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https://issues.apache.org/jira/browse/LUCENE-1399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12633177#action_12633177
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Michael McCandless commented on LUCENE-1399:
--------------------------------------------
Thanks for reporting this!
It should already be fixed on 2.4 (this is a dup of LUCENE-1335). Could you
run your test program on 2.4 to confirm?
> NullPointerException issue with single IndexWriter instance shared among
> multiple Thread
> ----------------------------------------------------------------------------------------
>
> Key: LUCENE-1399
> URL: https://issues.apache.org/jira/browse/LUCENE-1399
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Affects Versions: 2.3.2
> Environment: Windows XP, JDK 1.6
> Reporter: Rudi Quark
>
> NullPointerException is thrown while indexing within multiple threads but
> using one single IndexWriter instance. According to "Lucene in Action" this
> should do: "...a single instance of either class can be shared among multiple
> threads, and all calls to its index-modifying methods will be properly
> synchronized so that index modifications are executed one after the other."
> Following my exception trace:
> java.lang.NullPointerException
> at
> org.apache.lucene.index.IndexFileDeleter.decRef(IndexFileDeleter.java:475)
> at
> org.apache.lucene.index.IndexWriter.commitTransaction(IndexWriter.java:1986)
> at org.apache.lucene.index.IndexWriter.addIndexes(IndexWriter.java:2219)
> at
> com.shi.marketingspy.test.SHILuceneWritingFromThreadsTest$testthread.run(SHILuceneWritingFromThreadsTest.java:48)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
> at java.lang.Thread.run(Thread.java:619)
> Following my test program:
> package com.shi.marketingspy.test;
> import org.apache.lucene.analysis.Analyzer;
> import org.apache.lucene.document.Document;
> import org.apache.lucene.document.Field;
> import org.apache.lucene.document.Field.Store;
> import org.apache.lucene.index.IndexWriter;
> public class SHILuceneWritingFromThreadsTest
> {
> public static void log(String s, com.shi.jipmisc misc)
> {
> misc.__Log(s);
> }
> public static class testthread implements Runnable
> {
> public org.apache.lucene.index.IndexWriter indexwriter;
> public int iThread;
> public boolean bWithOptimize;
> public com.shi.jipmisc misc;
> public testthread(org.apache.lucene.index.IndexWriter
> indexwriter, int iThread, boolean bWithOptimize, com.shi.jipmisc misc)
> {
> this.indexwriter = indexwriter;
> this.iThread = iThread;
> this.bWithOptimize = bWithOptimize;
> this.misc = misc;
> }
> public void run()
> {
> try
> {
> Analyzer anal = new
> com.shi.lucene.index.SHIAnalyser(null,null);
> org.apache.lucene.store.Directory tmpidxdirectory
> = new org.apache.lucene.store.RAMDirectory();
> org.apache.lucene.index.IndexWriter tempindexwriter =
> new IndexWriter(tmpidxdirectory, anal, true);
> Document doc = new Document();
> for(int ifld=0; ifld < 9; ifld++)
> {
> doc.add(new Field("field_"+ifld, "iThread:
> "+iThread+" field: "+ifld+" "+System.currentTimeMillis()+"
> "+misc.getDateString()+" "+misc.getDateString2()+"
> "+com.shi.jipmisc.getTimeStamp()+" "+misc.getClass()+" "+misc.getDebug(),
> Store.COMPRESS, Field.Index.UN_TOKENIZED));
> }
> tempindexwriter.addDocument(doc);
> tempindexwriter.optimize();
> org.apache.lucene.store.Directory[] idxs = new
> org.apache.lucene.store.Directory[1];
> idxs[0] = tmpidxdirectory;
> //todo: del-call...
