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From "Bill Herbert (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2423) NullPointerException when attemping to add a new document to an instance of IndexWriter
Date Thu, 29 Apr 2010 23:19:53 GMT
NullPointerException when attemping to add a new document to an instance of IndexWriter
---------------------------------------------------------------------------------------

                 Key: LUCENE-2423
                 URL: https://issues.apache.org/jira/browse/LUCENE-2423
             Project: Lucene - Java
          Issue Type: Bug
          Components: Index
    Affects Versions: 3.0.1
         Environment: Windows Vista Home Premium, Lucene version 3.0.1, JRE6, org.apache.commons.digester.Digester,
org.apache.lucene.index.IndexWriter 
            Reporter: Bill Herbert
             Fix For: 3.0.1


I'm attempting to run Listing #4 from "Parsing, Indexing, and Searching XML with Digester
and Lucene"  <https://www.ibm.com/developerworks/library/j-lucene/> .  Using this code
(with minor modifications), I am able to read and parse an XML input file and create a document
to be indexed.  However, attempting to index the document with an instance of IndexWriter
(using the statement: writer.addDocument(contactDocument);) causes a NullPointerException
with the following messages:

Apr 29, 2010 2:57:32 PM org.apache.commons.digester.Digester endElement
SEVERE: End event threw exception
java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.apache.commons.beanutils.MethodUtils.invokeMethod(MethodUtils.jav
a:282)
        at org.apache.commons.digester.SetNextRule.end(SetNextRule.java:217)
        at org.apache.commons.digester.Rule.end(Rule.java:253)
        at org.apache.commons.digester.Digester.endElement(Digester.java:1332)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endEleme
nt(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l.scanEndElement(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l$FragmentContentDriver.next(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(U
nknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l.scanDocument(Unknown Source)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(U
nknown Source)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(U
nknown Source)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown So
urce)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Un
known Source)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.p
arse(Unknown Source)
        at org.apache.commons.digester.Digester.parse(Digester.java:1842)
        at DigesterMarriesLucene.main(DigesterMarriesLucene.java:94)
Caused by: java.lang.NullPointerException
        at DigesterMarriesLucene.addContact(DigesterMarriesLucene.java:46)
        ... 20 more
Exception in thread "main" java.lang.NullPointerException
        at org.apache.commons.digester.Digester.createSAXException(Digester.java
:3333)
        at org.apache.commons.digester.Digester.createSAXException(Digester.java
:3359)
        at org.apache.commons.digester.Digester.endElement(Digester.java:1335)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endEleme
nt(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l.scanEndElement(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l$FragmentContentDriver.next(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(U
nknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l.scanDocument(Unknown Source)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(U
nknown Source)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(U
nknown Source)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown So
urce)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Un
known Source)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.p
arse(Unknown Source)
        at org.apache.commons.digester.Digester.parse(Digester.java:1842)
        at DigesterMarriesLucene.main(DigesterMarriesLucene.java:94)
Caused by: java.lang.NullPointerException
        at DigesterMarriesLucene.addContact(DigesterMarriesLucene.java:46)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.apache.commons.beanutils.MethodUtils.invokeMethod(MethodUtils.jav
a:282)
        at org.apache.commons.digester.SetNextRule.end(SetNextRule.java:217)
        at org.apache.commons.digester.Rule.end(Rule.java:253)
        at org.apache.commons.digester.Digester.endElement(Digester.java:1332)
        ... 12 more

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