XML SAX dtd Validation Problem

Question

Hi,
          I’m having problems getting an xml document to validate within Weblogic 8.1. I am trying to parse a document that references both a dtd and xsd. Both the schema and dtd reference need to be substituted so they use local paths. I specify the schema the parser should use and have created an entityResolver to change the dtd reference.
          When this runs as a standalone app from eclipse the file parses and validates without a problem. When deployed to the app server the process seems to be unable read the contents of the dtd. Its not that it cannot find the file (no FileNotFoundException is thrown but this can be created if I delete the dtd) rather it seems to find no declared elements.
          Initial thought was that the code didn’t have access to read the dtd from its location on disk, to check I moved the dtd to within the deployed war and reference as a resource. The problem still persists.
          Code Snippet:
          boolean isValid = false;
          try {
          // Create and configure factory
          SAXParserFactory factory = SAXParserFactoryImpl.newInstance();
          factory.setValidating(true);
          factory.setNamespaceAware(true);
          // To be notified of validation errors in the XML document,
          // add a custom error handler to the document builder
          PIMSFeedFileValidationHandler handler
          = new PIMSFeedFileValidationHandler();
          // Create and Configure Parser
          SAXParser parser = factory.newSAXParser();
          parser.setProperty(JAXP_SCHEMA_LANGUAGE, W3C_XML_SCHEMA);
          parser.setProperty(NAMESPACE_PROPERTY_KEY, getSchemaFilePath());
          // Set reader with entityResolver for dtd
          XMLReader xmlReader = parser.getXMLReader();
          xmlReader.setEntityResolver(new SAXEntityResolver(this.dtdPath));
          // convert file to URL, as it is a remote file
          URL url = super.getFile().toURL();
          // Open an input stream and parse
          InputStream is = url.openStream();
          xmlReader.setErrorHandler(handler);
          xmlReader.parse(new InputSource(is));
          is.close();
          // get the result of parsing the document by checking the
          // errorhandler's isValid property
          isValid = handler.isValid();
          if (!isValid) {
          LOGGER.warn(handler.getMessage());
          LOGGER.debug("XML file is valid XML? " + isValid);
          } catch (ParserConfigurationException e) {
          LOGGER.error("Error parsing file", e);
          } catch (SAXException e) {
          LOGGER.error("Error parsing file", e);
          } catch (IOException e) {
          throw new FeedException(e);
          return isValid;
          See stack trace below for a little more info.
          2005-01-28 10:24:09,217 [DEBUG] [file] - Attempting validation of file 'cw501205.wa1.xml' with schema at 'C:/pims-feeds/hansard/schema/hansard-v1-9.xsd'
          2005-01-28 10:24:09,217 [DEBUG] [file] - Entity Resolver is using DTD path file:C:/Vignette/runtime_services/8.1/install/common/nodemanager/
          VgnVCMServer/stage/pims-hansard/pims-hansard.war/WEB-INF/classes/com/morse/pims/cms/feed/sax/ISO-Entities.dtd
          2005-01-28 10:24:09,227 [DEBUG] [file] - Creating InputSource at: file:C:/Vignette/runtime_services/8.1/install/common/nodemanager/VgnVCMServer/stage/pims-hansard/pims-hansard.war/WEB-INF/classes/com/morse/pims/cms/feed/sax/ISO-Entities.dtd
          2005-01-28 10:24:09,718 [WARN ] [file] - org.xml.sax.SAXParseException: Element type "Hansard" must be declared.
          org.xml.sax.SAXParseException: Element type "Session" must be declared.
          org.xml.sax.SAXParseException: Element type "DailyRecord" must be declared.
          org.xml.sax.SAXParseException: Element type "Volume" must be declared.
          org.xml.sax.SAXParseException: Element type "Written" must be declared.
          org.xml.sax.SAXParseException: Element type "WrittenHeading" must be declared.
          org.xml.sax.SAXParseException: Element type "Introduction" must be declared.
          … continues for all the elements in the doc
          2005-01-28 10:24:10,519 [DEBUG] [file] - XML file is valid XML? false
          2005-01-28 10:24:10,519 [WARN ] [file] - Daily Part file 'cw501205.wa1.xml' was not valid XML and was not processed.
          Has anybody seen this behavior before with weblogic and if so how have you resolved the issue.
          Thanks in Advance
          Adam

Answer 1

It looks like you clicked on "Post" before you got around to explaining your problem. I don't see any error messages or any description of what was supposed to happen and what happened instead.
Now, I don't know anything about XML Schema, but just guessing at how that unique name feature might be designed, and just guessing that your unique name is actually in the <userId> element, I would suggest that this:
<xsd:unique name="un_name"> 
  <xsd:selector xpath="USER"/> 
  <xsd:field xpath="."/> 
</xsd:unique> is at fault because it doesn't mention the <userId> element anywhere.