From ee12a6f7ee32c841adbb2203bb54c0cfdec2d3a3 Mon Sep 17 00:00:00 2001
From: William Cheng <wing328hk@gmail.com>
Date: Sat, 20 Feb 2021 11:49:31 +0800
Subject: [PATCH] revise invalid spec error message (#8735)

---
 .../main/java/org/openapitools/codegen/DefaultGenerator.java   | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultGenerator.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultGenerator.java
index e752c710c94..9fde6eaa047 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultGenerator.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultGenerator.java
@@ -832,9 +832,8 @@ public class DefaultGenerator implements Generator {
 
     @Override
     public List<File> generate() {
-
         if (openAPI == null) {
-            throw new RuntimeException("missing OpenAPI input!");
+            throw new RuntimeException("Issues with the OpenAPI input. Possible causes: invalid/missing spec, malformed JSON/YAML files, etc.");
         }
 
         if (config == null) {