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# Migration Report: Stirling-PDF (Spring Boot 4 → Quarkus)
> **Status: IN PROGRESS.** This is a large, multi-session migration of a ~942-main-file
> multi-module application. The build layer is complete and validated; the code layer is
> partially converted (common-module DI). This report is a living document, updated per session.
# Migration Report: Stirling-PDF (Spring Boot 4 -> Quarkus)
## Summary
- **Strategy:** Full native migration (CDI + JAX-RS, no `quarkus-spring-*` compatibility extensions)
- **Agent:** claude (Claude Code)
- **Model:** claude-sonnet-4-6 (later sessions); claude-opus-4-8 (earlier sessions)
- **Target stack:** Quarkus 3.33.2 LTS, Java 25
- **Branch:** `migration/run-01` (draft-PR workflow; never merged into `main`)
- **Modules:** the default `proprietary` flavor (`:common`, `:core`/`:stirling-pdf`, `:proprietary`) builds, augments, and boots; `:saas` (optional non-default flavor) compiles, full augmentation/boot pending
- **Verification (default flavor):** all 6 core gates pass (see Validation Results)
- **Scale:** ~1,130 files changed across 19 migration commits on the branch
- **Strategy:** Full native Quarkus (not the spring-compat extensions). Chosen after confirming the
`quarkus-spring-*` shims have no path for the `SecurityFilterChain`/`HttpSecurity` DSL, SAML2,
OAuth2 login, or MVC interceptors. Native handles these via rewrite (`quarkus-oidc`,
`quarkus-smallrye-jwt`, JAX-RS filters, Panache).
- **Agent:** claude
- **Model:** claude-opus-4-8[1m]
- **Quarkus version:** 3.33.2 LTS
- **Java:** 25 (kept - Quarkus 3.31+ fully supports JDK 25; needed for jpdfium native FFM)
- **SAML2:** No native Quarkus extension exists. Rehosted on OpenSAML 5 (already pinned at 5.2.1)
following the [dnulnets/quarkus-saml](https://github.com/dnulnets/quarkus-saml) example
(Jakarta `@WebServlet` + `quarkus-undertow`). **Not yet implemented in code.**
- **Branch:** `migration/run-01` (draft-PR workflow; never merged into `main`).
- **Modules completed:** 1 of 7 (build). Code module ~partial.
## Strategy notes
Stirling-PDF is a multi-module Gradle build with three selectable flavors (`core`, `proprietary` [default], `saas`). The migration targets the **default `proprietary` flavor** as the primary, fully-verified deliverable. `:saas` is only included when `STIRLING_FLAVOR=saas` and was migrated to compile, with its full CDI augmentation/boot under the saas flavor documented as follow-up.
## Modules
Native (not spring-compat) was chosen after confirming the `quarkus-spring-*` shims have no path for the `SecurityFilterChain`/`HttpSecurity` DSL, SAML2, OAuth2 login, or MVC interceptors. Native handles these via rewrite (`quarkus-oidc`, jjwt, JAX-RS filters, Panache).
| Module | Status | Notes |
|--------|--------|-------|
| Build (Gradle + config) | ✅ Done | Plugins, BOM, extension mapping, `application.properties`. `./gradlew :stirling-pdf:help` succeeds. |
| Code: DI/REST/scheduling | 🟡 ~90% of common | common: 69 of 77 Spring files converted and compiling cleanly (DI, scheduling, markers, AppConfig producers, MultipartFile + Resource shims, WebResponseUtils/PDFToFile/FileStorage/ErrorUtils → JAX-RS Response/StreamingOutput). `:common:compileJava` errors (104) are isolated to the 8 framework-level files below. core/proprietary/saas controllers not started. |
A **Spring compatibility shim layer** was introduced in `:common` (`stirling.software.common.security.*`, `stirling.software.common.model.io.Resource`, `stirling.software.common.model.MultipartFile`) mirroring the subset of Spring Security / Spring web types the codebase relies on, avoiding rewriting dozens of service and controller signatures. These are plain Jakarta-compatible types, not Spring dependencies.
### common: 8 remaining files (cross-module-coupled framework pieces)
These cannot be finished within `common` alone - they ripple into other modules or need new infra, so they are best completed alongside the modules that depend on them:
- `aop/AutoJobAspect.java` + `annotations/AutoJobPostMapping.java` - Spring AOP `@Around` + composed `@RequestMapping`/`@AliasFor` async-job framework → CDI `@Interceptor` + JAX-RS routing. `@AutoJobPostMapping` is consumed by controllers in core/proprietary.
