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# community-supports
Slackbot
05/09/2023, 6:18 PMThis message was deleted.
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Chris Lee
05/09/2023, 6:24 PMunsupported class file version 63 indicates you are running Gradle (or some tool within) with an older Java version - upgrade to at least Java 18 (class file version 63).
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Alfonso De La Guardia
05/09/2023, 6:24 PMSo I must update to Java 18?
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Chris Lee
05/09/2023, 6:25 PMas noted, yes, something in your build is depending on at least that version of Java.
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Alfonso De La Guardia
05/09/2023, 6:26 PMBut Im using JAVA 19
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Chris Lee
05/09/2023, 6:27 PMNope. Some component of that build is using pre-Java 18, hence the incompatibility. Unfamiliar with Android builds, you’ll have to track down which component is the problem.
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Alfonso De La Guardia
05/09/2023, 6:27 PMit's Luxon.js
Alfonso De La Guardia
05/09/2023, 6:27 PMSo then, I have to DOWNgrade, my java version?
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Chris Lee
05/09/2023, 6:28 PMThere is some component of the build that requires at least Java 18 but is using < Java 18 - track that down and adjust accordingly.
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Alfonso De La Guardia
05/09/2023, 6:29 PMand how do I track it down?
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Chris Lee
05/09/2023, 6:29 PMtry running Gradle with --debug and start by analyzing the output.
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Alfonso De La Guardia
05/09/2023, 6:30 PMyou mean like.. yarn run gradle --debug?
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Chris Lee
05/09/2023, 6:30 PMno idea about that yarn stuff
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Alfonso De La Guardia
05/09/2023, 6:31 PMit's almost the same as "npm"
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Vampire
05/09/2023, 6:34 PMThere is some component of the build that requires at least Java 18 but is using < Java 18 - track that down and adjust accordingly.Nope, it is him running Gradle 7.2 with Java 19 which is not supported.
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Vampire
05/09/2023, 6:34 PMa
Alfonso De La Guardia
05/09/2023, 6:34 PMSo I have to update my Gradle?
Alfonso De La Guardia
05/09/2023, 6:34 PMHow do I do it?
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Vampire
05/09/2023, 6:35 PMEither use a newer Gradle version or an older - compatible - Java version to run it.
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Alfonso De La Guardia
05/09/2023, 6:35 PMi prefer to upgrade gradle
Alfonso De La Guardia
05/09/2023, 6:35 PMhow can I do it?
Alfonso De La Guardia
05/09/2023, 6:36 PMIm working with a team. If I upgrade gradle, it will affect all the branches of the repo? or is it something like only local for me?
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Vampire
05/09/2023, 6:37 PMIf the project is sane, it contains the Gradle wrapper, so it will be for everyone.
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Alfonso De La Guardia
05/09/2023, 6:37 PMso. in my case, it would be better to downgrade my java version?
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Vampire
05/09/2023, 6:37 PMThe Gradle wrapper defines with which Gradle version a project is built so that there can be no incompatiblities due to different versions like in Maven.
Vampire
05/09/2023, 6:38 PMso. in my case, it would be better to downgrade my java version?How should we know? It is (almost) always good to update to latest versions. But if you don't want to, then yes you need to downgrade your Java.
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Alfonso De La Guardia
05/09/2023, 6:40 PMyes, but as you said, upgrading Gradle could affect all the other branches if I do a git push...
where as I assume grading my java version locally on my laptop, won't affect anybody else but me
Alfonso De La Guardia
05/09/2023, 6:40 PMthat's why I mean it would be better to downgrade my java
Alfonso De La Guardia
05/09/2023, 6:51 PMOk I've downgraded my JAVA version. Now let's see if this works
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Vampire
05/09/2023, 7:01 PMIt will not affect other branches. It affects wherever you push it. If you only push it in one branch it only affects that branch like with any other code change.
Vampire
05/09/2023, 7:01 PMBut yeah, to only affect you, use a compatible Java version
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Alfonso De La Guardia
05/09/2023, 7:01 PMyes of course, what I want is to not affect anybody else
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