//Java虚拟机文档 

https://docs.oracle.com/javase/8/docs/technotes/guides/vm/gctuning/https://docs.oracle.com/javase/8/docs/technotes/guides/vm/gctuning/

// JavaSE 规范文档和JVM规范文档

Java SE Specificationshttps://docs.oracle.com/javase/specs/index.html

//Java api文档

Java Platform SE 8 https://docs.oracle.com/javase/8/docs/api/

//SpringBoot文档

Spring Boot Reference Documentationhttps://docs.spring.io/spring-boot/docs/2.3.12.RELEASE/reference/htmlsingle/

也可以这样按路径找，自己选择版本

Index of /spring-boot/docshttps://docs.spring.io/spring-boot/docs/ 

//SpringCloud文档

Spring Cloudhttps://docs.spring.io/spring-cloud/docs/Hoxton.SR12/reference/htmlsingle/ 

也可以按路径找，自由选择版本 

Index of /spring-cloud/docshttps://docs.spring.io/spring-cloud/docs/