diff --git a/build.gradle b/build.gradle
index a7d56593ad..9d1d6de719 100644
--- a/build.gradle
+++ b/build.gradle
@@ -438,7 +438,7 @@ project("spring-web") {
 		provided("javax.servlet:javax.servlet-api:3.0.1")
 		provided("javax.servlet.jsp:jsp-api:2.1")
 		provided("javax.activation:activation:1.1")
-		optional("com.caucho:hessian:3.2.1")
+		optional("com.caucho:hessian:4.0.7")
 		optional("rome:rome:1.0")
 		optional("commons-fileupload:commons-fileupload:1.3")
 		optional("org.apache.httpcomponents:httpclient:4.2")
diff --git a/spring-web/src/main/java/org/springframework/remoting/caucho/BurlapClientInterceptor.java b/spring-web/src/main/java/org/springframework/remoting/caucho/BurlapClientInterceptor.java
index 28b6bd5087..fca4c6c975 100644
--- a/spring-web/src/main/java/org/springframework/remoting/caucho/BurlapClientInterceptor.java
+++ b/spring-web/src/main/java/org/springframework/remoting/caucho/BurlapClientInterceptor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -57,7 +57,10 @@ import org.springframework.util.Assert;
  * @see BurlapProxyFactoryBean
  * @see com.caucho.burlap.client.BurlapProxyFactory
  * @see com.caucho.burlap.server.BurlapServlet
+ * @deprecated as of Spring 4.0, since Burlap hasn't evolved in years
+ * and is effectively retired (in contrast to its sibling Hessian)
  */
+@Deprecated
 public class BurlapClientInterceptor extends UrlBasedRemoteAccessor implements MethodInterceptor {
 
 	private BurlapProxyFactory proxyFactory = new BurlapProxyFactory();
diff --git a/spring-web/src/main/java/org/springframework/remoting/caucho/BurlapExporter.java b/spring-web/src/main/java/org/springframework/remoting/caucho/BurlapExporter.java
index eca759bdb7..4eab6397dc 100644
--- a/spring-web/src/main/java/org/springframework/remoting/caucho/BurlapExporter.java
+++ b/spring-web/src/main/java/org/springframework/remoting/caucho/BurlapExporter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -41,7 +41,10 @@ import org.springframework.util.Assert;
  * @see #invoke(java.io.InputStream, java.io.OutputStream)
  * @see BurlapServiceExporter
  * @see SimpleBurlapServiceExporter
+ * @deprecated as of Spring 4.0, since Burlap hasn't evolved in years
+ * and is effectively retired (in contrast to its sibling Hessian)
  */
+@Deprecated
 public class BurlapExporter extends RemoteExporter implements InitializingBean {
 
 	private BurlapSkeleton skeleton;
diff --git a/spring-web/src/main/java/org/springframework/remoting/caucho/BurlapProxyFactoryBean.java b/spring-web/src/main/java/org/springframework/remoting/caucho/BurlapProxyFactoryBean.java
index f15c1eda0e..6872893cbc 100644
--- a/spring-web/src/main/java/org/springframework/remoting/caucho/BurlapProxyFactoryBean.java
+++ b/spring-web/src/main/java/org/springframework/remoting/caucho/BurlapProxyFactoryBean.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -39,7 +39,10 @@ import org.springframework.beans.factory.FactoryBean;
  * @see org.springframework.remoting.caucho.HessianProxyFactoryBean
  * @see org.springframework.remoting.httpinvoker.HttpInvokerProxyFactoryBean
  * @see org.springframework.remoting.rmi.RmiProxyFactoryBean
+ * @deprecated as of Spring 4.0, since Burlap hasn't evolved in years
+ * and is effectively retired (in contrast to its sibling Hessian)
  */
+@Deprecated
 public class BurlapProxyFactoryBean extends BurlapClientInterceptor implements FactoryBean<Object> {
 
 	private Object serviceProxy;
diff --git a/spring-web/src/main/java/org/springframework/remoting/caucho/BurlapServiceExporter.java b/spring-web/src/main/java/org/springframework/remoting/caucho/BurlapServiceExporter.java
index ca25dd79bf..151ca5f24f 100644
--- a/spring-web/src/main/java/org/springframework/remoting/caucho/BurlapServiceExporter.java
+++ b/spring-web/src/main/java/org/springframework/remoting/caucho/BurlapServiceExporter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -48,7 +48,10 @@ import org.springframework.web.util.NestedServletException;
  * @see org.springframework.remoting.caucho.HessianServiceExporter
  * @see org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter
  * @see org.springframework.remoting.rmi.RmiServiceExporter
+ * @deprecated as of Spring 4.0, since Burlap hasn't evolved in years
+ * and is effectively retired (in contrast to its sibling Hessian)
  */
+@Deprecated
 public class BurlapServiceExporter extends BurlapExporter implements HttpRequestHandler {
 
