Hi all,
I know this probably seems like an uninteresting problem and smells, even
to me, like a stupid/newbie mis-configuration [Yes. I am reading the
excellent solr in action and trying my hand at applying the "suggestion
examples"], but I looked a bit into this tonight, fired up the debugger,
stepped through code, etc to try to find where I erred: to no avail.
Some questions:
First, does the SpellCheck component's "FSTLookupFactory" require any extra
special configuration, e.g. term vectors for the field ("suggest" below),
etc.:
<str
name="lookupImpl">org.apache.solr.spelling.suggest.fst.FSTLookupFactory</str>
<str name="field">suggest</str>
Second, why does the FSTCompletionLookup not check for nulls here for these
variables: higherWeightsCompletion and normalCompletion? Wo
if (higherWeightsFirst) {
completions = higherWeightsCompletion.lookup(key, num);
} else {
completions = normalCompletion.lookup(key, num);
}
[Stepping through the code, I saw it execute this constructor:
/**
* This constructor prepares for creating a suggested FST using the
* {@link #build(TermFreqIterator)} method.
*
* @param buckets
* The number of weight discretization buckets (see
* {@link FSTCompletion} for details).
*
* @param exactMatchFirst
* If <code>true</code> exact matches are promoted to the top of
the
* suggestions list. Otherwise they appear in the order of
* discretized weight and alphabetical within the bucket.
*/
public FSTCompletionLookup(int buckets, boolean exactMatchFirst) {
This constructor never initializes the two *Completion variables ]
Third: I got inconsistent results. If I started solr afresh: this error
appeared. If I reindexed my test site, then executed my 'problematic
searches' , the problem went away. Why would this happen
Thanks in advance
On Wed, Jun 4, 2014 at 9:32 AM, Will Milspec <will.mils...@gmail.com> wrote:
> Hi all,
>
> Someone posted this problem over a year ago but I did not see a clear
> resolution in the thread.
>
> Intermittently--i.e. for some searches, not others--the
> 'suggest/spellcheck' component throws a n NullPointerException (NPE) when a
> user executes a search. It fails on FSTCompletionLookup (line 244)
>
> I'm using solr 4.4. ( I'm using 4.4 to match "what's in production")I
> could upgrade if necessary. )
>
> Any hints on why it occurs and how to fix? The earlier post alluded to
> "changing the field type solved the problem", but did not provide details.
>
> Thanks
>
> will
>
> /select request handler:
> ========================
>
> <str name="spellcheck">on</str>
> <str name="spellcheck.dictionary">suggestDictionary</str>
> <str name="spellcheck.extendedResults">false</str>
> <str name="spellcheck.count">5</str>
> <str name="spellcheck.alternativeTermCount">2</str>
> <str name="spellcheck.maxResultsForSuggest">5</str>
> <str name="spellcheck.collate">true</str>
> <str name="spellcheck.collateExtendedResults">true</str>
> <str name="spellcheck.maxCollationTries">5</str>
> <str name="spellcheck.maxCollations">3</str>
>
> spellcheck component:
> ========================
>
> <searchComponent class="solr.SpellCheckComponent" name="suggest">
> <lst name="spellchecker">
> <str name="name">suggestDictionary</str>
> <str
> name="classname">org.apache.solr.spelling.suggest.Suggester</str>
> <str
> name="lookupImpl">org.apache.solr.spelling.suggest.fst.FSTLookupFactory</str>
> <str name="field">title</str>
> <!-- <str name="field">suggest</str> -->
> <float name="threshold">0.</float>
> <str name="buildOnCommit">true</str>
> </lst>
> </searchComponent>
>
> field type definition:
> ========================
>
> <fieldType name="text_general" class="solr.TextField"
> positionIncrementGap="100">
> <analyzer type="index">
> <tokenizer class="solr.StandardTokenizerFactory"/>
> <!-- Use EdgeNGramFilter for wildcard search -->
> <filter class="solr.StopFilterFactory" ignoreCase="true"
> words="stopwords.txt" />
> <!-- in this example, we will only use synonyms at query time
> <filter class="solr.SynonymFilterFactory"
> synonyms="index_synonyms.txt" ignoreCase="true" expand="false"/>
> -->
> <filter class="solr.LowerCaseFilterFactory"/>
> </analyzer>
> <analyzer type="query">
> <tokenizer class="solr.StandardTokenizerFactory"/>
> <filter class="solr.StopFilterFactory" ignoreCase="true"
> words="stopwords.txt" />
> <filter class="solr.SynonymFilterFactory" synonyms="synonyms.txt"
> ignoreCase="true" expand="true"/>
> <filter class="solr.LowerCaseFilterFactory"/>
> </analyzer>
> </fieldType>
>
> field definition:
> ========================
>
> <field name="title" type="text_general" indexed="true" stored="true"
> multiValued="false" omitNorms="false"/>
>
> It fails here:
> ===============
> Here's the line that fails.
>
> @Override
> public List<LookupResult> lookup(CharSequence key, boolean
> higherWeightsFirst, int num) {
> final List<Completion> completions;
> if (higherWeightsFirst) {
> completions = higherWeightsCompletion.lookup(key, num);
> } else {
> completions = normalCompletion.lookup(key, num); <-- fails on this
> line
>
> }
>
>
