Fix inconsistent query parameter conversion for String param #34711
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Signed-off-by: kssumin <201566@jnu.ac.kr>
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Issue
When converting multiple query parameters with the same name to a single value, Spring behaves inconsistently depending on the target type:
/endpoint?param=1¶m=2→ first value is used (1)/endpoint?param=1¶m=2→ comma-separated string is created (1,2)This inconsistency makes behavior unpredictable and forces developers to implement workarounds.
Changes
This PR modifies
WebRequestDataBinderto handleString[]toStringconversion consistently with other types by only using the first value when binding web request parameters.Tests
Added unit tests to verify consistent behavior across different parameter types.
Fixes #34613