 	/**
diff --git a/spring-web/src/main/java/org/springframework/remoting/caucho/HessianClientInterceptor.java b/spring-web/src/main/java/org/springframework/remoting/caucho/HessianClientInterceptor.java
index ff89f1bb86..ed7f5b3816 100644
--- a/spring-web/src/main/java/org/springframework/remoting/caucho/HessianClientInterceptor.java
+++ b/spring-web/src/main/java/org/springframework/remoting/caucho/HessianClientInterceptor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,6 +23,7 @@ import java.net.MalformedURLException;
 
 import com.caucho.hessian.HessianException;
 import com.caucho.hessian.client.HessianConnectionException;
+import com.caucho.hessian.client.HessianConnectionFactory;
 import com.caucho.hessian.client.HessianProxyFactory;
 import com.caucho.hessian.client.HessianRuntimeException;
 import com.caucho.hessian.io.SerializerFactory;
@@ -44,6 +45,7 @@ import org.springframework.util.Assert;
  * <p>Hessian is a slim, binary RPC protocol.
  * For information on Hessian, see the
  * <a href="http://www.caucho.com/hessian">Hessian website</a>
+ * <b>Note: As of Spring 4.0, this client requires Hessian 4.0 or above.</b>
  *
  * <p>Note: There is no requirement for services accessed with this proxy factory
  * to have been exported using Spring's {@link HessianServiceExporter}, as there is
@@ -96,6 +98,14 @@ public class HessianClientInterceptor extends UrlBasedRemoteAccessor implements
 		this.proxyFactory.getSerializerFactory().setSendCollectionType(sendCollectionType);
 	}
 
+	/**
+	 * Set whether to allow non-serializable types as Hessian arguments
+	 * and return values. Default is "true".
+	 */
+	public void setAllowNonSerializable(boolean allowNonSerializable) {
+		this.proxyFactory.getSerializerFactory().setAllowNonSerializable(allowNonSerializable);
+	}
+
 	/**
 	 * Set whether overloaded methods should be enabled for remote invocations.
 	 * Default is "false".
@@ -142,6 +152,21 @@ public class HessianClientInterceptor extends UrlBasedRemoteAccessor implements
 		this.proxyFactory.setChunkedPost(chunkedPost);
 	}
 
+	/**
+	 * Specify a custom HessianConnectionFactory to use for the Hessian client.
+	 */
+	public void setConnectionFactory(HessianConnectionFactory connectionFactory) {
+		this.proxyFactory.setConnectionFactory(connectionFactory);
+	}
+
+	/**
+	 * Set the socket connect timeout to use for the Hessian client.
+	 * @see com.caucho.hessian.client.HessianProxyFactory#setConnectTimeout
+	 */
+	public void setConnectTimeout(long timeout) {
+		this.proxyFactory.setConnectTimeout(timeout);
+	}
+
 	/**
 	 * Set the timeout to use when waiting for a reply from the Hessian service.
 	 * @see com.caucho.hessian.client.HessianProxyFactory#setReadTimeout
@@ -207,7 +232,7 @@ public class HessianClientInterceptor extends UrlBasedRemoteAccessor implements
 	 */
 	protected Object createHessianProxy(HessianProxyFactory proxyFactory) throws MalformedURLException {
 		Assert.notNull(getServiceInterface(), "'serviceInterface' is required");
-		return proxyFactory.create(getServiceInterface(), getServiceUrl());
+		return proxyFactory.create(getServiceInterface(), getServiceUrl(), getBeanClassLoader());
 	}
 
