设置 JAVA_HOME 和 JRE_HOME 路径
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Setting JAVA_HOME and JRE_HOME path
提问by Programmer
I have been allocated a Linux box in which has java available
我被分配了一个 Linux 机器，其中有可用的 Java
# java -version
java version "1.7.0_09-icedtea"
OpenJDK Runtime Environment (rhel-2.3.4.1.el6_3-x86_64)
OpenJDK 64-Bit Server VM (build 23.2-b09, mixed mode)
# ls -l /usr/bin/java
lrwxrwxrwx. 1 root root 22 Feb 8 2013 /usr/bin/java -> /etc/alternatives/java
I am new to Java and not sure if JRE is installed in ths box but based upon search:
我是 Java 新手，不确定 JRE 是否安装在 ths 框中，但基于搜索：
# rpm -q jre
package jre is not installed
# find / -iname java -print 2>/dev/null
/usr/lib/java
/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.9.x86_64/jre/bin/java
/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/bin/java
/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre/bin/java
/usr/bin/java
/usr/share/java
/var/lib/alternatives/java
/etc/alternatives/java
/etc/java
/etc/pki/java
But
但
# echo $JAVA_HOME
# echo $JRE_HOME
So is JAVA is installed and JRE also - am I correct but what value I should set for JAVA_HOME and JRE_HOME env variables?
那么是否安装了 JAVA 和 JRE - 我是否正确但是我应该为 JAVA_HOME 和 JRE_HOME 环境变量设置什么值？
采纳答案by Bhargav Modi
firstly try to get out of root user if possible than after that change below in your ~/.bash_profile
如果可能的话，首先尝试退出 root 用户，而不是在您的以下更改之后 ~/.bash_profile
JAVA_HOME=/usr/java/<Java version 7 jdk>; export JAVA_HOME // you can also try JAVA_HOME=/usr/java/jdk 7 version/bin/java
PATH=$JAVA_HOME/bin:$PATH; export PATH
save it and then
保存它然后
now source ~/.bashrc
现在 source ~/.bashrc
after that try
在那之后尝试
echo $JAVA_HOMEit will produce the expected result.
echo $JAVA_HOME它将产生预期的结果。
回答by Aakash
set $JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.9.x86_64
设置 $JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.9.x86_64
set $JRE_HOME=/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre
设置 $JRE_HOME=/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre
回答by Simpson
I am not sure about any other version of Linux, but in Ubuntu you need open home/.bashrc and add in the end of file
我不确定任何其他版本的 Linux，但在 Ubuntu 中，您需要打开 home/.bashrc 并添加到文件末尾
export JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.9.x86_64
export PATH=$JAVA_HOME/bin:$PATH
after that, save file and relogin.
之后，保存文件并重新登录。
EDIT
编辑
java will know where is jre by JAVA_HOME.
java 将通过 JAVA_HOME 知道 jre 在哪里。
回答by KernelKoder
Based on the output you have posted, i can draw the following conclusions:
根据您发布的输出，我可以得出以下结论：
- Based on the fact that
java -versionworks on your machine, you have the JRE installed. - The 'echo' statements do not produce any output as you have not set the environment variables for them.
- 基于在
java -version您的机器上运行的事实，您已经安装了 JRE。 - 'echo' 语句不会产生任何输出，因为您没有为它们设置环境变量。
On a side note, if you are planning on doing Java Development, then you need the JDKinstalled. The JRE comes as a subset of the JDK once installed
附带说明一下，如果您打算进行 Java 开发，那么您需要安装JDK。一旦安装，JRE 就作为 JDK 的一个子集出现
回答by Mohan Raj
JAVA_HOME should be set as parent folder of the java installed path
JAVA_HOME 应该设置为java安装路径的父文件夹
and JRE_HOME should be /jre
和 JRE_HOME 应该是 /jre
