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https://issues.apache.org/jira/browse/SOLR-14579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17141832#comment-17141832
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Noble Paul commented on SOLR-14579:
-----------------------------------
the NEW_HASHMAP_FUN was added for a purpose (efficiency)
java's lambdas are pretty inefficient. You create a new class and a new
instance of that class every time that code is executed. It's inefficient .
> Remove SolrJ 'Utils' generic map functions
> ------------------------------------------
>
> Key: SOLR-14579
> URL: https://issues.apache.org/jira/browse/SOLR-14579
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: master (9.0)
> Reporter: Megan Carey
> Priority: Minor
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Remove the map functions like `NEW_HASHMAP_FUN` from the Utils class in solrj
> module to reduce warnings and improve code quality.
> [https://github.com/apache/lucene-solr/blob/master/solr/solrj/src/java/org/apache/solr/common/util/Utils.java#L92]
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