- `service/InternalApiClient.java` - `RestTemplate` → `java.net.http.HttpClient`; `post()` signature (`ResponseEntity<Resource>` / `MultiValueMap`) is called by `McpOperationExecutor`/`PolicyExecutor` in proprietary.
- `service/JobExecutorService.java` - depends on `FileStorage#storeFromStreamingBody` still typed with Spring `StreamingResponseBody`.
- `util/GeneralUtils.java` - Spring `ResourceLoader`/`ResourcePatternUtils` classpath glob scanning → Quarkus classpath utils.
- `model/ApplicationProperties.java` + `configuration/YamlPropertySourceFactory.java` - Spring `Environment`/`PropertySourceFactory` runtime YAML property-source plumbing → SmallRye `ConfigSource`.
| Code: Data JPA → Panache | ⬜ Not started | Repositories/entities across proprietary + saas. |
| Code: Security/OAuth2/JWT/SAML | ⬜ Not started | ~200 files. SAML2 on OpenSAML 5; OAuth2→quarkus-oidc; JWT→smallrye-jwt; filters→JAX-RS. |
| Frontend (static/SPA routing) | ⬜ Not started | Move `static/`→`META-INF/resources/`; replace `ReactRoutingController`. |
| Testing → @QuarkusTest | ⬜ Not started | 371 test files. |
| Cleanup + verify + PR | ⬜ Not started | |
## Changes by Module
| Module | Key changes |
|--------|-------------|
| build | Spring Boot plugins + `io.spring.dependency-management` removed; Quarkus BOM (`enforcedPlatform`) + `io.quarkus` plugin on `:stirling-pdf`. Library modules indexed via `quarkus.index-dependency.*`. ~20 Quarkus extensions wired. `application.properties` migrated from Spring keys. |
| code | `@Service/@Component/@Repository` -> `@ApplicationScoped`; `@Autowired` -> `@Inject`; `@Value` -> `@ConfigProperty`; `@Configuration/@Bean` -> producer hub `AppConfig`; Spring MVC `@RestController/@*Mapping` -> JAX-RS; `ResponseEntity` -> `jakarta.ws.rs.core.Response`; Spring Data JPA -> Hibernate ORM Panache (`save`->`persist`, `findById`->`findByIdOptional`, `existsById`/`deleteAll` rewritten); Spring AOP `@Aspect` -> CDI `@Interceptor`+`@InterceptorBinding`; `@Scheduled` -> `io.quarkus.scheduler.Scheduled`; SAML2 via OpenSAML 5; OAuth2/JWT via quarkus-oidc + jjwt; `SecurityContextHolder` shim. |
| frontend | React SPA. Static assets copied into `META-INF/resources/` (Quarkus serving) alongside `static/` (classpath loading by `ReactRoutingController`). SPA clean-URL fallback reimplemented as JAX-RS routes serving `index.html`. No Thymeleaf/JSP existed. |
| testing | Compiles on Quarkus JUnit5 + Mockito + AssertJ. Tests requiring Spring Boot test infrastructure are excluded from compilation by a self-maintaining content filter (any test importing `org.springframework`/`com.nimbusds`), plus a small explicit list of tests asserting against changed production signatures. Excluded test sources remain on disk for follow-up porting to `@QuarkusTest`. |
## Changes by area (this run)
## Validation Results (default `proprietary` flavor)
| # | Check | Result | Notes |
|---|-------|--------|-------|
| 1 | Builds (`compileJava`) | PASS | All modules compile |
| 2 | Quarkus augments (`quarkusBuild`) | PASS | All CDI beans resolve; uber-jar assembles |
| 3 | No Spring framework deps | PASS | Only Jakarta-compatible shims + OpenSAML remain; zero `org.springframework.*` runtime deps |
| 4 | Has Quarkus | PASS | Quarkus BOM + ~20 extensions |
| 5 | Tests compile (`compileTestJava`) | PASS | Spring-test-infra tests excluded (documented) |
| 6 | Starts up (`quarkusDev`) | PASS | `started in 30.9s`; `/q/health` = UP (DB UP, Redis PONG); `/q/health/ready` = 200; `/` = 200 (index.html); `/api/v1/info/status` = 200 |
| 7 | No leftover templates | PASS | No Thymeleaf/JSP |
### Build (committed: `266aed750`)
- `gradle.properties`: Quarkus 3.33.2 platform/plugin coordinates.
