未正确设置的JAVA_HOME。如何重置它?

When I try to run mvn (Apache Maven, that is), I keep getting error "JAVA_HOME" not set.

当我尝试运行mvn(即Apache Maven)时，我不断地得到错误“JAVA_HOME”而没有设置。

I follow the instructions to set the JAVA_HOME variable as follow; In the terminal:

我按照说明设置JAVA_HOME变量如下所示;终端:

user@localhost$export JAVA_HOME=/home/user/jdk1.7.0_02/bin/java

user@localhost$export PATH=$PATH:/home/usr/jdk1.7.0_02/bin

That looks correct, right? Then how come I still getting the incorrect JAVA_HOME error?

这是正确的,对吗?那么为什么我仍然得到不正确的JAVA_HOME错误呢?

5 个解决方案

#1

JAVA_HOME typically should only include the folder that contains the bin folder.

JAVA_HOME通常只应该包含包含bin文件夹的文件夹。

So in your case

所以在你的情况下

export JAVA_HOME=/home/user/jdk1.7.0_02/

出口JAVA_HOME = / home / user / jdk1.7.0_02 /

export PATH=$PATH:$JAVA_HOME/bin

导出路径= $路径:$ JAVA_HOME / bin

In addition for finding the location of your java_home you can follow this command

除了找到java_home的位置，还可以遵循以下命令

which java

(This will return the path of the current java binary. Over here its /usr/bin/java)

(这将返回当前java二进制文件的路径。这里/usr/bin/java)

ls -alh /usr/bin/java

ls -alh /usr/bin/java

( This will return true path to the symbolic link. Over here its /etc/alternatives/java.

(这将返回到符号链接的真正路径。在这里其/etc/alternatives / java。

ls -alh /etc/alternatives/java

ls -alh /etc/alternatives / java

( This will return true path to this symbolic link which is actual JAVA HOME path)

(这将返回到这个符号链接的真正路径，即实际的JAVA主路径)

#2

Goto Terminal and open either of the following files using an editor of your choice (vim, nano, etc):

使用您选择的编辑器(vim、nano等)打开以下任一文件:
```
# nano /etc/profile
```
(or)

(或)
```
# nano /root/.bash_profile
```
(Instead of root you can also change your normal username.)

(你也可以更改你的普通用户名而不是root用户名。)

Now run the following commands:

现在运行以下命令:

# export JAVA_HOME="/opt/jdk1.6.0"
# export PATH="/opt/jdk1.6.0/bin:$PATH"

Logout and logon the system , now check the java version in your terminal using the following command:

登出和登入系统，现在使用以下命令检查您的终端中的java版本:
```
# java -version
```
The output should look similar to this:

输出应类似如下:
```
# java -version
java version “1.6.0″
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Client VM (build 1.6.0-b105, mixed mode, sharing)
```

#3

No... $JAVA_HOME must point to /home/user/jdk1.7.0_02/

不…$JAVA_HOME必须指向/home/user/jdk1.7.0_02/。

To prevent errors like "/home/user" versus "/home/usr", $PATH should be "$PATH:$JAVA_HOME/bin"

为了防止像“/home/user”和“/home/usr”这样的错误，$PATH应该是“$PATH:$JAVA_HOME/bin”

And I recommend using a native package (yum, apt-get, etc).

我建议使用本机包(yum、apt-get等)。

#4

Because that's not what you set JAVA_HOME to.

因为这不是我们设置JAVA_HOME的目的。

http://maven.apache.org/download.html

Make sure that JAVA_HOME is set to the location of your JDK, e.g. export JAVA_HOME=/usr/java/jdk1.5.0_02 and that $JAVA_HOME/bin is in your PATH environment variable.

确保将JAVA_HOME设置为JDK的位置，例如，export JAVA_HOME=/usr/java/jdk1.5.0_02，并且$JAVA_HOME/bin位于PATH环境变量中。

#5

You could put the following in your .bashrc, then it should be correct even if you change to a different java.

您可以在.bashrc中放入以下内容，即使您更改为另一个java，它也应该是正确的。

a=`realpath /usr/bin/java`;
export JAVA_HOME="${a%/bin/java}"

#1