【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 
在jdk安装的根目录下自带的有源码 jdk-11.0.5\lib\src.zip
点击idea菜单File --> Project Structure --> SDKs ，修改JDK home path为jdk的安装目录
点击idea菜单File --> Setting --> Build,Execution,Deployment --> Debugger --> Stepping
把Do not step into the classes中的ajva.*，javax.*取消勾选
来源：oschina
链接：https://my.oschina.net/u/4108547/blog/3141725