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Ran 29 Jan 2026 04:09AM UTC

Files 1182

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Committed 29 Jan 2026 03:41AM UTC coverage: 42.699%. Remained the same

Job # 21464747587.6

Build Type

push

github

Committed by

web-flow

Commit Message

Fix non-deterministic JDK preparation script causing cache misses (Cherry-pick of #23036) (#23042)

The JDK preparation script (`jdk.sh`) embeds the output of `java
-version` as a comment. However, when Coursier downloads the JDK, it
outputs progress messages to stderr which get mixed with the actual
`java -version` output.

These progress messages are non-deterministic (contain timing info like
"Still downloading", "Downloaded", etc.) which causes the script content
to vary between runs, resulting in different cache keys for all JVM
compilation tasks.

This fix filters out Coursier download progress messages from the
captured stderr, keeping only the actual `java -version` output lines.

Impact: In testing, this reduced cache misses from 92% to 0.09% for JVM
builds across runs.

Co-authored-by: Shaked Kaplan <102214568+kaplan-shaked@users.noreply.github.com>

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