"java.lang.IllegalStateException: No ServletContext set" while servlet deploying

Question

I'm triyng to deploy a spring-mvc webapp WAR-package on tomcat. Deploy proccess fails with following error: 'java.lang.IllegalStateException: No ServletContext set'

I guess something wrong with my configuration :(

Tomcat version: 8.5.46
Spring, spring-mvc version: 5.1.9.RELEASE
Example configuration code from spring.io: https://docs.spring.io/spring/docs/current/spring-framework-reference/web.html#mvc-servlet

My webapp initializer:

package com.jbtits.spring.mvc.webac;

import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;

public class AppInitializer implements WebApplicationInitializer {

    public void onStartup(ServletContext servletContext) throws ServletException {
        AnnotationConfigWebApplicationContext applicationContext = new AnnotationConfigWebApplicationContext();
        applicationContext.register(AppConfig.class);
        applicationContext.refresh();

        DispatcherServlet servlet = new DispatcherServlet(applicationContext);
        ServletRegistration.Dynamic registration = servletContext.addServlet("webac", servlet);
        registration.setLoadOnStartup(1);
        registration.addMapping("/");
    }
}

My webapp configuration:

package com.jbtits.spring.mvc.webac;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

@Configuration
@EnableWebMvc 
@ComponentScan("com.jbtits.spring.mvc.webac")
public class AppConfig extends WebMvcConfigurationSupport {
}

Thats it, only two beans.

Tomcat failure output:

02-Oct-2019 18:02:52.971 WARNING [http-nio-8081-exec-84] org.springframework.context.support.AbstractApplicationContext.refresh Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'resourceHandlerMapping' defined in org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.HandlerMapping]: Factory method 'resourceHandlerMapping' threw exception; nested exception is java.lang.IllegalStateException: No ServletContext set

Don't extend WebMvcConfigurationSupport, either implement WebMvcConfigurere or if on older version extend WebMvcConfigurerAdapter. — M. Deinum
– M. Deinum, Commented Oct 3, 2019 at 8:56
Instead of WebApplicationInitializer, try extending AbstractAnnotationConfigDispatcherServletInitializer and override "getServletMappings", "getRootConfigClasses" and "getServletConfigClasses". — Maheshkumar
– Maheshkumar, Commented Oct 3, 2019 at 9:07
Same behaviour, cause org.springframework.web.context.support.ServletContextAwareProcessor can't set ServletContext (it's not existing at this time moment). This PostProcessor uses in both vaiarts — Nickolay Zaytsev
– Nickolay Zaytsev, Commented Oct 3, 2019 at 9:10

Nickolay Zaytsev · Accepted Answer · 2019-10-03 09:00:52Z

2

I found the solution: no need to call applicationContext.refresh(); in the org.springframework.web.WebApplicationInitializer#onStartup, cause it will be automaticaly called in the method org.springframework.web.servlet.FrameworkServlet#configureAndRefreshWebApplicationContext while servlet loading in the servlet container.

But I use example from spring.io docs: https://docs.spring.io/spring/docs/current/spring-framework-reference/web.html#mvc-servlet . Why they use it that way? proof

answered Oct 3, 2019 at 9:00

Nickolay Zaytsev

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