/usr/libexec/java_home is completely broken on Big Sur

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Created Nov ’20

Replies 17

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Is /usr/libexec/java_home working on Big Sur for anyone?
It won't output anything unless the JAVA_HOME environment variable is already set. When querying for the home folder for a specific version of the JDK, it always just returns the current value of the JAVA_HOME environment variable. Since the only useful purpose of the java_home tool is to get a value for setting JAVA_HOME, this is somewhat backwards and useless.

I reported this against Big Sur betas but that didn't get anywhere. In one case I was actually told it was working as designed, which is clearly not the case.

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Answer 1

Jyong OP

Nov ’20

I'm facing the same problem exactly like yours with a new fresh installed Big Sur.

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Answer 2

norimsu OP

Nov ’20

me too.

if already set $JAVA_HOME, /usr/libexec/java_home -v {{VERSION}} return $JAVA_HOME

so i just vim ~/.zprofile

Code Block shell#alias setJDK7='unset JAVA_HOME;export JAVA_HOME=`/usr/libexec/java_home -v 1.7`'alias setJDK8='unset JAVA_HOME;export JAVA_HOME=`/usr/libexec/java_home -v 1.8`'alias setJDK11='unset JAVA_HOME;export JAVA_HOME=`/usr/libexec/java_home -v 11`'

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Answer 3

swpalmer OP

Nov ’20

In my case if JAVA_HOME is not set, then the java_home command will not output anything at all.
Even the -V option or --xml option that lists what is available doesn't work unless JAVA_HOME is already set to a valid JDK folder.

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Answer 4

swpalmer OP

Nov ’20

I should correct my last comment. If JAVA_HOME is completely unset, then it is possible to get useful output from /usr/lib/java_home. However, if it is set to a value that is not a valid path to one of the installed JDKs, then the java_home command will not function at all. This includes if JAVA_HOME is set to an empty string (which is why I was a bit confused before). If JAVA_HOME is set to an empty string or an invalid path, /usr/libexec/java_home is useless.
This is a significant change in behaviour from prior versions of macOS.

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Answer 5

murraytodd OP

Nov ’20

I've got a slightly different behavior. For some reason javahome will always return "/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home" regardless of what I give it with the -v flag.

If I say "javahome -V", it will show all the VMs...

$ /usr/libexec/java_home -V

Code Block Matching Java Virtual Machines (5):    15 (x86_64) "AdoptOpenJDK" - "AdoptOpenJDK 15" /Library/Java/JavaVirtualMachines/adoptopenjdk-15.jdk/Contents/Home    13.0.1 (x86_64) "Oracle Corporation" - "Java SE 13.0.1" /Library/Java/JavaVirtualMachines/jdk-13.0.1.jdk/Contents/Home    11.0.5 (x86_64) "Oracle Corporation" - "Java SE 11.0.5" /Library/Java/JavaVirtualMachines/jdk-11.0.5.jdk/Contents/Home    1.8.271.09 (x86_64) "Oracle Corporation" - "Java" /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home    1.8.0_271 (x86_64) "Oracle Corporation" - "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_271.jdk/Contents/Home

But again, no matter what I try to do to get a real JDK, it always gives the same /Library/Internat Plug-ins directory, which isn't a full JDK, so all development apps break.

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Answer 6

yaskota OP

Nov ’20

[Replying to Jyong's initial post]

Same here. Interestingly, iirc, the first time I experienced the error ("The "c++filt" command requires the command line developer tools.") didn't appear until almost 24 hours after my upgrade from Catalina to Big Sur.

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Answer 7

akshit3010 OP

Nov ’20

I am also facing the same issue.Please suggest the possible solution.

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Answer 8

PhilipPeake OP

Dec ’20

The problem of /usr/libexec/javahome not working correctly if JAVAHOME is set is one problem, and you can hack that in your shell profile by unsetting JAVAHOME before running it.

However, this doesn't fix the problem of applications launched via the GUI. Most of those don't work.
Hacking individual ones to make setting the JAVAHOME variable then exposes the next problem:

JAVA_HOME contains /Library/Internet Plug-Ins/JavaAppletPlugin.plugin

Note the space. So things just **** up later. Someone needs to learn that spaces in file/directory names are NOT a good idea in Unix based systems.

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Answer 9

Gilles_FABRE OP

Dec ’20

Still no new from @Apple ?
I'm still completely blocked

0

Answer 10

DhavalD OP

Dec ’20

1 The problem still persists!

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Answer 11

Johnson86 OP

Jan ’21

I'm also facing this problem.so no one can fix it ?

0

Answer 12

Simon-Kenny OP

Jan ’21

Same issue, fixed by following this Stack Overflow answer: https://stackoverflow.com/a/64917842

TLDR, java_home is how affected by environment variable JAVA_HOME and reports this value, ignoring the parameter. It appears to me this is a bug.

You can get around it by unsetting env var JAVA_HOME before using, e.g.

Code Block bashunset JAVA_HOME ; /usr/libexec/java_home -v 1.8

^ this works for me as I have JDK 8 and 15 installed.

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Answer 13

peterdewinter OP

Jan ’21

If you have a oracle JDK or JRE installed shit will hit the fan. I've had the same issue.

You can check if oracle is hijacking your system with:

Code Block bash$/usr/libexec/java_home -VMatching Java Virtual Machines (4):    15.0.1 (x86_64) "UNDEFINED" - "OpenJDK 15.0.1" /usr/local/Cellar/openjdk/15.0.1/libexec/openjdk.jdk/Contents/Home    1.8.191.12 (x86_64) "Oracle Corporation" - "Java" /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home    1.8.0_275 (x86_64) "Amazon" - "Amazon Corretto 8" /Users/hellothere/Library/Java/JavaVirtualMachines/corretto-1.8.0_275/Contents/Home    1.8.0_272 (x86_64) "Amazon" - "Amazon Corretto 8" /Library/Java/JavaVirtualMachines/amazon-corretto-8.jdk/Contents/Home/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home

You can fix this by a self-uninstall tool called "rm -rf". After that "/usr/libexec/java_home" will behave as you expect it to.

Code Block bashsudo rm -fr /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin sudo rm -fr /Library/PreferencePanes/JavaControlPanel.prefpane

Just for your ease, I use the following script in my .zprofile to easily switch JDK:

Code Block bash# Simple function allowing you to easyly switch version of javafunction setjdk() {  if [ $# -ne 0 ]; then   removeFromPath '/System/Library/Frameworks/JavaVM.framework/Home/bin'   if [ -n "${JAVA_HOME+x}" ]; then    removeFromPath $JAVA_HOME   fi   unset JAVA_HOME   export JAVA_HOME=`/usr/libexec/java_home -v $@`   export PATH=$JAVA_HOME/bin:$PATH  fi } function removeFromPath() {  export PATH=$(echo $PATH | sed -E -e "s;:$1;;" -e "s;$1:?;;") }setjdk 1.8 # set initial version

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