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From "f (JIRA)" <>
Subject [jira] Commented: (LUCENE-632) The creation of a spell index from a LuceneDictionary via SpellChecker.indexDictionary (Dictionary dict) fails starting with 1.9.1 (up to current svn version)
Date Wed, 27 Dec 2006 13:10:24 GMT
    [ ] 
f commented on LUCENE-632:

i still have the problem with null pointer exceptions on creating a spell index ... first
i thought its a problem with the php jni bridge i use. But after i created a java example
it didnt work either. For preventing parametre missspellings or something like this i hardcoded
the values in the example.

import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;

public class DidYouMeanIndexer {

    private static final String DEFAULT_FIELD = "txt_name";
    public void createSpellIndex() throws IOException
        IndexReader indexReader = null;
        {   boolean create = false;
            Directory orgindex = FSDirectory.getDirectory("/var/www/localhost/htdocs/lib/suche/data/index/",
            Directory spellindex = FSDirectory.getDirectory("/var/www/localhost/htdocs/lib/suche/data/didyoumean/",
            indexReader =;
            new IndexWriter(orgindex, null, true).close();
            Dictionary dictionary = new LuceneDictionary(indexReader, "txt_name");
            SpellChecker spellChecker = new SpellChecker(spellindex);
        {   if (indexReader != null)
            {   indexReader.close();

    public static void main(String[] args)
        DidYouMeanIndexer obj = new DidYouMeanIndexer();
        {     obj.createSpellIndex();
        catch(IOException exception)

The next step i did was debugging the behaviour of the worditerator which i got from the LuceneDictionary.
But it didnt get a word. The index is well set up with one document in it with two fields.
The txt_name field is tokened indexed and has a termvector. The solution of Karl Wettin didnt
the job for me ;)                                                                        

This problem exists on my system with lucene 1.9.1 and with 2.0.1-dev

I hope you have some ideas ;)

> The creation of a spell index from a LuceneDictionary via SpellChecker.indexDictionary
(Dictionary dict) fails starting with 1.9.1 (up to current svn version)
> --------------------------------------------------------------------------------------------------------------------------------------------------------------
>                 Key: LUCENE-632
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Other
>    Affects Versions: 1.9, 2.0.0
>            Reporter: Karsten Dello
>            Priority: Minor
>             Fix For: 2.0.0
>         Attachments: lazy_searcher.diff
> Two different errors in 1.9.1/2.0.0 and current svn version.
> 1.9.1/2.0.0:
> at the end of indexDictionary (Dictionary dict) 
> the IndexReader-instance reader is closed.
> This causes a NullpointerException because reader has not been initialized before (neither
in that method nor in the constructor).
> Uncommenting this line (reader.close()) seems to resolve that issue.
> current svn:
> the constructor tries to create an IndexSearcher-instance for the specified path;
> as there is no index in that path - it is not created yet -  an exception is thrown.

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