[SOLR-13204] ArrayIndexOutOfBoundsException in org/apache/solr/search/grouping/endresulttransformer/MainEndResultTransformer.java[36]

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 9.0
• Fix Version/s: 8.2
• Labels: diffblue newdev

Environment

Steps to reproduce

• Use a Linux machine.
• Build commit ea2c8ba of Solr as described in the section below.
• Build the films collection as described below.
• Start the server using the command ./bin/solr start -f -p 8983 -s /tmp/home
• Request the URL given in the bug description.

Compiling the server

git clone https://github.com/apache/lucene-solr
cd lucene-solr
git checkout ea2c8ba
ant compile
cd solr
ant server

Building the collection and reproducing the bug

We followed Exercise 2 from the Solr Tutorial.

mkdir -p /tmp/home
echo '<?xml version="1.0" encoding="UTF-8" ?><solr></solr>' > /tmp/home/solr.xml

In one terminal start a Solr instance in foreground:

./bin/solr start -f -p 8983 -s /tmp/home

In another terminal, create a collection of movies, with no shards and no replication, and initialize it:

bin/solr create -c films
curl -X POST -H 'Content-type:application/json' --data-binary '{"add-field": {"name":"name", "type":"text_general", "multiValued":false, "stored":true}}' http://localhost:8983/solr/films/schema
curl -X POST -H 'Content-type:application/json' --data-binary '{"add-copy-field" : {"source":"*","dest":"_text_"}}' http://localhost:8983/solr/films/schema
./bin/post -c films example/films/films.json
curl -v "URL_BUG"

Please check the issue description below to find the "URL_BUG" that will allow you to reproduce the issue reported.

• Assignee: Munendra S N
• Reporter: Marek
• Created: 31/Jan/19 13:34
• Updated: 26/Jul/19 08:56
• Resolved: 02/Jul/19 04:05

Description

Requesting the following URL causes Solr to return an HTTP 500 error response:

solr/films/select?group=true&distrib=true&group.main=true

The error response seems to be caused by the following uncaught exception:

ERROR (qtp689401025-18) [   x:films] o.a.s.s.HttpSolrCall null:java.lang.ArrayIndexOutOfBoundsException: 0
	at org.apache.solr.search.grouping.endresulttransformer.MainEndResultTransformer.transform(MainEndResultTransformer.java:36)
	at org.apache.solr.handler.component.QueryComponent.groupedFinishStage(QueryComponent.java:638)
	at org.apache.solr.handler.component.QueryComponent.finishStage(QueryComponent.java:601)
	at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:432)
	at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199)
	at org.apache.solr.core.SolrCore.execute(SolrCore.java:2559)
	at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:711)
	at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:516)
	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:394)
	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:340)
	[...]

There is accessed the first element of an empty array of strings, stored in the member 'org.apache.solr.search.grouping.GroupingSpecification.fields'. There is an attept to put some strings to the array at org/apache/solr/handler/component/QueryComponent.java[283]; however, the string "group.field" is not present in params of the processed org.apache.solr.request.SolrQueryRequest instance.

Look into section 'Environment' above to see installation step of Solr and films collection.

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Issue Links

• Is contained by: SOLR-13404 group.query doesn't work in distrib mode when group.format=simple