Register Jackson @JsonNaming strategies for reflection

Fix quarkusio#11397

extensions/jackson/deployment/src/main/java/io/quarkus/jackson/deployment/JacksonProcessor.java

@@ -53,6 +53,7 @@ public class JacksonProcessor {
     private static final DotName JSON_DESERIALIZE = DotName.createSimple(JsonDeserialize.class.getName());
     private static final DotName JSON_SERIALIZE = DotName.createSimple(JsonSerialize.class.getName());
     private static final DotName JSON_CREATOR = DotName.createSimple("com.fasterxml.jackson.annotation.JsonCreator");
+    private static final DotName JSON_NAMING = DotName.createSimple("com.fasterxml.jackson.databind.annotation.JsonNaming");
     private static final DotName BUILDER_VOID = DotName.createSimple(Void.class.getName());
 
     private static final String TIME_MODULE = "com.fasterxml.jackson.datatype.jsr310.JavaTimeModule";
@@ -140,6 +141,14 @@ CapabilityBuildItem register() {
             }
         }
 
+        // register @JsonNaming strategy implementations for reflection
+        for (AnnotationInstance jsonNamingInstance : index.getAnnotations(JSON_NAMING)) {
+            AnnotationValue strategyValue = jsonNamingInstance.value("value");
+            if (strategyValue != null) {
+                reflectiveClass.produce(new ReflectiveClassBuildItem(true, true, strategyValue.asClass().name().toString()));
+            }
+        }
+
         // this needs to be registered manually since the runtime module is not indexed by Jandex
         additionalBeans.produce(new AdditionalBeanBuildItem(ObjectMapperProducer.class));
 

integration-tests/jackson/src/main/java/io/quarkus/it/jackson/ModelWithJsonNamingStrategyResource.java

@@ -0,0 +1,28 @@
+package io.quarkus.it.jackson;
+
+import java.io.IOException;
+
+import javax.ws.rs.GET;
+import javax.ws.rs.Path;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import io.quarkus.it.jackson.model.SampleResponse;
+
+@Path("/json-naming/")
+public class ModelWithJsonNamingStrategyResource {
+
+    private final ObjectMapper objectMapper;
+
+    public ModelWithJsonNamingStrategyResource(ObjectMapper objectMapper) {
+        this.objectMapper = objectMapper;
+    }
+
+    @GET
+    @Produces(MediaType.APPLICATION_JSON)
+    public String get() throws IOException {
+        return objectMapper.writeValueAsString(new SampleResponse("My blog post"));
+    }
+}

integration-tests/jackson/src/main/java/io/quarkus/it/jackson/model/SampleResponse.java

@@ -0,0 +1,35 @@
+package io.quarkus.it.jackson.model;
+
+import com.fasterxml.jackson.databind.PropertyNamingStrategy;
+import com.fasterxml.jackson.databind.annotation.JsonNaming;
+
+import io.quarkus.runtime.annotations.RegisterForReflection;
+
+@JsonNaming(PropertyNamingStrategy.SnakeCaseStrategy.class)
+@RegisterForReflection
+public class SampleResponse {
+
+    private String blogTitle;
+
+    public SampleResponse() {
+    }
+
+    public SampleResponse(String blogTitle) {
+        this.blogTitle = blogTitle;
+    }
+
+    public String getBlogTitle() {
+        return blogTitle;
+    }
+
+    public void setBlogTitle(String blogTitle) {
+        this.blogTitle = blogTitle;
+    }
+
+    @Override
+    public String toString() {
+        return "SampleResponse{" +
+                "blogTitle='" + blogTitle + '\'' +
+                '}';
+    }
+}

integration-tests/jackson/src/test/java/io/quarkus/it/jackson/ModelWithJsonNamingStrategyResourceIT.java

@@ -0,0 +1,9 @@
+package io.quarkus.it.jackson;
+
+import io.quarkus.test.junit.NativeImageTest;
+
+@NativeImageTest
+public class ModelWithJsonNamingStrategyResourceIT extends ModelWithJsonNamingStrategyResourceTest {
+
+    // Execute the same tests but in native mode.
+}

integration-tests/jackson/src/test/java/io/quarkus/it/jackson/ModelWithJsonNamingStrategyResourceTest.java

@@ -0,0 +1,24 @@
+package io.quarkus.it.jackson;
+
+import static io.restassured.RestAssured.given;
+import static org.hamcrest.CoreMatchers.containsString;
+
+import java.io.IOException;
+
+import org.junit.jupiter.api.Test;
+
+import io.quarkus.test.junit.QuarkusTest;
+
+@QuarkusTest
+public class ModelWithJsonNamingStrategyResourceTest {
+
+    @Test
+    public void testStrategy() throws IOException {
+        given()
+                .when().get("/json-naming/")
+                .then()
+                .statusCode(200)
+                .body(containsString("blog_title"));
+    }
+
+}