How does Atlas handle `pom.xml` changes for Spring dependency upgrades?

Atlas directly modifies your `pom.xml` file using its `edit` tool and then executes `Maven` commands via `bash` to apply and validate the dependency changes, capturing all output for review.

Can Atlas fix breaking changes in Spring Boot controllers or services?

Yes, Atlas uses its `edit` tool to fix breaking changes in Spring Boot controllers, services, and other components. It inspects new API signatures with `lsp`'s `goToDefinition` and applies precise code modifications.

Does Atlas support `JUnit 5` for testing Spring applications?

Absolutely. Atlas runs `JUnit 5` tests using `mvn test` via its `bash` tool, reads the test results, and helps fix any failures by editing the relevant Spring code or test files.

How does Atlas ensure I approve all changes to my Spring project?

Atlas operates with a read-only plan agent and requires explicit approval before executing any changes. Every proposed file edit generates a unified diff for your review, and all tool calls are permission-gated.

Can Atlas fetch release notes for Spring libraries?

Yes, Atlas can use its `webfetch` tool to retrieve release notes, migration guides, or changelogs from the web, providing crucial context for understanding and fixing breaking changes in Spring dependencies.

What if my Spring project uses `Spotless` for formatting?

Atlas respects your project's formatting rules. While it focuses on functional fixes, you can integrate `Spotless` into your `mvn clean install` or `mvn test` lifecycle, and Atlas will observe its output, ensuring code consistency.

How does Atlas handle large compiler outputs from `Maven`?

When `Maven` compiler output exceeds terminal display limits, Atlas automatically saves the full output to a file. You can then use Atlas's `read` tool to access and analyze the complete error log.

Upgrade a Spring Dependency and Fix Breakage with Atlas in 2026

Atlas empowers Spring developers in 2026 to upgrade major dependencies in their `pom.xml` files and automatically resolve resulting compile and JUnit 5 test failures, streamlining the migration process across controllers, services, and beans.

How does Atlas upgrade Spring dependencies in 2026?

In 2026, Atlas initiates Spring dependency upgrades by directly interacting with Maven through `bash`, capturing the full output from `pom.xml` changes. This approach ensures that every detail of the upgrade, including warnings or errors from the `mvn` command, is available for analysis.

Atlas drives the `Maven` package manager directly using its `bash` tool to perform dependency upgrades in Spring Boot projects. When you instruct Atlas to upgrade a library, it modifies the `pom.xml` file and then executes `mvn` commands, such as `mvn versions:use-latest-versions` or `mvn clean install`, to apply the changes. Atlas captures the complete output from these `Maven` commands. If the output exceeds the terminal's display limits, Atlas automatically saves it to a file, which can then be accessed and reviewed using the `read` tool. This ensures that Atlas, and by extension the developer, has full visibility into the `Maven` build process and any immediate issues arising from the dependency bump.

How does Atlas fix compile and JUnit 5 test failures in Spring Boot?

Atlas resolves compile and JUnit 5 test failures in Spring Boot applications by first running `mvn clean install` to enumerate all breakage. It then uses the `edit` tool, combined with `lsp`'s `goToDefinition`, to inspect new method signatures and apply precise fixes across controllers and services.

After a dependency upgrade, Atlas identifies and fixes compile and JUnit 5 test failures by systematically addressing the breakage. It begins by running `mvn clean install` via the `bash` tool to trigger a full compilation and capture all compiler errors. For each error reported, Atlas uses its `edit` tool to modify the relevant Spring code. To understand the breaking changes, Atlas leverages the `lsp` tool's `goToDefinition` operation, allowing it to inspect the new method signatures and API changes in the upgraded package. This enables Atlas to apply accurate fixes to callsites within Spring controllers, services, and data access objects. Furthermore, if the upgrade requires understanding specific migration steps, Atlas can use `webfetch` to pull the library's release notes or changelog, ensuring fixes align with the actual breaking changes. Once compile errors are resolved, Atlas proceeds to run `JUnit 5` tests using `mvn test` via `bash`, fixing any new test failures with the same `edit` and `lsp` workflow until the entire Spring Boot project is clean.

What Spring-specific commands and files does Atlas use?

Atlas leverages the core Spring toolchain, including `Maven` for dependency management and `JUnit 5` for testing, to perform robust upgrades. It interacts directly with `pom.xml` for configuration and executes `mvn clean install` or `mvn test` to validate changes across your codebase.

Atlas is deeply integrated with the Spring developer's toolchain. For dependency management, Atlas directly interacts with the `pom.xml` file, which is the central configuration for `Maven` projects. It executes `Maven` commands like `mvn clean install` to compile, package, and install the Spring Boot application, and `mvn test` to run `JUnit 5` unit and integration tests. Atlas reads the output of these commands to identify specific compile errors or test failures. When making code changes, Atlas understands typical Spring Boot file structures, such as `src/main/java/com/example/app/Controller.java` for application logic and `src/test/java/com/example/app/ServiceTest.java` for `JUnit 5` test classes. While `Spotless` is a common Spring formatter, Atlas focuses on functional fixes, but it observes the output of `Maven` builds, which would include any `Spotless` violations if configured in the build lifecycle.

