diff --git a/src/main/java/io/swagger/codegen/v3/generators/DefaultCodegenConfig.java b/src/main/java/io/swagger/codegen/v3/generators/DefaultCodegenConfig.java
index 697c30c6c8..b2ff6c329e 100644
--- a/src/main/java/io/swagger/codegen/v3/generators/DefaultCodegenConfig.java
+++ b/src/main/java/io/swagger/codegen/v3/generators/DefaultCodegenConfig.java
@@ -1241,6 +1241,9 @@ public String toModelName(final String name) {
      * @return Codegen Model object
      */
     public CodegenModel fromModel(String name, Schema schema) {
+        if (openAPI != null && openAPI.getComponents() != null && openAPI.getComponents().getSchemas() != null) {
+            return fromModel(name, schema, openAPI.getComponents().getSchemas());
+        }
         return fromModel(name, schema, null);
     }
 
diff --git a/src/main/java/io/swagger/codegen/v3/generators/SchemaHandler.java b/src/main/java/io/swagger/codegen/v3/generators/SchemaHandler.java
index 8c91a4384d..e9cf7638be 100644
--- a/src/main/java/io/swagger/codegen/v3/generators/SchemaHandler.java
+++ b/src/main/java/io/swagger/codegen/v3/generators/SchemaHandler.java
@@ -17,6 +17,7 @@
 
 public class SchemaHandler implements ISchemaHandler {
 
+    public static final String ALL_OF_PREFFIX = "AllOf";
     public static final String ONE_OF_PREFFIX = "OneOf";
     public static final String ANY_OF_PREFFIX = "AnyOf";
     public static final String ARRAY_ITEMS_SUFFIX = "Items";
@@ -99,7 +100,13 @@ protected CodegenModel processComposedSchema(String name, ComposedSchema compose
     }
 
     protected CodegenModel processComposedSchema(String codegenModelName, CodegenProperty codegenProperty, ComposedSchema composedSchema, Map<String, CodegenModel> allModels) {
-        List<Schema> schemas = composedSchema.getOneOf();
+        List<Schema> schemas = composedSchema.getAllOf();
+        if (schemas != null && !schemas.isEmpty()) {
+            final CodegenModel composedModel = codegenConfig.fromModel(ALL_OF_PREFFIX + codegenModelName, composedSchema);
+            this.updatePropertyDataType(codegenProperty, composedModel);
+            return composedModel;
+        }
+        schemas = composedSchema.getOneOf();
         CodegenModel composedModel = this.createComposedModel(ONE_OF_PREFFIX + codegenModelName, schemas);
         if (composedModel == null) {
             schemas = composedSchema.getAnyOf();
@@ -109,10 +116,7 @@ protected CodegenModel processComposedSchema(String codegenModelName, CodegenPro
             }
         }
         this.addInterfaces(schemas, composedModel, allModels);
-        codegenProperty.datatype = composedModel.getClassname();
-        codegenProperty.datatypeWithEnum = composedModel.getClassname();
-        codegenProperty.baseType = composedModel.getClassname();
-        codegenProperty.complexType = composedModel.getClassname();
+        this.updatePropertyDataType(codegenProperty, composedModel);
         return composedModel;
     }
 
@@ -221,4 +225,11 @@ protected void updateArrayModel(CodegenModel codegenModel, String schemaName, Ar
 
         arraySchema.setItems(items);
     }
+
+    private void updatePropertyDataType(CodegenProperty codegenProperty, CodegenModel composedModel) {
+        codegenProperty.datatype = composedModel.getClassname();
+        codegenProperty.datatypeWithEnum = composedModel.getClassname();
+        codegenProperty.baseType = composedModel.getClassname();
+        codegenProperty.complexType = composedModel.getClassname();
+    }
 }
diff --git a/src/main/java/io/swagger/codegen/v3/generators/nodejs/NodeJSServerCodegen.java b/src/main/java/io/swagger/codegen/v3/generators/nodejs/NodeJSServerCodegen.java
index bac8729c75..82c7b3b6d6 100644
--- a/src/main/java/io/swagger/codegen/v3/generators/nodejs/NodeJSServerCodegen.java
+++ b/src/main/java/io/swagger/codegen/v3/generators/nodejs/NodeJSServerCodegen.java
@@ -325,6 +325,7 @@ public void processOpts() {
 
     @Override
     public void preprocessOpenAPI(OpenAPI openAPI) {
+        this.openAPI = openAPI;
         URL url = URLPathUtil.getServerURL(openAPI);
         String host = URLPathUtil.LOCAL_HOST;
         String port = "8080";
diff --git a/src/main/java/io/swagger/codegen/v3/generators/python/PythonFlaskConnexionCodegen.java b/src/main/java/io/swagger/codegen/v3/generators/python/PythonFlaskConnexionCodegen.java
index 3340fa74ce..2c91368e39 100644
--- a/src/main/java/io/swagger/codegen/v3/generators/python/PythonFlaskConnexionCodegen.java
+++ b/src/main/java/io/swagger/codegen/v3/generators/python/PythonFlaskConnexionCodegen.java
@@ -330,6 +330,7 @@ public String getSchemaType(Schema p) {
 
     @Override
     public void preprocessOpenAPI(OpenAPI openAPI) {
+        super.preprocessOpenAPI(openAPI);
         final Paths paths = openAPI.getPaths();
         addRouterControllerExtensions(paths);
         final Map<String, SecurityScheme> securitySchemes = openAPI.getComponents() != null ? openAPI.getComponents().getSecuritySchemes() : null;