Update to Coroutine 1.3.0-RC2

This updates brings full interoperability between Reactor and
Coroutines contexts.

Closes gh-22986

build.gradle

@@ -31,7 +31,7 @@ ext {
 	}
 
 	aspectjVersion       = "1.9.4"
-	coroutinesVersion    = "1.3.0-RC"
+	coroutinesVersion    = "1.3.0-RC2"
 	freemarkerVersion    = "2.3.28"
 	groovyVersion        = "2.5.7"
 	hsqldbVersion        = "2.5.0"

spring-core-coroutines/src/main/kotlin/org/springframework/core/CoroutinesUtils.kt

@@ -24,7 +24,7 @@ import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.async
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.reactive.awaitFirstOrNull
-import kotlinx.coroutines.reactive.flow.asPublisher
+import kotlinx.coroutines.reactor.asFlux
 
 import kotlinx.coroutines.reactor.mono
 import reactor.core.publisher.Mono
@@ -68,7 +68,7 @@ internal fun invokeHandlerMethod(method: Method, bean: Any, vararg args: Any?):
 					.let { if (it == Unit) null else it }
 		}.onErrorMap(InvocationTargetException::class.java) { it.targetException }
 		if (function.returnType.classifier == Flow::class) {
-			mono.flatMapMany { (it as Flow<Any>).asPublisher() }
+			mono.flatMapMany { (it as Flow<Any>).asFlux() }
 		}
 		else {
 			mono

spring-core/src/main/java/org/springframework/core/ReactiveAdapterRegistry.java

@@ -28,9 +28,6 @@ import io.reactivex.BackpressureStrategy;
 import io.reactivex.Flowable;
 import kotlinx.coroutines.CompletableDeferredKt;
 import kotlinx.coroutines.Deferred;
-import kotlinx.coroutines.flow.FlowKt;
-import kotlinx.coroutines.reactive.flow.FlowAsPublisherKt;
-import kotlinx.coroutines.reactive.flow.PublisherAsFlowKt;
 import org.reactivestreams.Publisher;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
@@ -97,7 +94,7 @@ public class ReactiveAdapterRegistry {
 		// We can fall back on "reactive-streams-flow-bridge" (once released)
 
 		// Coroutines
-		if (this.reactorPresent && ClassUtils.isPresent("kotlinx.coroutines.reactor.MonoKt", classLoader) && ClassUtils.isPresent("kotlinx.coroutines.reactive.flow.PublisherAsFlowKt", classLoader)) {
+		if (this.reactorPresent && ClassUtils.isPresent("kotlinx.coroutines.reactor.MonoKt", classLoader)) {
 			new CoroutinesRegistrar().registerAdapters(this);
 		}
 	}
@@ -351,9 +348,9 @@ public class ReactiveAdapterRegistry {
 					source -> CoroutinesUtils.monoToDeferred(Mono.from(source)));
 
 			registry.registerReactiveType(
-					ReactiveTypeDescriptor.multiValue(kotlinx.coroutines.flow.Flow.class, FlowKt::emptyFlow),
-					source -> FlowAsPublisherKt.from((kotlinx.coroutines.flow.Flow<?>) source),
-					PublisherAsFlowKt::from
+					ReactiveTypeDescriptor.multiValue(kotlinx.coroutines.flow.Flow.class, kotlinx.coroutines.flow.FlowKt::emptyFlow),
+					source -> kotlinx.coroutines.reactor.FlowKt.asFlux((kotlinx.coroutines.flow.Flow<?>) source),
+					kotlinx.coroutines.reactive.FlowKt::asFlow
 			);
 		}
 	}

spring-messaging/src/main/kotlin/org/springframework/messaging/rsocket/RSocketRequesterExtensions.kt

@@ -21,7 +21,7 @@ import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.reactive.awaitFirstOrNull
 import kotlinx.coroutines.reactive.awaitSingle
-import kotlinx.coroutines.reactive.flow.asFlow
+import kotlinx.coroutines.reactive.asFlow
 import org.reactivestreams.Publisher
 import org.springframework.core.ParameterizedTypeReference
 import reactor.core.publisher.Flux

spring-webflux/src/main/kotlin/org/springframework/web/reactive/function/client/ClientResponseExtensions.kt

@@ -20,7 +20,7 @@ import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.reactive.awaitFirstOrNull
 import kotlinx.coroutines.reactive.awaitSingle
-import kotlinx.coroutines.reactive.flow.asFlow
+import kotlinx.coroutines.reactive.asFlow
 import org.springframework.core.ParameterizedTypeReference
 import org.springframework.http.ResponseEntity
 import reactor.core.publisher.Flux

spring-webflux/src/main/kotlin/org/springframework/web/reactive/function/client/WebClientExtensions.kt

@@ -19,7 +19,7 @@ package org.springframework.web.reactive.function.client
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.reactive.awaitSingle
-import kotlinx.coroutines.reactive.flow.asFlow
+import kotlinx.coroutines.reactive.asFlow
 import org.reactivestreams.Publisher
 import org.springframework.core.ParameterizedTypeReference
 import org.springframework.web.reactive.function.client.WebClient.RequestBodySpec

spring-webflux/src/main/kotlin/org/springframework/web/reactive/function/server/ServerRequestExtensions.kt

@@ -20,7 +20,7 @@ import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.reactive.awaitFirstOrNull
 import kotlinx.coroutines.reactive.awaitSingle
-import kotlinx.coroutines.reactive.flow.asFlow
+import kotlinx.coroutines.reactive.asFlow
 import org.springframework.core.ParameterizedTypeReference
 import org.springframework.http.codec.multipart.Part
 import org.springframework.util.MultiValueMap