ubuntu java

2.1. 从Sun站点下载jdk 6.0.4的Linux自解压文件 jdk-6u4-linux-i586.bin;

2.2. 安装配置

cd /usr/local/lib
sudo cp /home/jdk-6u4-linux-i586.bin ./
sudo chmod +x jdk-6u4-linux-i586.bin
sudo ./jdk-6u4-linux-i586.bin
执行最后一步命令后便在当前目录下多了一个“jdk1.6.0_04“的目录,里面是jdk-6u4-linux-i586.bin解压后JDK的全部文件;
由于Ununtu本身带了gij的JVM实现，所以当你在Terminal输入: "java -version"时会显示:
java version "1.5.0"
gij (GNU libgcj) version 4.2.1 (Ubuntu 4.2.1-5ubuntu5)
的相关信息。也就是系统中有两个JVM实现，而且gij JVM还被其它的Ubuntu工具或软件使用；所以这种情况下就得使用 Debian提供的“update-alternatives“工具来完成程序多版本实现的选择了:
sudo update-alternatives --display java
发现系统只列举了gij JVM；因为jdk6是通过手动解压安装的。
现在输入下面的两行命令:
sudo update-alternatives --install /usr/bin/java java /usr/local/lib/jdk1.6.0_04/bin/java 60
sudo update-alternatives --install /usr/bin/java java /usr/bin/gij-4.2 40
注意1，2行尾的60,40是优先级；现在把JDK6设为了首选；
输入: ls -l /etc/alternatives/java 发现JVM已经指向了jdk6的解压目录：
lrwxrwxrwx 1 root root 35 2008-01-25 17:55 /etc/alternatives/java -> /usr/local/lib/jdk1.6.0_04/bin/java

cd /usr/bin
sudo cp java java.bak
sudo ln -sf /etc/alternatives/java .

现在再执行:
java -version

java version "1.6.0_04"
Java(TM) SE Runtime Environment (build 1.6.0_04-b12)
Java HotSpot(TM) Client VM (build 10.0-b19, mixed mode, sharing)

若想变更JVM实现，输入：
sudo update-alternatives --config java
进行配置；

2. 3. 设置环境变量

在/etc/profile中加入如下的内容：

JAVA_HOME=/usr/local/lib/jdk1.6.0_04
JRE_HOME=/usr/local/lib/jdk1.6.0_04/jre
CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib
export JAVA_HOME JRE_HOME CLASSPATH


okey, JDK安装配置完成。


scala
Download your desired version of Scala(tgz)
Extract the package in /opt/
Edit .bashrc with the command gedit .bashrc
Export variable SCALA_HOME: export SCALA_HOME=/opt/scala-2.8.1.final
Update PATH to include SCALA binaries: export PATH=$SCALA_HOME/bin:$PATH
Save .bashrc, log out and log in
Verify the Scala installation: scala -version
Install / configure your favorite IDE

sbt
from: https://github.com/harrah/xsbt/wiki/Getting-Started-Setup
Unix

Download sbt-launch.jar and place it in ~/bin.

Create a script to run the jar, by placing this in a file called sbt in your ~/bin directory:

java -Xmx512M -jar `dirname $0`/sbt-launch.jar "$@"

Make the script executable:

$ chmod u+x ~/bin/sbt