Compatibility with JOpt 4.6 [SPR-11359]

[spring-projects-issues]

Juergen Hoeller opened SPR-11359 and commented

JOpt 4.6 redeclared its nonOptionArguments() method from List<String> to List<?>, requiring us to select String arguments only as we do for regular option values already.

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Affects: 3.2.6, 4.0 GA

Referenced from: commits 67e76e9, 1a2033e

Backported to: 3.2.7