fix more issues

Author: thorstenhirsch

modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java

@@ -3167,12 +3167,15 @@ public CodegenModel fromModel(String name, Schema schema) {
                 parentSchema = allDefinitions.get(m.parentSchema);
             }
 
+            Map<String, Schema> parentProperties = new LinkedHashMap<>();
+            if (parentSchema != null) {
+                addProperties(parentProperties, new ArrayList<>(), parentSchema, new HashSet<>());
+            }
+            
             Set<String> parentReadOnlyNames = new HashSet<>();
-            if (parentSchema != null && parentSchema.getProperties() != null) {
-                for (Map.Entry<String, Schema> entry : ((Map<String, Schema>) parentSchema.getProperties()).entrySet()) {
-                    if (Boolean.TRUE.equals(entry.getValue().getReadOnly())) {
-                        parentReadOnlyNames.add(entry.getKey());
-                    }
+            for (Map.Entry<String, Schema> entry : parentProperties.entrySet()) {
+                if (Boolean.TRUE.equals(entry.getValue().getReadOnly())) {
+                    parentReadOnlyNames.add(entry.getKey());
                 }
             }
 

modules/openapi-generator/src/main/resources/Java/libraries/native/pojo.mustache

@@ -95,7 +95,7 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
   ) {
   this();
   {{#readOnlyVars}}
-    {{#vendorExtensions.x-is-inherited-readonly}}this.set{{nameInPascalCase}}({{name}});{{/vendorExtensions.x-is-inherited-readonly}}{{^vendorExtensions.x-is-inherited-readonly}}this.{{name}} = {{#vendorExtensions.x-is-jackson-optional-nullable}}{{name}} == null ? JsonNullable.<{{{datatypeWithEnum}}}>undefined() : JsonNullable.of({{name}}){{/vendorExtensions.x-is-jackson-optional-nullable}}{{^vendorExtensions.x-is-jackson-optional-nullable}}{{name}}{{/vendorExtensions.x-is-jackson-optional-nullable}};{{/vendorExtensions.x-is-inherited-readonly}}
+    {{#vendorExtensions.x-is-inherited-readonly}}this.{{setter}}({{name}});{{/vendorExtensions.x-is-inherited-readonly}}{{^vendorExtensions.x-is-inherited-readonly}}this.{{name}} = {{#vendorExtensions.x-is-jackson-optional-nullable}}{{name}} == null ? JsonNullable.<{{{datatypeWithEnum}}}>undefined() : JsonNullable.of({{name}}){{/vendorExtensions.x-is-jackson-optional-nullable}}{{^vendorExtensions.x-is-jackson-optional-nullable}}{{name}}{{/vendorExtensions.x-is-jackson-optional-nullable}};{{/vendorExtensions.x-is-inherited-readonly}}
   {{/readOnlyVars}}
   }{{/withXml}}{{/vendorExtensions.x-has-readonly-properties}}
   {{#vars}}