fix(java-spring): handle UUID type in enum values generation

[renatomameli]

Problem

When generating Spring enums with format: uuid, the generated code incorrectly uses string literals instead of the proper UUID.fromString(...) method.

This issue came up here: #23516

// Before (broken)
D6A8F2B0_1C34_4E56_A789_0ABCDEF12345("d6a8f2b0-...")

// After (fixed)
D6A8F2B0_1C34_4E56_A789_0ABCDEF12345(UUID.fromString("d6a8f2b0-..."))

Solution

Add UUID handling in AbstractJavaCodegen.toEnumValue() following the existing URI pattern:

} else if ("UUID".equals(datatype)) {
    return "UUID.fromString(\"" + escapeText(value) + "\")";
}

Test

Added contractWithUuidEnumShouldGenerateValidEnum() test that verifies UUID.fromString() is used for enum values

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---

Summary by cubic

Fix enum generation for format: uuid in Java/Spring. Enums now call UUID.fromString(...) and store real UUID values instead of strings.

• Bug Fixes
  • Handle UUID in AbstractJavaCodegen.toEnumValue() by returning UUID.fromString("...").
  • Add test contractWithUuidEnumShouldGenerateValidEnum and sample spec to verify UUID.fromString(...) and a private final UUID value.

^{Written for commit 6cb572a. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 3 files

[renatomameli]

@wing328 result of your comment #23516 (comment)

[wing328]

cc @cachescrubber (2022/02) @welshm (2022/02) @MelleD (2022/02) @atextor (2022/02) @manedev79 (2022/02) @javisst (2022/02) @borsch (2022/02) @banlevente (2022/02) @Zomzog (2022/09) @martin-mfg (2023/08)

[wing328]

I did a test with

 java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -g spring --library spring-boot -i https://raw.githubusercontent.com/renatomameli/openapi-generator/5f83d1672a5a2047c4f2c624ebb64838fbae8693/modules/openapi-generator/src/test/resources/3_0/enum_uuid.yaml -o /tmp/spring2

but the output won't compile.

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.13.0:compile (default-compile) on project openapi-spring: Compilation failure: Compilation failure:
[ERROR] /C:/Users/User/AppData/Local/Temp/spring2/src/main/java/org/openapitools/configuration/EnumConverterConfiguration.java:[20,15] cannot find symbol
[ERROR]   symbol:   class UUID
[ERROR]   location: class org.openapitools.configuration.EnumConverterConfiguration
[ERROR] /C:/Users/User/AppData/Local/Temp/spring2/src/main/java/org/openapitools/api/ResourcesApiController.java:[34,6] cannot find symbol
[ERROR]   symbol:   class Nullable
[ERROR]   location: class org.openapitools.api.ResourcesApiController
[ERROR] /C:/Users/User/AppData/Local/Temp/spring2/src/main/java/org/openapitools/api/ResourcesApiController.java:[38,36] cannot find symbol
[ERROR]   symbol:   class Nullable
[ERROR]   location: class org.openapitools.api.ResourcesApiController
[ERROR] /C:/Users/User/AppData/Local/Temp/spring2/src/main/java/org/openapitools/configuration/EnumConverterConfiguration.java:[21,30] cannot find symbol
[ERROR]   symbol:   class UUID
[ERROR]   location: class org.openapitools.configuration.EnumConverterConfiguration
[ERROR] /C:/Users/User/AppData/Local/Temp/spring2/src/main/java/org/openapitools/configuration/EnumConverterConfiguration.java:[23,44] cannot find symbol
[ERROR]   symbol: class UUID
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.

am I testing this change correctly?

[renatomameli]

java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -g spring --library spring-boot -i https://raw.githubusercontent.com/renatomameli/openapi-generator/5f83d1672a5a2047c4f2c624ebb64838fbae8693/modules/openapi-generator/src/test/resources/3_0/enum_uuid.yaml -o /tmp/spring

For EnumConverterConfiguration I get the same result. But that is fixed by my other "original" PR: #23516 which I mentioned here.

I cannot confirm the errors in ResourcesApiController. I am not sure why Nullable should cause an error out of a sudden there. My output for this class is the following:

package org.openapitools.codegen.languages;

import org.openapitools.model.Resource;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.context.request.NativeWebRequest;

import jakarta.validation.constraints.*;
import jakarta.validation.Valid;

import java.util.List;
import java.util.Map;
import java.util.Optional;
import jakarta.annotation.Generated;

@Generated(value = "org.openapitools.codegen.languages.SpringCodegen", date = "2026-04-20T14:02:03.229211979+02:00[Europe/Vienna]", comments = "Generator version: 7.22.0-SNAPSHOT")
@Controller
@RequestMapping("${openapi.sample.base-path:}")
public class ResourcesApiController implements ResourcesApi {

    private final NativeWebRequest request;

    @Autowired
    public ResourcesApiController(NativeWebRequest request) {
        this.request = request;
    }

    @Override
    public Optional<NativeWebRequest> getRequest() {
        return Optional.ofNullable(request);
    }

}

[wing328]

cc @cachescrubber (2022/02) @welshm (2022/02) @MelleD (2022/02) @atextor (2022/02) @manedev79 (2022/02) @javisst (2022/02) @borsch (2022/02) @banlevente (2022/02) @Zomzog (2022/09) @martin-mfg (2023/08)

[jpfinne]

@renatomameli @wing328 The compilation error for class Nullable will be fixed when #23576 is merged.

I've introduced a regression with the introduction of jspecify, sorry for the inconvenience .

The missing UUID import is due to modules/openapi-generator/src/main/resources/JavaSpring/converter.mustache

It does not import UUID, URI, BigDecimal... It makes sense to add them as well.

Either you unconditionally import them in the template, either you add them programmatically in additionalProperties

{{#enumConverter.imports}}import {{import}};
{{/enumConverter.imports}}

[renatomameli]

@renatomameli @wing328 The compilation error for class Nullable will be fixed when #23576 is merged.

I've introduced a regression with the introduction of jspecify, sorry for the inconvenience .

The missing UUID import is due to modules/openapi-generator/src/main/resources/JavaSpring/converter.mustache

It does not import UUID, URI, BigDecimal... It makes sense to add them as well.

Either you unconditionally import them in the template, either you add them programmatically in additionalProperties

{{#enumConverter.imports}}import {{import}};
{{/enumConverter.imports}}

Yes the missing imports are fixed here: #23516

[wing328]

For EnumConverterConfiguration I get the same result. But that is fixed by my other "original" PR: #23516 which I mentioned here.

confirmed the output compiles without issues when tested with both PRs merged into master.

[wing328]

FYI. samples updated via bf51147