错误：JAVA_HOME 未正确定义执行 maven
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Error: JAVA_HOME is not defined correctly executing maven
提问by user3127896
I installed java and set path to environment and when I execute echo $JAVA_HOMEI get the following output:
我安装了 java 并设置了环境路径，当我执行时，echo $JAVA_HOME我得到以下输出：
/usr/lib/jvm/java-7-oracle/jre/bin/java
I Also installed apache-mavenand changed environmentfile and now it looks like this:
我还安装apache-maven并更改了environment文件，现在看起来像这样：
JAVA_HOME="/usr/lib/jvm/java-7-oracle/jre/bin/java"
M2_HOME=/usr/local/apache-maven/apache-maven-3.0.5
M2=$M2_HOME/bin
MAVEN_OPTS="-Xms256m -Xmx512m"
PATH=$M2:$PATH
But when I execute mvn --versionI get a warning:
但是当我执行时，mvn --version我收到一个警告：
Error: JAVA_HOME is not defined correctly.
We cannot execute /usr/lib/jvm/java-7-oracle/jre/bin/java/bin/java
Can not find out why it repeats in the end /bin/java/bin/java
不知道为什么最后会重复 /bin/java/bin/java
采纳答案by rbento
Assuming you use bash shell and installed Java with the Oracle installer, you could add the following to your .bash_profile
假设您使用 bash shell 并使用 Oracle 安装程序安装了 Java，您可以将以下内容添加到您的 .bash_profile
export JAVA_HOME=$(/usr/libexec/java_home)
export PATH=$JAVA_HOME/jre/bin:$PATH
This would pick the correct JAVA_HOMEas defined by the Oracle installer and will set it first in your $PATHmaking sure it is found.
这将选择JAVA_HOMEOracle 安装程序定义的正确值，并将首先设置它以$PATH确保找到它。
Also, you don't need to change it later when updating Java.
此外，您以后在更新 Java 时不需要更改它。
EDIT
编辑
As per the comments:
根据评论：
Making it persistent after a reboot
重新启动后使其持久化
Just add those lines in the shell configuration file. (Assuming it's bash)
只需在 shell 配置文件中添加这些行。（假设是bash）
Ex: .bashrc, .bash_profileor .profile(for ubuntu)
例如：.bashrc，.bash_profile或.profile（对于 ubuntu）
Using a custom Java installation
使用自定义 Java 安装
Set JAVA_HOMEto the root folder of the custom Java installation path without the $().
设置JAVA_HOME为自定义 Java 安装路径的根文件夹，不带$().
Ex: JAVA_HOME=/opt/java/openjdk
前任： JAVA_HOME=/opt/java/openjdk
回答by talex
JAVA_HOME should be /usr/lib/jvm/java-7-oracle/jre/.
JAVA_HOME 应该是/usr/lib/jvm/java-7-oracle/jre/.
回答by Mureinik
$JAVA_HOMEshould be the directory where java was installed, not one of its parts:
$JAVA_HOME应该是安装 java 的目录，而不是它的一部分：
export JAVA_HOME=/usr/lib/jvm/java-7-oracle
回答by trenixjetix
You must take the whole directory where java is installed, in my case:
在我的情况下，您必须获取安装 java 的整个目录：
export JAVA_HOME=/usr/java/jdk1.8.0_31
回答by rohit sawant
set as it is export JAVA_HOME=/usr/java/jdk1.8.0_31.and run with sudo it will execute..
设置为 export JAVA_HOME=/usr/java/jdk1.8.0_31.and 用 sudo 运行它会执行..
回答by Jad B.
Firstly, in a development mode, you should use JDK instead of the JRE. Secondly, the JAVA_HOME is where you install Java and where all the others frameworks will search for what they need (JRE,javac,...)
首先，在开发模式下，你应该使用JDK而不是JRE。其次，JAVA_HOME 是您安装 Java 的地方，也是所有其他框架将搜索所需内容的地方（JRE、javac 等）
So if you set
所以如果你设置
JAVA_HOME=/usr/lib/jvm/java-7-oracle/jre/bin/java
JAVA_HOME=/usr/lib/jvm/java-7-oracle/jre/bin/java
when you run a "mvn" command, Maven will try to access to the java by adding /bin/java, thinking that the JAVA_HOME is in the root directory of Java installation.
当你运行“mvn”命令时，Maven会尝试通过添加/bin/java来访问java，认为JAVA_HOME在Java安装的根目录下。
But setting
但设置
JAVA_HOME=/usr/lib/jvm/java-7-oracle/
JAVA_HOME=/usr/lib/jvm/java-7-oracle/
Maven will access add bin/java then it will work just fine.
Maven 将访问 add bin/java 然后它会工作得很好。
回答by Juan Manuel Garcia Carmona
We open a terminal and look for the location of java:
我们打开一个终端，寻找java的位置：
manuel@zonademanel:~ → whereis java
java: /usr/bin/java /etc/java /usr/bin/X11/java /usr/share/java /usr/share/man/man1/java.1.gz
java: /usr/bin/java /etc/java /usr/bin/X11/java /usr/share/java /usr/share/man/man1/java.1.gz
What we are looking for is /usr/bin/java continue on the command line to find the absolute path , as this is only a symbolic link.
