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https://issues.apache.org/jira/browse/SOLR-13187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16837352#comment-16837352
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Charles Sanders commented on SOLR-13187:
----------------------------------------
Created a patch to catch the NPE and return as a 400 in response.
> NullPointerException at o.a.solr.search.QParser.getParser
> ---------------------------------------------------------
>
> Key: SOLR-13187
> URL: https://issues.apache.org/jira/browse/SOLR-13187
> 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: Cesar Rodriguez
> Priority: Minor
> Labels: diffblue, newdev
> Attachments: SOLR-13187.patch, home.zip
>
>
> Requesting the following URL causes Solr to return an HTTP 500 error response:
> {noformat}
> http://localhost:8983/solr/films/select?fq={!a}
> {noformat}
> The error response seems to be caused by the following uncaught exception:
> {noformat}
> java.lang.NullPointerException
> at org.apache.solr.search.QParser.getParser(QParser.java:367)
> at org.apache.solr.search.QParser.getParser(QParser.java:319)
> at org.apache.solr.search.QParser.getParser(QParser.java:309)
> at
> org.apache.solr.handler.component.QueryComponent.prepare(QueryComponent.java:203)
> 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)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1602)
> [...]
> {noformat}
> The call to {{getQueryPlugin}} from
> {{org.apache.solr.search.QParser.getParser()}}, at line 366, can return a
> null pointer, as witnessed by the URL above. Method {{getParser}} should
> probably check for this.
> We found this bug using [Diffblue Microservices
> Testing|https://www.diffblue.com/labs/]. 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].
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