DevTools simple principle of heat springboot deployment of analytic

IDEA New springboot select DevTools

　　springboot-devtools module enables hot deployment, add the class. Add method, modify the configuration file, modify the page, etc., can achieve hot deployment.

　　The principle is to restart the project, but much faster than the manual restart, the underlying principle is the use of two ClassLoder, which does not change a class (third-party jar package) ClassLoader loaded, another ClassLoader to load the class will change.