Auto-unwrap SessionFactoryBuilder-created proxies

SessionFactory proxies created by (Annotation)SessionFactoryBuilder now
implement InfrastructureProxy to ensure they are automatically unwrapped
for transaction resource management purposes.

Issue: SPR-8492

org.springframework.orm/src/main/java/org/springframework/orm/hibernate3/SessionFactoryBuilderSupport.java

@@ -52,6 +52,7 @@ import org.hibernate.transaction.JTATransactionFactory;
 import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.DisposableBean;
 import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.core.InfrastructureProxy;
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.core.io.Resource;
 import org.springframework.dao.DataAccessException;
@@ -566,6 +567,7 @@ public abstract class SessionFactoryBuilderSupport<This extends SessionFactoryBu
 			new Class<?>[] {
 				SessionFactory.class,
 				SessionFactoryImplementor.class,
+				InfrastructureProxy.class,
 				DisposableBean.class
 			},
 			new InvocationHandler() {
@@ -573,6 +575,9 @@ public abstract class SessionFactoryBuilderSupport<This extends SessionFactoryBu
 					if (ReflectionUtils.isToStringMethod(method)) {
 						return String.format("DisposableBean proxy for SessionFactory [%s]", rawSf.toString());
 					}
+					if (method.equals(InfrastructureProxy.class.getMethod("getWrappedObject"))) {
+						return rawSf;
+					}
 					if (method.equals(DisposableBean.class.getMethod("destroy"))) {
 						closeHibernateSessionFactory(SessionFactoryBuilderSupport.this, rawSf);
 						rawSf.close();