How to solve the issue of prehandler not executing in SpringMVC.

There are several possible reasons and solutions for the preHandle method of the HandlerInterceptor not being executed in SpringMVC.

1. The interceptor configuration is incorrect: First, verify that the interceptor configuration is correct. It must be configured in the SpringMVC configuration file and the interceptor must extend the HandlerInterceptor interface. Make sure that the interceptor configuration in the configuration file is correct and error-free.
2. Interceptor order issue: If there are multiple interceptors, it may be the order of the interceptors that causes the preHandle method not to execute. When configuring multiple interceptors, it is important to pay attention to the order of the interceptors to ensure that the preHandle method is executed in the correct sequence.
3. Request path matching issue: The preHandle method of the interceptor will only be executed when the request path matches the path configured in the interceptor. Please ensure that the request path matches the path configured in the interceptor.
4. Interceptor release issue: If the preHandle method of the interceptor returns false, it means the interceptor does not pass and will not continue to execute subsequent interceptors and handlers. Please check if the preHandle method of the interceptor correctly returns true.
5. Other possible solutions include restarting the server, clearing the cache, and recompiling and running the project if the methods mentioned above do not resolve the issue.

If the problem still cannot be resolved, it is recommended to debug the specific execution process to locate the problem.