CaderHancock opened a new pull request #933: SOLR-13209 NullPointerException from call in org.apache.solr.search.SolrIndexSearcher.getDocSet URL: https://github.com/apache/lucene-solr/pull/933 <!-- Before creating a pull request, please file an issue in the ASF Jira system for Lucene or Solr: * https://issues.apache.org/jira/projects/LUCENE * https://issues.apache.org/jira/projects/SOLR You will need to create an account in Jira in order to create an issue. The title of the PR should reference the Jira issue number in the form: * LUCENE-####: <short description of problem or changes> * SOLR-####: <short description of problem or changes> LUCENE and SOLR must be fully capitalized. A short description helps people scanning pull requests for items they can work on. Properly referencing the issue in the title ensures that Jira is correctly updated with code review comments and commits. --> # Description The root of this issue is the absence of error handling when a null query is passed to SolrIndexSearcher or Grouping$CommandQuery. # Solution In the first case, this is solved by returning DocSet.EMPTY before any calls are made on the null reference (absQ). In the second case, this is solved by a local variable assigned to a ternary statement that returns an empty String literal when the query is null. So that no method calls are made on the null reference. While the second issue is not in the JIRA, it was discovered after applying the fix for the first case. The new behavior is that an empty DocList is returned to the user instead of a 500 error and NPE. # Checklist Please review the following and check all that apply: - [x] I have reviewed the guidelines for [How to Contribute](https://wiki.apache.org/solr/HowToContribute) and my code conforms to the standards described there to the best of my ability. - [x] I have created a Jira issue and added the issue ID to my pull request title. - [x] I am authorized to contribute this code to the ASF and have removed any code I do not have a license to distribute. - [x] I have given Solr maintainers [access](https://help.github.com/en/articles/allowing-changes-to-a-pull-request-branch-created-from-a-fork) to contribute to my PR branch. (optional but recommended) - [x] I have developed this patch against the `master` branch. - [x] I have run `ant precommit` and the appropriate test suite. - [ ] I have added tests for my changes. - [ ] I have added documentation for the [Ref Guide](https://github.com/apache/lucene-solr/tree/master/solr/solr-ref-guide) (for Solr changes only).
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