From 27471e055581406b8cc2feef927e336234ef1fa6 Mon Sep 17 00:00:00 2001
From: Juergen Hoeller <jhoeller@vmware.com>
Date: Mon, 5 Dec 2011 21:34:44 +0000
Subject: [PATCH] added support for JPA 2.1 unwrap method on
 EntityManagerFactory interface

---
 .../orm/jpa/AbstractEntityManagerFactoryBean.java          | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/org.springframework.orm/src/main/java/org/springframework/orm/jpa/AbstractEntityManagerFactoryBean.java b/org.springframework.orm/src/main/java/org/springframework/orm/jpa/AbstractEntityManagerFactoryBean.java
index 555c6a51af..46f9e167a9 100644
--- a/org.springframework.orm/src/main/java/org/springframework/orm/jpa/AbstractEntityManagerFactoryBean.java
+++ b/org.springframework.orm/src/main/java/org/springframework/orm/jpa/AbstractEntityManagerFactoryBean.java
@@ -507,6 +507,13 @@ public abstract class AbstractEntityManagerFactoryBean implements
 					// Use hashCode of EntityManagerFactory proxy.
 					return System.identityHashCode(proxy);
 				}
+				else if (method.getName().equals("unwrap")) {
+					// Handle JPA 2.1 unwrap method - could be a proxy match.
+					Class targetClass = (Class) args[0];
+					if (targetClass == null || targetClass.isInstance(proxy)) {
+						return proxy;
+					}
+				}
 				return this.entityManagerFactoryBean.invokeProxyMethod(method, args);
 			}
 			catch (InvocationTargetException ex) {