[LUCENE-2423] NullPointerException when attemping to add a new document to an instance of IndexWriter

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Affects Version/s: 3.0.1
• Fix Version/s: 3.0.1
• Component/s: core/index

Environment

Windows Vista Home Premium, Lucene version 3.0.1, JRE6, org.apache.commons.digester.Digester, org.apache.lucene.index.IndexWriter

• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Bill Herbert
• Created: 29/Apr/10 23:18
• Updated: 28/Aug/22 12:25
• Resolved: 02/May/10 04:58

Description

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