diff --git a/spring-context/src/test/java/org/springframework/context/event/EventPublicationInterceptorTests.java b/spring-context/src/test/java/org/springframework/context/event/EventPublicationInterceptorTests.java
index 772472dd11..dc298c2264 100644
--- a/spring-context/src/test/java/org/springframework/context/event/EventPublicationInterceptorTests.java
+++ b/spring-context/src/test/java/org/springframework/context/event/EventPublicationInterceptorTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 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.
@@ -129,7 +129,7 @@ public class EventPublicationInterceptorTests {
 	public static class FactoryBeanTestListener extends TestListener implements FactoryBean<Object> {
 
 		@Override
-		public Object getObject() throws Exception {
+		public Object getObject() {
 			return "test";
 		}
 
diff --git a/spring-context/src/test/java/org/springframework/context/event/PayloadApplicationEventTests.java b/spring-context/src/test/java/org/springframework/context/event/PayloadApplicationEventTests.java
index c9f9c17996..1b1100bafe 100644
--- a/spring-context/src/test/java/org/springframework/context/event/PayloadApplicationEventTests.java
+++ b/spring-context/src/test/java/org/springframework/context/event/PayloadApplicationEventTests.java
@@ -35,10 +35,10 @@ public class PayloadApplicationEventTests {
 
 	@Test
 	public void testEventClassWithInterface() {
-		ApplicationContext ac = new AnnotationConfigApplicationContext(Listener.class);
-		MyEventClass event = new MyEventClass<>(this, "xyz");
+		ApplicationContext ac = new AnnotationConfigApplicationContext(AuditableListener.class);
+		AuditablePayloadEvent event = new AuditablePayloadEvent<>(this, "xyz");
 		ac.publishEvent(event);
-		assertTrue(ac.getBean(Listener.class).events.contains(event));
+		assertTrue(ac.getBean(AuditableListener.class).events.contains(event));
 	}
 
 
@@ -46,20 +46,17 @@ public class PayloadApplicationEventTests {
 	}
 
 
-	public static class MyEventClass<GT> extends PayloadApplicationEvent<GT> implements Auditable {
+	@SuppressWarnings("serial")
+	public static class AuditablePayloadEvent<T> extends PayloadApplicationEvent<T> implements Auditable {
 
-		public MyEventClass(Object source, GT payload) {
+		public AuditablePayloadEvent(Object source, T payload) {
 			super(source, payload);
 		}
-
-		public String toString() {
-			return "Payload: " + getPayload();
-		}
 	}
 
 
 	@Component
-	public static class Listener {
+	public static class AuditableListener {
 
 		public final List<Auditable> events = new ArrayList<>();
 
diff --git a/spring-jdbc/src/main/java/org/springframework/jdbc/core/JdbcTemplate.java b/spring-jdbc/src/main/java/org/springframework/jdbc/core/JdbcTemplate.java
index 67e7762e28..d9153a4faf 100644
--- a/spring-jdbc/src/main/java/org/springframework/jdbc/core/JdbcTemplate.java
+++ b/spring-jdbc/src/main/java/org/springframework/jdbc/core/JdbcTemplate.java
@@ -612,6 +612,7 @@ public class JdbcTemplate extends JdbcAccessor implements JdbcOperations {
 				((ParameterDisposer) psc).cleanupParameters();
 			}
 			String sql = getSql(psc);
+			psc = null;
 			JdbcUtils.closeStatement(ps);
 			ps = null;
 			DataSourceUtils.releaseConnection(con, getDataSource());
@@ -1053,6 +1054,7 @@ public class JdbcTemplate extends JdbcAccessor implements JdbcOperations {
 				((ParameterDisposer) csc).cleanupParameters();
 			}
 			String sql = getSql(csc);
+			csc = null;
 			JdbcUtils.closeStatement(cs);
 			cs = null;
 			DataSourceUtils.releaseConnection(con, getDataSource());