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From Liaqat Ali <liaqatalim...@gmail.com>
Subject Re: Errors while running LIA code.
Date Thu, 06 Dec 2007 10:06:01 GMT
Michael McCandless wrote:
> See this thread for one suggestion:
>
>     http://www.gossamer-threads.com/lists/lucene/java-user/55465
>
> Mike
>
> "Liaqat Ali" <liaqatalimian@gmail.com> wrote:
>   
>> Hi
>>
>> I am trying to run a code from Lucene In Action, but it generate some 
>> errors.There is one one warning at compilation time and the errors 
>> generate at run time. Given below the code and errors. Kindly give me 
>> some clue. thanks...
>>
>> *_Code:_*
>>
>> ///package lia.handlingtypes.xml;
>> import lia.handlingtypes.framework.DocumentHandler;
>> import lia.handlingtypes.framework.DocumentHandlerException;
>> 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;
>> import java.io.File;
>> import java.io.IOException;
>> import java.io.InputStream;
>> import java.io.FileInputStream;
>> import java.util.Iterator;
>> import java.util.HashMap;
>>
>> public class SAXXMLHandler
>>   extends DefaultHandler implements DocumentHandler {
>>
>>   /** A buffer for each XML element */
>>   private StringBuffer elementBuffer = new StringBuffer();
>>   private HashMap attributeMap;
>>
>>   private Document 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(attName, 
>> attValue,Field.Store.YES,Field.Index.TOKENIZED));
>>       }
>>     }
>>     else {
>>       doc.add(new Field(qName, 
>> elementBuffer.toString(),Field.Store.YES,Field.Index.TOKENIZED));
>>     }
>>   }
>>
>>   public static void main(String args[]) throws Exception {
>>     SAXXMLHandler handler = new SAXXMLHandler();
>>
>>     //File file = new File ("d:\\addressbook.xml");
>>
>>     Document doc = handler.getDocument(new FileInputStream(new 
>> File(args[0])));
>>
>>     //Document doc = handler.getDocument(new FileInputStream(file));
>>
>>     System.out.println(doc);
>>   }
>> }
>> /
>>
>> _*Errors:
>>
>> *_/D:\>java SAXXMLHandler d:\addressbook.xml
>>
>> Exception in thread "main" java.lang.NullPointerException
>>         at SAXXMLHandler.startElement(SAXXMLHandler.java:66)
>>         at 
>> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startEle
>> ment(Unknown Source)
>>         at 
>> com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.startElem
>> ent(Unknown Source)
>>         at 
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
>> l.scanStartElement(Unknown Source)
>>         at 
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$Conten
>> tDriver.scanRootElementHook(Unknown Source)
>>         at 
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
>> l$FragmentContentDriver.next(Unknown Source)
>>         at 
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$Prolog
>> Driver.next(Unknown Source)
>>         at 
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(U
>> nknown Source)
>>         at 
>> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
>> l.scanDocument(Unknown Source)
>>         at 
>> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(U
>> nknown Source)
>>         at 
>> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(U
>> nknown Source)
>>         at 
>> com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown So
>> urce)
>>         at 
>> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Un
>> known Source)
>>         at 
>> com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.p
>> arse(Unknown Source)
>>         at javax.xml.parsers.SAXParser.parse(Unknown Source)
>>         at javax.xml.parsers.SAXParser.parse(Unknown Source)
>>         at SAXXMLHandler.getDocument(SAXXMLHandler.java:39)
>>         at SAXXMLHandler.main(SAXXMLHandler.java:102)
>> /_*
>> *_
>>
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>>
>>     
>
> ---------------------------------------------------------------------
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>
>
>   
Hello, Still facing the same problem after making the suggested change.  
What would be a solution for this?

Liaqat

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