# Upgrade a Quarkus Dependency and Fix Breakage with Atlas in 2026

> Atlas streamlines the complex task of upgrading major dependencies in Quarkus, automatically fixing compile and test failures by interacting directly with `Maven` and `JUnit 5 (@QuarkusTest)`.

Atlas empowers Quarkus developers in 2026 to efficiently upgrade major dependencies and resolve all resulting compile and test failures by driving your existing toolchain, including `Maven` for package management, `JUnit 5 (@QuarkusTest)` for testing, and `Spotless` for code formatting. It automates the process from dependency bump to code repair and commit, ensuring your Quarkus application remains robust.

## Key takeaways

- Atlas drives `Maven` directly for Quarkus dependency upgrades, using real commands.
- Atlas uses `webfetch` to access critical release notes, informing precise code fixes.
- Atlas leverages `lsp` to navigate new API signatures, ensuring accurate code adjustments in Quarkus.
- All code changes are presented as unified diffs for explicit developer approval before writing.
- Atlas integrates with `Spotless` to maintain code formatting standards in Quarkus projects.
- Atlas ensures `JUnit 5 (@QuarkusTest)` suites are fully functional after dependency migrations.

## How Atlas upgrades Quarkus dependencies and fixes breakage

Atlas streamlines the process of upgrading a major dependency in your Quarkus project in 2026, addressing all compile and test failures by directly interacting with your `Maven` build system. It uses a multi-stage approach to ensure a robust and verifiable migration.

When you instruct Atlas to upgrade a dependency in a Quarkus project, it begins by executing `Maven` commands via `bash` to perform the upgrade. This initial step captures the full output, which Atlas can save to a file if it exceeds typical terminal limits, ensuring no information is lost. Following the upgrade, Atlas uses `webfetch` to retrieve the library's release notes and changelog. This crucial step provides context for breaking changes, allowing Atlas to understand the necessary code modifications rather than guessing. Atlas then drives your Quarkus build process by running `./mvnw clean install` through `bash`, letting the compiler enumerate all new errors. For each error, Atlas employs its `edit` tool, leveraging `lsp`'s `goToDefinition` operation to inspect the new signatures and API changes within the upgraded package. This precise approach ensures that fixes align with the actual breaking changes, respecting Quarkus's build-time augmentation and native-image constraints. The cycle of building, fixing, and re-testing continues until the project compiles and all `JUnit 5 (@QuarkusTest)` tests pass cleanly.

## Concrete commands and files for Quarkus dependency upgrades

Atlas interacts with your Quarkus project using the same concrete commands and configuration files you use daily, ensuring familiarity and control over the upgrade process in 2026. It directly manipulates your `pom.xml` and executes standard `Maven` lifecycle goals.

To initiate a dependency upgrade, Atlas will execute a `Maven` command such as `./mvnw versions:use-latest-versions` or a specific version bump command, directly modifying your project's `pom.xml` file. This is the first step in introducing the new major version of the library. After the `pom.xml` is updated, Atlas runs `./mvnw clean install` via `bash` to trigger a full Quarkus build. This command compiles your application and runs any annotation processors, revealing compile-time errors that need addressing. For test failures, Atlas executes `./mvnw test`, which runs your `JUnit 5 (@QuarkusTest)` suite. Atlas reads the output of these commands to identify specific errors and test failures. When fixing code, Atlas understands Quarkus idioms, such as how CDI beans are declared or how JAX-RS resources are configured. It can also inspect and modify `application.properties` if the upgraded library introduces new configuration requirements. Before committing any changes, Atlas can apply your project's `Spotless` formatting rules by running `./mvnw spotless:apply`, ensuring code consistency and adherence to your team's standards.

## Review and safety for Quarkus dependency migrations with Atlas

Atlas prioritizes safety and developer control throughout the dependency migration process, offering multiple layers of review and approval for every change made to your Quarkus codebase in 2026. Every tool call is permission-gated, and all edits are presented for your explicit approval.

