C++ Httplib server codegen by rajvesh · Pull Request #21724 · OpenAPITools/openapi-generator

rajvesh · 2025-08-10T18:43:34Z

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rajvesh · 2025-08-10T18:49:35Z

Hello @wing328 ,
Previous pull request got closed. I don't know the reason.
(#21672)

This is the same code with rework on your comments from previous.

Thank you.

wing328 · 2025-08-11T12:31:49Z

https://github.com/OpenAPITools/openapi-generator/actions/runs/16865113770/job/47794205903?pr=21724

you can search for toLowerCase in the project and see how other generators call this function to address the build failure

rajvesh · 2025-08-19T05:56:02Z

Hello @wing328 ,
Pushed the new changes. Please check.
Thank you.

wing328 · 2025-08-22T07:38:19Z

still failed

Error:    Run 1: GlobalSettingsTest.testNonStringSystemProperties:33 
expected: "test2"
 but was: null
Error:  Forbidden method invocation: java.lang.String#toLowerCase() [Uses default locale]
Error:    in org.openapitools.codegen.languages.CppHttplibServerCodegen (CppHttplibServerCodegen.java:922)
Error:  Forbidden method invocation: java.lang.String#toUpperCase() [Uses default locale]
Error:    in org.openapitools.codegen.languages.CppHttplibServerCodegen (CppHttplibServerCodegen.java:1050)
Error:  Forbidden method invocation: java.lang.String#toUpperCase() [Uses default locale]
Error:    in org.openapitools.codegen.languages.CppHttplibServerCodegen (CppHttplibServerCodegen.java:1052)
Error:  Forbidden method invocation: java.lang.String#toLowerCase() [Uses default locale]
Error:    in org.openapitools.codegen.languages.CppHttplibServerCodegen (CppHttplibServerCodegen.java:1052)
Error:  Forbidden method invocation: java.lang.String#toLowerCase() [Uses default locale]
Error:    in org.openapitools.codegen.languages.CppHttplibServerCodegen (CppHttplibServerCodegen.java:1054)
Error:  Scanned 561 class file(s) for forbidden API invocations (in 1.22s), 5 error(s).
Error:  Failed to execute goal de.thetaphi:forbiddenapis:3.5.1:check (default) on project openapi-generator: Check for forbidden API calls failed, see log. -> [Help 1]

can you try building the project locally to confirm the fix?

rajvesh · 2025-08-24T14:42:08Z

I am building with this command.It is passing build locally.
./mvnw clean package -DskipTests

wing328 · 2025-08-24T14:43:17Z

please try ./mvnw clean package

wing328 · 2025-08-28T08:03:56Z

please review the build errors when you've time: https://github.com/OpenAPITools/openapi-generator/actions/runs/17289476813/job/49073762692?pr=21724

rajvesh · 2025-08-28T08:10:49Z

please try ./mvnw clean package

With the above command , I am facing errors for maven plugin:

[INFO] openapi-generator-project .......................... SUCCESS [ 2.191 s]
[INFO] openapi-generator-core ............................. SUCCESS [ 4.082 s]
[INFO] openapi-generator (core library) ................... SUCCESS [10:47 min]
[INFO] openapi-generator (executable) ..................... SUCCESS [ 35.143 s]
[INFO] openapi-generator (maven-plugin) ................... FAILURE [01:04 min]
[INFO] openapi-generator-gradle-plugin (maven wrapper) .... SKIPPED
[INFO] openapi-generator-online ........................... SKIPPED

wing328 · 2025-08-28T10:12:38Z

[INFO]
[INFO] --- maven-dependency-plugin:3.8.1:copy-dependencies (default) @ openapi-generator-online ---
[INFO]
[INFO] --- spring-boot-maven-plugin:2.5.14:repackage (default) @ openapi-generator-online ---
[INFO] Replacing main artifact with repackaged archive
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary for openapi-generator-project 7.16.0-SNAPSHOT:
[INFO]
[INFO] openapi-generator-project .......................... SUCCESS [  2.019 s]
[INFO] openapi-generator-core ............................. SUCCESS [  2.947 s]
[INFO] openapi-generator (core library) ................... SUCCESS [06:06 min]
[INFO] openapi-generator (executable) ..................... SUCCESS [ 16.828 s]
[INFO] openapi-generator (maven-plugin) ................... SUCCESS [ 38.142 s]
[INFO] openapi-generator-gradle-plugin (maven wrapper) .... SUCCESS [  2.124 s]
[INFO] openapi-generator-online ........................... SUCCESS [ 34.402 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  07:45 min
[INFO] Finished at: 2025-08-28T18:11:28+08:00
[INFO] ------------------------------------------------------------------------
[INFO] 75 goals, 64 executed, 11 from cache, saving at least 29s
[INFO]
[INFO] Publishing build scan...
[INFO] https://ge.openapi-generator.tech/s/n3o7rpo63ci72