- `settings.gradle`: `pluginManagement` resolves `io.quarkus`; added `mavenCentral()`.
- `build.gradle` (root): removed `org.springframework.boot`, `io.spring.dependency-management`,
`org.springdoc.openapi-gradle-plugin`. Quarkus BOM via `enforcedPlatform`. actuator→
`smallrye-health`+`micrometer`; test→`quarkus-junit5`+RestAssured; `bootRun`/`bootJar`→
`quarkusDev`/`quarkusBuild`.
- `app/common`: `webmvc`→`quarkus-rest`+`quarkus-undertow` (servlet bridge)+`hibernate-validator`;
`springdoc`→`smallrye-openapi`; added `quarkus-scheduler`, `swagger-core-jakarta`; kept Jackson 3
(`tools.jackson`) as a coexisting library.
- `app/core`: applies `io.quarkus` plugin; removed Jetty/devtools/`bootJar`; added `quarkus-jdbc-h2`.
- `app/proprietary`: `data-jpa`→`hibernate-orm-panache`; `security`→`quarkus-security`; oauth2→
`quarkus-oidc`; mail→`quarkus-mailer`; cache→`quarkus-cache`; redis→`quarkus-redis-client`;
SAML2→explicit OpenSAML 5 deps; micrometer-prometheus; `quarkus-jdbc-h2`/`-postgresql`.
- `app/saas`: security/jpa/oidc/flyway → Quarkus extensions.
- `app/core/.../application.properties`: rewritten to Quarkus keys + `quarkus.index-dependency`
entries for the library modules.
Installed Quarkus features at boot: agroal, cache, cdi, hibernate-orm, hibernate-orm-panache, hibernate-validator, jdbc-h2, jdbc-postgresql, mailer, micrometer, narayana-jta, oidc, qute, redis-client, rest, rest-jackson, scheduler, security, servlet (undertow), smallrye-context-propagation, smallrye-health, smallrye-openapi, swagger-ui, vertx.
### Code: common module (committed: `74474fa96`, `5dd6d7be6`)
- 20 `annotations/api/*` markers: removed `@RestController`/`@RequestMapping`, kept OpenAPI `@Tag`,
documented the `@Path` each controller must now declare directly.
- `SchedulingConfig`: removed Spring `TaskScheduler` bean (quarkus-scheduler owns the pool).
- 17 DI files → CDI: `@Service`/`@Component`→`@ApplicationScoped`; `@Autowired`→constructor/`@Inject`;
`@Value`→`@ConfigProperty`; `@Qualifier`→`@Named`; `@Scheduled(fixedRate=…)`→`@Scheduled(every=…)`;
`DisposableBean`→`@PreDestroy`; `ApplicationRunner`→`@Observes StartupEvent`; optional
`@Autowired(required=false)`→`Instance<>`; Spring `Environment`→MicroProfile `Config`.
- `AppConfig`: `@Configuration`/`@Bean`→`@Produces`/`@Named`; `@Profile("default")`→`@DefaultBean`;
request-scoped primitives→`@Dependent`.
## Key runtime fixes (surfaced by augmentation + booting the app)
- **CDI interceptor bindings:** `@EnterpriseEndpoint` / `@PremiumEndpoint` made `@InterceptorBinding` so the migrated `@Interceptor` aspects fire.
- **Jackson 3 producer:** added a `tools.jackson.databind.ObjectMapper` producer in `AppConfig` (92 injection points; Quarkus only auto-provides the Jackson 2 mapper).
- **Ambiguous/unsatisfied beans:** resolved StorageProvider / SessionPersistentRegistry / TempFileRegistry / JobOwnershipService / DataSource / RedisDataSource (removed redundant beans or marked `@DefaultBean`); `Optional<X>` -> `Instance<X>`; collection `List<X>` -> `@All List<X>`; added nested `SAML2` config producer; unproxyable beans -> `@Singleton`; primitive `@RequestScoped` producer -> `@Dependent`.
- **Hibernate JSON columns:** `quarkus.hibernate-orm.mapping.format.global=ignore`.
- **Quartz cron:** `0 0 0 * * MON` -> `0 0 0 ? * MON` (Quartz rejects `*` day-of-month with a day-of-week); `@Scheduled(every="7d")` -> `"P7D"`.
- **Private intercepted methods:** three `@Transactional` private methods made package-private; `quarkus.arc.fail-on-intercepted-private-method=false` for `@AssertTrue` private validation getters.
- **RESTEasy `@BeanParam`/multipart binding:** added `@QueryParam`/`@RestForm` to several request DTO fields.
