diff --git a/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/DefaultMetadataExtractor.java b/spring-messaging/src/main/java/org/springframework/messaging/rsocket/DefaultMetadataExtractor.java
similarity index 95%
rename from spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/DefaultMetadataExtractor.java
rename to spring-messaging/src/main/java/org/springframework/messaging/rsocket/DefaultMetadataExtractor.java
index bc008862d1..ada40d92ea 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/DefaultMetadataExtractor.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/rsocket/DefaultMetadataExtractor.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.messaging.rsocket.annotation.support;
+package org.springframework.messaging.rsocket;
 
 import java.util.Collections;
 import java.util.HashMap;
@@ -31,7 +31,6 @@ import org.springframework.core.io.buffer.DataBuffer;
 import org.springframework.core.io.buffer.DataBufferFactory;
 import org.springframework.core.io.buffer.NettyDataBufferFactory;
 import org.springframework.lang.Nullable;
-import org.springframework.messaging.rsocket.RSocketStrategies;
 import org.springframework.util.Assert;
 import org.springframework.util.MimeType;
 
@@ -61,7 +60,7 @@ public class DefaultMetadataExtractor implements MetadataExtractor {
 		Assert.notNull(strategies, "RSocketStrategies is required");
 		this.rsocketStrategies = strategies;
 		// TODO: remove when rsocket-core API available
-		metadataToExtract(MessagingRSocket.ROUTING, String.class, ROUTE_KEY);
+		metadataToExtract(MetadataExtractor.ROUTING, String.class, ROUTE_KEY);
 	}
 
 
@@ -131,7 +130,7 @@ public class DefaultMetadataExtractor implements MetadataExtractor {
 	@Override
 	public Map<String, Object> extract(Payload payload, MimeType metadataMimeType) {
 		Map<String, Object> result = new HashMap<>();
-		if (metadataMimeType.equals(MessagingRSocket.COMPOSITE_METADATA)) {
+		if (metadataMimeType.equals(COMPOSITE_METADATA)) {
 			for (CompositeMetadata.Entry entry : new CompositeMetadata(payload.metadata(), false)) {
 				processEntry(entry.getContent(), entry.getMimeType(), result);
 			}
@@ -149,7 +148,7 @@ public class DefaultMetadataExtractor implements MetadataExtractor {
 			entryProcessor.process(content, result);
 			return;
 		}
-		if (MessagingRSocket.ROUTING.toString().equals(mimeType)) {
+		if (MetadataExtractor.ROUTING.toString().equals(mimeType)) {
 			// TODO: use rsocket-core API when available
 		}
 	}
diff --git a/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/MetadataExtractor.java b/spring-messaging/src/main/java/org/springframework/messaging/rsocket/MetadataExtractor.java
similarity index 83%
rename from spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/MetadataExtractor.java
rename to spring-messaging/src/main/java/org/springframework/messaging/rsocket/MetadataExtractor.java
index ad48da526d..580b702da5 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/MetadataExtractor.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/rsocket/MetadataExtractor.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.messaging.rsocket.annotation.support;
+package org.springframework.messaging.rsocket;
 
 import java.util.Map;
 
@@ -38,6 +38,16 @@ public interface MetadataExtractor {
 	 */
 	String ROUTE_KEY = "route";
 
+	/**
+	 * Constant for mime type {@code message/x.rsocket.composite-metadata.v0}.
+	 */
+	MimeType COMPOSITE_METADATA = new MimeType("message", "x.rsocket.composite-metadata.v0");
+
+	/**
+	 * Constant for mime type {@code message/x.rsocket.routing.v0}.
+	 */
+	MimeType ROUTING = new MimeType("message", "x.rsocket.routing.v0");
+
 
 	/**
 	 * Extract a map of values from the given {@link Payload} metadata.
diff --git a/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/ClientResponderFactory.java b/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/ClientResponderFactory.java
index ba76c2913c..14053dfbae 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/ClientResponderFactory.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/ClientResponderFactory.java
@@ -22,6 +22,7 @@ import io.rsocket.RSocketFactory;
 
 import org.springframework.messaging.handler.invocation.reactive.ArgumentResolverConfigurer;
 import org.springframework.messaging.handler.invocation.reactive.ReturnValueHandlerConfigurer;
+import org.springframework.messaging.rsocket.MetadataExtractor;
 import org.springframework.messaging.rsocket.RSocketStrategies;
 import org.springframework.util.RouteMatcher;
 
