diff --git a/openapi-generator/src/main/java/io/micronaut/openapi/generator/AbstractMicronautJavaCodegen.java b/openapi-generator/src/main/java/io/micronaut/openapi/generator/AbstractMicronautJavaCodegen.java
index e6af87665e..76cbcef7ee 100644
--- a/openapi-generator/src/main/java/io/micronaut/openapi/generator/AbstractMicronautJavaCodegen.java
+++ b/openapi-generator/src/main/java/io/micronaut/openapi/generator/AbstractMicronautJavaCodegen.java
@@ -879,8 +879,9 @@ public Map<String, ModelsMap> postProcessAllModels(Map<String, ModelsMap> objs)
             var hasParent = model.getParentModel() != null;
             var requiredVarsWithoutDiscriminator = new ArrayList<CodegenProperty>();
             var requiredParentVarsWithoutDiscriminator = new ArrayList<CodegenProperty>();
+            var allVars = new ArrayList<CodegenProperty>();
 
-            processParentModel(model, requiredVarsWithoutDiscriminator, requiredParentVarsWithoutDiscriminator);
+            processParentModel(model, requiredVarsWithoutDiscriminator, requiredParentVarsWithoutDiscriminator, allVars);
 
             var optionalVars = new ArrayList<CodegenProperty>();
             var requiredVars = new ArrayList<CodegenProperty>();
@@ -899,6 +900,7 @@ public Map<String, ModelsMap> postProcessAllModels(Map<String, ModelsMap> objs)
             if (!requiredVarsWithoutDiscriminator.isEmpty()) {
                 model.vendorExtensions.put("requiredVarsWithoutDiscriminator", requiredVarsWithoutDiscriminator);
             }
+            model.vendorExtensions.put("allVars", allVars);
             model.vendorExtensions.put("requiredVars", requiredVars);
             model.vendorExtensions.put("optionalVars", optionalVars);
             model.vendorExtensions.put("areRequiredVarsAndReadOnlyVars", !requiredVarsWithoutDiscriminator.isEmpty() && !model.readOnlyVars.isEmpty());
@@ -942,10 +944,14 @@ public boolean isGenerateHardNullable() {
         return false;
     }
 
-    private void processParentModel(CodegenModel model, List<CodegenProperty> requiredVarsWithoutDiscriminator, List<CodegenProperty> requiredParentVarsWithoutDiscriminator) {
+    private void processParentModel(CodegenModel model, List<CodegenProperty> requiredVarsWithoutDiscriminator,
+                                    List<CodegenProperty> requiredParentVarsWithoutDiscriminator,
+                                    List<CodegenProperty> allVars) {
         var parent = model.getParentModel();
         var hasParent = parent != null;
 
+        allVars.addAll(model.vars);
+
         for (var v : model.requiredVars) {
             boolean isDiscriminator = isDiscriminator(v, model);
             if (!isDiscriminator(v, model) && !containsProp(v, requiredVarsWithoutDiscriminator)) {
@@ -958,7 +964,7 @@ private void processParentModel(CodegenModel model, List<CodegenProperty> requir
             model.parentVars = parent.allVars;
         }
         if (hasParent) {
-            processParentModel(parent, requiredVarsWithoutDiscriminator, requiredParentVarsWithoutDiscriminator);
+            processParentModel(parent, requiredVarsWithoutDiscriminator, requiredParentVarsWithoutDiscriminator, allVars);
         }
     }
 
diff --git a/openapi-generator/src/main/resources/templates/java-micronaut/common/model/pojo.mustache b/openapi-generator/src/main/resources/templates/java-micronaut/common/model/pojo.mustache
index 82f83db2fe..56dede6cd6 100644
--- a/openapi-generator/src/main/resources/templates/java-micronaut/common/model/pojo.mustache
+++ b/openapi-generator/src/main/resources/templates/java-micronaut/common/model/pojo.mustache
@@ -131,6 +131,11 @@ public class {{classname}} {{#parent}}extends {{{parent}}} {{/parent}}{{#vendorE
     {{/vars}}
 
     {{#requiredPropertiesInConstructor}}
+        {{^micronaut_serde_jackson}}
+    public {{classname}}() {
+    }
+
+        {{/micronaut_serde_jackson}}
         {{#formatNoEmptyLines}}
         {{#vendorExtensions.withRequiredVars}}
     public {{classname}}({{#vendorExtensions.requiredVarsWithoutDiscriminator}}{{#isReadOnly}}{{#vendorExtensions.isServer}}{{^-first}}, {{/-first}}{{{datatypeWithEnum}}} {{name}}{{/vendorExtensions.isServer}}{{/isReadOnly}}{{^isReadOnly}}{{^-first}}, {{/-first}}{{{datatypeWithEnum}}} {{name}}{{/isReadOnly}}{{/vendorExtensions.requiredVarsWithoutDiscriminator}}) {
@@ -382,9 +387,9 @@ public class {{classname}} {{#parent}}extends {{{parent}}} {{/parent}}{{#vendorE
     @Override
     public String toString() {
         return "{{classname}}("
-        {{#allVars}}
+        {{#vendorExtensions.allVars}}
             + "{{name}}: " + {{{getter}}}(){{^-last}} + ", "{{/-last}}
-        {{/allVars}}
+        {{/vendorExtensions.allVars}}
             + ")";
     }
 {{/lombok}}
diff --git a/openapi-generator/src/main/resources/templates/kotlin-micronaut/common/model/pojo.mustache b/openapi-generator/src/main/resources/templates/kotlin-micronaut/common/model/pojo.mustache
index 5207fb1c0c..986b402a73 100644
--- a/openapi-generator/src/main/resources/templates/kotlin-micronaut/common/model/pojo.mustache
+++ b/openapi-generator/src/main/resources/templates/kotlin-micronaut/common/model/pojo.mustache
@@ -91,7 +91,7 @@
     }
 