works for me without errors

can you merge the latest master into your branch?

rajvesh · 2026-02-09T09:25:07Z

Hello @wing328 ,
After long time had time to work on this again. please approve the workflows.
Thank you.

rajvesh · 2026-02-09T10:35:38Z

Looks like , The CI/CD errors (such as "Null key for a Map not allowed in JSON" and missing schema warnings) are not related to my changes. I have only modified files relevant to the cpp-httplib-server improvements. The errors originate from test specifications or example files within the OpenAPI Generator test suite, not from my OpenAPI spec or any files I changed. My modifications do not introduce these issues. This is my analysis of these checks failed.

In my local, builds for codegen, tests, and sample code builds are successfull.
Please let me know.

.github/workflows/samples-cpp-httplib-server.yaml

wing328 · 2026-02-09T12:56:42Z

I'm able to repeat the issue locally. I'll take another look to see what I can do to resolve it

Is it correct to say that you've tested with the auto-generated output (C++ server-side code) and it works fine for you?

rajvesh · 2026-02-11T16:31:54Z

I'm able to repeat the issue locally. I'll take another look to see what I can do to resolve it

Is it correct to say that you've tested with the auto-generated output (C++ server-side code) and it works fine for you?

Yes, I am able to create the Jar file with codegen java code and used the same jar file to generate code for cpp-httplib server. And also I am able to build successfully and create a library with cmake using the generated code.

rajvesh · 2026-02-11T17:29:50Z

Hello @wing328 ,
I have modified the workflow file. Please approve the process to start.
Thank you.

rajvesh · 2026-02-11T17:43:25Z

Builds are passed in the workflow. What are the next steps? Please guide.

rajvesh · 2026-02-12T05:04:28Z

When I checked, it is failing because of this error:

2026-02-11T18:23:45.4958927Z Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.openapitools.codegen.online.service.GenApiService
2026-02-11T18:23:45.4959432Z 	at jdk.internal.reflect.GeneratedConstructorAccessor100.newInstance(Unknown Source)

wing328 · 2026-02-12T05:58:33Z

i'll take another look later today

wing328 · 2026-02-12T06:07:42Z

https://github.com/OpenAPITools/openapi-generator/actions/runs/21915647769/job/63288074235?pr=21724

please replace tabs with 4-space

...napi-generator/src/main/java/org/openapitools/codegen/languages/CppHttplibServerCodegen.java

wing328 · 2026-02-12T07:42:57Z

i did a test and found the following in the console:

