[jira] [Resolved] (SOLR-13194) NullPointerException in org/apache/solr/handler/component/ExpandComponent.java[240]

["Munendra S N (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-13194?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Munendra S N resolved SOLR-13194.
---------------------------------
      Assignee:     (was: Mikhail Khludnev)
    Resolution: Won't Fix

As expand is not allowed with grouping SOLR-13970, closing this won't fix

> NullPointerException in org/apache/solr/handler/component/ExpandComponent.java[240]
> -----------------------------------------------------------------------------------
>
>                 Key: SOLR-13194
>                 URL: https://issues.apache.org/jira/browse/SOLR-13194
>             Project: Solr
>          Issue Type: Bug
>    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
> 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]. The attached file ({{home.zip}}) gives the contents of folder {{/tmp/home}} that you will obtain by following the steps below:
> {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
> {noformat}
>            Reporter: Marek
>            Priority: Minor
>              Labels: diffblue, newdev
>         Attachments: SOLR-13194.patch, home.zip
>
>
> Requesting the following URL causes Solr to return an HTTP 500 error response:
> {noformat}
> http://localhost:8983/solr/films/select?expand=true&fq={!collapse%20field=id}&group=true&group.func=genre
> {noformat}
> The error response seems to be caused by the following uncaught exception:
> {noformat}
> ERROR (qtp689401025-38) [   x:films] o.a.s.s.HttpSolrCall null:java.lang.NullPointerException
> 	at org.apache.solr.handler.component.ExpandComponent.process(ExpandComponent.java:240)
> 	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)
> 	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 called method 'size' on the variable 'docList', which is null. The null value comes from parameter 'rb' (an instance of class 'org.apache.solr.handler.component.ResponseBuilder'), where 'rb.results.docList' is assigned to the mentioned local variable 'docList'.
> We found this bug 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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