quarkus: IllegalStateException, reactive jaxrs - Don't block when returning void

Describe the bug

Similar case as https://github.com/quarkusio/quarkus/issues/22251 but for cases when void is returned.

Works fine with Quarkus 2.5.4.Final, Fails on Quarkus main

2021-12-21 08:36:35,548 ERROR [io.qua.ver.htt.run.QuarkusErrorHandler] (vert.x-eventloop-thread-22) HTTP Request to /value failed, error id: 611ecf39-7ad2-487c-9410-d942dc50f760-1: java.lang.IllegalStateException: The current thread cannot be blocked: vert.x-eventloop-thread-22
	at io.smallrye.mutiny.operators.uni.UniBlockingAwait.await(UniBlockingAwait.java:30)
	at io.smallrye.mutiny.groups.UniAwait.atMost(UniAwait.java:62)
	at io.smallrye.mutiny.groups.UniAwait.indefinitely(UniAwait.java:43)
	at io.quarkus.cache.runtime.CacheInvalidateInterceptor.intercept(CacheInvalidateInterceptor.java:39)
	at io.quarkus.cache.runtime.CacheInvalidateInterceptor_Bean.intercept(Unknown Source)
	at io.quarkus.arc.impl.InterceptorInvocation.invoke(InterceptorInvocation.java:41)
	at io.quarkus.arc.impl.AroundInvokeInvocationContext.perform(AroundInvokeInvocationContext.java:41)
	at io.quarkus.arc.impl.InvocationContexts.performAroundInvoke(InvocationContexts.java:32)
	at org.acme.ReactiveResource_Subclass.getValue(Unknown Source)
	at org.acme.ReactiveResource$quarkusrestinvoker$getValue_383be323698d81f3c8faf6d402c8e221fd043820.invoke(Unknown Source)
	at org.jboss.resteasy.reactive.server.handlers.InvocationHandler.handle(InvocationHandler.java:29)
	at org.jboss.resteasy.reactive.server.handlers.InvocationHandler.handle(InvocationHandler.java:7)
	at org.jboss.resteasy.reactive.common.core.AbstractResteasyReactiveContext.run(AbstractResteasyReactiveContext.java:141)
	at org.jboss.resteasy.reactive.server.handlers.RestInitialHandler.beginProcessing(RestInitialHandler.java:49)
	at org.jboss.resteasy.reactive.server.vertx.ResteasyReactiveVertxHandler.handle(ResteasyReactiveVertxHandler.java:17)
	at org.jboss.resteasy.reactive.server.vertx.ResteasyReactiveVertxHandler.handle(ResteasyReactiveVertxHandler.java:7)
	at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1193)
...

Expected behavior

Pass the test / return HTTP 204 aka NO_CONTENT

Actual behavior

Test fails with IllegalStateException, log says The current thread cannot be blocked: vert.x-eventloop-thread-22

How to Reproduce?

use reproducer from https://github.com/quarkusio/quarkus/issues/22251 with these adjustments:

@NonBlocking
@Path("/value")
public class ReactiveResource {
    public static final String CACHE_NAME = "mycache";
    @GET
    @CacheInvalidate(cacheName = CACHE_NAME)
    public void getValue() {
    }
}

Change .statusCode(HttpStatus.SC_OK) to .statusCode(HttpStatus.SC_NO_CONTENT) in ReactiveResourceTest

Alternative way:

• Use https://github.com/rsvoboda/quarkus-test-suite/tree/revert.50d90aa
• run mvn clean verify -pl cache/caffeine

Output of uname -a or ver

macOS Monterey

Output of java -version

Java 17

GraalVM version (if different from Java)

No response

Quarkus version or git rev

main

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

No response

Additional information

No response