NullPointerException when attemping to add a new document to an instance of
IndexWriter
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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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