better null check when normalizing schema

wing328 · wing328 · commit db85d66456c8 · 2026-01-11T21:41:08.000+08:00
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java
@@ -696,7 +696,7 @@ protected boolean isSelfReference(String name, Schema subSchema) {
      */
     public Schema normalizeSchema(Schema schema, Set<Schema> visitedSchemas) {
         // normalize reference schema
-        if (StringUtils.isNotEmpty(schema.get$ref())) {
+        if (schema != null && StringUtils.isNotEmpty(schema.get$ref())) {
             normalizeReferenceSchema(schema);
         }
 

Original file line number	Diff line number	Diff line change
`@@ -696,7 +696,7 @@ protected boolean isSelfReference(String name, Schema subSchema) {`
`696`	`696`	`*/`
`697`	`697`	`public Schema normalizeSchema(Schema schema, Set<Schema> visitedSchemas) {`
`698`	`698`	`// normalize reference schema`
`699`		`- if (StringUtils.isNotEmpty(schema.get$ref())) {`
	`699`	`+ if (schema != null && StringUtils.isNotEmpty(schema.get$ref())) {`
`700`	`700`	`normalizeReferenceSchema(schema);`
`701`	`701`	`}`
`702`	`702`