chore: study bumping the Java baseline from 17 to 21 - #6890
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Study PR, not intended for merge as-is: measure the impact of requiring Java 21, notably to evaluate whether virtual threads (JEP 444, stable in 21) become a viable alternative for running the Spoon pipeline on a growable stack (see INRIA#6804, INRIA#6882). - spoon-pom: maven.compiler.release/testRelease 17 -> 21 - CI: drop Java 17 from the test matrix, Windows tests on 21 - flake.nix: default dev shell is now jdk21 Co-Authored-By: agentknit+k3 <agentknit+k3@monperrus.com>
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Summary
Study PR — opened to measure impact, not necessarily to merge.
Bumps Spoon's Java baseline from 17 to 21 and lets CI show the consequences. Motivation: Java 21 makes virtual threads final (JEP 444), which would give the Spoon pipeline a heap-grown stack for free — a candidate alternative to #6882's sized platform thread for fixing #6804 (stack overflow on legal deeply nested expressions, e.g. OpenJDK's
DeepStringConcat.javawith ~32,000 binary operators). See also @SirYwell's comment on #6882.Changes
spoon-pom/pom.xml:maven.compiler.release/testRelease17 → 21.github/workflows/tests.yml: drop Java 17 from the matrix, Windows tests on 21flake.nix: default dev shelljdk17→jdk21(thejdk17shell definition stays available)Refs #6804, #6882
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