[REQ][Java] fix MergedSpecBuilder load servers urls from input specs

[rodrigoma3]

implementation for issue #21965

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@wing328

[wing328]

Thanks for the fix

Did you test this fix locally to confirm it works for your use cases?

[rodrigoma3]

Thanks for the fix

Did you test this fix locally to confirm it works for your use cases?

Hi, yes, I tested it and the behavior was the same as using inputSpec.