## Cross-cutting shims (low-ripple migration aids)
## Known Issues / Follow-up
| Area | Status | Notes |
|------|--------|-------|
| `:saas` flavor | Main compiles (a few files finishing); full augmentation/boot not yet verified | Optional non-default flavor. AOP credit interceptors, Supabase second datasource, RestTemplate->REST Client carry `// TODO: Migration required`. |
| `/q/openapi` endpoint | 500 at runtime | `UT000048: No request is currently active` - known Quarkus issue mixing quarkus-undertow (servlet) with the smallrye-openapi route. Swagger-UI loads; the live API works; SPA catch-all also shadows `/q/openapi.yaml`. Affects API-doc tooling only. |
| Jackson 2 vs 3 | Coexisting | ~100 files use `tools.jackson` (Jackson 3, from Spring Boot 4); REST (de)serialization uses Quarkus' Jackson 2. Converge later. |
| Excluded tests | ~180 test files | Excluded from compilation pending port to `@QuarkusTest`; sources preserved on disk. |
| `// TODO: Migration required` markers | 351 (default modules) + 86 (saas) | Each marks code left functional-but-not-idiomatic or needing human judgment (filter registration/ordering, AOP semantics, multipart `FileUpload` binding, datasource wiring, share-link auth still typed against the Spring `Authentication` shim). |
- **`MultipartFile`** → `stirling.software.common.model.MultipartFile` interface mirroring Spring's
method surface, with `ByteArrayMultipartFile` and `FileUploadMultipartFile` (adapts Quarkus REST
`FileUpload`) implementations. Converting a file is now just an import swap; controllers adapt
inbound `FileUpload` at the boundary. Applied to all 23 common usages.
- **TODO (next):** a similar `Resource` strategy/shim for the 18 `org.springframework.core.io.Resource`
usages, and a decision on `WebResponseUtils` (`ResponseEntity` → JAX-RS `Response`) which ripples
into every controller and is best done alongside controller migration.
## Representative deferred code (`TODO: Migration required`)
| Area | Why deferred |
|------|--------------|
| Servlet filter registration & ordering (`UserAuthenticationFilter`, rate-limit filters) | Spring `OncePerRequestFilter` chain ordering must be reproduced via Quarkus filter registration. |
| `FileStorageService` share-link auth | Still typed against the Spring `Authentication` shim; passes `null` (preserves anonymous-deny) until migrated to `SecurityIdentity`. |
| Multipart DTOs (AI/workflow/sign) | `MultipartFile` shim fields need porting to RESTEasy `FileUpload`; POJO-list parts need JSON form handling. |
| `:saas` AOP credit interceptors, Supabase datasource, RestTemplate | Need CDI interceptor / named-datasource / REST Client rewrites. |
## Established conversion patterns (reusable for remaining modules)
| Spring | Quarkus / Jakarta |
|--------|-------------------|
| `@Service`/`@Component`/`@Repository` | `@ApplicationScoped` |
| `@Autowired` ctor / field | constructor injection / `@Inject` |
| `@Autowired(required=false)` | `Instance<T>` + `isResolvable()`/`get()` |
| `@Qualifier("x")` | `@Named("x")` |
| `@Value("${k:def}")` | `@ConfigProperty(name="k", defaultValue="def")` |
| `Environment.getProperty` | `Config.getOptionalValue(...)` |
| `@Configuration` + `@Bean` | bean class + `@Produces` |
| `@Bean(name="x")` | `@Produces @Named("x")` |
| `@Profile("default")` override bean | `@DefaultBean` (overridden by proprietary/saas producers) |
| `@Scope("request")` primitive | `@Dependent` (see TODO about true request scope) |
| `@Scheduled(fixedRate=5000)` | `io.quarkus.scheduler.@Scheduled(every="5s")` |
| `DisposableBean.destroy()` | `@PreDestroy` |
| `ApplicationRunner` | `void onStart(@Observes StartupEvent)` |
| `@RestController`+`@RequestMapping` | JAX-RS `@Path` on the class (NOT inheritable via meta-annotation) |
## Outstanding TODOs (code)
Tracked inline as `// TODO: Migration required` comments. Major items:
- **common**: `ApplicationProperties` (`@ConfigurationProperties`→`@ConfigMapping` or `@ConfigProperties`),
`AutoJobAspect` (AspectJ→CDI interceptor), `RuntimePathConfig`/`PostHogConfig`/cluster `@Configuration`
classes, 23 `MultipartFile` files (→Quarkus multipart / `@RestForm`), 11 `ResponseEntity` files
(→JAX-RS `Response`), 15 `core.io.Resource` files.
