Fix SNAPSHOT builds

- Stop using deprecated RSocket APIs
- Update SNAPSHOT build to use Boot SNAPSHOT

Jenkinsfile

@@ -89,7 +89,7 @@ try {
 							 "GRADLE_ENTERPRISE_CACHE_USERNAME=${GRADLE_ENTERPRISE_CACHE_USERNAME}",
 							 "GRADLE_ENTERPRISE_CACHE_PASSWORD=${GRADLE_ENTERPRISE_CACHE_PASSWORD}",
 							 "GRADLE_ENTERPRISE_ACCESS_KEY=${GRADLE_ENTERPRISE_ACCESS_KEY}"]) {
-							sh "./gradlew test -PforceMavenRepositories=snapshot -PspringVersion='5.+' -PreactorVersion=20+ -PspringDataVersion=Lovelace-BUILD-SNAPSHOT -PrsocketVersion=1.1.0-SNAPSHOT -PlocksDisabled --stacktrace"
+							sh "./gradlew test -PforceMavenRepositories=snapshot -PspringVersion='5.+' -PreactorVersion='20+' -PspringDataVersion='Lovelace-BUILD-SNAPSHOT' -PrsocketVersion=1.1.0-SNAPSHOT -PspringBootVersion=2.4.0-SNAPSHOT -PlocksDisabled --stacktrace"
 						}
 					}
 				} catch(Exception e) {

rsocket/src/main/java/org/springframework/security/rsocket/authentication/AuthenticationPayloadExchangeConverter.java

@@ -19,8 +19,8 @@ package org.springframework.security.rsocket.authentication;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufAllocator;
 import io.rsocket.metadata.WellKnownMimeType;
-import io.rsocket.metadata.security.AuthMetadataFlyweight;
-import io.rsocket.metadata.security.WellKnownAuthType;
+import io.rsocket.metadata.AuthMetadataCodec;
+import io.rsocket.metadata.WellKnownAuthType;
 import org.springframework.core.codec.ByteArrayDecoder;
 import org.springframework.messaging.rsocket.DefaultMetadataExtractor;
 import org.springframework.messaging.rsocket.MetadataExtractor;
@@ -68,10 +68,10 @@ public class AuthenticationPayloadExchangeConverter implements PayloadExchangeAu
 			return null;
 		}
 		ByteBuf rawAuthentication = ByteBufAllocator.DEFAULT.buffer().writeBytes(authenticationMetadata);
-		if (!AuthMetadataFlyweight.isWellKnownAuthType(rawAuthentication)) {
+		if (!AuthMetadataCodec.isWellKnownAuthType(rawAuthentication)) {
 			return null;
 		}
-		WellKnownAuthType wellKnownAuthType = AuthMetadataFlyweight.decodeWellKnownAuthType(rawAuthentication);
+		WellKnownAuthType wellKnownAuthType = AuthMetadataCodec.readWellKnownAuthType(rawAuthentication);
 		if (WellKnownAuthType.SIMPLE.equals(wellKnownAuthType)) {
 			return simple(rawAuthentication);
 		} else if (WellKnownAuthType.BEARER.equals(wellKnownAuthType)) {
@@ -81,15 +81,15 @@ public class AuthenticationPayloadExchangeConverter implements PayloadExchangeAu
 	}
 
 	private Authentication simple(ByteBuf rawAuthentication) {
-		ByteBuf rawUsername = AuthMetadataFlyweight.decodeUsername(rawAuthentication);
+		ByteBuf rawUsername = AuthMetadataCodec.readUsername(rawAuthentication);
 		String username = rawUsername.toString(StandardCharsets.UTF_8);
-		ByteBuf rawPassword = AuthMetadataFlyweight.decodePassword(rawAuthentication);
+		ByteBuf rawPassword = AuthMetadataCodec.readPassword(rawAuthentication);
 		String password = rawPassword.toString(StandardCharsets.UTF_8);
 		return new UsernamePasswordAuthenticationToken(username, password);
 	}
 
 	private Authentication bearer(ByteBuf rawAuthentication) {
-		char[] rawToken = AuthMetadataFlyweight.decodeBearerTokenAsCharArray(rawAuthentication);
+		char[] rawToken = AuthMetadataCodec.readBearerTokenAsCharArray(rawAuthentication);
 		String token = new String(rawToken);
 		return new BearerTokenAuthenticationToken(token);
 	}

rsocket/src/main/java/org/springframework/security/rsocket/core/PayloadInterceptorRSocket.java