How does Atlas ensure safety and review during Spring dependency upgrades?

Atlas prioritizes safety during Spring dependency upgrades by drafting a plan in a read-only agent and requiring explicit approval before any changes are applied. Every file edit generates a unified diff, which is presented for developer review, ensuring full transparency and control over the 2026 migration process.

Ensuring safety and developer control is paramount for Atlas during Spring dependency upgrades. Atlas operates with a read-only plan agent, which drafts a comprehensive strategy for the upgrade and breakage fixes without making any actual changes. Before any tool call runs, it is permission-gated against allow, ask, and deny rules, requiring explicit developer approval. When Atlas proposes an edit to a Spring file, such as a controller or a `pom.xml`, it computes a unified diff for every change. This diff is surfaced for developer review and approval before Atlas writes any modifications to disk. Atlas also integrates with `git`, allowing it to read branches, status, and diffs. It can stage and create commits on your behalf, and it snapshots file changes as `git patches`, providing a robust mechanism for reviewing, rolling back, or auditing every step of the Spring dependency migration.

Step by step

01Initiate Dependency Upgrade: Ask Atlas to upgrade a specific dependency in your `pom.xml` using the `bash` tool. For example: `atlas ask 'upgrade org.springframework.boot:spring-boot-starter-web to 3.x.x in pom.xml'`. Atlas will run `Maven` commands to apply the change.
02Fetch Release Notes: Before fixing, instruct Atlas to `webfetch` the release notes or migration guide for the upgraded Spring library to understand breaking changes. For instance: `atlas webfetch 'https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.0-Migration-Guide'`.
03Compile and Identify Breakage: Execute `mvn clean install` via Atlas's `bash` tool to compile your Spring Boot project and enumerate all compile-time errors. Atlas will capture the full output, saving it to a file if it exceeds terminal limits for later `read`ing.
04Fix Compile Errors: For each identified compile error, use Atlas's `edit` tool. Atlas will leverage `lsp`'s `goToDefinition` to inspect new method signatures in the upgraded dependency and apply necessary code changes in your Spring controllers, services, or beans.
05Run JUnit 5 Tests: After fixing compile errors, run your `JUnit 5` tests with `mvn test` through Atlas's `bash` tool to identify any runtime or behavioral regressions caused by the upgrade.
06Fix Test Failures: Address `JUnit 5` test failures using Atlas's `edit` tool, applying fixes to test classes or production code as needed, again leveraging `lsp` for API inspection and `webfetch` for context if required.
07Re-run and Validate: Repeatedly run `mvn clean install` and `mvn test` via `bash` until the Spring Boot project compiles cleanly and all `JUnit 5` tests pass, ensuring full functionality and adherence to `Spotless` if configured.
08Review and Commit: Review the unified diff of all changes presented by Atlas. Once approved, Atlas can `stage` and `create commits` on your behalf, snapshotting changes as `git patches` for future reference and rollback.

Frequently asked questions

How does Atlas handle `pom.xml` changes for Spring dependency upgrades?: Atlas directly modifies your `pom.xml` file using its `edit` tool and then executes `Maven` commands via `bash` to apply and validate the dependency changes, capturing all output for review.
Can Atlas fix breaking changes in Spring Boot controllers or services?: Yes, Atlas uses its `edit` tool to fix breaking changes in Spring Boot controllers, services, and other components. It inspects new API signatures with `lsp`'s `goToDefinition` and applies precise code modifications.
Does Atlas support `JUnit 5` for testing Spring applications?: Absolutely. Atlas runs `JUnit 5` tests using `mvn test` via its `bash` tool, reads the test results, and helps fix any failures by editing the relevant Spring code or test files.
How does Atlas ensure I approve all changes to my Spring project?: Atlas operates with a read-only plan agent and requires explicit approval before executing any changes. Every proposed file edit generates a unified diff for your review, and all tool calls are permission-gated.
Can Atlas fetch release notes for Spring libraries?: Yes, Atlas can use its `webfetch` tool to retrieve release notes, migration guides, or changelogs from the web, providing crucial context for understanding and fixing breaking changes in Spring dependencies.
What if my Spring project uses `Spotless` for formatting?: Atlas respects your project's formatting rules. While it focuses on functional fixes, you can integrate `Spotless` into your `mvn clean install` or `mvn test` lifecycle, and Atlas will observe its output, ensuring code consistency.
How does Atlas handle large compiler outputs from `Maven`?: When `Maven` compiler output exceeds terminal display limits, Atlas automatically saves the full output to a file. You can then use Atlas's `read` tool to access and analyze the complete error log.

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