Update readme for ubuntu sudo java_home behavior#1013
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Pull request overview
Adds a documentation note explaining why Java selected by actions/setup-java may not be used when commands are executed via sudo on Ubuntu GitHub-hosted runners, aligning the README with the behavior described in issue #997.
Changes:
- Document that
sudoon Ubuntu runners may not inheritJAVA_HOME/PATHconfigured bysetup-java. - Clarify a common cause of “wrong JDK version” reports when using elevated commands.
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| **NOTE:** Oracle JDK 17 licensing varies by patch level. As shown on the [JDK 17 Archive](https://www.oracle.com/java/technologies/javase/jdk17-archive-downloads.html) (versions up to 17.0.12 are under the [NFTC](https://www.oracle.com/downloads/licenses/no-fee-license.html) license) and the [JDK 17.0.13+ Archive](https://www.oracle.com/java/technologies/javase/jdk17-0-13-later-archive-downloads.html) (versions 17.0.13 and later are under the [OTN](https://www.oracle.com/downloads/licenses/javase-license1.html) license). To stay on the free NFTC license, use `distribution: 'oracle'` with `java-version: '17.0.12'` (or earlier) instead of the floating `'17'`. Alternatively, upgrade to Oracle JDK 21+, which remains under the NFTC license. | ||
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| **NOTE:** On Ubuntu runners, commands executed via `sudo` do not inherit the `JAVA_HOME` and `PATH` set by `setup-java` and will fall back to the runner image's system-default JDK. |
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Description:
Adds a README note that sudo on Ubuntu runners falls back to the system JDK because JAVA_HOME/PATH aren't inherited.
Related issue:
#997
Check list: