Merge branch '5.1.x'

spring-context/src/main/java/org/springframework/jmx/access/MBeanClientInterceptor.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.
@@ -658,6 +658,9 @@ public class MBeanClientInterceptor
 			if (this == other) {
 				return true;
 			}
+			if (!(other instanceof MethodCacheKey)) {
+				return false;
+			}
 			MethodCacheKey otherKey = (MethodCacheKey) other;
 			return (this.name.equals(otherKey.name) && Arrays.equals(this.parameterTypes, otherKey.parameterTypes));
 		}