[ 
https://issues.apache.org/jira/browse/SOLR-13197?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Marek updated SOLR-13197:
-------------------------
    Labels: diffblue newdev  (was: )

> NullPointerException in org/apache/solr/handler/component/StatsField.java[251]
> ------------------------------------------------------------------------------
>
>                 Key: SOLR-13197
>                 URL: https://issues.apache.org/jira/browse/SOLR-13197
>             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
> 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: home.zip
>
>
> Requesting the following URL causes Solr to return an HTTP 500 error response:
> {noformat}
> http://localhost:8983/solr/films/select?stats=true&stats.field={!cardinalit}
> {noformat}
> The error response seems to be caused by the following uncaught exception:
> {noformat}
> ERROR (qtp689401025-17) [   x:films] o.a.s.s.HttpSolrCall 
> null:java.lang.NullPointerException
>       at 
> org.apache.solr.handler.component.StatsField.<init>(StatsField.java:251)
>       at 
> org.apache.solr.handler.component.StatsInfo.<init>(StatsComponent.java:194)
>       at 
> org.apache.solr.handler.component.StatsComponent.prepare(StatsComponent.java:47)
>       at 
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:272)
>       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 'createParser' on local variable 'qplug' which is set 
> to null on the previous line (i.e. 250). The value null is set to the local 
> variable 'qplug', because of failure in finding the sting "cardinalit" in the 
> field 'registry' of the class org.apache.solr.core.PluginBag (at line 
> org/apache/solr/core/PluginBag.java[167]).
> 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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