[main] INFO  o.o.c.l.CppHttplibServerCodegen - Added UNSPECIFIED value to enum Status (needed for safe initialization)
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Set enum values for Status: [UNSPECIFIED, AVAILABLE, PENDING, SOLD]
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Processing enum for variable Status: isEnum=true, _enum=[AVAILABLE, PENDING, SOLD], allowableValues={enumVars=[{name=AVAILABLE, isString=false, value=AVAILABLE}, {name=PENDING, isString=false, value=PENDING}, {name=SOLD, isString=false, value=SOLD}], values=[AVAILABLE, PENDING, SOLD]}
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Added UNSPECIFIED value to enum Status (needed for safe initialization)
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Set enum values for Status: [UNSPECIFIED, AVAILABLE, PENDING, SOLD]
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Model classname: PetOrCategory -> PetOrCategory
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Processing enum for variable Status: isEnum=true, _enum=[AVAILABLE, PENDING, SOLD], allowableValues={enumVars=[{name=AVAILABLE, isString=false, value=AVAILABLE}, {name=PENDING, isString=false, value=PENDING}, {name=SOLD, isString=false, value=SOLD}], values=[AVAILABLE, PENDING, SOLD]}
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Added UNSPECIFIED value to enum Status (needed for safe initialization)
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Set enum values for Status: [UNSPECIFIED, AVAILABLE, PENDING, SOLD]
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Processing enum for variable Status: isEnum=true, _enum=[AVAILABLE, PENDING, SOLD], allowableValues={enumVars=[{name=AVAILABLE, isString=false, value=AVAILABLE}, {name=PENDING, isString=false, value=PENDING}, {name=SOLD, isString=false, value=SOLD}], values=[AVAILABLE, PENDING, SOLD]}
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Added UNSPECIFIED value to enum Status (needed for safe initialization)
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Set enum values for Status: [UNSPECIFIED, AVAILABLE, PENDING, SOLD]
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Model classname: Tag -> Tag
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Model classname: User -> User
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Processing enum for variable UserStatus: isEnum=true, _enum=[_0, _1, _2], allowableValues={enumVars=[{name=_0, isString=false, value=_0}, {name=_1, isString=false, value=_1}, {name=_2, isString=false, value=_2}], values=[_0, _1, _2]}
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Added UNSPECIFIED value to enum UserStatus (needed for safe initialization)
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Set enum values for UserStatus: [UNSPECIFIED, _0, _1, _2]
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Processing enum for variable UserStatus: isEnum=true, _enum=[_0, _1, _2], allowableValues={enumVars=[{name=_0, isString=false, value=_0}, {name=_1, isString=false, value=_1}, {name=_2, isString=false, value=_2}], values=[_0, _1, _2]}
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Added UNSPECIFIED value to enum UserStatus (needed for safe initialization)

should some of these use debug instead of info?

rajvesh

i did a test and found the following in the console:

[main] INFO  o.o.c.l.CppHttplibServerCodegen - Added UNSPECIFIED value to enum Status (needed for safe initialization)
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Set enum values for Status: [UNSPECIFIED, AVAILABLE, PENDING, SOLD]
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Processing enum for variable Status: isEnum=true, _enum=[AVAILABLE, PENDING, SOLD], allowableValues={enumVars=[{name=AVAILABLE, isString=false, value=AVAILABLE}, {name=PENDING, isString=false, value=PENDING}, {name=SOLD, isString=false, value=SOLD}], values=[AVAILABLE, PENDING, SOLD]}
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Added UNSPECIFIED value to enum Status (needed for safe initialization)
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Set enum values for Status: [UNSPECIFIED, AVAILABLE, PENDING, SOLD]
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Model classname: PetOrCategory -> PetOrCategory
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Processing enum for variable Status: isEnum=true, _enum=[AVAILABLE, PENDING, SOLD], allowableValues={enumVars=[{name=AVAILABLE, isString=false, value=AVAILABLE}, {name=PENDING, isString=false, value=PENDING}, {name=SOLD, isString=false, value=SOLD}], values=[AVAILABLE, PENDING, SOLD]}
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Added UNSPECIFIED value to enum Status (needed for safe initialization)
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Set enum values for Status: [UNSPECIFIED, AVAILABLE, PENDING, SOLD]
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Processing enum for variable Status: isEnum=true, _enum=[AVAILABLE, PENDING, SOLD], allowableValues={enumVars=[{name=AVAILABLE, isString=false, value=AVAILABLE}, {name=PENDING, isString=false, value=PENDING}, {name=SOLD, isString=false, value=SOLD}], values=[AVAILABLE, PENDING, SOLD]}
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Added UNSPECIFIED value to enum Status (needed for safe initialization)
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Set enum values for Status: [UNSPECIFIED, AVAILABLE, PENDING, SOLD]
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Model classname: Tag -> Tag
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Model classname: User -> User
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Processing enum for variable UserStatus: isEnum=true, _enum=[_0, _1, _2], allowableValues={enumVars=[{name=_0, isString=false, value=_0}, {name=_1, isString=false, value=_1}, {name=_2, isString=false, value=_2}], values=[_0, _1, _2]}
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Added UNSPECIFIED value to enum UserStatus (needed for safe initialization)
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Set enum values for UserStatus: [UNSPECIFIED, _0, _1, _2]
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Processing enum for variable UserStatus: isEnum=true, _enum=[_0, _1, _2], allowableValues={enumVars=[{name=_0, isString=false, value=_0}, {name=_1, isString=false, value=_1}, {name=_2, isString=false, value=_2}], values=[_0, _1, _2]}
[main] INFO  o.o.c.l.CppHttplibServerCodegen - Added UNSPECIFIED value to enum UserStatus (needed for safe initialization)

should some of these use debug instead of info?