 
diff --git a/spring-web/src/main/java/org/springframework/remoting/caucho/HessianExporter.java b/spring-web/src/main/java/org/springframework/remoting/caucho/HessianExporter.java
index 5aba1cb154..a714b77f78 100644
--- a/spring-web/src/main/java/org/springframework/remoting/caucho/HessianExporter.java
+++ b/spring-web/src/main/java/org/springframework/remoting/caucho/HessianExporter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,6 +30,7 @@ import com.caucho.hessian.io.HessianDebugInputStream;
 import com.caucho.hessian.io.HessianDebugOutputStream;
 import com.caucho.hessian.io.HessianInput;
 import com.caucho.hessian.io.HessianOutput;
+import com.caucho.hessian.io.HessianRemoteResolver;
 import com.caucho.hessian.io.SerializerFactory;
 import com.caucho.hessian.server.HessianSkeleton;
 import org.apache.commons.logging.Log;
@@ -45,7 +46,7 @@ import org.springframework.util.CommonsLogWriter;
  * <p>Hessian is a slim, binary RPC protocol.
  * For information on Hessian, see the
  * <a href="http://www.caucho.com/hessian">Hessian website</a>.
- * <b>Note: As of Spring 3.0, this exporter requires Hessian 3.2 or above.</b>
+ * <b>Note: As of Spring 4.0, this exporter requires Hessian 4.0 or above.</b>
  *
  * @author Juergen Hoeller
  * @since 2.5.1
@@ -60,6 +61,8 @@ public class HessianExporter extends RemoteExporter implements InitializingBean
 
 	private SerializerFactory serializerFactory = new SerializerFactory();
 
+	private HessianRemoteResolver remoteResolver;
+
 	private Log debugLogger;
 
 	private HessianSkeleton skeleton;
@@ -83,6 +86,22 @@ public class HessianExporter extends RemoteExporter implements InitializingBean
 		this.serializerFactory.setSendCollectionType(sendCollectionType);
 	}
 
+	/**
+	 * Set whether to allow non-serializable types as Hessian arguments
+	 * and return values. Default is "true".
+	 */
+	public void setAllowNonSerializable(boolean allowNonSerializable) {
+		this.serializerFactory.setAllowNonSerializable(allowNonSerializable);
+	}
+
+	/**
+	 * Specify a custom HessianRemoteResolver to use for resolving remote
+	 * object references.
+	 */
+	public void setRemoteResolver(HessianRemoteResolver remoteResolver) {
+		this.remoteResolver = remoteResolver;
+	}
+
 	/**
 	 * Set whether Hessian's debug mode should be enabled, logging to
 	 * this exporter's Commons Logging log. Default is "false".
@@ -193,6 +212,9 @@ public class HessianExporter extends RemoteExporter implements InitializingBean
 				in.setSerializerFactory(this.serializerFactory);
 				out.setSerializerFactory(this.serializerFactory);
 			}
+			if (this.remoteResolver != null) {
+				in.setRemoteResolver(this.remoteResolver);
+			}
 
