How to disable ErrorPageFilter in Vaadin Spring boot application when deployed as war?

I am trying to solve a problem with Vaadin 24.9.10 Spring Boot 3.5.11 application deployed as war file for tomcat 10 on my server.

There are a lot of error log messages with varying request paths about ErrorPageFilter, which can not forward to error page since response has already been commited:

ERROR 1 --- [nio-8080-exec-9] o.s.b.w.servlet.support.ErrorPageFilter : Cannot forward to error page for request [/] as the response has already been committed. As a result, the response may have the wrong status code. If your application is running on WebSphere Application Server you may be able to resolve this problem by setting com.ibm.ws.webcontainer.invokeFlushAfterService to false

This is happening only when application is deployed as war file to a tomcat container on the server. No error logs when running locally. I want to remove that logs when deployed to server (the log is not needed since I am using only default Vaadin views and not interfering with requests/responses or using custom error page paths or handling request/responses errors on spring level).

ErrorPageFilter bean is probably created by default by Vaadin/Spring boot when deployed as war file or by some default configuration. From ErrorPageFilter docs:

A Servlet Filter that provides an ErrorPageRegistry for non-embedded applications (i.e. deployed WAR files). It registers error pages and handles application errors by filtering requests and forwarding to the error pages instead of letting the server handle them. Error pages are a feature of the servlet spec but there is no Java API for registering them in the spec. This filter works around that by accepting error page registrations from Spring Boot's ErrorPageRegistrar (any beans of that type in the context will be applied to this server)

There is also an outdated unanswered post on vaadin forum referencing same error log, but from my understanding, in different context.

There is also an outdated answer on stack overflow site, which does not work for today's framework versions or perhaps there is an extra, which needs to be done (configured) to make it work:

@Configuration
public class AppInitializer implements WebApplicationInitializer {

    @Bean
    public ErrorPageFilter errorPageFilter() {
        return new ErrorPageFilter();
    }

    @Bean
    public FilterRegistrationBean disableSpringBootErrorFilter(ErrorPageFilter filter) {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(filter);
        filterRegistrationBean.setEnabled(false);
        return filterRegistrationBean;
    }
}

In this case, I get an exception: The bean 'errorPageFilter', defined in org.springframework.boot.web.servlet.support.ErrorPageFilterConfiguration, could not be registered. A bean with that name has already been defined in class path resource

Using @ConditionalOnBean(ErrorPageFilter.class) does not help (method is not called).

I am also using Vaadin's ErrorHandler to catch UI exceptions if it is relevant:

@Component
public class VaadinErrorHandler implements ErrorHandler {

    @Override
    public void error(final ErrorEvent event) {
        ...
    }
}

Lastly, this is my class with @SpringBootApplication annotation:

@SpringBootApplication
@Theme(value = "myapp")
@PWA(name = "XXX", shortName = "XXX", iconPath = "icons/XXX.png", offlinePath = "XXX.html")
@Push(value = PushMode.MANUAL)
@EnableAsync
@EnableScheduling
public class Application extends SpringBootServletInitializer implements AppShellConfigurator {

    // dev only
    public static void main(final String[] args) throws Exception {
        new SpringApplicationBuilder(Application.class)
                .listeners(new DatabasePropertiesSetup())
                .run(args);
    }

    // when deployed to servlet container
    @Override
    protected SpringApplicationBuilder configure(final SpringApplicationBuilder application) {
        return application.listeners(new DatabasePropertiesSetup())
                .sources(Application.class);
    }

    @Override
    public void onStartup(final ServletContext servletContext) throws ServletException {
        val sessionCookieConfig = servletContext.getSessionCookieConfig();
        servletContext.setSessionTimeout(60);
        sessionCookieConfig.setHttpOnly(true);
        sessionCookieConfig.setSecure(true);
        sessionCookieConfig.setName("XXX");
        super.onStartup(servletContext);
    }

    @Override
    public void configurePage(final AppShellSettings settings) {
        settings.addFavIcon("icon", "icons/XXX.png", "17x17");
    }
}

posted 3 months ago

CC BY-NC 4.0

3mo ago

MarekChr‭

31 reputation 1 1 5 1