How to Prevent Vaadin from Taking Over All URL Patterns in Spring MVC

How can I configure Vaadin to avoid intercepting all URL patterns in a Spring MVC application?

// In your Spring configuration, set the Vaadin servlet mapping:
@Override
protected void configureDispatcherServlet(DispatcherServlet servlet) {
    servlet.setUrlMappings(new String[] {"/app/*", "/vaadin/*"});
}
// Make sure Vaadin doesn't capture all URLs by restricting its route settings.

To ensure Vaadin does not monopolize the URL patterns in a Spring MVC application, you must configure both frameworks appropriately. This involves defining specific URL mappings to keep the routes of each framework from conflicting with one another.

import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@EnableWebMvc
public class WebMvcConfig implements WebMvcConfigurer {
    @Override
    public void addServletMappings(ServletRegistrationBean<VaadinServlet> registration) {
        registration.addUrlMappings("/vaadin/*");
    }
}

Causes

• Vaadin's default servlet configuration captures all requests, which can clash with Spring MVC’s routing.
• Improper servlet mapping in the Spring application context may lead to unintended behavior.
• Default Vaadin routes may not be tailored for integration with Spring MVC.

Solutions

• Explicitly define URL patterns for the Vaadin servlet in the Spring configuration to limit its scope.
• Use Spring's `@RequestMapping` annotations to manage URL handling within your controllers.
• Configure Vaadin to work with Spring's DispatcherServlet instead of deploying as a standard servlet.

Mistake: Failing to set specific URL patterns for the Vaadin servlet, causing it to intercept all requests.

Solution: Always map the Vaadin servlet to a specific path, like /vaadin/*, to avoid it capturing unintended URLs.

Mistake: Not using Spring MVC's request handling methods leading to conflicts in route management.

Solution: Ensure you utilize Spring's @RequestMapping to clearly define routes.