Every time I modify the JAVA class file, the effect of the class file modification cannot be seen on the JSP page. Restart Tomcat to see the modified effect.
project --> Build Automatically
This is set, it is nothing more than tomcat restarts itself, you do not need to manually restart, in general, you have to restart
The most effective is to use debug operation, set breakpoints to debug the program! At the same time, you can also use System.out.print() to see the execution effect of the program (not as convenient as debug)!