     override fun toString(): String {
-        return "{{classname}}({{#allVars}}{{name}}='${{name}}'{{^-last}}, {{/-last}}{{/allVars}})"
+        return "{{classname}}({{#vendorExtensions.allVars}}{{name}}='${{name}}'{{^-last}}, {{/-last}}{{/vendorExtensions.allVars}})"
     }
     {{/vendorExtensions.withInheritance}}
 
diff --git a/test-suite-java-server-generator/spec.yaml b/test-suite-java-server-generator/spec.yaml
index 4c1778315d..3328d4fb79 100644
--- a/test-suite-java-server-generator/spec.yaml
+++ b/test-suite-java-server-generator/spec.yaml
@@ -43,7 +43,7 @@ paths:
               schema:
                 $ref: '#/components/schemas/SendPrimitivesResponse'
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /sendValidatedPrimitives:
     get:
       operationId: sendValidatedPrimitives
@@ -86,7 +86,7 @@ paths:
               schema:
                 type: string
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /sendDates:
     get:
       operationId: sendDates
@@ -111,7 +111,7 @@ paths:
               schema:
                 $ref: '#/components/schemas/SendDatesResponse'
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /sendParameterEnum:
     get:
       operationId: sendParameterEnum
@@ -234,7 +234,7 @@ paths:
               schema:
                 $ref: '#/components/schemas/SimpleModel'
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /sendListOfSimpleModels:
     post:
       operationId: sendListOfSimpleModels
@@ -276,7 +276,7 @@ paths:
               schema:
                 $ref: '#/components/schemas/ModelWithRequiredProperties'
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /sendDateModel:
     post:
       operationId: sendDateModel
@@ -295,7 +295,7 @@ paths:
               schema:
                 $ref: '#/components/schemas/DateModel'
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /sendEnum:
     post:
       operationId: sendEnum
@@ -315,7 +315,7 @@ paths:
               schema:
                 $ref: '#/components/schemas/ColorEnum'
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /sendEnumList:
     post:
       operationId: sendEnumList
@@ -339,7 +339,7 @@ paths:
                 items:
                   $ref: '#/components/schemas/ColorEnum'
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /sendModelWithMapProperty:
     post:
       operationId: sendModelWithMapProperty
@@ -391,7 +391,7 @@ paths:
               schema:
                 $ref: '#/components/schemas/NestedModel'
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /sendModelWithInnerEnum:
     post:
       operationId: sendModelWithInnerEnum
@@ -411,7 +411,7 @@ paths:
               schema:
                 $ref: '#/components/schemas/ModelWithInnerEnum'
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /sendModelWithEnumList:
     post:
       operationId: sendModelWithEnumList
@@ -431,7 +431,7 @@ paths:
               schema:
                 $ref: '#/components/schemas/ModelWithEnumList'
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /sendModelWithDiscriminator:
     put:
       operationId: sendModelWithDiscriminator
@@ -474,7 +474,7 @@ paths:
                 type: string
                 format: byte
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /sendBytes:
     put:
       operationId: sendBytes
@@ -507,7 +507,7 @@ paths:
               schema:
                 $ref: '#/components/schemas/SimpleModel'
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /getDateTime:
     get:
       operationId: getDateTime
@@ -522,7 +522,7 @@ paths:
                 type: string
                 format: date-time
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /getDateModel:
     get:
       operationId: getDateModel
@@ -536,7 +536,7 @@ paths:
               schema:
                 $ref: '#/components/schemas/DateModel'
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /getSimpleModelWithNonStandardStatus:
     get:
       operationId: getSimpleModelWithNonStandardStatus
@@ -550,7 +550,7 @@ paths:
               schema:
                 $ref: '#/components/schemas/SimpleModel'
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /getModelWithValidatedList:
     get:
       operationId: getModelWithValidatedList
@@ -564,7 +564,7 @@ paths:
               schema:
                 $ref: '#/components/schemas/ModelWithValidatedListProperty'
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /getPaginatedSimpleModel:
     get:
       operationId: getPaginatedSimpleModel
@@ -623,7 +623,7 @@ paths:
               schema:
                 $ref: '#/components/schemas/SimpleModel'
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
   /getDatedSimpleModelWithNonMappedHeader:
     get:
       operationId: getDatedSimpleModelWithNonMappedHeader
@@ -669,7 +669,7 @@ paths:
                 type: string
                 format: binary
         default:
-          $ref: '#/responses/Error'
+          $ref: '#/components/responses/Error'
 
 components:
   schemas: