.
>
> Michael Glavassevich
> XML Parser Development
> IBM Toronto Lab
> E-mail: mrglavas@ca.ibm.com
> E-mail: mrglavas@apache.org
>
> Andy Davidson <andy_davidson@apple.com> wrote on 01/04/2011 04:09:29 PM:
>
> > Hi
> >
> > I need to write a code generation tool that takes in XSD files as
> > input. The first thing I want to do is make sure the XSD input file
> > is valid. My code works fine if create the
> > javax.xml.transform.Source using the URL http://www.w3.org/2001/
> XMLSchema.xsd
> > .  Some times the tool must be used offline. In this case I want to
> > load XMLSchema.xsd from the local file system. For unknown reason I
> > can not get this to work. I keep getting a SAXParseException
> >
> > [ERROR] Parse error line:-1 col:-1schema_reference.4: Failed to read
> > schema document './cache/www.w3.org/2001/XMLSchema.xsd', because 1)
> > could not find the document; 2) the document could not be read; 3)
> > the root element of the document is not <xsd:schema>.
> >
> > I checked the current working and directory and know that the file
> > it is complaining about exists.
> >
> > Any idea what I am doing wrong?
> >
> > thanks
> >
> > Andy
> >
> > import static java.lang.System.err;
> >
> > import java.io.File;
> > import java.io.FileInputStream;
> > import java.io.FileNotFoundException;
> > import java.io.IOException;
> > import java.io.InputStream;
> >
> > import java.net.HttpURLConnection;
> > import java.net.URL;
> >
> > import javax.xml.transform.Source;
> > import javax.xml.transform.stream.StreamSource;
> > import javax.xml.validation.Schema;
> > import javax.xml.validation.SchemaFactory;
> > import javax.xml.validation.Validator;
> >
> > import org.xml.sax.SAXException;
> > import org.xml.sax.SAXParseException;
> >
> > import pojo2pooco.Settings;
> >
> > public class ValidateSchema {
> > static Validator validator;
> >
> > static {
> > //
> > // 1. Lookup a factory for the W3C XML Schema language
> > SchemaFactory factory = SchemaFactory.newInstance("http://
> > www.w3.org/2001/XMLSchema");
> >
> > Source sources[] = ValidateSchema.getSources();
> >
> > // 2. Compile the schema.
> > Schema schema = null;
> > try {
> > schema = factory.newSchema(sources);
> >
> > } catch (SAXParseException spe) {
> > [ERROR] Parse error line:-1 col:-1schema_reference.4: Failed to read
> > schema document 'http://www.w3.org/2001/XMLSchema.xsd', because 1)
> > could not find the document; 2) the document could not be read; 3)
> > the root element of the document is not <xsd:schema>.
> >
> > ValidateSchema.printSAXParseError(spe);
> > System.exit(1);
> >
> > } catch (SAXException e) {
> > err.println( "[ERROR] " + e);
> > e.printStackTrace();
> > System.exit(1);
> > }
> >
> > // 3. Get a validator from the schema.
> > validator = schema.newValidator();
> > }
>
> > private static Source[] getSources() {
> > Source ret[] = null;
> > // try to use version from w3.org
> > String schemaLocation = new String
("http://www.w3.org/2001/XMLSchema.xsd");
> >
> > /**
> > * <xs:import namespace="http://www.w3.org/XML/1998/namespace"
> schemaLocation="
> > http://www.w3.org/2001/xml.xsd">
> > */
> >
> > String namespaceLocation = new String
("http://www.w3.org/2001/xml.xsd");
> >
> > if (isURLContentAvalibleFromServer(schemaLocation) &&
> > isURLContentAvalibleFromServer(namespaceLocation)) {
> > ret = new Source[1];
> > ret[0] = getSourceFromServerForURL(schemaLocation);
> > // we do not need namespaceLocation
> >
> > } else {
> > err.println("[INFO] could not get files from www.w3.org");
> > err.println("[INFO] will try to use cache versions from " + Settings.
> > localCachePath);
> > ret = new Source[2];
> > err.println( "******* AEDWIP pwd = " + System.getProperty("user.dir"));
> > String fileName = Settings.localCachePath + "/www.w3.org/2001/
> XMLSchema.xsd";
> > // I tried different systemID values
> > ret[0] = getSourceFromLocalCacheFor(fileName, fileName); //null
> > //"XMLSchema.xsd" //schemaLocation
> > fileName = Settings.localCachePath + "/www.w3.org/2001/xml.xsd";
> > ret[1] = getSourceFromLocalCacheFor(fileName, fileName); //null //
> > "xml.xsd" //namespaceLocation
> > }
> >
> > return ret;
> > }
> >
> > private static Source getSourceFromLocalCacheFor(String fileNameStr,
> > String systemID) {
> >
> > Source ret = null;
> >         File file = new java.io.File(fileNameStr);
> > InputStream input = null;
> > try {
> > input = new FileInputStream(file);
> > } catch (FileNotFoundException e) {
> > err.println("[ERROR] getSourceFromLocalCacheFor()"  +
> > e.getLocalizedMessage());
> > System.exit(1);
> > }
> > ret = new StreamSource(input);
> > ret.setSystemId(systemID);
> > return ret;
> > }
> >
> > private static Source getSourceFromServerForURL(String urlStr) {
> > Source ret = null;
> > try {
> > URL url = new URL(urlStr);
> > InputStream input = url.openStream();
> > ret = new StreamSource(input);
> > ret.setSystemId(urlStr);
> > } catch (Exception ex) {
> > err.println( "[ERROR] could not create source for "
> > + urlStr
> > + " " + ex.getLocalizedMessage());
> > }
> >
> > return ret;
> > }
> >
> > private static boolean isURLContentAvalibleFromServer(String
testURLStr) {
> > boolean ret = false;
> > HttpURLConnection connection = null;
> >
> > try {
> > connection = (HttpURLConnection) new URL(testURLStr)
> > .openConnection();
> > connection.setRequestMethod("HEAD");
> > int responseCode = connection.getResponseCode();
> >
> > if (responseCode == 200) {
> > ret = true;
> > }
> > } catch (Exception ex) {
> > // content is not available
> > ret = false;
> > } finally {
> > if (connection != null) {
> > connection.disconnect();
> > }
> > }
> >
> > return ret;
> > }
Received on Tuesday, 4 January 2011 23:56:40 GMT

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