如何将RHEL5.5的Java升级至1.5?

下载jdk-1_5_0_22-linux-amd64-rpm.bin

[root@localhost ~]# chmod 775 jdk-1_5_0_22-linux-amd64-rpm.bin
[root@localhost ~]# ./jdk-1_5_0_22-linux-amd64-rpm.bin

vi /etc/profile.d/java.sh 加入下述两行:
export JAVA_HOME=/usr/java/jdk1.5.0_22
export PATH=$JAVA_HOME/bin:$PATH

[root@localhost ~]# source /etc/profile.d/java.sh

[root@localhost ~]# alternatives --install /usr/bin/java java /usr/java/jdk1.5.0_22/bin/java 2

运行下述命令，并选择2：
[root@localhost ~]# alternatives --config java