Thanks. I have the feeling it is because of same major version. If Gradle JDK is Eclipse Temurin and runtime JDK is same version but OpenJ9 it fails.
Interestingly only in 11 (branch 9x). On main it worked for long time. Jdk17 as Gradle runtime by Temurin and openj9 as runtime. If runtime and Gradle VM is identical home dir it does not fork. Here is a flight difference and that matters. The alternate VM info is printed, but it looks like it f*cks up when providing options and something thinks it does not fork, but it does. > Task :altJvmWarning NOTE: Alternative java toolchain will be used for compilation and tests: Project will use 11 (IBM JDK 11.0.20.1+1, home at: /home/jenkins/tools/java/64bit/openj9/jdk-11.0.20) Gradle runs with 11 (Eclipse Temurin JDK 11.0.21+9, home at: /home/jenkins/tools/java/64bit/hotspot/jdk-11.0.21) On main branch it works, no idea why: > Task :altJvmWarning NOTE: Alternative java toolchain will be used for compilation and tests: Project will use 17 (IBM JDK 17.0.8.1+1, home at: /home/jenkins/tools/java/64bit/openj9/jdk-17.0.8) Gradle runs with 17 (Eclipse Temurin JDK 17.0.9+9, home at: /home/jenkins/tools/java/64bit/hotspot/jdk-17.0.9) In case you ask, die to randomized jvms the Jenkins job Always runs with default temurin minimum jdk for Gradle and just exchanges runtime for testing (because Gradle itself can't run on all JDKs out there). One other thing: if you set OpenJ9 as default jdk and run Gradle with it, it fails while building buildSrc: it can't compile the profiling stuff as flight recorder module does not ship with OpenJ9. We should possibly fix this, maybe by rewriting the code with pure Groovy class and not compile it at all. Uwe Am 12. November 2023 21:08:41 MEZ schrieb Dawid Weiss <dawid.we...@gmail.com>: >Hi Uwe, > >Will dig tomorrow. Maybe Dawid has an idea? It looks like the alternate >> runtime is correctly detected, but why is Gradle passing compiler runzine >> options without -J in just this case. In Main the same works where Gradle >> runs with Java17-Temurin and J9 is used as runtime. >> > >I think I know what this is - please let me verify and provide a PR, if >it's indeed that. > >Dawid -- Uwe Schindler Achterdiek 19, 28357 Bremen https://www.thetaphi.de
