Fix fix that child constructor was invalid when having readonly field in parent

Author: hugin78bankdata

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

@@ -52,10 +52,10 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}}{{#vendorExtensi
 {{{.}}}
 {{/vendorExtensions.x-field-extra-annotation}}
 {{#isContainer}}
-  private {{{datatypeWithEnum}}} {{name}}{{#required}} = {{{defaultValue}}}{{/required}}{{^required}} = null{{/required}};
+  protected {{{datatypeWithEnum}}} {{name}}{{#required}} = {{{defaultValue}}}{{/required}}{{^required}} = null{{/required}};
 {{/isContainer}}
 {{^isContainer}}
-  private {{{datatypeWithEnum}}} {{name}}{{#defaultValue}} = {{{.}}}{{/defaultValue}};
+  protected {{{datatypeWithEnum}}} {{name}}{{#defaultValue}} = {{{.}}}{{/defaultValue}};
 {{/isContainer}}
   {{/vars}}
 {{>additional_properties}}

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/microprofile/JavaMicroprofileServerCodegenTest.java

@@ -235,5 +235,31 @@ public void testGeneratedApiExceptionMapperDoesNotHaveProviderAnnotationWhenDisa
                 .assertTypeAnnotations()
                 .doesNotContainWithName("Provider");
     }
+
+    @Test
+    public void testClientCanAccessFieldInParent() throws Exception {
+        File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
+        output.deleteOnExit();
+
+        OpenAPI openAPI = new OpenAPIParser()
+                .readLocation("src/test/resources/bugs/issue_23034.yaml", null, new ParseOptions()).getOpenAPI();
+
+        codegen.setOutputDir(output.getAbsolutePath());
+        codegen.additionalProperties().put(JavaClientCodegen.MICROPROFILE_GLOBAL_EXCEPTION_MAPPER, "false");
+
+        ClientOptInput input = new ClientOptInput()
+                .openAPI(openAPI)
+                .config(codegen);
+
+        List<File> files = new DefaultGenerator().opts(input).generate();
+
+        Map<String, File> filesMap = files.stream()
+                .collect(Collectors.toMap(File::getName, Function.identity()));
+
+        validateJavaSourceFiles(files);
+
+        JavaFileAssert.assertThat(filesMap.get("Parent.java"))
+                .fileContains("protected parentField");
+    }
 }
 

modules/openapi-generator/src/test/resources/bugs/issue_23034.yaml

@@ -0,0 +1,41 @@
+---
+openapi: 3.0.4
+info:
+  title: Reproduce
+  version: 'v1'
+components:
+  schemas:
+    Child:
+      required:
+        - childField1
+      type: object
+      allOf:
+        - $ref: "#/components/schemas/Parent"
+      properties:
+        childField1:
+          type: string
+
+    Parent:
+      required:
+        - parentField
+      type: object
+      properties:
+        parentField:
+          type: string
+          readOnly: true
+      discriminator:
+        propertyName: classType
+        mapping:
+          Child: "#/components/schemas/Child"
+paths:
+  '/v1/reproduce':
+    get:
+      responses:
+        '200':
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/Child'
+          description: 'reproduce'