diff --git a/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/DefaultClientResponderFactory.java b/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/DefaultClientResponderFactory.java
index db412dfc2e..f273f883ad 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/DefaultClientResponderFactory.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/DefaultClientResponderFactory.java
@@ -24,6 +24,7 @@ import io.rsocket.RSocketFactory;
 import org.springframework.lang.Nullable;
 import org.springframework.messaging.handler.invocation.reactive.ArgumentResolverConfigurer;
 import org.springframework.messaging.handler.invocation.reactive.ReturnValueHandlerConfigurer;
+import org.springframework.messaging.rsocket.MetadataExtractor;
 import org.springframework.messaging.rsocket.RSocketStrategies;
 import org.springframework.util.Assert;
 import org.springframework.util.RouteMatcher;
diff --git a/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/MessagingRSocket.java b/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/MessagingRSocket.java
index 800f86298f..1f5f7bd136 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/MessagingRSocket.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/MessagingRSocket.java
@@ -40,6 +40,7 @@ import org.springframework.messaging.MessageHeaders;
 import org.springframework.messaging.ReactiveMessageHandler;
 import org.springframework.messaging.handler.DestinationPatternsMessageCondition;
 import org.springframework.messaging.handler.invocation.reactive.HandlerMethodReturnValueHandler;
+import org.springframework.messaging.rsocket.MetadataExtractor;
 import org.springframework.messaging.rsocket.PayloadUtils;
 import org.springframework.messaging.rsocket.RSocketRequester;
 import org.springframework.messaging.support.MessageBuilder;
@@ -60,11 +61,6 @@ import org.springframework.util.RouteMatcher;
  */
 class MessagingRSocket extends AbstractRSocket {
 
-	static final MimeType COMPOSITE_METADATA = new MimeType("message", "x.rsocket.composite-metadata.v0");
-
-	static final MimeType ROUTING = new MimeType("message", "x.rsocket.routing.v0");
-
-
 	private final MimeType dataMimeType;
 
 	private final MimeType metadataMimeType;
diff --git a/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/RSocketMessageHandler.java b/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/RSocketMessageHandler.java
index e8d79e6402..dd9678272b 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/RSocketMessageHandler.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/rsocket/annotation/support/RSocketMessageHandler.java
@@ -40,6 +40,8 @@ import org.springframework.messaging.handler.DestinationPatternsMessageCondition
 import org.springframework.messaging.handler.annotation.MessageMapping;
 import org.springframework.messaging.handler.annotation.reactive.MessageMappingMessageHandler;
 import org.springframework.messaging.handler.invocation.reactive.HandlerMethodReturnValueHandler;
+import org.springframework.messaging.rsocket.DefaultMetadataExtractor;
+import org.springframework.messaging.rsocket.MetadataExtractor;
 import org.springframework.messaging.rsocket.RSocketRequester;
 import org.springframework.messaging.rsocket.RSocketStrategies;
 import org.springframework.messaging.rsocket.annotation.ConnectMapping;
@@ -74,7 +76,7 @@ public class RSocketMessageHandler extends MessageMappingMessageHandler {
 	@Nullable
 	private MimeType defaultDataMimeType;
 
-	private MimeType defaultMetadataMimeType = MessagingRSocket.COMPOSITE_METADATA;
+	private MimeType defaultMetadataMimeType = MetadataExtractor.COMPOSITE_METADATA;
 
 
 	/**
diff --git a/spring-messaging/src/test/java/org/springframework/messaging/rsocket/annotation/support/DefaultMetadataExtractorTests.java b/spring-messaging/src/test/java/org/springframework/messaging/rsocket/DefaultMetadataExtractorTests.java
similarity index 90%
rename from spring-messaging/src/test/java/org/springframework/messaging/rsocket/annotation/support/DefaultMetadataExtractorTests.java
rename to spring-messaging/src/test/java/org/springframework/messaging/rsocket/DefaultMetadataExtractorTests.java
index 44e13c69c6..8e48972134 100644
--- a/spring-messaging/src/test/java/org/springframework/messaging/rsocket/annotation/support/DefaultMetadataExtractorTests.java
+++ b/spring-messaging/src/test/java/org/springframework/messaging/rsocket/DefaultMetadataExtractorTests.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.messaging.rsocket.annotation.support;
+package org.springframework.messaging.rsocket;
 
 import java.time.Duration;
 import java.util.Map;
@@ -31,16 +31,13 @@ import reactor.core.publisher.Mono;
 import org.springframework.core.codec.CharSequenceEncoder;
 import org.springframework.core.codec.StringDecoder;
 import org.springframework.core.io.buffer.DataBufferFactory;
-import org.springframework.messaging.rsocket.LeakAwareNettyDataBufferFactory;
-import org.springframework.messaging.rsocket.RSocketRequester;
-import org.springframework.messaging.rsocket.RSocketStrategies;
 import org.springframework.util.Assert;
 import org.springframework.util.MimeType;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.springframework.messaging.rsocket.annotation.support.MessagingRSocket.COMPOSITE_METADATA;
-import static org.springframework.messaging.rsocket.annotation.support.MessagingRSocket.ROUTING;
-import static org.springframework.messaging.rsocket.annotation.support.MetadataExtractor.ROUTE_KEY;
+import static org.springframework.messaging.rsocket.MetadataExtractor.COMPOSITE_METADATA;
+import static org.springframework.messaging.rsocket.MetadataExtractor.ROUTE_KEY;
+import static org.springframework.messaging.rsocket.MetadataExtractor.ROUTING;
 import static org.springframework.util.MimeTypeUtils.TEXT_HTML;
 import static org.springframework.util.MimeTypeUtils.TEXT_PLAIN;
 import static org.springframework.util.MimeTypeUtils.TEXT_XML;