The JSP page calls a newly written or modified method. Although the function is normal, compilation fails.

Problem description: I wrote a Java method in myeclipse + Tomcat or modified a method and called this method on the JSP page. Although the function has no problem, the compilation fails, what's the problem?

A: Actually, when you modify or add a new method, but Tomcat executes it on the webpage, the class file is still in the old version before the modification, so no new method is identified.

The solution is to re-clean the entire project to generate a new class file. The specific method is to select project --> clean under the myeclipse menu to solve the problem. Try again and again.