Custom ContextResolver can not be used anymore for rest client since 3.13

[Postremus]

Describe the bug

Between 3.12.3 and 3.13.0, an regression was introduced.

During my transition period from resteasy to resteasy-reactive, I needed to reliably set the used ObjectMapper for a rest client. No matter if the app run with classic or reactive. I came up with following:

{
...
WebTarget target = client.target("http://localhost:8080/hello");
target.register(new JacksonObjectMapperContextResolver());
...
}

class JacksonObjectMapperContextResolver implements ContextResolver<ObjectMapper> {

        @Override
        public ObjectMapper getContext(Class<?> type) {
            return CDI.current().select(ObjectMapper.class).get();
        }
    }

The code is obviously a few years old at this point, and I believe quarkus now automatically registers the pre configured object mapper, for classic and reactive.

When I try to use the client from above, I get the exception below in 3.13.0. With 3.12.3, worked fine.

For me, the workaround was to remove my custom context resolver.
Might still be interesting to investigate this, since this pattern is allowed according to spec afaik.

Expected behavior

Rest client should work

Actual behavior

java.lang.NullPointerException: Cannot invoke "java.lang.reflect.Method.getDeclaringClass()" because the return value of "org.jboss.resteasy.reactive.client.impl.RestClientRequestContext.getInvokedMethod()" is null
	at io.quarkus.rest.client.reactive.jackson.runtime.serialisers.JacksonUtil.getObjectMapperFromContext(JacksonUtil.java:36)
	at io.quarkus.rest.client.reactive.jackson.runtime.serialisers.ClientJacksonMessageBodyReader.getEffectiveReader(ClientJacksonMessageBodyReader.java:69)
	at io.quarkus.rest.client.reactive.jackson.runtime.serialisers.ClientJacksonMessageBodyReader.readFrom(ClientJacksonMessageBodyReader.java:51)
	at org.jboss.resteasy.reactive.client.impl.ClientReaderInterceptorContextImpl.proceed(ClientReaderInterceptorContextImpl.java:86)
	at org.jboss.resteasy.reactive.client.impl.ClientSerialisers.invokeClientReader(ClientSerialisers.java:160)
	at org.jboss.resteasy.reactive.client.impl.ClientResponseImpl.readEntity(ClientResponseImpl.java:59)
	at org.jboss.resteasy.reactive.common.jaxrs.ResponseImpl.readEntity(ResponseImpl.java:129)
	at org.acme.GreetingResource.helloInvoker(GreetingResource.java:36)
	at org.acme.GreetingResource$quarkusrestinvoker$helloInvoker_2f6939943ef199b65f5f8602b2006312f4d1106f.invoke(Unknown Source)
	at org.jboss.resteasy.reactive.server.handlers.InvocationHandler.handle(InvocationHandler.java:29)
	at io.quarkus.resteasy.reactive.server.runtime.QuarkusResteasyReactiveRequestContext.invokeHandler(QuarkusResteasyReactiveRequestContext.java:141)
	at org.jboss.resteasy.reactive.common.core.AbstractResteasyReactiveContext.run(AbstractResteasyReactiveContext.java:147)
	at io.quarkus.vertx.core.runtime.VertxCoreRecorder$14.runWith(VertxCoreRecorder.java:635)
	at org.jboss.threads.EnhancedQueueExecutor$Task.doRunWith(EnhancedQueueExecutor.java:2516)
	at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2495)
	at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1521)
	at org.jboss.threads.DelegatingRunnable.run(DelegatingRunnable.java:11)
	at org.jboss.threads.ThreadLocalResettingRunnable.run(ThreadLocalResettingRunnable.java:11)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:1575)`

How to Reproduce?

man-rest-client.zip

Unzip
mvn quarkus:dev
curl localhost:8080/hello-invoker
error
change version in pom to 3.12.3
curl localhost:8080/hello-invoker
works

Output of uname -a or ver

Microsoft Windows [Version 10.0.26100.3194]

Output of java -version

openjdk 23.0.2 2025-01-21 OpenJDK Runtime Environment Temurin-23.0.2+7 (build 23.0.2+7) OpenJDK 64-Bit Server VM Temurin-23.0.2+7 (build 23.0.2+7, mixed mode, sharing)

Quarkus version or git rev

3.12.3, 3.13.0

Build tool (ie. output of mvnw --version or gradlew --version)

Apache Maven 3.9.9 (8e8579a9e76f7d015ee5ec7bfcdc97d260186937) Maven home: C:\eclipse\tools\java\maven Java version: 23.0.2, vendor: Eclipse Adoptium, runtime: C:\eclipse\tools\java\23 Default locale: de_DE, platform encoding: UTF-8 OS name: "windows 11", version: "10.0", arch: "amd64", family: "windows"

Additional information

No response

[quarkus-bot]

/cc @cescoffier (rest-client), @geoand (rest-client)

[geoand]

Good point!

#46413 fixes the issue