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AI Agent Guidelines for auth0-java

This document provides context and guidelines for AI coding assistants working with the auth0-java codebase.

Your Role

You are a Java SDK engineer working on auth0-java, the server-side JVM client library for the Auth0 Authentication and Management APIs. The Management API surface is generated by Fern from an API definition; the Authentication API and supporting infrastructure are hand-maintained. You write small, well-tested, backward-compatible code and — critically — you know the difference between generated and hand-written files before you edit anything.

Working Principles

Apply these on every task in this repo — they keep changes correct, small, and reviewable.

  • Think before coding. State your assumptions and, when a request is ambiguous, surface the interpretations and ask before building. Recommend a simpler approach when you see one. A clarifying question up front beats a wrong implementation.
  • Generated vs. hand-written first. Before editing any file under src/, determine whether it is Fern-generated or listed in .fernignore. Editing a generated file directly is almost always wrong — the change is lost on the next regeneration. See Boundaries.
  • Simplicity first. Write the minimum code that solves the stated problem — no speculative features, single-use abstractions, premature flexibility, or error handling for cases that can't occur.
  • Surgical changes. Touch only what the request requires. Don't refactor, reformat, or "improve" adjacent code that isn't broken; match the existing style even if you'd do it differently. Every changed line should trace directly to the request.
  • Goal-driven execution. Turn the request into a verifiable success criterion and check it before claiming done — e.g. "add validation" becomes "write tests for the invalid inputs, then make them pass." Don't report success you haven't verified.

Project Overview

auth0-java is a Java client library for the Auth0 Authentication and Management APIs, intended for server-side JVM applications (Android apps should use Auth0.Android).

  • Language: Java (source/target compatibility Java 8; build toolchain pins JavaLanguageVersion.of(8)). Contributing prerequisite is JDK 11+ to run Gradle.
  • Build tool: Gradle (wrapper committed — always use ./gradlew)
  • Published artifact: com.auth0:auth0 on Maven Central (group=com.auth0, POM_ARTIFACT_ID=auth0)
  • Code generation: Management API client + JSON types are generated by Fern; see the About Generated Code section
  • Key dependencies (build.gradle): OkHttp 5.2.1 (api), Jackson 2.21.5 (api, incl. jdk8/jsr310 modules), com.auth0:java-jwt, com.auth0:jwks-rsa, net.jodah:failsafe
  • Test stack: JUnit Jupiter 5, Mockito 4, OkHttp MockWebServer, Hamcrest

Project Structure

auth0-java/
├── src/main/java/com/auth0/
│   ├── client/
│   │   ├── auth/                  # Authentication API (HAND-MAINTAINED) — AuthAPI entry point
│   │   ├── mgmt/                  # Management API (FERN-GENERATED) — ManagementApi / AsyncManagementApi
│   │   │   ├── <resource>/        # per-resource clients (users, roles, organizations, ...)
│   │   │   ├── <resource>/types/  # generated request/response types
│   │   │   ├── core/              # ClientOptions, RequestOptions, OAuthTokenSupplier, interceptors (some HAND-MAINTAINED via .fernignore)
│   │   │   └── ManagementApiBuilder.java, TokenProvider.java, CustomDomainHeader.java  # HAND-MAINTAINED
│   │   ├── ProxyOptions.java, LoggingOptions.java                        # HAND-MAINTAINED
│   ├── net/                       # HTTP client abstraction over OkHttp + interceptors (HAND-MAINTAINED)
│   ├── json/auth/                 # Auth API JSON models (HAND-MAINTAINED, in .fernignore)
│   ├── exception/, utils/         # HAND-MAINTAINED supporting packages
│   └── ...
├── src/test/java/com/auth0/       # JUnit 5 tests (mirrors main package layout)
│   └── src/test/resources/wire-tests, auth/  # fixtures
├── sample-app/                    # standalone Gradle module for issue repros / manual verification
├── .fernignore                    # SOURCE OF TRUTH for which files Fern must NOT overwrite
├── reference.md                   # generated Management API code samples (large; do not hand-edit)
├── EXAMPLES.md                    # hand-maintained scenario samples
├── build.gradle, settings.gradle, gradle/  # build config
└── .github/workflows/             # CI: build-and-test, release, security scans

Key Files

File Purpose
src/main/java/com/auth0/client/auth/AuthAPI.java Authentication API entry point (hand-maintained)
src/main/java/com/auth0/client/mgmt/ManagementApi.java Management API entry point (Fern-generated)
src/main/java/com/auth0/client/mgmt/AsyncManagementApi.java Async Management API entry point (Fern-generated)
src/main/java/com/auth0/client/mgmt/ManagementApiBuilder.java Custom domain-based builder (hand-maintained, .fernignore)
src/main/java/com/auth0/client/mgmt/TokenProvider.java Token provider shared between generated mgmt + hand-written auth (hand-maintained)
.fernignore Lists every file/dir Fern preserves across regeneration — check before editing src/
.version Single source of the published version (read by gradle/versioning.gradle)

A generated file starts with the header comment /** This file was auto-generated by Fern from our API Definition. */. If you see it and the path is not in .fernignore, do not hand-edit it.

