diff --git a/spring-web/src/main/java/org/springframework/http/server/reactive/AbstractListenerReadPublisher.java b/spring-web/src/main/java/org/springframework/http/server/reactive/AbstractListenerReadPublisher.java
index 51146b4ee95..321795ed8c7 100644
--- a/spring-web/src/main/java/org/springframework/http/server/reactive/AbstractListenerReadPublisher.java
+++ b/spring-web/src/main/java/org/springframework/http/server/reactive/AbstractListenerReadPublisher.java
@@ -78,7 +78,7 @@ public abstract class AbstractListenerReadPublisher<T> implements Publisher<T> {
 	 * @see ReadListener#onAllDataRead()
 	 * @see org.xnio.ChannelListener#handleEvent(Channel)
 	 */
-	public final void onAllDataRead() {
+	public void onAllDataRead() {
 		if (this.logger.isTraceEnabled()) {
 			this.logger.trace(this.state + " onAllDataRead");
 		}
diff --git a/spring-web/src/main/java/org/springframework/http/server/reactive/UndertowHttpHandlerAdapter.java b/spring-web/src/main/java/org/springframework/http/server/reactive/UndertowHttpHandlerAdapter.java
index d7a1f750cb4..15eb1d4a68c 100644
--- a/spring-web/src/main/java/org/springframework/http/server/reactive/UndertowHttpHandlerAdapter.java
+++ b/spring-web/src/main/java/org/springframework/http/server/reactive/UndertowHttpHandlerAdapter.java
@@ -58,7 +58,7 @@ public class UndertowHttpHandlerAdapter extends HttpHandlerAdapterSupport
 	@Override
 	public void handleRequest(HttpServerExchange exchange) throws Exception {
 
-		ServerHttpRequest request = new UndertowServerHttpRequest(exchange, this.dataBufferFactory);
+		UndertowServerHttpRequest request = new UndertowServerHttpRequest(exchange, this.dataBufferFactory);
 		ServerHttpResponse response = new UndertowServerHttpResponse(exchange, this.dataBufferFactory);
 
 		getHttpHandler().handle(request, response).subscribe(new Subscriber<Void>() {
diff --git a/spring-web/src/main/java/org/springframework/http/server/reactive/UndertowServerHttpRequest.java b/spring-web/src/main/java/org/springframework/http/server/reactive/UndertowServerHttpRequest.java
index 9065bae6a35..9ece475de54 100644
--- a/spring-web/src/main/java/org/springframework/http/server/reactive/UndertowServerHttpRequest.java
+++ b/spring-web/src/main/java/org/springframework/http/server/reactive/UndertowServerHttpRequest.java
@@ -21,6 +21,7 @@ import java.net.URI;
 import java.net.URISyntaxException;
 import java.nio.ByteBuffer;
 
+import io.undertow.connector.ByteBufferPool;
 import io.undertow.connector.PooledByteBuffer;
 import io.undertow.server.HttpServerExchange;
 import io.undertow.server.handlers.Cookie;
@@ -57,7 +58,7 @@ public class UndertowServerHttpRequest extends AbstractServerHttpRequest {
 		super(initUri(exchange), initHeaders(exchange));
 		this.exchange = exchange;
 		this.body = new RequestBodyPublisher(exchange, dataBufferFactory);
-		this.body.registerListener();
+		this.body.registerListener(exchange);
 	}
 
 	private static URI initUri(HttpServerExchange exchange) {
@@ -106,6 +107,7 @@ public class UndertowServerHttpRequest extends AbstractServerHttpRequest {
 		return Flux.from(this.body);
 	}
 
+
 	private static class RequestBodyPublisher extends AbstractListenerReadPublisher<DataBuffer> {
 
 		private final ChannelListener<StreamSourceChannel> readListener =
@@ -118,17 +120,22 @@ public class UndertowServerHttpRequest extends AbstractServerHttpRequest {
 
 		private final DataBufferFactory dataBufferFactory;
 
-		private final PooledByteBuffer pooledByteBuffer;
+		private final ByteBufferPool byteBufferPool;
+
+		private PooledByteBuffer pooledByteBuffer;
 
 		public RequestBodyPublisher(HttpServerExchange exchange,
 				DataBufferFactory dataBufferFactory) {
 			this.requestChannel = exchange.getRequestChannel();
-			this.pooledByteBuffer =
-					exchange.getConnection().getByteBufferPool().allocate();
+			this.byteBufferPool = exchange.getConnection().getByteBufferPool();
 			this.dataBufferFactory = dataBufferFactory;
 		}
 
-		private void registerListener() {
+		private void registerListener(HttpServerExchange exchange) {
+			exchange.addExchangeCompleteListener((ex, next) -> {
+				onAllDataRead();
+				next.proceed();
+			});
 			this.requestChannel.getReadSetter().set(this.readListener);
 			this.requestChannel.getCloseSetter().set(this.closeListener);
 			this.requestChannel.resumeReads();
@@ -141,6 +148,9 @@ public class UndertowServerHttpRequest extends AbstractServerHttpRequest {
 
 		@Override
 		protected DataBuffer read() throws IOException {
+			if (this.pooledByteBuffer == null) {
+				this.pooledByteBuffer = this.byteBufferPool.allocate();
+			}
 			ByteBuffer byteBuffer = this.pooledByteBuffer.getBuffer();
 			int read = this.requestChannel.read(byteBuffer);
 			if (logger.isTraceEnabled()) {
@@ -157,6 +167,14 @@ public class UndertowServerHttpRequest extends AbstractServerHttpRequest {
 			return null;
 		}
 
+		@Override
+		public void onAllDataRead() {
+			if (this.pooledByteBuffer != null && this.pooledByteBuffer.isOpen()) {
+				this.pooledByteBuffer.close();
+			}
+			super.onAllDataRead();
+		}
+
 		private class ReadListener implements ChannelListener<StreamSourceChannel> {
 
 			@Override