Specify java location when starting Arduino IDE on MacOS

The Arduino IDE crashes whenever I try to launch it, shortly after showing the splash screen. Launching from the command line rather than the MacOS App I see an error:

$ /Applications/Arduino.app/Contents/MacOS/Arduino
...
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007fff203680a9, pid=17273, tid=0x0000000000000307
#
# JRE version: Java(TM) SE Runtime Environment (8.0_192-b12) (build 1.8.0_192-b12)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.192-b12 mixed mode bsd-amd64 compressed oops)
# Problematic frame:
# C  [libsystem_platform.dylib+0x10a9]  _platform_memmove$VARIANT$Haswell+0x29
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /private/tmp/hs_err_pid17273.log
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.java.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
[1]    17273 abort      /Applications/Arduino.app/Contents/MacOS/Arduino

Digging through the output above the error I see that it's using an old java jdk that I have installed:

2021-02-06 00:49:27.466 Arduino[17273:226248] -> JVM Runtime path: /Applications/Arduino.app/Contents/PlugIns/jre8u252-b09.jre
2021-02-06 00:49:27.466 Arduino[17273:226248] Searching for a Java 8 virtual machine
2021-02-06 00:49:27.466 Arduino[17273:226248] Search for java VM in '/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home'
2021-02-06 00:49:27.466 Arduino[17273:226248]   KO - error: 'launch path not accessible'
2021-02-06 00:49:27.483 Arduino[17273:226248] Search for java VM in '/Library/Java/JavaVirtualMachines/jdk1.8.0_192.jdk/Contents/Home'
2021-02-06 00:49:27.550 Arduino[17273:226248] -> JVM Runtime path updated to: /Library/Java/JavaVirtualMachines/jdk1.8.0_192.jdk
2021-02-06 00:49:27.550 Arduino[17273:226248] -> Java Runtime Dylib Path: '/Library/Java/JavaVirtualMachines/jdk1.8.0_192.jdk/Contents/Home/jre/lib/jli/libjli.dylib'

On a hunch I moved away the jdk1.8, and the problem was fixed!

However, I need this old jdk for testing some apps. Is there a way to specify the correct java path for the IDE? I tried setting JAVA_HOME and using jenv to switch versions, but the local shell variables seem to be ignored even when launching from the command line.

I don't know much about this subject, but I believe there have been some previous bug reports. I would recommend reading through the commentary there because I think there is probably some useful information:

Thanks, those issues did indeed cover the problem. They all suggest deleting 1.8 as the solution though, which is a tough pill for me to swallow. Hopefully the issue gets fixed soon.

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