> this.indexwriter.addIndexes(idxs);
> if (this.bWithOptimize)
> this.indexwriter.optimize();
> }
> catch(Throwable e)
> {
>
> log("testthread:run\tERR:2(bWithOpti:"+bWithOptimize+")(iThread:"+iThread+"):"+e.getMessage()+"\n\t"+com.shi.jipmisc.stack2string(e),
> misc);
> }
> }
> }
> public SHILuceneWritingFromThreadsTest()
> {
> }
> public static void main(String[] args)
> {
> testluceneconcurrency(false);
> testluceneconcurrency(true );
> }
> public static java.util.concurrent.ExecutorService threadpool_optimized
> = java.util.concurrent.Executors.newFixedThreadPool(9999999);
> public static java.util.concurrent.ExecutorService
> threadpool_not_optimized =
> java.util.concurrent.Executors.newFixedThreadPool(9999999);
> public static void testluceneconcurrency(boolean bWithOptimize)
> {
> com.shi.jipmisc.createDir("temp", "c:");
> com.shi.jipmisc.createDir("testluceneconcurrency", "c:/temp");
> com.shi.jipmisc.createDir(""+bWithOptimize,
> "c:/temp/testluceneconcurrency");
> com.shi.jipmisc misc = new com.shi.jipmisc();
> misc.setMyPath("C:/temp/testluceneconcurrency");
> misc.setDebug(true);
> misc.emptyDir("c:/temp/testluceneconcurrency/"+bWithOptimize);
> Analyzer anal = new com.shi.lucene.index.SHIAnalyser(null,null);
> org.apache.lucene.index.IndexWriter indexwriter = null;
> try
> {
> indexwriter = new
> IndexWriter("c:/temp/testluceneconcurrency/"+bWithOptimize, anal, true);
> }
> catch(Throwable e)
> {
>
> log("SHILuceneWritingFromThreadsTest:testluceneconcurrency\tERR:0("+bWithOptimize+"):"+e.getMessage(),
> misc);
> return;
> }
>
> log("SHILuceneWritingFromThreadsTest:testluceneconcurrency\tINF:step0("+bWithOptimize+")(BEGIN)-------------------------------------",
> misc);
> for(int idoc=0; idoc < 9999; idoc++)
> {
> Document doc = new Document();
> for(int ifld=0; ifld < 9; ifld++)
> {
> doc.add(new Field("field_"+ifld, "doc: "+idoc+"
> field: "+ifld+" "+System.currentTimeMillis()+" "+misc.getDateString()+"
> "+misc.getDateString2()+" "+com.shi.jipmisc.getTimeStamp()+"
> "+misc.getClass()+" "+misc.getDebug(), Store.COMPRESS,
> Field.Index.UN_TOKENIZED));
> }
> try
> {
> indexwriter.addDocument(doc);
> }
> catch(Throwable e)
> {
>
> log("SHILuceneWritingFromThreadsTest:testluceneconcurrency\tERR:1("+bWithOptimize+"):"+e.getMessage(),
> misc);
> return;
> }
> }
>
> log("SHILuceneWritingFromThreadsTest:testluceneconcurrency\tINF:step1("+bWithOptimize+")",
> misc);
> try
> {
> indexwriter.optimize();
> }
> catch(Throwable e)
> {
>
> log("SHILuceneWritingFromThreadsTest:testluceneconcurrency\tERR:2("+bWithOptimize+"):"+e.getMessage(),
> misc);
> return;
> }
>
> log("SHILuceneWritingFromThreadsTest:testluceneconcurrency\tINF:step2("+bWithOptimize+")",
> misc);
> java.util.concurrent.ExecutorService threadpool = bWithOptimize
> ? threadpool_optimized : threadpool_not_optimized;
> for(int it=0; it < 999; it++)
> {
> threadpool.execute(new testthread(indexwriter, it,
> bWithOptimize, misc));
> }
>
> log("SHILuceneWritingFromThreadsTest:testluceneconcurrency\tINF:step3("+bWithOptimize+")",
> misc);
> threadpool.shutdown(); //=execute threads and wait til all
> threads finish
> com.shi.jipmisc.wait(999, misc);
>
> log("SHILuceneWritingFromThreadsTest:testluceneconcurrency\tINF:step4("+bWithOptimize+")",
> misc);
> try
> {
> //indexwriter.optimize();
> //indexwriter.close();
> }
> catch(Throwable e)
> {
>
> log("SHILuceneWritingFromThreadsTest:testluceneconcurrency\tERR:9("+bWithOptimize+"):"+e.getMessage(),
> misc);
> return;
> }
>
> log("SHILuceneWritingFromThreadsTest:testluceneconcurrency\tINF:step5("+bWithOptimize+")(END)-----------------------------",
> misc);
> }
> }
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