错误：未正确定义JAVA_HOME正在执行maven [英] Error: JAVA_HOME is not defined correctly executing maven

问题描述

我安装了java并设置了环境路径，当我执行 echo $ JAVA_HOME 时，我得到以下输出：

I installed java and set path to environment and when I execute echo $JAVA_HOME I get the following output:

/usr/lib/jvm/java-7-oracle/jre/bin/java

我还安装了 apache-maven 并更改了 environment 文件，现在它看起来像这样：

I Also installed apache-maven and changed environment file and now it looks like this:

JAVA_HOME="/usr/lib/jvm/java-7-oracle/jre/bin/java"
M2_HOME=/usr/local/apache-maven/apache-maven-3.0.5
M2=$M2_HOME/bin
MAVEN_OPTS="-Xms256m -Xmx512m"
PATH=$M2:$PATH

但是当我执行 mvn --version 我收到警告：

But when I execute mvn --version I get a warning:

Error: JAVA_HOME is not defined correctly.
  We cannot execute /usr/lib/jvm/java-7-oracle/jre/bin/java/bin/java

无法找出最终重复的原因 / bin / java / bin / java

Can not find out why it repeats in the end /bin/java/bin/java

推荐答案

假设您使用bash shell并使用Oracle安装程序安装Java，您可以将以下内容添加到 .bash_profile

Assuming you use bash shell and installed Java with the Oracle installer, you could add the following to your .bash_profile

export JAVA_HOME=$(/usr/libexec/java_home)
export PATH=$JAVA_HOME/jre/bin:$PATH

这将选择正确的 JAVA_HOME 为由Oracle安装程序定义并将其首先设置在 $ PATH 中，确保找到它。

This would pick the correct JAVA_HOME as defined by the Oracle installer and will set it first in your $PATH making sure it is found.

此外，更新Java后，您无需在以后更改它。

Also, you don't need to change it later when updating Java.

编辑

根据评论：

重启后使其持久

Making it persistent after a reboot

只需在shell配置文件中添加这些行。 （假设它是 bash ）

Just add those lines in the shell configuration file. (Assuming it's bash)

Ex： .bashrc ， .bash_profile 或 .profile （对于ubuntu）

Ex: .bashrc, .bash_profile or .profile (for ubuntu)

使用自定义Java安装

Using a custom Java installation

设置 JAVA_HOME 到没有 $（）的自定义Java安装路径的根文件夹。

Set JAVA_HOME to the root folder of the custom Java installation path without the $().

Ex： JAVA_HOME = / opt / java / openjdk

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