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https://issues.apache.org/jira/browse/SOLR-12852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16646874#comment-16646874
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Dawid Weiss commented on SOLR-12852:
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Hmm... What's your setup that uses "distrib=true", Markus? I really don't know
much about distributed mode, but grepping for "distrib" yields all kinds of
interesting stuff that's unrelated to the clustering plugin...:
{code}
BaseDistributedSearchTestCase:
// TODO: look into why passing true causes fails
params.set("distrib", "false");
{code}
I'm not sure where to start, to be honest. There is a
"DistributedClusteringComponentTest.java" and it seems to be passing. The
offending line (NPE) happens in
{code}
DocListAndSet results = rb.getResults();
Map<SolrDocument,Integer> docIds = new HashMap<>(results.docList.size());
{code}
so I'm guessing docList is empty (or results). Don't want to dodge the problem
(if ... != null) without understanding the cause.
> NPE in ClusteringComponent
> --------------------------
>
> Key: SOLR-12852
> URL: https://issues.apache.org/jira/browse/SOLR-12852
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: contrib - Clustering
> Affects Versions: 7.5
> Reporter: Markus Jelsma
> Assignee: Dawid Weiss
> Priority: Major
> Fix For: master (8.0)
>
>
> Got this exception:
> {code}
> o.a.s.s.HttpSolrCall null:java.lang.NullPointerException
> at
> org.apache.solr.handler.clustering.ClusteringComponent.process(ClusteringComponent.java:234)
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:298)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:2541)
> at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:709)
> at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:515)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:377)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:323)
> {code}
> with this config (copied from reference guide, changed title and snippet
> parameters)
> {code}
> <searchComponent name="clustering"
> class="solr.clustering.ClusteringComponent">
> <!-- Lingo clustering algorithm -->
> <lst name="engine">
> <str name="name">lingo</str>
> <str
> name="carrot.algorithm">org.carrot2.clustering.lingo.LingoClusteringAlgorithm</str>
> </lst>
> <!-- An example definition for the STC clustering algorithm. -->
> <lst name="engine">
> <str name="name">stc</str>
> <str
> name="carrot.algorithm">org.carrot2.clustering.stc.STCClusteringAlgorithm</str>
> </lst>
> </searchComponent>
>
> <requestHandler name="/clustering"
> class="solr.SearchHandler">
> <lst name="defaults">
> <bool name="clustering">true</bool>
> <bool name="clustering.results">true</bool>
> <!-- Logical field to physical field mapping. -->
> <str name="carrot.url">id</str>
> <str name="carrot.title">title_nl</str>
> <str name="carrot.snippet">content_nl</str>
> <!-- Configure any other request handler parameters. We will cluster the
> top 100 search results so bump up the 'rows' parameter. -->
> <str name="rows">100</str>
> <str name="fl">*,score</str>
> </lst>
> <!-- Append clustering at the end of the list of search components. -->
> <arr name="last-components">
> <str>clustering</str>
> </arr>
> </requestHandler>
> {code}
> using this query:
> http://localhost:8983/solr/collection/clustering?q=*:*
> All libraries are present, Solr no longer complains about missing classes,
> instead i got this.
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