Ok, I will change to Debug. Also the label is not client:C++. This code is for server:C++.

wing328 · 2026-02-12T07:50:26Z

Fixed the label 👍

wing328 · 2026-02-12T07:51:24Z

Ok, I will change to Debug.

To be clear, it's entirely up to you. I just found the output too verbose.

rajvesh · 2026-02-12T07:55:04Z

I request , Could you please remove this username as reviewer. vasireddyrajesh. This is my another username. Let the username be consistent.

Supports: All OpenAPI 3.x data types: primitives, arrays, enums, nullable/optional fields, nested objects All parameter types: path, query, header, cookie, and combinations Schema composition: allOf (inheritance), oneOf (discriminated unions), anyOf (flexible unions) Security schemes: API key and bearer token authentication Discriminator-based polymorphic deserialization and error handling Provides: Error handling for invalid JSON, type mismatches, missing/unknown discriminator, and parameter validation Build system integration (CMake) for easy compilation and linking with required dependencies Clear build and run instructions for local development and testing Enables comprehensive, real-world validation of generated C++ server code against OpenAPI specifications

rajvesh · 2026-02-12T09:40:15Z

Hello @wing328 ,
Please approve workflows for commit id: 38adb5d

Previous commits can be ignored.
Thank you.

wing328 · 2026-02-12T11:40:44Z

https://github.com/OpenAPITools/openapi-generator/actions/runs/21940448868/job/63378830811?pr=21724

i'll fix that after merging this PR

wing328 · 2026-02-12T11:41:02Z

overall it looks good 👍

thanks for contributing a new generator.

rajvesh · 2026-02-14T13:58:20Z

overall it looks good 👍

thanks for contributing a new generator.

Thank you for your support.

wing328 · 2026-02-15T17:33:54Z

update: merged #22980 with minor code format change.

rajvesh force-pushed the httplib-server-codegen branch 2 times, most recently from 474d239 to 145b0b3 Compare August 18, 2025 10:22

rajvesh force-pushed the httplib-server-codegen branch from 145b0b3 to d220c6e Compare August 23, 2025 22:46

rajvesh force-pushed the httplib-server-codegen branch from 3234b2f to 10f300d Compare August 28, 2025 07:52

rajvesh force-pushed the httplib-server-codegen branch from 10f300d to 5fa32aa Compare February 9, 2026 09:22

wing328 reviewed Feb 9, 2026

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.github/workflows/samples-cpp-httplib-server.yaml Outdated Show resolved Hide resolved

rajvesh force-pushed the httplib-server-codegen branch from 5fa32aa to 7b3234e Compare February 11, 2026 17:27

rajvesh force-pushed the httplib-server-codegen branch 2 times, most recently from 13719d7 to 914e27d Compare February 12, 2026 06:38

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wing328 reviewed Feb 12, 2026

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...napi-generator/src/main/java/org/openapitools/codegen/languages/CppHttplibServerCodegen.java Show resolved Hide resolved

wing328 added Client: C++ Enhancement: New generator labels Feb 12, 2026

wing328 added this to the 7.20.0 milestone Feb 12, 2026

rajvesh commented Feb 12, 2026

View reviewed changes

wing328 added Server: C++ and removed Client: C++ labels Feb 12, 2026

rajvesh force-pushed the httplib-server-codegen branch 2 times, most recently from c692af3 to 588a545 Compare February 12, 2026 08:22

rajvesh force-pushed the httplib-server-codegen branch from 588a545 to 38adb5d Compare February 12, 2026 09:14

wing328 merged commit b96334f into OpenAPITools:master Feb 12, 2026
20 of 21 checks passed

wing328 changed the title ~~Httplib server codegen~~ C++ Httplib server codegen Feb 12, 2026

wing328 mentioned this pull request Feb 15, 2026

Minor improvements to Terraform & C++ Httplib generators #22980

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