Oracle 文档

https://docs.oracle.com/javase/tutorial/essential/concurrency/index.html
Oracle文档 同步/死锁相关内容

https://docs.oracle.com/javase/specs/jvms/se8/html/index.html
The Java® Virtual Machine 特性

https://github.com/alibaba/fastjson
阿里巴巴fatjson

https://github.com/crazyFeng
张锋 github

https://www.cnblogs.com/hihtml5/p/8217062.html
VirtualBox安装centos7

https://github.com/h5bp/server-configs-nginx
nginx配置 github

1）国外：https://discuss.elastic.co/
2）国内：http://elasticsearch.cn/
ES遇到问题怎么办？

http://openjdk.java.net/
OpenJDK