Marek created SOLR-13204:
----------------------------
Summary: ArrayIndexOutOfBoundsException in
org/apache/solr/search/grouping/endresulttransformer/MainEndResultTransformer.java[36]
Key: SOLR-13204
URL: https://issues.apache.org/jira/browse/SOLR-13204
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: master (9.0)
Environment: h1. 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.
h1. Compiling the server
{noformat}
git clone https://github.com/apache/lucene-solr
cd lucene-solr
git checkout ea2c8ba
ant compile
cd solr
ant server
{noformat}
h1. Building the collection and reproducing the bug
We followed [Exercise
2|http://lucene.apache.org/solr/guide/7_5/solr-tutorial.html#exercise-2] from
the [Solr Tutorial|http://lucene.apache.org/solr/guide/7_5/solr-tutorial.html].
{noformat}
mkdir -p /tmp/home
echo '<?xml version="1.0" encoding="UTF-8" ?><solr></solr>' > /tmp/home/solr.xml
{noformat}
In one terminal start a Solr instance in foreground:
{noformat}
./bin/solr start -f -p 8983 -s /tmp/home
{noformat}
In another terminal, create a collection of movies, with no shards and no
replication, and initialize it:
{noformat}
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"
{noformat}
Please check the issue description below to find the "URL_BUG" that will allow
you to reproduce the issue reported.
Reporter: Marek
Requesting the following URL causes Solr to return an HTTP 500 error response:
{noformat}
solr/films/select?group=true&distrib=true&group.main=true
{noformat}
The error response seems to be caused by the following uncaught exception:
{noformat}
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)
[...]
{noformat}
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.
We found this issue and ~70 more like this using [Diffblue Microservices
Testing|https://www.diffblue.com/labs/?utm_source=solr-br]. Find more
information on this [fuzz testing
campaign|https://www.diffblue.com/blog/2018/12/19/diffblue-microservice-testing-a-sneak-peek-at-our-early-product-and-results?utm_source=solr-br].
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