Atlas operates with a robust permission system, where every tool call, including `bash` commands, `webfetch` requests, and `edit` operations, is permission-gated against `allow`, `ask`, and `deny` rules. This means you retain full control over what actions Atlas takes on your Quarkus project. Before making any modifications, Atlas drafts a plan in a read-only plan agent and asks for your approval before switching to a build agent that can execute changes. As Atlas fixes compile and test failures, it computes a unified diff for every file edit. These diffs are surfaced for your approval before any changes are written to disk. This allows you to review each modification, ensuring it aligns with your understanding of the required fixes and respects Quarkus-specific patterns, such as build-time friendly code for native-image compatibility. Atlas also reads `git` branches, status, and diffs, and can stage and create commits on your behalf, but only after you have reviewed and approved the entire set of changes. It snapshots file changes as `git` patches, providing a clear audit trail and the ability to roll back edits if needed, offering peace of mind during complex dependency upgrades.

## Steps

1. Run the `Maven` dependency upgrade command (e.g., `./mvnw versions:use-latest-versions`) via Atlas's `bash` tool, capturing the full output.
2. Fetch the upgraded library's release notes and changelog using Atlas's `webfetch` tool to understand breaking changes.
3. Build the Quarkus project by executing `./mvnw clean install` via Atlas's `bash` tool to enumerate all compile-time errors.
4. Fix each identified error using Atlas's `edit` tool, leveraging `lsp`'s `goToDefinition` to inspect new API signatures in the upgraded package.
5. Re-run `JUnit 5 (@QuarkusTest)` tests with `./mvnw test` via Atlas's `bash` tool, repeating the fix-and-test cycle until all tests pass.
6. Review the unified diff of all changes proposed by Atlas, ensuring Quarkus-specific idioms and `application.properties` modifications are correct.
7. Let Atlas apply `Spotless` formatting by running `./mvnw spotless:apply` before staging and committing the changes via Atlas's `git` integration.

## FAQ

### How does Atlas handle `Maven` dependency conflicts during a Quarkus upgrade?

Atlas executes `Maven` commands via `bash` and captures the full output, including any dependency conflict warnings or errors. It then uses this information to inform its plan, potentially suggesting manual intervention or specific `pom.xml` adjustments, always presenting changes for your approval.

### Can Atlas fix build-time augmentation issues after a Quarkus library upgrade?

Yes, Atlas is aware of Quarkus's build-time augmentation. When fixing code, it aims to replace runtime reflection with build-time-friendly patterns, ensuring the class survives native-image compilation, as specified in its setup capabilities.

### What if the upgraded library requires changes to `application.properties` in Quarkus?

Atlas can read and modify `application.properties` files. If the library's release notes (fetched via `webfetch`) indicate new configuration is needed, Atlas can propose and apply these changes, presenting them in the unified diff for your review.

### How does Atlas ensure `JUnit 5 (@QuarkusTest)` cases are fixed correctly?

Atlas repeatedly runs `./mvnw test` via `bash` to validate fixes against your `JUnit 5 (@QuarkusTest)` suite. It uses the test output to identify failures and then applies `edit` operations, leveraging `lsp` to inspect new API signatures, until all tests pass.

### Does Atlas support native-image compatibility during Quarkus dependency upgrades?

Atlas is designed with Quarkus's native-image constraints in mind. It prioritizes replacing runtime reflection with build-time-friendly patterns and ensures that code changes are compatible with the native-image compilation process, as outlined in its setup steps.

### How does Atlas integrate with `Spotless` for Quarkus projects?

Atlas can execute `./mvnw spotless:apply` via `bash` as a final step before committing changes. This ensures that all code modifications made during the dependency upgrade adhere to your project's `Spotless` formatting rules, maintaining code consistency.

### Can I roll back changes if a Quarkus dependency upgrade causes unexpected issues?

Yes, Atlas integrates with `git`. It snapshots file changes as `git` patches, allowing you to easily review, diff, and roll back any edits made during the upgrade process, providing a safety net for complex migrations.

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Canonical HTML: https://runatlas.sh/resources/stacks/upgrade-a-dependency-and-fix-the-breakage-in-quarkus
Source of truth: aeo_pages row `/resources/stacks/upgrade-a-dependency-and-fix-the-breakage-in-quarkus` (segment: Stacks) (this file is generated from it, never hand-edited).
Licence: Atlas is proprietary with a free core. It is not open source and there is no public source repository.