由于Ubuntu11.04默认安装的是open-JDK,但有的东西只支持sun-jdk.所以这里需要更换.大概如下命令:

1、 更换数据源

sudo add-apt-repository "deb http://archive.canonical.com/ 

lucid partner" 

2、 更新数据源

sudo apt-get update 

3、安装sun-jdk

sudo apt-get install sun-java6-jdk sun-java6-plugin 

4、执行sudo gedit /etc/environment，添加配置

(/usr/lib/jvm/java-6-sun实际上是个链接指向java-6-sun-1.6.0.26文件夹)

PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/lib/jvm/java-6-sun-1.6.0.26/bin”
CLASSPATH=”. :/usr/lib/jvm/java-6-sun-1.6.0.26/lib”
JAVA_HOME=” /usr/lib/jvm/java-6-sun-1.6.0.26/”

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-6-sun-1.6.0.26/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/java-6-sun-1.6.0.26/bin/javac 300

5、 查看系统默认安装的java配置首选项，敲入数字做选择

sudo update-alternatives --config java

6、要使配置生效必须重启机器或者在命令行输入

. /etc/environment

7、 测试

java -version