Jack Krupansky created SOLR-4366:
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Summary: NPE sometimes in SpellCheckComponent when dictionary name
not defined
Key: SOLR-4366
URL: https://issues.apache.org/jira/browse/SOLR-4366
Project: Solr
Issue Type: Bug
Components: spellchecker
Affects Versions: 4.0
Reporter: Jack Krupansky
SpellCheckComponent sometimes detects and reports dictionary names that are not
defined, but not always. I stumbled on two cases where an NPE occurs rather
than a 404 status code return.
Repro:
Add this snippet to the Solr 4.0 example solrconfig.xml:
{code}
<requestHandler name="/spellBug" class="solr.SearchHandler" startup="lazy">
<lst name="defaults">
<str name="df">name</str>
<str name="spellcheck">on</str>
<str name="spellcheck.dictionary">other-name</str>
</lst>
<arr name="last-components">
<str>spellcheckBug</str>
</arr>
</requestHandler>
<searchComponent name="spellcheckBug" class="solr.SpellCheckComponent">
<lst name="spellchecker">
<str name="name">some-name</str>
<str name="classname">solr.FileBasedSpellChecker</str>
<str name="sourceLocation">SpellDict.txt</str>
<str name="buildOnCommit">true</str>
</lst>
</searchComponent>
{code}
Case 1: spellcheck.build=true parameter specified
Execute this request:
{code}
curl "http://localhost:8983/solr/spellBug/?q=test&spellcheck.build=true";
{code}
Produces this NPE:
{code}
SEVERE: null:java.lang.NullPointerException
at
org.apache.solr.handler.component.SpellCheckComponent.prepare(SpellCheckComponent.java:108)
at
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:185)
{code}
Case 1a: Ditto for spellcheck.reload parameter specified
{code}
curl "http://localhost:8983/solr/spellBug/?q=test&spellcheck.reload=true";
{code}
Case 2: spellcheck.q parameter specified
Execute this request:
{code}
curl "http://localhost:8983/solr/spellBug/?spellcheck.q=test";
{code}
Produces this NPE:
{code}
SEVERE: null:java.lang.NullPointerException
at
org.apache.solr.handler.component.SpellCheckComponent.process(SpellCheckComponent.java:130)
at
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:206)
{code}
The first case fails in the "prepare" method of SpellCheckComponent, while the
second case fails in the "process" method. Both methods call getSpellChecker,
but then proceed to reference the return value without checking if it is null.
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