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

问题描述

我安装了 java 并设置了路径环境，当我在终端中运行 echo $JAVA_HOME 时，我得到以下输出:

I installed java and set the path environment and when I run echo $JAVA_HOME in the terminal 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 时，我收到一个警告:

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

找不到为什么会重复到最后/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 并通过 Oracle 安装程序安装了 Java，您可以将以下内容添加到您的 .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 Oracle 安装程序定义的正确 JAVA_HOME，并首先在您的 $PATH 中设置它，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，以后更新 Java 时也不需要更改它.

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

编辑

根据评论:

重新启动后使其持久化

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)

例如:.bashrc、.bash_profile 或 .profile(对于 ubuntu)

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

使用自定义 Java 安装

将JAVA_HOME设置为不带$()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 $().

例如:JAVA_HOME=/opt/java/openjdk

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