Fedora OpenJDK设置JAVA_HOME [英] Fedora OpenJDK Set JAVA_HOME

问题描述

我正在使用Fedora（实际上是Pidora，因为我试图在raspberrypi的集群上设置hadoop）。我使用ansible在所有节点上安装了oopenjdk。但是，当我尝试设置JAVA_HOME环境变量时，我非常困惑，看着 / usr / lib / jvm 的文件夹：

  [root @ datafireball1 jvm]＃ls 
 java-1.7.0-openjdk-1.7.0.60-2.4.7.0.fc20.arm jre jre- 1.7.0 jre-1.7.0-openjdk jre-1.7.0-openjdk-1.7.0.60-2.4.7.0.fc20.arm jre-openjdk 
 [root @ datafireball1 jvm]＃ls -alth 
总共80K 
 drwxr-xr-x 3 root root 4.0K Jun 7 21:07。 
 lrwxrwxrwx 1 root root 35 Jun 7 21:07 jre-1.7.0-openjdk  - > /etc/alternatives/jre_1.7.0_openjdk 
 lrwxrwxrwx 1 root root 27 Jun 7 21:07 jre-1.7.0  - > /etc/alternatives/jre_1.7.0 
 lrwxrwxrwx 1 root root 29 Jun 7 21:07 jre-openjdk  - > / etc / alternatives / jre_openjdk 
 lrwxrwxrwx 1 root root 21 Jun 7 21:07 jre  - > / etc / alternatives / jre 
 lrwxrwxrwx 1 root root 48 Jun 7 21:07 jre-1.7.0-openjdk-1.7.0.60-2.4.7.0.fc20.arm  - > java-1.7.0-openjdk-1.7.0.60-2.4.7.0.fc20.arm / jre 
 drwxr-xr-x 4 root root 4.0K Jun 7 21:06 java-1.7.0-openjdk-1.7。为什么有这么多的Java文件夹，哪个文件夹应该是什么？我用作Java家吗？ 
  [root @ datafireball1 bin]＃哪些java 
 / usr / bin / java 
 [root @ datafireball1 bin]＃ls -alSh / usr / bin / | grep java 
 lrwxrwxrwx 1 root root 22 Jun 7 21:07 java  - > / etc / alternatives / java 
  
谢谢！
解决方案
您可以在 .bashrc 文件中添加：
 
 
 export JAVA_HOME = $（readlink -f / usr / bin / java | seds：bin / java ::）
 
 
，当您更新软件包时，它将动态更改。
 
I am using Fedora(actually Pidora since I am trying to set up hadoop on a cluster of raspberrypi). I installed oopenjdk on all of the nodes using ansible. However, when I tried to set up the JAVA_HOME environment variable, I got really confused looking at the folder of /usr/lib/jvm:
[root@datafireball1 jvm]# ls
java-1.7.0-openjdk-1.7.0.60-2.4.7.0.fc20.arm  jre  jre-1.7.0  jre-1.7.0-openjdk  jre-1.7.0-openjdk-1.7.0.60-2.4.7.0.fc20.arm  jre-openjdk
[root@datafireball1 jvm]# ls -alth
total 80K
drwxr-xr-x   3 root root 4.0K Jun  7 21:07 .
lrwxrwxrwx   1 root root   35 Jun  7 21:07 jre-1.7.0-openjdk -> /etc/alternatives/jre_1.7.0_openjdk
lrwxrwxrwx   1 root root   27 Jun  7 21:07 jre-1.7.0 -> /etc/alternatives/jre_1.7.0
lrwxrwxrwx   1 root root   29 Jun  7 21:07 jre-openjdk -> /etc/alternatives/jre_openjdk
lrwxrwxrwx   1 root root   21 Jun  7 21:07 jre -> /etc/alternatives/jre
lrwxrwxrwx   1 root root   48 Jun  7 21:07 jre-1.7.0-openjdk-1.7.0.60-2.4.7.0.fc20.arm -> java-1.7.0-openjdk-1.7.0.60-2.4.7.0.fc20.arm/jre
drwxr-xr-x   4 root root 4.0K Jun  7 21:06 java-1.7.0-openjdk-1.7.0.60-2.4.7.0.fc20.arm
Why there are so many folders for Java and which folder should I use as the Java home? 
[root@datafireball1 bin]# which java
/usr/bin/java
[root@datafireball1 bin]# ls -alSh /usr/bin/ | grep java
lrwxrwxrwx  1 root root      22 Jun  7 21:07 java -> /etc/alternatives/java
Thanks!
解决方案
You can add in your .bashrc file:

  
export JAVA_HOME=$(readlink -f /usr/bin/java | sed "s:bin/java::")
and it will dynamically change when you update your packages.

                        
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