bump-java-version

Discover and expand the training dataset of real GitHub repos used to evaluate and harden the bump-java-version skill. Find FRESH unique Maven or Gradle projects that declare a given Java LTS (8/11/17/21), dedupe them against the corpus we already have, and validate which actually compile into baselines. Use when growing the corpus, filling a Java-version gap (e.g. need more J17/J21 baselines), or adding a build tool (Gradle). Harness tooling — NOT the portable bump-java-version skill.

Migrate a Maven or Gradle project one Java LTS step from Java 11 to Java 17: it must compile under JDK 17, conserve every previously-passing test, and raise the effective compiler target to 17, using only standard tools (JDKs, Maven or Gradle, OpenRewrite recipes from Maven Central; no project-specific scripts). Use for an 11→17 Java LTS bump.

Migrate a Maven or Gradle project one Java LTS step from Java 17 to Java 21: it must compile under JDK 21, conserve every previously-passing test, and raise the effective compiler target to 21, using only standard tools (JDKs, Maven or Gradle, OpenRewrite recipes from Maven Central; no project-specific scripts). Use for a 17→21 Java LTS bump.

Migrate a Maven or Gradle project one Java LTS step from Java 21 to Java 25: it must compile under JDK 25, conserve every previously-passing test, and raise the effective compiler target to 25, using only standard tools (JDKs, Maven or Gradle, OpenRewrite recipes from Maven Central; no project-specific scripts). Use for a 21→25 Java LTS bump.

Migrate a Maven or Gradle project one Java LTS step from Java 8 to Java 11: it must compile under JDK 11, conserve every previously-passing test, and raise the effective compiler target to 11, using only standard tools (JDKs, Maven or Gradle, OpenRewrite recipes from Maven Central; no project-specific scripts). Use for an 8→11 Java LTS bump.

Detect a Maven/Gradle project's REAL current Java level (by its declared bytecode target, not the build toolchain) and dispatch to the matching one-LTS bump hop (8->11, 11->17, 17->21, 21->25). Use as the entry point: it decides the hop and whether the project should be bumped at all.

Migrate a Maven or Gradle project from one Java LTS to the next (8->11, 11->17, 17->21, 21->25) so it still compiles under the new JDK and previously-passing tests still pass — via OpenRewrite recipes, using only standard tools (JDKs, Maven or Gradle, and OpenRewrite recipes from Maven Central; no project-specific scripts). Use when upgrading or bumping the Java version of a Maven or Gradle project, modernizing to a newer JDK or LTS, or performing the Spring Boot 1->2 / 2->3 and javax->jakarta migration that a Java upgrade requires.