升级到macOS Big Sur v11.0.1后错误的JAVA_HOME [英] Wrong JAVA_HOME after upgrade to macOS Big Sur v11.0.1

问题描述

在macOS上的设置中，我正在使用多个JDK，通过/usr/libexec/java_home 工具在它们之间进行切换，类似于

In my setup on macOS I'm working with several JDKs, switching between them via /usr/libexec/java_home tool, similar to a method described in this SO answer

升级到macOS Big Sur v11.0.1后，我的JAVA_HOME设置停止工作，始终报告相同的Java版本:

After upgrading to macOS Big Sur v11.0.1, my JAVA_HOME setting stopped working, always reporting the same java version:

% /usr/libexec/java_home -V
Matching Java Virtual Machines (5):
    11.0.8 (x86_64) "AdoptOpenJDK" - "AdoptOpenJDK 11" /Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home
    1.8.162.12 (x86_64) "Oracle Corporation" - "Java" /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
    1.8.0_162 (x86_64) "Oracle Corporation" - "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home
    1.8.0_45 (x86_64) "Oracle Corporation" - "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home
    1.7.0_45 (x86_64) "Oracle Corporation" - "Java SE 7" /Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home
/Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home

% /usr/libexec/java_home -v 1.8.162.12
/Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home

% /usr/libexec/java_home -v 1.7.0_45
/Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home

推荐答案

在macOS Big Sur v11.0.1中似乎/usr/libexec/java_home -v ... 命令的行为已更改:它对 JAVA_HOME 环境变量的先前设置的值敏感.

Seems in macOS Big Sur v11.0.1 the behavior of the /usr/libexec/java_home -v ... command has changed: it is sensitive to the previously set value of JAVA_HOME environment variable.

确切的行为尚不清楚，我找不到任何文档，但是在我的实验中，它报告了已经在 JAVA_HOME 中设置的版本，而与 -v 开关:

Exact behavior is not clear, I couldn't find any documentation on this, but in my experiments it reported the version already set in JAVA_HOME, regardless of the -v switch:

% JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home /usr/libexec/java_home -v 1.8.0_162
/Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home

此外，如果设置了 JAVA_HOME ，但没有指向有效的Java主页(对于 -V 也是如此)，我注意到它什么也没报告:

Additionally, I noticed that it reports nothing, if JAVA_HOME is set, but doesn't point to a valid java home (also for -V):

% JAVA_HOME=dummy /usr/libexec/java_home -v 1.7.0_45
% JAVA_HOME=dummy /usr/libexec/java_home -V
%

解决方案是确保在执行/usr/libexec/java_home 之前未设置 JAVA_HOME :

Solution is to ensure JAVA_HOME is not set before executing /usr/libexec/java_home:

% unset JAVA_HOME ; /usr/libexec/java_home -v 1.8.0_162
/Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home

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