Avoid a Map lookup when the type is not a primitive

Author: obourgain

spring-core/src/main/java/org/springframework/util/ClassUtils.java

@@ -614,10 +614,11 @@ public static boolean isAssignable(Class<?> lhsType, Class<?> rhsType) {
 			Class<?> resolvedPrimitive = primitiveWrapperTypeMap.get(rhsType);
 			return (lhsType == resolvedPrimitive);
 		}
-		else {
+		else if (rhsType.isPrimitive()) {
 			Class<?> resolvedWrapper = primitiveTypeToWrapperMap.get(rhsType);
 			return (resolvedWrapper != null && lhsType.isAssignableFrom(resolvedWrapper));
 		}
+		return false;
 	}
 
 	/**