OpenJDKのyum install と alternatives による java切替え

参考url : http://openjdk.java.net/install/

$ su -
# yum install java-1.8.0-openjdk
    :
# which java
/usr/bin/java
[endo@cent6 java]$ java -version
openjdk version "1.8.0_91"
OpenJDK Runtime Environment (build 1.8.0_91-b14)
OpenJDK 64-Bit Server VM (build 25.91-b14, mixed mode)

# alternatives --config java

There are 3 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
   1           /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java
   2           /usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/java
*+ 3           /usr/lib/jvm/jre-1.8.0-openjdk.x86_64/bin/java

Enter to keep the current selection[+], or type selection number:

どうやら「alternatives --install」は、yum ?が行っているみたい。

# alternatives --install /usr/bin/java java /usr/lib/jvm/jre-1.8.0-openjdk.x86_64/bin/java 2

またJAVA_HOMEは次のようにしておけば、よい気がします

export JAVA_HOME='/usr/lib/jvm/java'