Using Java in Debian

Using Java in Debian

要安装个solr的环境调试，需要安装java，我的虚拟机使用的是debian，搜索了好多还是sun时代的写的blog。最后在debian的官网找到如下：

https://wiki.debian.org/Java/

To install the default JRE (Java Runtime Environment) on your system, run:

  apt-get install default-jre

To install the default JDK (Java Development Kit) on your system, run:

  apt-get install default-jdk

安装完成后
#java -version
java version "1.6.0_31"
OpenJDK Runtime Environment (IcedTea6 1.13.3) (6b31-1.13.3-1~deb6u1)
OpenJDK 64-Bit Server VM (build 23.25-b01, mixed mode)

升级版本

到官网下载linux版java
解压
tar xvf java-版本.tar.gz

解压出来的文件夹复制到

  /usr/lib/jvm/  #（64位/usr/lib64/jvm/）

  update-alternatives --install /usr/bin/java java /usr/lib/jvm/你的版本/bin/java 1065

1065表示优先级
检测java安装的配置

    update-alternatives --config java

There are 2 choices for the alternative java (providing /usr/bin/java).

Selection Path Priority Status

• 0 /usr/lib/jvm/jdk1.8.0_25/bin/java 1065 auto mode
  1 /usr/lib/jvm/java-6-openjdk/jre/bin/java 1061 manual mode
  2 /usr/lib/jvm/jdk1.8.0_25/bin/java 1065 manual mode

java -version

java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)

将安装源添加上网易的源 http://mirrors.163.com/.help/debian.html

以Squeeze为例, 编辑/etc/apt/sources.list文件, 在文件最前面添加以下条目(操作前请做好相应备份)

   deb http://mirrors.163.com/debian/ squeeze main non-free contrib
   deb http://mirrors.163.com/debian/ squeeze-proposed-updates main non-free contrib
   deb-src http://mirrors.163.com/debian/ squeeze main non-free contrib
   deb-src http://mirrors.163.com/debian/ squeeze-proposed-updates main non-free contrib