 			try {
 				skeleton.invoke(in, out);
diff --git a/spring-web/src/main/java/org/springframework/remoting/caucho/HessianProxyFactoryBean.java b/spring-web/src/main/java/org/springframework/remoting/caucho/HessianProxyFactoryBean.java
index 7421d08f01..96325ddbe3 100644
--- a/spring-web/src/main/java/org/springframework/remoting/caucho/HessianProxyFactoryBean.java
+++ b/spring-web/src/main/java/org/springframework/remoting/caucho/HessianProxyFactoryBean.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,6 +26,7 @@ import org.springframework.beans.factory.FactoryBean;
  * <p>Hessian is a slim, binary RPC protocol.
  * For information on Hessian, see the
  * <a href="http://www.caucho.com/hessian">Hessian website</a>
+ * <b>Note: As of Spring 4.0, this proxy factory requires Hessian 4.0 or above.</b>
  *
  * <p>The service URL must be an HTTP URL exposing a Hessian service.
  * For details, see the {@link HessianClientInterceptor} javadoc.
@@ -36,7 +37,6 @@ import org.springframework.beans.factory.FactoryBean;
  * @see #setServiceUrl
  * @see HessianClientInterceptor
  * @see HessianServiceExporter
- * @see org.springframework.remoting.caucho.BurlapProxyFactoryBean
  * @see org.springframework.remoting.httpinvoker.HttpInvokerProxyFactoryBean
  * @see org.springframework.remoting.rmi.RmiProxyFactoryBean
  */
diff --git a/spring-web/src/main/java/org/springframework/remoting/caucho/HessianServiceExporter.java b/spring-web/src/main/java/org/springframework/remoting/caucho/HessianServiceExporter.java
index 4c94d0aa63..a572d080d0 100644
--- a/spring-web/src/main/java/org/springframework/remoting/caucho/HessianServiceExporter.java
+++ b/spring-web/src/main/java/org/springframework/remoting/caucho/HessianServiceExporter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -35,7 +35,7 @@ import org.springframework.web.util.NestedServletException;
  * <p>Hessian is a slim, binary RPC protocol.
  * For information on Hessian, see the
  * <a href="http://www.caucho.com/hessian">Hessian website</a>.
- * <b>Note: As of Spring 3.0, this exporter requires Hessian 3.2 or above.</b>
+ * <b>Note: As of Spring 4.0, this exporter requires Hessian 4.0 or above.</b>
  *
  * <p>Hessian services exported with this class can be accessed by
  * any Hessian client, as there isn't any special handling involved.
@@ -44,7 +44,6 @@ import org.springframework.web.util.NestedServletException;
  * @since 13.05.2003
  * @see HessianClientInterceptor
  * @see HessianProxyFactoryBean
- * @see org.springframework.remoting.caucho.BurlapServiceExporter
  * @see org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter
  * @see org.springframework.remoting.rmi.RmiServiceExporter
  */
diff --git a/spring-web/src/main/java/org/springframework/remoting/caucho/SimpleBurlapServiceExporter.java b/spring-web/src/main/java/org/springframework/remoting/caucho/SimpleBurlapServiceExporter.java
index 6e5471d6ad..d921ab4703 100644
--- a/spring-web/src/main/java/org/springframework/remoting/caucho/SimpleBurlapServiceExporter.java
+++ b/spring-web/src/main/java/org/springframework/remoting/caucho/SimpleBurlapServiceExporter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -44,7 +44,10 @@ import org.springframework.util.FileCopyUtils;
  * @see org.springframework.remoting.caucho.BurlapProxyFactoryBean
  * @see SimpleHessianServiceExporter
  * @see org.springframework.remoting.httpinvoker.SimpleHttpInvokerServiceExporter
+ * @deprecated as of Spring 4.0, since Burlap hasn't evolved in years
+ * and is effectively retired (in contrast to its sibling Hessian)
  */
+@Deprecated
 public class SimpleBurlapServiceExporter extends BurlapExporter implements HttpHandler {
 
 	/**
diff --git a/spring-web/src/main/java/org/springframework/remoting/caucho/SimpleHessianServiceExporter.java b/spring-web/src/main/java/org/springframework/remoting/caucho/SimpleHessianServiceExporter.java
index a4e483657d..d56b1e0e3f 100644
--- a/spring-web/src/main/java/org/springframework/remoting/caucho/SimpleHessianServiceExporter.java
+++ b/spring-web/src/main/java/org/springframework/remoting/caucho/SimpleHessianServiceExporter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -33,7 +33,7 @@ import org.springframework.util.FileCopyUtils;
  * <p>Hessian is a slim, binary RPC protocol.
  * For information on Hessian, see the
  * <a href="http://www.caucho.com/hessian">Hessian website</a>.
- * <b>Note: As of Spring 3.0, this exporter requires Hessian 3.2 or above.</b>
+ * <b>Note: As of Spring 4.0, this exporter requires Hessian 4.0 or above.</b>
  *
  * <p>Hessian services exported with this class can be accessed by
  * any Hessian client, as there isn't any special handling involved.
@@ -42,7 +42,6 @@ import org.springframework.util.FileCopyUtils;
  * @since 2.5.1
  * @see org.springframework.remoting.caucho.HessianClientInterceptor
  * @see org.springframework.remoting.caucho.HessianProxyFactoryBean
- * @see SimpleBurlapServiceExporter
  * @see org.springframework.remoting.httpinvoker.SimpleHttpInvokerServiceExporter
  */
 public class SimpleHessianServiceExporter extends HessianExporter implements HttpHandler {