1. download jdk-1_5_0_22-linux-i586.bin
http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase5-419410.html
2. excute jdk-1_5_0_22-linux-i586.bin
chmod 777 jdk-1_5_0_22-linux-i586.bin
./jdk-1_5_0_22-linux-i586.bin
3. set java environment
export PATH=/root/jdk1.5.0_22/bin:$PATH