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From "Cesar Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-13209) NullPointerException from call in org.apache.solr.search.SolrIndexSearcher.getDocSet
Date Thu, 31 Jan 2019 18:31:00 GMT
Cesar Rodriguez created SOLR-13209:
--------------------------------------

             Summary: NullPointerException from call in org.apache.solr.search.SolrIndexSearcher.getDocSet
                 Key: SOLR-13209
                 URL: https://issues.apache.org/jira/browse/SOLR-13209
             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: Cesar Rodriguez


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

{noformat}
http://localhost:8983/solr/films/select?group=true&group.query
{noformat}

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

{noformat}
 java.lang.NullPointerException
	at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)
	at org.apache.solr.util.ConcurrentLRUCache.get(ConcurrentLRUCache.java:124)
	at org.apache.solr.search.FastLRUCache.get(FastLRUCache.java:163)
	at org.apache.solr.search.SolrIndexSearcher.getDocSet(SolrIndexSearcher.java:792)
	at org.apache.solr.search.Grouping$CommandQuery.createFirstPassCollector(Grouping.java:860)
	at org.apache.solr.search.Grouping.execute(Grouping.java:327)
	at org.apache.solr.handler.component.QueryComponent.doProcessGroupedSearch(QueryComponent.java:1408)
	at org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:365)
	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:2559)
[...]
{noformat}

Method {{org.apache.solr.search.SolrIndexSearcher.getDocSet()}}, at line 792 calls {{filterCache.get(absQ)}}
where {{absQ}} is a null pointer. I think this null pointer comes in fact from the caller,
but I don't fully follow the logic of the code.

To set up an environment to reproduce this bug, follow the description in the ‘Environment’
field.

We automatically 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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