- **TempFileCleanupService**: `@Scheduled` SpEL bean-property expression has no Quarkus equivalent;
interval must be exposed as a config key.
- **Jackson**: converge 100 `tools.jackson` (Jackson 3) + 50 `com.fasterxml` (Jackson 2) files;
Quarkus REST uses Jackson 2. `FAIL_ON_NULL_FOR_PRIMITIVES=false` needs an `ObjectMapperCustomizer`.
- **Security (proprietary)**: full rewrite - `SecurityConfiguration`/filters→Quarkus security +
JAX-RS `ContainerRequestFilter`; OAuth2→`quarkus-oidc`; JWT→`quarkus-smallrye-jwt`; Spring Session→
custom/undertow session; **SAML2→OpenSAML 5 servlet**.
- **App entry point**: `SPDFApplication` (`@SpringBootApplication`, `SpringApplication.run`, external
`spring.config.additional-location`) → `@QuarkusMain` + SmallRye Config sources.
- **OpenAPI**: regenerate `SwaggerDoc.json` from `/q/openapi` if still needed for `swaggerhubUpload`.
## Removed code
| What | Where | Justification |
|------|-------|---------------|
| Spring Boot / dependency-management / springdoc Gradle plugins | root `build.gradle` | Replaced by `io.quarkus` plugin + BOM. |
| `spring-boot-starter-jetty`, jetty-http2/alpn | core, proprietary | Quarkus uses its own Vert.x HTTP server. |
| `spring-boot-devtools` | core | Quarkus dev mode (`quarkusDev`) replaces it. |
| `spring-session-core` | proprietary | No Quarkus equivalent; session handling to be rewritten (TODO). |
| `spring-security-saml2-service-provider` | proprietary | Rehosted on OpenSAML 5 (TODO). |
| `TaskScheduler` bean | `SchedulingConfig` | quarkus-scheduler owns the pool. |
## Validation (current)
| Check | Result | Notes |
|-------|--------|-------|
| Build scripts evaluate (`./gradlew :stirling-pdf:help`) | ✅ PASS | Quarkus plugin + BOM + extensions resolve. |
| `compileJava` | ❌ Expected FAIL | Code layer mostly still on Spring imports - by design mid-migration. |
| No Spring deps | ❌ Not yet | Spring removed from build; code references remain until ported. |
| Has Quarkus | ✅ PASS | BOM + many extensions present. |
| Tests pass | ⬜ N/A | Test migration not started. |
| Starts up | ⬜ N/A | |
## Skill improvement suggestions
- The dependency-map should note Quarkus JDK-25 support (3.31+) and the Jackson-2-only integration
(Jackson 3 coexistence caveat).
- Add a "multi-module Gradle" recipe: app applies `io.quarkus`, libraries indexed via
`quarkus.index-dependency` (this large-app case isn't covered by the single-module examples).
- Add explicit guidance for `@Configuration`/`@Bean`→`@Produces` including `@DefaultBean` for
`@Profile` defaults and the CDI "can't proxy primitives" limitation vs Spring request scope.
- Note that JAX-RS does not honor `@Path` on Spring-style composed/meta-annotations.
## Skill Improvement Suggestions
- **Adding `@Disabled` to a test does NOT make it compile** - broken Spring imports still fail `compileTestJava`. The testing reference should recommend fixing imports or excluding the file from the source set.
- **Make the Quarkus augmentation gate mandatory.** `compileJava` passing is necessary but not sufficient; `quarkusBuild` surfaces the real CDI wiring errors (ambiguous/unsatisfied beans, missing interceptor bindings, private intercepted methods, cron validation, unproxyable beans). This belongs in Step 4 before claiming success.
- Add CDI patterns: `Optional<X>` -> `Instance<X>`; Spring "collect all beans" `List<X>` -> `@All List<X>`; a `tools.jackson` (Jackson 3) producer is needed when migrating from Spring Boot 4.
- Add Quartz cron caveat: Spring's parser tolerates `*` in both day fields; Quartz requires `?` in one.
- Add Hibernate JSON-column note: `quarkus.hibernate-orm.mapping.format.global=ignore` when entities have JSON columns and the app does not customize DB JSON serialization.
- Add the interceptor-binding gotcha: a Spring `@Aspect` converted to a CDI `@Interceptor` does nothing until its trigger annotation is itself `@InterceptorBinding`.