我们正在寻找的是 /usr/bin/java 在命令行上继续查找绝对路径，因为这只是一个符号链接。
manuel@zonademanel:~ → ls -lah /usr/bin/java
lrwxrwxrwx 1 root root 22 may 19 2015 /usr/bin/java -> /etc/alternatives/java
lrwxrwxrwx 1 root root 22 May 19 2015 /usr/bin/java -> /etc/alternatives/java
manuel@zonademanel:~ → ls -lah /etc/alternatives/java
lrwxrwxrwx 1 root root 39 dic 7 11:52 /etc/alternatives/java -> /usr/lib/jvm/java-8-oracle/jre/bin/java
lrwxrwxrwx 1 root root 39 dic 7 11:52 /etc/alternatives/java -> /usr/lib/jvm/java-8-oracle/jre/bin/java
I modified my /etc/environmentfile with the following values
我使用以下值修改了我的/etc/environment文件
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/usr/lib/jvm/java-8-oracle/jre/bin" JAVA_HOME="/usr/lib/jvm/java-8-oracle/jre"
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games: /usr/lib/ jvm/java-8-oracle/jre/bin" JAVA_HOME=" /usr/lib/jvm/java-8-oracle/jre"
If I do not want to relogin I can reload the changes with:
如果我不想重新登录，我可以重新加载更改：
source /etc/environment
??And run mvn -versioncorrectly
??并正确运行mvn -version
manuel@zonademanel:~ → mvn -version
Apache Maven 3.0.5
Maven home: /usr/share/maven
Java version: 1.8.0_77, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-8-oracle/jre
Default locale: es_MX, platform encoding: UTF-8
OS name: "linux", version: "3.16.0-70-generic", arch: "amd64", family: "unix"
Apache Maven 3.0.5
Maven 主页：/usr/share/maven
Java 版本：1.8.0_77，供应商：Oracle Corporation
Java 主页：/usr/lib/jvm/java-8-oracle/jre
默认语言环境：es_MX，平台编码： UTF-8
操作系统名称：“linux”，版本：“3.16.0-70-generic”，arch：“amd64”，系列：“unix”
回答by tk_
You might get this error due to couple of reasons. To fix this quickly please follow below steps,
由于几个原因，您可能会收到此错误。要快速解决此问题，请按照以下步骤操作，
First find the java location. To get a list of your installed Java platforms, run the following command from the terminal:
首先找到java位置。要获取已安装 Java 平台的列表，请从终端运行以下命令：
$ sudo update-alternatives --config java
Now set JAVA_HOME and PATH,
现在设置 JAVA_HOME 和 PATH，
$ export JAVA_HOME=<java_home>
$ export PATH=$JAVA_HOME/jre/bin:$PATH
Create the symlink
创建符号链接
$ sudo ln -s <java_home>/jre <java_symlink_path>
When we take your case as a example :
当我们以您的案例为例时：
$ sudo ln -s /usr/lib/jvm/java-7-oracle/jre /usr/lib/jvm/java-7-oracle/jre/bin/java
Above command will create the symlink location where the system is trying to find in your issue.
上面的命令将创建系统试图在您的问题中找到的符号链接位置。
Finally do the
最后做
$ mvn --version
回答by Shubham Verma
It happens because of the reason mentioned below :
发生这种情况是因为下面提到的原因：
If you see the mvn script: The code fails here ---
如果您看到 mvn 脚本：代码在此处失败 ---
Steps for debugging and fixing:
调试和修复步骤：
Step 1: Open the mvn script /Users/Username/apache-maven-3.0.5/bin/mvn (Open with the less command like: less /Users/Username/apache-maven-3.0.5/bin/mvn)
第 1 步：打开 mvn 脚本 /Users/Username/apache-maven-3.0.5/bin/mvn（使用 less 命令打开，例如：less /Users/Username/apache-maven-3.0.5/bin/mvn）
Step 2: Find out the below code in the script:
第 2 步：在脚本中找出以下代码：
if [ -z "$JAVACMD" ] ; then
if [ -n "$JAVA_HOME" ] ; then
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD="$JAVA_HOME/jre/sh/java"
else
JAVACMD="$JAVA_HOME/bin/java"
fi
else
JAVACMD="`which java`"
fi
fi
if [ ! -x "$JAVACMD" ] ; then
echo "Error: JAVA_HOME is not defined correctly."
echo " We cannot execute $JAVACMD"
exit 1
fi
Step3: It is happening because JAVACMDvariable was not set. So it displays the error.
第3步：这是因为JAVACMD未设置变量而发生的。所以它显示错误。
Note: To Fix it
注意：修复它
export JAVACMD=/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/bin/java
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/
Key: If you want it to be permanent open emacs .profile
关键：如果你想让它永久打开 emacs .profile
post the commands and press Ctrl-x Ctrl-c ( save-buffers-kill-terminal ).
发布命令并按 Ctrl-x Ctrl-c ( save-buffers-kill-terminal )。
回答by ishanbakshi
If you are using mac-OS , export JAVA_HOME=/usr/libexec/java_homeneed to be changed to export JAVA_HOME=$(/usr/libexec/java_home).
Steps to do this :
如果您使用的是 mac-OS ，则export JAVA_HOME=/usr/libexec/java_home需要更改为export JAVA_HOME=$(/usr/libexec/java_home). 执行此操作的步骤：
$ vim .bash_profile
export JAVA_HOME=$(/usr/libexec/java_home)
$ source .bash_profile
where /usr/libexec/java_homeis the path of your jvm
/usr/libexec/java_home你的jvm的路径在哪里
