SpringSessionSynchronization's beforeCompletion unbinds after disconnect failure as well

Issue: SPR-13089
(cherry picked from commit 8c337a4)

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/SpringSessionSynchronization.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -112,6 +112,7 @@ public class SpringSessionSynchronization implements TransactionSynchronization,
 
 	@Override
 	public void beforeCompletion() {
+		try {
 			Session session = this.sessionHolder.getSession();
 			if (this.sessionHolder.getPreviousFlushMode() != null) {
 				// In case of pre-bound Session, restore previous flush mode.
@@ -119,13 +120,15 @@ public class SpringSessionSynchronization implements TransactionSynchronization,
 			}
 			// Eagerly disconnect the Session here, to make release mode "on_close" work nicely.
 			session.disconnect();
-
+		}
+		finally {
 			// Unbind at this point if it's a new Session...
 			if (this.newSession) {
 				TransactionSynchronizationManager.unbindResource(this.sessionFactory);
 				this.holderActive = false;
 			}
 		}
+	}
 
 	@Override
 	public void afterCommit() {