fix(java): remove Jackson confusion with certain patterns #1070
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(Reintroduce #987). Upon deserializing (`ObjectMapper#treeToValue`), Jackson will first validate the `valueType` for whether ti can be deserialized with the "standard" bean deserializer. This will bail out if there are multiple ambiguous setters for a given property (they are ambiguous if they have parameters of non-trivial types, such as `List`, some class, ...). In order to remove the problem, this changes the deserialization path so that instead of asking for deserialization into the needed instance type directly, `JsiiObject` will be requested instead when the declared type is a sub-class of that. Since such types are passed by-reference, the custom de-serializer modifier will correctly determine the "right" class to use (the declared type, or a subtype of it), and return this... But Jackson will not get the chance to be confused or unhappy about that type's structure. This was the root cause of aws/aws-cdk#4080
RomainMuller
approved these changes
Nov 26, 2019
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Thank you for contributing! ❤️ I will now look into making sure the PR is up-to-date, then proceed to try and merge it! |
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(Reintroduce #987).
Upon deserializing (
ObjectMapper#treeToValue), Jackson will firstvalidate the
valueTypefor whether ti can be deserialized with the"standard" bean deserializer. This will bail out if there are multiple
ambiguous setters for a given property (they are ambiguous if they have
parameters of non-trivial types, such as
List, some class, ...).In order to remove the problem, this changes the deserialization path so
that instead of asking for deserialization into the needed instance type
directly,
JsiiObjectwill be requested instead when the declared typeis a sub-class of that. Since such types are passed by-reference, the
custom de-serializer modifier will correctly determine the "right" class
to use (the declared type, or a subtype of it), and return this... But
Jackson will not get the chance to be confused or unhappy about that
type's structure.
This was the root cause of aws/aws-cdk#4080
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.