@@ -18,7 +18,6 @@ package org.springframework.security.rsocket.core;
 
 import io.rsocket.Payload;
 import io.rsocket.RSocket;
-import io.rsocket.ResponderRSocket;
 import io.rsocket.util.RSocketProxy;
 import org.reactivestreams.Publisher;
 import org.springframework.security.rsocket.api.PayloadExchangeType;
@@ -31,11 +30,11 @@ import reactor.util.context.Context;
 import java.util.List;
 
 /**
- * Combines the {@link PayloadInterceptor} with a {@link ResponderRSocket}
+ * Combines the {@link PayloadInterceptor} with an {@link RSocketProxy}
  * @author Rob Winch
  * @since 5.2
  */
-class PayloadInterceptorRSocket extends RSocketProxy implements ResponderRSocket {
+class PayloadInterceptorRSocket extends RSocketProxy {
 	private final List<PayloadInterceptor> interceptors;
 
 	private final MimeType metadataMimeType;

rsocket/src/main/java/org/springframework/security/rsocket/metadata/BearerTokenAuthenticationEncoder.java

@@ -18,7 +18,7 @@ package org.springframework.security.rsocket.metadata;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufAllocator;
-import io.rsocket.metadata.security.AuthMetadataFlyweight;
+import io.rsocket.metadata.AuthMetadataCodec;
 import org.reactivestreams.Publisher;
 import org.springframework.core.ResolvableType;
 import org.springframework.core.codec.AbstractEncoder;
@@ -64,7 +64,7 @@ public class BearerTokenAuthenticationEncoder extends
 		String token = credentials.getToken();
 		NettyDataBufferFactory factory = nettyFactory(bufferFactory);
 		ByteBufAllocator allocator = factory.getByteBufAllocator();
-		ByteBuf simpleAuthentication = AuthMetadataFlyweight
+		ByteBuf simpleAuthentication = AuthMetadataCodec
 				.encodeBearerMetadata(allocator, token.toCharArray());
 		return factory.wrap(simpleAuthentication);
 	}

rsocket/src/main/java/org/springframework/security/rsocket/metadata/SimpleAuthenticationEncoder.java

@@ -18,7 +18,7 @@ package org.springframework.security.rsocket.metadata;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufAllocator;
-import io.rsocket.metadata.security.AuthMetadataFlyweight;
+import io.rsocket.metadata.AuthMetadataCodec;
 import org.reactivestreams.Publisher;
 import org.springframework.core.ResolvableType;
 import org.springframework.core.codec.AbstractEncoder;
@@ -67,7 +67,7 @@ public class SimpleAuthenticationEncoder extends
 		String password = credentials.getPassword();
 		NettyDataBufferFactory factory = nettyFactory(bufferFactory);
 		ByteBufAllocator allocator = factory.getByteBufAllocator();
-		ByteBuf simpleAuthentication = AuthMetadataFlyweight
+		ByteBuf simpleAuthentication = AuthMetadataCodec
 				.encodeSimpleMetadata(allocator, username.toCharArray(), password.toCharArray());
 		return factory.wrap(simpleAuthentication);
 	}

rsocket/src/test/java/org/springframework/security/rsocket/authentication/AuthenticationPayloadInterceptorTests.java

@@ -19,7 +19,7 @@ package org.springframework.security.rsocket.authentication;
 import io.netty.buffer.ByteBufAllocator;
 import io.netty.buffer.CompositeByteBuf;
 import io.rsocket.Payload;
-import io.rsocket.metadata.CompositeMetadataFlyweight;
+import io.rsocket.metadata.CompositeMetadataCodec;
 import io.rsocket.metadata.WellKnownMimeType;
 import io.rsocket.util.DefaultPayload;
 import org.junit.Test;
@@ -132,7 +132,7 @@ public class AuthenticationPayloadInterceptorTests {
 
 		ByteBufAllocator allocator = ByteBufAllocator.DEFAULT;
 		CompositeByteBuf metadata = allocator.compositeBuffer();
-		CompositeMetadataFlyweight.encodeAndAddMetadata(
+		CompositeMetadataCodec.encodeAndAddMetadata(
 				metadata, allocator, mimeType.toString(), NettyDataBufferFactory.toByteBuf(dataBuffer));
 
 		return DefaultPayload.create(allocator.buffer(),