Hello,
Try setting the systemId on the LSInput by adding the line
"ret.setSystemId(systemId);" to the resolveResource() method of
TestResolver, just before the return statement. That solved the problem
for me when I ran your test.
Xerces' XIncludeHandler checks for recursive includes by doing String
comparison on the full pathnames of included resources (including a path
that was included before will lead to an infinite recursion of includes).
Because of this, it needs a String version of location of the included
resource, which it gets from the systemId of the InputSource.
However, it's bad form for the XIncludeHandler to throw a
NullPointerException instead of a useful error. I'll file a bug about
that.
Cheers,
--
Peter McCracken
XML Parser Development
IBM Toronto Lab
Email: peterjm@xxxxxxxxxx
alexius@xxxxxxxxxxx wrote on 03/14/2006 09:14:44 AM:
> Hi,
>
> I'm running into problems when using xinclude with my own
> LSResourceResolver. I want to catch the call to the resolver and
> return my own LSInput that the parser should use for retrieving the
> included contents. What I really want is to filter the included file
> myself before letting the parser see it but it fails even for the
> simple example provided below. I get the following
> NullPointerException:
>
> java.lang.NullPointerException
> at
>
org.apache.xerces.xinclude.XIncludeHandler.searchForRecursiveIncludes(Unknown
> Source)
> at
> org.apache.xerces.xinclude.XIncludeHandler.startDocument(Unknown
> Source)
> at
> org.apache.xerces.impl.dtd.XMLDTDValidator.startDocument(Unknown
> Source)
> at
> org.apache.xerces.impl.XMLDocumentScannerImpl.startEntity(Unknown
> Source)
> at
> org.apache.xerces.impl.XMLVersionDetector.startDocumentParsing(Unknown
> Source)
> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
> at
> org.apache.xerces.xinclude.XIncludeHandler.handleIncludeElement(Unknown
> Source)
> at
org.apache.xerces.xinclude.XIncludeHandler.emptyElement(Unknown
> Source)
> at
> org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown
> Source)
> at
> org.apache.xerces.impl.
>
XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
> Source)
> at
>
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
> Source)
> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
> at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
> at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
> at org.apache.xerces.parsers.DOMParserImpl.parse(Unknown Source)
> at Error.main(Error.java:44)
>
>
> Letting the resolver return null and thereby let the default handler
take
> care of the include works just fine in the example below. I'm using
xerces
> 2.8.0 and jsdk 1.4.2 and 1.5.
>
> Anyone got a clue what I'm missing?
>
> Many thanks in advance,
>
> /Per
>
>
>
> ================
> Example class 'Error.java'
>
> run
>
> java Error err.xml
>
> in order to reproduce the error.
>
> ================
> import java.io.FileInputStream;
> import java.io.FileNotFoundException;
> import java.io.IOException;
> import java.net.MalformedURLException;
> import java.net.URL;
> import org.w3c.dom.Document;
> import org.w3c.dom.DOMError;
> import org.w3c.dom.DOMErrorHandler;
> import org.w3c.dom.bootstrap.DOMImplementationRegistry;
> import org.w3c.dom.ls.DOMImplementationLS;
> import org.w3c.dom.ls.LSException;
> import org.w3c.dom.ls.LSInput;
> import org.w3c.dom.ls.LSOutput;
> import org.w3c.dom.ls.LSParser;
> import org.w3c.dom.ls.LSResourceResolver;
>
>
> public class Error {
> public static void main(String[] args) {
> if (args.length != 1) {
> System.out.println("Usage: java Error <instance file>");
> System.exit(0);
> }
> String instanceFile = args[0];
> try {
> System.setProperty(DOMImplementationRegistry.PROPERTY,
> "org.apache.xerces.dom.DOMImplementationSourceImpl");
> DOMImplementationRegistry registry =
> DOMImplementationRegistry.newInstance();
> final DOMImplementationLS domImplementationLS =
> (DOMImplementationLS)registry.getDOMImplementation("LS");
> LSParser parser =
> domImplementationLS.createLSParser(DOMImplementationLS.
> MODE_SYNCHRONOUS,
> "http://www.w3.org/2001/XMLSchema";);
> parser.getDomConfig().setParameter("http://apache.
> org/xml/features/xinclude",
> Boolean.TRUE);
> parser.getDomConfig().setParameter("resource-resolver",
> new TestResolver(domImplementationLS));
> parser.getDomConfig().setParameter("error-handler", new
> DOMErrorHandler() {
> public boolean handleError(DOMError error) {
> ((Exception)error.getRelatedException()).printStackTrace();
> throw new LSException(LSException.PARSE_ERR, error.
> getMessage());
> }
> });
>
> LSInput input = domImplementationLS.createLSInput();
> LSOutput output = domImplementationLS.createLSOutput();
> input.setByteStream(new FileInputStream(instanceFile));
> output.setByteStream(System.out);
> Document doc = parser.parse(input);
> domImplementationLS.createLSSerializer().write(doc, output);
> System.err.println();
> } catch (ClassNotFoundException e) {
> System.err.println("Unable to find DOM Parser: " +
e.getMessage());
> System.exit(1);
> } catch (InstantiationException e) {
> System.err.println("Unable to find DOM Parser: " +
e.getMessage());
> System.exit(1);
> } catch (IllegalAccessException e) {
> System.err.println("Unable to find DOM Parser: " +
e.getMessage());
> System.exit(1);
> } catch (FileNotFoundException e) {
> System.err.println("Unable to find file: " + instanceFile);
> System.exit(1);
> }
> catch (Throwable t) {
> t.printStackTrace();
> System.exit(1);
> }
> }
> }
>
> class TestResolver implements LSResourceResolver {
> private DOMImplementationLS domImplementationLS;
>
> public TestResolver(DOMImplementationLS domImplementationLS) {
> this.domImplementationLS = domImplementationLS;
> }
>
> public LSInput resolveResource(String type,
> String namespaceURI,
> String publicId,
> String systemId,
> String baseURI) {
> System.err.println("==== Resolving '" + type + "' '" +
namespaceURI +
> "' '" +
> publicId + "' '" + systemId + "' '" + baseURI + "'");
>
> LSInput ret = domImplementationLS.createLSInput();
> FileInputStream is = null;
> try {
> is = new FileInputStream((new URL(systemId)).getPath());
> } catch (IOException e) {
> e.printStackTrace();
> System.exit(1);
> }
> ret.setByteStream(is);
> return ret;
> // return null;
> }
> }
>
> ====================
> Example xml file 'err.xml'
> ====================
> <?xml version="1.0"?>
> <elem xmlns:xi="http://www.w3.org/2001/XInclude";>
> <xi:include href="file:errinclude.xml"/>
> </elem>
>
> ====================
> Example xml file 'errinclude.xml'
> ====================
> <anotherElement>Some text for example</anotherElement>
>
>
>
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