JAVA_HOME 和 PATH 已设置，但 java -version 仍显示旧版本

2022-01-15 00:00:00 environment-variables linux linux-mint java

我正在使用 Linux Mint Cinnamon 14.我在 ~/.profile 中设置了 $JAVA_HOME 和 $PATH 环境变量，如下所示:

I am using Linux Mint Cinnamon 14. I have set the $JAVA_HOME and $PATH environment variables in ~/.profile as follows:

export JAVA_HOME=/home/aqeel/development/jdk/jdk1.6.0_35
export PATH=/home/aqeel/development/jdk/jdk1.6.0_35/bin:$PATH

然后我做了 source ~/.profile 以进行适当的更改.

I then did source ~/.profile to make the proper changes.

当我执行 java -version 命令检查活动的 java 版本时，它显示默认的(已经安装的 open-jdk)java 版本.如何用我下载的 open-jdk 覆盖默认的 open-jdk?

When I execute java -version command to check the active java version, it shows the default (already installed open-jdk) java version. How can I override the default open-jdk with the one I downloaded?

更新:

哪个java说/usr/bin/java

which java says /usr/bin/java

$JAVA_HOME/bin/java -version 说权限被拒绝"

sudo $JAVA_HOME/bin/java -version(然后要求输入密码)说找不到命令

sudo $JAVA_HOME/bin/java -version (asks for password, then) says Command not found

但是cd $JAVA_HOME/bin，而ls显示是正确的目录.

but cd $JAVA_HOME/bin, and ls shows that it is right directory.

推荐答案

虽然您的设置看起来是正确的，但有几件事需要检查:

While it looks like your setup is correct, there are a few things to check:

  1. env 的输出 - 特别是 PATH.
  2. command -v java 告诉你什么?
  3. $JAVA_HOMEin 中是否有一个java 可执行文件，它是否设置了执行位?如果不是 chmod a+x java 它.
  1. The output of env - specifically PATH.
  2. command -v java tells you what?
  3. Is there a java executable in $JAVA_HOMEin and does it have the execute bit set? If not chmod a+x java it.

我相信在添加/更改 JAVA_HOME 和 PATH 之后，您的 .profile 已经 source 了?

I trust you have source'd your .profile after adding/changing the JAVA_HOME and PATH?

另外，您可以通过编写以下代码来帮助自己在将来维护 JDK 安装:

Also, you can help yourself in future maintenance of your JDK installation by writing this instead:

export JAVA_HOME=/home/aqeel/development/jdk/jdk1.6.0_35
export PATH=$JAVA_HOME/bin:$PATH

那么你在安装JDK的时候只需要更新一个环境变量.

Then you only need to update one env variable when you setup the JDK installation.

最后，您可能需要运行 hash -r 来清除 Bash 程序缓存.其他 shell 可能需要类似的命令.

Finally, you may need to run hash -r to clear the Bash program cache. Other shells may need a similar command.

干杯，

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