This repo demonstrates an issue with the spring-cloud-openfeign vanilla configuration for clients using the spring data Page.
Clone the repo and run ./mvnw test
And you should see an error like this:
feign.codec.DecodeException:
Type definition error: [simple type, class org.springframework.data.domain.Page]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `org.springframework.data.domain.Page` (no Creators, like default construct, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information
at [Source: (PushbackInputStream); line: 1, column: 1]
at com.example.demo.DemoControllerTest.testClient(DemoControllerTest.java:22)
Caused by: org.springframework.http.converter.HttpMessageConversionException:
Type definition error: [simple type, class org.springframework.data.domain.Page]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `org.springframework.data.domain.Page` (no Creators, like default construct, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information
at [Source: (PushbackInputStream); line: 1, column: 1]
at com.example.demo.DemoControllerTest.testClient(DemoControllerTest.java:22)
Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException:
Cannot construct instance of `org.springframework.data.domain.Page` (no Creators, like default construct, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information
at [Source: (PushbackInputStream); line: 1, column: 1]
at com.example.demo.DemoControllerTest.testClient(DemoControllerTest.java:22)