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https://issues.apache.org/jira/browse/SOLR-13178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kevin Risden updated SOLR-13178:
--------------------------------
Fix Version/s: (was: 8.x)
(was: master (9.0))
> ClassCastExceptions in o.a.s.request.json.ObjectUtil for valid JSON inputs
> that are not objects
> -----------------------------------------------------------------------------------------------
>
> Key: SOLR-13178
> URL: https://issues.apache.org/jira/browse/SOLR-13178
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Server
> Affects Versions: 7.5, master (9.0)
> Environment: Running on Unix, using a git checkout close to master.
> h2. Steps to reproduce
> * 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 above.
> h2. 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}
> h2. Building the collection
> We followed Exercise 2 from the quick start tutorial
> ([http://lucene.apache.org/solr/guide/7_5/solr-tutorial.html#exercise-2]) -
> for reference, I have attached a copy of the database.
> {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:
> {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: Johannes Kloos
> Priority: Minor
> Labels: diffblue, newdev
> Attachments: home.zip
>
>
> Requesting any of the following URLs gives a 500 error due to a
> ClassCastException in o.a.s.r.j.ObjectUtil.mergeObjects:
> * [http://localhost:8983/solr/films/select?json=0]
> * [http://localhost:8983/solr/films/select?json.facet=1&json.facet.field=x]
> The error response is caused by uncaught ClassCastExceptions, such as (for
> the first URL):
> {\{ java.lang.ClassCastException: java.lang.Long cannot be cast to
> java.util.Map}}
> {{at
> org.apache.solr.request.json.ObjectUtil.mergeObjects(ObjectUtil.java:108)}}
> {{at
> org.apache.solr.request.json.RequestUtil.mergeJSON(RequestUtil.java:269)}}
> {{at
> org.apache.solr.request.json.RequestUtil.processParams(RequestUtil.java:180)}}
> {{at
> org.apache.solr.util.SolrPluginUtils.setDefaults(SolrPluginUtils.java:167)}}
> {{at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:196)}}
> {{[...]}}
> {{The culprit seems to be the o.a.s.r.j.RequestUtil.mergeJSON method, in
> particular the following fragment:}}
> {{ Object o = ObjectBuilder.fromJSON(jsonStr);}}
> {{ // zero-length strings or comments can cause this to be null (and
> a zero-length string can result from a json content-type w/o a body)}}
> {{ if (o != null) {}}
> {{ ObjectUtil.mergeObjects(json, path, o, handler);}}
> }
> Note that o is an Object representing a JSON _value_, while SOLR seems to
> expect that o holds a JSON _object_. But in the examples above, the JSON
> value is a number (represented by a Long object) instead - this is, in fact,
> valid JSON.
> A possible fix could be to use the getObject method of ObjectUtil instead of
> blindly calling fromJSON.
> This bug was found using [Diffblue Microservices
> Testing|http://www.diffblue.com/labs]. Find more information on this [test
> 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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