open jdk

http://rednaxelafx.iteye.com/blog/1549577

https://www.jianshu.com/p/f98c3acd8df8

http://download.java.net/openjdk/jdk6/

http://java-mzd.iteye.com/blog/838514

http://chuna2.787528.xyz/qiuting/p/5308877.html