From 98c2ca76f531c11d757b0f8a071bd771aabb2bf7 Mon Sep 17 00:00:00 2001
From: markfisher <mfisher@pivotal.io>
Date: Mon, 13 Mar 2017 13:38:37 -0400
Subject: [PATCH] avoid Supplier NPE

---
 .../springframework/cloud/function/web/FunctionController.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/spring-cloud-function-web/src/main/java/org/springframework/cloud/function/web/FunctionController.java b/spring-cloud-function-web/src/main/java/org/springframework/cloud/function/web/FunctionController.java
index 4bc94fbdb..113300c79 100644
--- a/spring-cloud-function-web/src/main/java/org/springframework/cloud/function/web/FunctionController.java
+++ b/spring-cloud-function-web/src/main/java/org/springframework/cloud/function/web/FunctionController.java
@@ -76,6 +76,9 @@ public class FunctionController {
 	@SuppressWarnings({ "unchecked", "rawtypes" })
 	public Flux<String> supplier(@PathVariable String name) {
 		Supplier<Object> supplier = functions.lookupSupplier(name);
+		if (supplier == null) {
+			throw new IllegalArgumentException("no such supplier: " + name);
+		}
 		if (!FunctionUtils.isFluxSupplier(supplier)) {
 			supplier = new FluxSupplier(supplier);
 		}