Frank Steggink created SOLR-10395:
-------------------------------------
Summary: NPE during spell check with result collation
Key: SOLR-10395
URL: https://issues.apache.org/jira/browse/SOLR-10395
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: spellchecker
Affects Versions: 6.2.1
Reporter: Frank Steggink
I'm getting a NullPointerException when using collation during spell check.
This is the message I'm getting: Exception trying to re-query to check if a
spell check possibility would return any hits.
Stack trace:
2017-03-13 13:05:54.618 WARN (qtp472654579-84) [c:locatieserver s:dkk
r:core_node4 x:locatieserver_dkk_replica2] o.a.s.s.SpellCheckCollator Exception
trying to re-query to check if a spell check possibility would return any hits.
java.lang.NullPointerException
at
org.apache.solr.spelling.SpellCheckCollator.collate(SpellCheckCollator.java:150)
at
org.apache.solr.handler.component.SpellCheckComponent.addCollationsToResponse(SpellCheckComponent.java:297)
at
org.apache.solr.handler.component.SpellCheckComponent.process(SpellCheckComponent.java:209)
at
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:295)
at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:154)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:2089)
...
My spell check config for this search handler:
<str name="spellcheck">on</str>
<str name="spellcheck.dictionary">suggest</str>
<str name="spellcheck.extendedResults">false</str>
<str name="spellcheck.count">5</str>
<str name="spellcheck.alternativeTermCount">2</str>
<str name="spellcheck.maxResultsForSuggest">3</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>
The field "suggest" is a field in the index, which is also (usually) queried
with this search handler. The field is filled with lots of data created by edge
ngrams, since it's intended usage is for an autocomplete field.
This issue is very similar to SOLR-8807, but the NPE is occurring one line in
the code later
(solr\core\src\java\org\apache\solr\spelling\SpellCheckCollator.java). As a
result the patch attached to that issue probably won't work in my case.
try {
queryComponent.prepare(checkResponse);
if (docCollectionLimit > 0) {
int f = checkResponse.getFieldFlags();
checkResponse.setFieldFlags(f |=
SolrIndexSearcher.TERMINATE_EARLY);
}
queryComponent.process(checkResponse);
hits = (Integer) checkResponse.rsp.getToLog().get("hits");
} catch (EarlyTerminatingCollectorException etce) {
Although I'm using Solr 6.2.1, the source file is still identical to Solr 6.5.0.
The line causing my exception is when determining the hits. I've noticed the
exception only occurs when no more than 2 alternatives are found, but when 3
alternatives (maxCollations) are found, the NPE isn't occurring.
As a workaround I could live for now with turning collations off.
Please let me know if you need more information. Thanks!
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