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https://issues.apache.org/jira/browse/SOLR-9093?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Rowe reopened SOLR-9093:
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Reopening to backport to 6.0.1.
> fix TopGroupsShardResponseProcessor.java:105 NullPointerException
> -----------------------------------------------------------------
>
> Key: SOLR-9093
> URL: https://issues.apache.org/jira/browse/SOLR-9093
> Project: Solr
> Issue Type: Bug
> Reporter: Christine Poerschke
> Assignee: Christine Poerschke
> Priority: Minor
> Fix For: 5.6, 6.1, master (7.0)
>
>
> e.g.
> http://jenkins.thetaphi.de/job/Lucene-Solr-master-Linux/16693/testReport/junit/org.apache.solr/TestDistributedSearch/test/
> {code}
> org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException: Error
> from server at http://127.0.0.1:44706//collection1:
> java.lang.NullPointerException
> at
> org.apache.solr.search.grouping.distributed.responseprocessor.TopGroupsShardResponseProcessor.process(TopGroupsShardResponseProcessor.java:105)
> at
> org.apache.solr.handler.component.QueryComponent.handleGroupedResponses(QueryComponent.java:753)
> at
> org.apache.solr.handler.component.QueryComponent.handleResponses(QueryComponent.java:736)
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:420)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:155)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:2016)
> ...
> {code}
> A minimalistic fix would be
> {code}
> - if (t instanceof SolrServerException) {
> + if (t instanceof SolrServerException && t.getCause() != null) {
> {code}
> but perhaps equally valid would be to tweak the logic, similar to the
> [SearchHandler.java#L440|https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/handler/component/SearchHandler.java#L440]
> logic, the difference being cause vs. root-cause for SolrServerException
> exceptions and throwable vs. throwable.cause for other exceptions.
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