Fix BeanOutputConverter List type format mismatch#5795
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ehdgusdl wants to merge 2 commits intospring-projects:mainfrom
Open
Fix BeanOutputConverter List type format mismatch#5795ehdgusdl wants to merge 2 commits intospring-projects:mainfrom
ehdgusdl wants to merge 2 commits intospring-projects:mainfrom
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April 13, 2026 03:16
When the target type is a List, some LLMs mirror the JSON schema structure
and return {"type":"array","items":[...]} instead of a plain array [...].
This causes a MismatchedInputException during deserialization.
Extract the array from the "items" key when the response matches the
schema-shaped pattern with "type":"array" and "items" as an array.
Closes spring-projects#5707
Signed-off-by: DHKim7762 <kim138762@gmail.com>
…ndling
- convertListTypeFromSchemaShapedResponse: verify correct extraction
from {"type":"array","items":[...]} responses
- convertListTypeFromSchemaShapedResponseWithEmptyArray: verify empty
array edge case
- convertListTypeIgnoresObjectWithItemsField: verify the fix does not
trigger when "type" is not "array"
Signed-off-by: DHKim7762 <kim138762@gmail.com>
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Summary
BeanOutputConverter.convert()to handle schema-shaped LLM responses for List typesList, some LLMs mirror the JSON schema structure and return{"type":"array","items":[...]}instead of a plain array[...], causing aMismatchedInputException"items"key when the response matches the schema-shaped patternCloses #5707
Changes
BeanOutputConverter.javaconvert(): when the target type isListand the response is an object with"type":"array"and"items"as an array, extract the array for deserializationisListType()helper to check whether the target type is aListor subtypeBeanOutputConverterTest.javaconvertListTypeFromSchemaShapedResponse: verifies correct extraction from{"type":"array","items":[...]}convertListTypeFromSchemaShapedResponseWithEmptyArray: verifies empty array edge caseconvertListTypeIgnoresObjectWithItemsField: verifies the fix does not trigger when"type"is not"array"Test plan
convertTypeReferenceArraytest still passes (no regression for normal array responses)BeanOutputConverterTestsuite passes