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.scanStartEleme
nt(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
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