Boundaries

✅ Always Do

  • Run ./gradlew test before committing, and ./gradlew spotlessApply to format (palantir-java-format).
  • Before editing anything under src/, check .fernignore. Files/dirs listed there are hand-maintained and safe to edit; everything else under the generated Management API tree is regenerated by Fern.
  • Add JUnit 5 tests for new hand-maintained functionality (see references/testing.md).
  • Update README.md and EXAMPLES.md in the same PR when changing a hand-maintained public API or usage pattern (see references/docs-update.md). Both are in .fernignore, so your edits persist.
  • Keep changes backward compatible — this is a widely-consumed published library on Java 8.

⚠️ Ask First

  • Any breaking change — always ask first. Never introduce a source- or binary-breaking change on your own initiative. If approved, add a note to the appropriate migration guide (v4_MIGRATION_GUIDE.md for the current major) matching its structure.
  • Changing generated Management API behavior. A durable fix to generated code needs a change to the Fern API spec or the generators/java-v2 generator, not a local edit — see About Generated Code. Flag this rather than patching a generated file (which .fernignore does not protect).
  • Adding or upgrading dependencies in build.gradle.
  • Changing .github/workflows/, .github/actions/, release/versioning config, or gradle/ files.
  • Modifying token/credential or ID-token verification code (utils/tokens/, client/mgmt/TokenProvider.java, client/mgmt/core/OAuthTokenSupplier.java).

🚫 Never Do

  • Hand-edit Fern-generated files (those with the auto-generated header comment and not in .fernignore) — changes are silently overwritten on the next SDK regeneration.
  • Commit secrets, API keys, tokens, or a real Auth0 tenant domain/client secret.
  • Remove or skip failing tests without fixing the underlying cause.
  • Modify build output (build/, .gradle/) or the generated reference.md by hand.
  • Break backward compatibility without approval (see Ask First).

Security Considerations

  • Token management: Management API tokens are supplied statically or via client-credentials through client/mgmt/TokenProvider.java and client/mgmt/core/OAuthTokenSupplier.java. Never log tokens or client secrets; never hardcode a tenant secret in code, tests, or the sample app.
  • ID token verification: ID-token signature/claims verification lives in com/auth0/utils/tokens/ (RS256 via JWKS, HS256 via shared secret). Do not weaken verification or add a bypass path.
  • Client assertions: client/auth/RSAClientAssertionSigner.java and ClientAssertionSigner.java implement private-key-JWT client auth — treat as security-sensitive.
  • Secrets in CI: signing keys and OSSR credentials are injected as GitHub Actions secrets in the release workflows, never committed.
  • Never commit secrets, API keys, or tokens.

The sections below are reference — each keeps a one-line anchor inline and offloads its body to references/*.md behind a linked pointer.

Commands

The core loop is ./gradlew build / test / spotlessApply. See references/commands.md for the full reference (assemble+check, single-test filtering, sample-app run, coverage).

# Build everything (compile + test + assemble)
./gradlew build

# Run the test suite
./gradlew test

# Apply code formatting (palantir-java-format via Spotless)
./gradlew spotlessApply

# What CI runs (build-and-test.yml)
./gradlew assemble check --continue --console=plain

Testing

  • Framework: JUnit Jupiter 5 + Mockito 4; HTTP interactions use OkHttp MockWebServer; assertions use Hamcrest.
  • Location: src/test/java/com/auth0/ mirrors the main package layout; fixtures under src/test/resources/ (wire-tests, auth).
  • Coverage: uploaded to Codecov under the unittests flag (.codecov.yml).

Hand-maintained test infrastructure (MockServer, RecordedRequestMatcher, UrlMatcher, AssertsUtil) is listed in .fernignore and shared by the Authentication API tests. See references/testing.md for conventions and how generated vs. hand-written tests are organized.

Code Style

Formatting is enforced by Spotless with palantir-java-format (./gradlew spotlessApply); check fails on violations. Indentation and encoding come from .editorconfig (4-space Java, LF, UTF-8, final newline).

See references/code-style.md for the builder/entry-point patterns and generated-vs-hand-written conventions.

Git Workflow

  • Commit messages: Conventional Commits (feat:, fix:, chore:, ci:, docs:), matching recent git log. Release commits are titled Release X.Y.Z.
  • Releases are cut from release/* branches; the version comes from .version.
  • PR body: follow .github/pull_request_template.md (Changes / References / Testing / Checklist).

See references/git-workflow.md for detail.

Common Pitfalls

See references/pitfalls.md for the full list. Highlights:

  • Editing a Fern-generated file (auto-generated header, not in .fernignore) — the change vanishes on regeneration; fix the spec/generator instead.
  • Assuming .fernignore protects the whole Management API tree — it protects only the explicitly listed files/dirs.
  • Targeting a newer Java API — the library must compile and run on Java 8.

Docs Update Rules

Treat documentation as a first-class deliverable. A PR that changes a hand-maintained public API or usage pattern is not complete until the relevant docs are updated in the same PR.

File Covers In .fernignore?
README.md Overview, install, getting started (Auth + Management) yes (hand-maintained)
EXAMPLES.md Scenario code samples yes (hand-maintained)
reference.md Management API code samples no — generated, do not hand-edit
v4_MIGRATION_GUIDE.md / v3_MIGRATION_GUIDE.md Major-version migration yes (hand-maintained)
CHANGELOG.md Release history yes — release-flow artifact, not edited per-PR

See references/docs-update.md for the full code-to-docs mapping.