From 2bc8404f224e6b7d238d0e02840b18ea0837e38f Mon Sep 17 00:00:00 2001
From: David Turanski <dturanski@vmware.com>
Date: Sun, 27 Sep 2020 12:14:37 -0400
Subject: [PATCH] Throw exception on invalid function definition

Resolves #2022
---
 .../cloud/stream/function/FunctionConfiguration.java          | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/spring-cloud-stream/src/main/java/org/springframework/cloud/stream/function/FunctionConfiguration.java b/spring-cloud-stream/src/main/java/org/springframework/cloud/stream/function/FunctionConfiguration.java
index c68c17108..115576b4d 100644
--- a/spring-cloud-stream/src/main/java/org/springframework/cloud/stream/function/FunctionConfiguration.java
+++ b/spring-cloud-stream/src/main/java/org/springframework/cloud/stream/function/FunctionConfiguration.java
@@ -711,6 +711,10 @@ public class FunctionConfiguration {
 							functionBindableProxyDefinition.getConstructorArgumentValues().addGenericArgumentValue(this.streamFunctionProperties);
 							registry.registerBeanDefinition(functionDefinition + "_binding", functionBindableProxyDefinition);
 						}
+						else {
+							throw new IllegalArgumentException("The function definition '" + streamFunctionProperties.getDefinition() +
+									"' is not valid. The referenced function bean or one of its components does not exist");
+						}
 					}
 				}