Consistent suppression of get/clearWarnings without target connection

See gh-23346

spring-jdbc/src/main/java/org/springframework/jdbc/datasource/LazyConnectionDataSourceProxy.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -354,18 +354,12 @@ public class LazyConnectionDataSourceProxy extends DelegatingDataSource {
 					this.holdability = (Integer) args[0];
 					return null;
 				}
-				else if (method.getName().equals("commit")) {
+				else if (method.getName().equals("commit") || method.getName().equals("rollback")) {
 					// Ignore: no statements created yet.
 					return null;
 				}
-				else if (method.getName().equals("rollback")) {
-					// Ignore: no statements created yet.
-					return null;
-				}
-				else if (method.getName().equals("getWarnings")) {
-					return null;
-				}
-				else if (method.getName().equals("clearWarnings")) {
+				else if (method.getName().equals("getWarnings") || method.getName().equals("clearWarnings")) {
+					// Ignore: no warnings to expose yet.
 					return null;
 				}
 				else if (method.getName().equals("close")) {

spring-jdbc/src/main/java/org/springframework/jdbc/datasource/TransactionAwareDataSourceProxy.java

@@ -203,10 +203,6 @@ public class TransactionAwareDataSourceProxy extends DelegatingDataSource {
 					return true;
 				}
 			}
-			else if (method.getName().equals("getWarnings") || method.getName().equals("clearWarnings")) {
-				// Avoid creation of target Connection on pre-close cleanup (e.g. in Hibernate Session)
-				return null;
-			}
 			else if (method.getName().equals("close")) {
 				// Handle close method: only close if not within a transaction.
 				DataSourceUtils.doReleaseConnection(this.target, this.targetDataSource);
@@ -218,6 +214,10 @@ public class TransactionAwareDataSourceProxy extends DelegatingDataSource {
 			}
 
 			if (this.target == null) {
+				if (method.getName().equals("getWarnings") || method.getName().equals("clearWarnings")) {
+					// Avoid creation of target Connection on pre-close cleanup (e.g. Hibernate Session)
+					return null;
+				}
 				if (this.closed) {
 					throw new SQLException("Connection handle already closed");
 				}