Minor performance improvements for 5.1 [SPR-17074]

[spring-projects-issues]

Сергей Цыпанов opened SPR-17074 and commented

This is a ticket for minor performance improvements for 5.1. My intention is to use it in connection with pull-requests created for changes introduced via code static analysis, benchmarking, and profiling.

• SPR-17074 Replace iteration over Map::keySet with Map::entrySet #1891
• SPR-17074 pass argument of addAll/putAll into constructor #1903
• SPR-17074 Use lambda for lazy instantiation #1911

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Referenced from: pull request #1891, and commits 457d586, f834083, 69c6a40, 5051850, b5c691b, 2938a95

[spring-projects-issues]

Juergen Hoeller commented

While the initial pull request has been merged for RC1 already, I'll leave this ticket open for RC2 for further performance fine-tuning.

[spring-projects-issues]

Juergen Hoeller commented

On a related note to the second pull request here, we pre-size LinkedHashSet for conversion from an array in StringUtils now (in removeDuplicateStrings and commaDelimitedListToSet, triggered by the nullability revision in #21660).