Java

Maven CLI invocation patterns. Use whenever running `mvn` commands in Java/Maven projects. Covers when `-am` is required, why `-o` (offline) mode hides bugs in multi-worktree setups, and how to verify compile/test cleanly without trusting stale `~/.m2` artifacts.

OpenRewrite recipe test maintenance. Use when fixing test failures, import ordering issues, type validation problems, IDE warnings, or writing comprehensive recipe tests.

Enforce Maven POM dependency ordering rules. This skill should be used when editing pom.xml files.

OpenRewrite recipe authoring patterns and API best practices. Use when writing or editing OpenRewrite recipe Java source code (visitors, matchers, type checks, templates, metadata, YAML config, list transformations, at-scale validation).

Apply every configured OpenRewrite recipe with violations on a dedicated branch, creating one commit per named leaf recipe and verifying the cumulative result. Use when asked to fix all OpenRewrite violations, create an OpenRewrite cleanup branch, or commit recipe changes separately.

Diagnose Liquibase change-log lock failures in Maven tests and remove only stale H2 database files from build output directories before rerunning the affected tests. Use when failures contain "Could not acquire change log lock", "Currently locked by", or `liquibase.exception.LockException`.

Dry-run configured OpenRewrite recipes, count and rank violations, and optionally run one selected recipe without committing. Use when asked to analyze OpenRewrite recipes, report rule violations, inspect a rewrite dry run, or compare which recipes would change the most files.