[
https://issues.apache.org/jira/browse/SOLR-13188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16906000#comment-16906000
]
Chongchen Chen commented on SOLR-13188:
---------------------------------------
I reproduced it.
It seems that the root cause is in QueryComponent.
{code:java}
public void process(ResponseBuilder rb) throws IOException
{
//....
GroupingSpecification groupingSpec = rb.getGroupingSpec();
if (groupingSpec != null) {
// ....
}
// the groupingSpec is null, then query initialization is skipped.
}
{code}
> NullPointerException in
> org.apache.lucene.search.IndexSearcher.rewrite(IndexSearcher.java:667)
> ----------------------------------------------------------------------------------------------
>
> Key: SOLR-13188
> URL: https://issues.apache.org/jira/browse/SOLR-13188
> 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: home.zip
>
>
> Requesting the following URL causes Solr to return an HTTP 500 error response:
> {noformat}
> http://localhost:8983/solr/films/select?q={!parent%20fq={!collapse%20field=id}&rentDocument}
> {noformat}
> The error response seems to be caused by the following uncaught exception:
> {noformat}
> ERROR (qtp689401025-21) [ x:films] o.a.s.s.HttpSolrCall
> null:java.lang.NullPointerException
> at
> org.apache.lucene.search.IndexSearcher.rewrite(IndexSearcher.java:667)
> at
> org.apache.lucene.search.join.QueryBitSetProducer.getBitSet(QueryBitSetProducer.java:73)
> at
> org.apache.solr.search.join.BlockJoinParentQParser$BitDocIdSetFilterWrapper.getDocIdSet(BlockJoinParentQParser.java:135)
> at
> org.apache.solr.search.SolrConstantScoreQuery$ConstantWeight.scorer(SolrConstantScoreQuery.java:99)
> at org.apache.lucene.search.Weight.bulkScorer(Weight.java:177)
> at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:649)
> at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:443)
> at
> org.apache.solr.search.SolrIndexSearcher.buildAndRunCollectorChain(SolrIndexSearcher.java:200)
> at
> org.apache.solr.search.SolrIndexSearcher.getDocListNC(SolrIndexSearcher.java:1604)
> at
> org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1420)
> at
> org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:567)
> at
> org.apache.solr.handler.component.QueryComponent.doProcessUngroupedSearch(QueryComponent.java:1434)
> at
> org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:373)
> 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}
> In org/apache/lucene/search/join/QueryBitSetProducer.java[73] there is called
> method 'org.apache.lucene.search.IndexSearcher.rewrite' with null value
> stored
> in the member 'query'. Inside the called method there is method 'rewrite' on
> the
> accepted argument.
> The member 'query' of QueryBitSetProducer is initialised only once (i.e. only
> for
> the first query issued; for subsequent queries it is not created again) from
> 'org.apache.solr.search.join.BlockJoinParentQParser.getCachedFilter'
> (org/apache/solr/search/join/BlockJoinParentQParser.java[98]), where is
> called 'createParentFilter' with null.
> ---------------------------
> 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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