先卸载服务器自带的jdk软件包 # java -version #查看服务器是否安装过jdk java version "1.6.0_17" OpenJDK Runtime Environment (IcedTea6 1.7.4) (rhel-1.21.b17.el6-i386) OpenJDK Client VM (build 14.0-b16, mixed mode) # rpm -qa |grep gcj #查看服务器安装的jdk软件包信息 libgcj-4.4.4-13.el6.i686