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ObjectMapperCustomizer not working with JAX-RS client

See original GitHub issue

Describe the bug When using the JAX-RS client obtained through JAX-RS’ ClientBuilder (e.g. ClientBuilder.newClient()) any custom ObjectMapperCustomizers are not respected as they are with the MicroProfile REST client.

Expected behavior The ObjectMapper used by a JAX-RS client constructed using ClientBuilder.newClient() should also have been customized by any registered ObjectMapperCustomizers.

Actual behavior For a reproducible example see https://github.com/knutwannheden/quarkus-bug-jaxrs-object-mapper, where the ObjectMapper is customized by calling objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES). The repo contains a test case demonstrating that this works as expected for MicroProfile REST client but fails with the JAX-RS client.

To Reproduce Steps to reproduce the behavior:

git clone https://github.com/knutwannheden/quarkus-bug-jaxrs-object-mapper
cd quarkus-bug-jaxrs-object-mapper/
mvn clean verify

Environment (please complete the following information):

Output of uname -a or ver: MSYS_NT-10.0-19042 DESKTOP-HR8N4ES 3.1.4-340.x86_64 2020-05-19 12:55 UTC x86_64 Msys
Output of java -version: openjdk version “11.0.7” 2020-04-14 LTS
GraalVM version (if different from Java):
Quarkus version or git rev: 1.8.0.CR1
Build tool (ie. output of mvnw --version or gradlew --version): Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)