I think you need to initialize attributeMap, eg add " = new HashMap()" in
the declaration?
Mike
"syedfa" <[EMAIL PROTECTED]> wrote:
>
> Dear Fellow Java & Lucene developers:
>
> I am a Java developer learning lucene and I am currently going through the
> book Lucene in Action. At present, I am trying to run the sample code for
> indexing an xml document using sax. My code has been slightly updated for
> Lucene version 2.2:
>
> /*
> * To change this template, choose Tools | Templates
> * and open the template in the editor.
> */
>
> package lucenexml;
>
>
> import java.io.File;
> import java.io.FileInputStream;
> import java.io.InputStream;
> import java.io.IOException;
> import java.util.HashMap;
> import java.util.Iterator;
>
> import org.xml.sax.helpers.DefaultHandler;
> import org.xml.sax.SAXException;
> import org.xml.sax.Attributes;
>
> import javax.xml.parsers.SAXParser;
> import javax.xml.parsers.SAXParserFactory;
> import javax.xml.parsers.ParserConfigurationException;
>
>
> import org.apache.lucene.document.Document;
> import org.apache.lucene.document.Field;
>
> /**
> *
> * @author fayyaz
> */
> public class SAXXMLHandler extends DefaultHandler implements
> DocumentHandler{
>
> private StringBuffer elementBuffer=new StringBuffer();
> private HashMap attributeMap;
>
> private Document doc;
> /**
> * @param args the command line arguments
> */
> public static void main(String[] args) throws Exception {
> // TODO code application logic here
> SAXXMLHandler handler=new SAXXMLHandler();
> Document doc=handler.getDocument(new FileInputStream(new
> File(args[0])));
> System.out.println(doc);
> }
>
> public Document getDocument(InputStream is) throws
> DocumentHandlerException{
>
> SAXParserFactory spf=SAXParserFactory.newInstance();
>
> try{
> SAXParser parser=spf.newSAXParser();
> parser.parse(is, this);
>
> }
> catch (IOException e){
> throw new DocumentHandlerException("Cannot parse XML
> document",
> e);
> }
> catch (ParserConfigurationException e) {
> throw new DocumentHandlerException("Cannot parse XML
> document",
> e);
> }
> catch (SAXException e){
> throw new DocumentHandlerException("Cannot parse XML
> document",
> e);
> }
> return doc;
> }
>
> public void startDocument(){
> doc=new Document();
> }
>
> public void startElement(String uri, String localName, String qName,
> Attributes atts) throws SAXException{
>
> elementBuffer.setLength(0);
> attributeMap.clear();
> if(atts.getLength()>0){
> attributeMap=new HashMap();
> for(int i=0; i<atts.getLength(); i++){
> attributeMap.put(atts.getQName(i), atts.getValue(i));
> }
> }
> }
>
> public void characters(char[] text, int start, int length){
> elementBuffer.append(text, start, length);
> }
>
> public void endElement(String uri, String localName, String qName)
> throws SAXException{
> if(qName.equals("address-book")){
> return;
> }
>
> else if(qName.equals("contact")){
> Iterator iter=attributeMap.keySet().iterator();
> while(iter.hasNext()){
> String attName=(String)iter.next();
> String attValue=(String)attributeMap.get(attName);
> doc.add(new Field(qName, elementBuffer.toString(),
> Field.Store.YES,Field.Index.NO));
> }
> }
> }
> }
>
>
> However, although the code compiles, I get the following runtime error
> when
> I pass the file addressbook.xml (which is used in the book) as a runtime
> argument:
>
> Exception in thread "main" java.lang.NullPointerException
> at lucenexml.SAXXMLHandler.startElement(SAXXMLHandler.java:81)
> at
> org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown
> Source)
> at
> org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(Unknown
> Source)
> at
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown
> Source)
> at
> org.apache.xerces.impl.XMLDocumentScannerImpl$ContentDispatcher.scanRootElementHook(Unknown
> Source)
> at
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$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.AbstractSAXParser.parse(Unknown
> Source)
> at
> org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown
> Source)
> at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown Source)
> at javax.xml.parsers.SAXParser.parse(SAXParser.java:198)
> at lucenexml.SAXXMLHandler.getDocument(SAXXMLHandler.java:59)
> at lucenexml.SAXXMLHandler.main(SAXXMLHandler.java:49)
> Java Result: 1
>
> What am I doing wrong? Any help would be greatly appreciated.
>
> Thanks in advance.
> Sincerely;
> Fayyaz
>
> --
> View this message in context:
> http://www.nabble.com/Error-running-Lucene-in-Action-code-tf4947242.html#a14164565
> Sent from the Lucene - Java Users mailing list archive at Nabble.com.
>
>
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