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From "Bill Herbert (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2423) NullPointerException when attemping to add a new document to an instance of IndexWriter
Date Sun, 02 May 2010 04:13:56 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12863091#action_12863091
] 

Bill Herbert commented on LUCENE-2423:
--------------------------------------

Thanks for your follow-up on this

Following your observation that I might have writer==NULL, I did some checking and found:
1) An instance of writer is created in main()
2) A directory is created for its use
3) Initially, there are no documents in this directory
4) Within addContact(), a contactDocument object is created for the type "Individual"
5) After adding name, address, etc. fields to contactDocument, there is no output from the
statements:
     System.out.println("Within addContact(), Print name of Directory used by writer: " +
writer.getDirectory());
     System.out.println("Statement in addContact() just prior to 'writer.adddocument', number
of documents in contactDocument: " + writer.numDocs());
6) Finally, an NPE is caused by the statement: writer.addDocument(contactDocument);

The complete class listing is attached along with a small input file.
FYI, included in my classpath are:
lucene-core-3.0.1.jar
commons-digester-2.0.jar
commons-beanutils-1.8.3.jar
commons-logging-1.1.1.jar

Bill

> 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
>
>         Attachments: address-book.xml, DigesterMarriesLucene.java
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> 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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