[
https://issues.apache.org/jira/browse/SOLR-13181?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
David Smiley reassigned SOLR-13181:
-----------------------------------
Assignee: David Smiley
> NullPointerException in org.apache.solr.request.macro.MacroExpander
> -------------------------------------------------------------------
>
> Key: SOLR-13181
> URL: https://issues.apache.org/jira/browse/SOLR-13181
> 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: Cesar Rodriguez
> Assignee: David Smiley
> Priority: Minor
> Labels: diffblue, newdev
> Attachments: SOLR-13181.patch, home.zip
>
>
> Requesting the following URL causes Solr to return an HTTP 500 error response:
> {noformat}
> http://localhost:8983/solr/films/select?a=${${b}}
> {noformat}
> The error response seems to be caused by the following uncaught exception:
> {noformat}
> java.lang.StringIndexOutOfBoundsException: String index out of range: -4
> at java.lang.String.substring(String.java:1967)
> at
> org.apache.solr.request.macro.MacroExpander._expand(MacroExpander.java:150)
> at
> org.apache.solr.request.macro.MacroExpander.expand(MacroExpander.java:101)
> at
> org.apache.solr.request.macro.MacroExpander.expand(MacroExpander.java:65)
> at
> org.apache.solr.request.macro.MacroExpander.expand(MacroExpander.java:51)
> at
> org.apache.solr.request.json.RequestUtil.processParams(RequestUtil.java:159)
> at
> org.apache.solr.util.SolrPluginUtils.setDefaults(SolrPluginUtils.java:167)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:196)
> [...]
> {noformat}
> Parameter [macro
> expansion|http://yonik.com/solr-query-parameter-substitution/] seems to take
> place in {{org.apache.solr.request.macro.MacroExpander._expand(String val)}}.
> From reading the code of the function it seems that macros are not expanded
> inside curly brackets {{${...}}}, and so the {{${b}}} inside
> {noformat}
> ${${b}}
> {noformat}
> should not be expanded. But the function seems to fail to detect this
> specific case and graciously refuse to expand it.
> A possible fix could be updating the {{idx}} variable when the {{StrParser}}
> detects that no valid identifier can be found inside the brackets. See
> attached file
> {{0001-Macro-expander-fail-gracefully-on-unsupported-syntax.patch}}.
> 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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