Convert web.xml to java config in Spring Boot

Question

I'm currently trying to move my project from Java EE to Spring Boot project. However, I've been stuck and confused to replacing the web.xml in java config.

I tried to replaced it, but it is not working. The project web.xml file contains some filters and servlet. The details of web.xml file are as below :

<servlet>
        <servlet-name>robinTest</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>robinTest</servlet-name>
        <url-pattern>/secureServices/ </url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>robinTest</servlet-name>
        <url-pattern>/simple/ </url-pattern>
    </servlet-mapping>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            classpath:applicationContext.xml
            classpath:application-context-1.xml
            classpath:application-context-2.xml
        </param-value>
    </context-param>


    <filter>
        <filter-name>robinTestFilter</filter-name>
        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
        <init-param>
            <param-name>targetBeanName</param-name>
            <param-value>robinTestFilter</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>robinTestFilter</filter-name>
        <url-pattern>/</url-pattern>
    </filter-mapping>

    <filter>
        <filter-name>OpenSession Filter</filter-name>
        <filter-class>org.springframework.orm.hibernate5.support.OpenSessionInViewFilter</filter-class>
        <init-param>
            <param-name>singleSession</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>sessionFactoryBeanName</param-name>
            <param-value>sessionFactory</param-value>
        </init-param>
        <init-param>
            <param-name>flushMode</param-name>
            <param-value>COMMIT</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>OpenSession Filter</filter-name>
        <url-pattern>/</url-pattern>
    </filter-mapping>

I already replace the applicationContext.xml, application-context-1.xml and application-context-2.xml files in JavaConfig file but i am not sure, how would i replace the servlet, listener and filter in java config files.

I tried to replace it but it is not working. The sample code are below :

import java.util.HashMap;
import java.util.Map;

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

import org.springframework.context.annotation.Configuration;
import org.springframework.orm.hibernate5.support.OpenSessionInViewFilter;
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.ContextLoaderListener;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.filter.DelegatingFilterProxy;
import org.springframework.web.servlet.DispatcherServlet;

@Configuration
public class AppInitializer implements WebApplicationInitializer {

    @Override
    public void onStartup(ServletContext container) throws ServletException {
        AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();

        context.scan("org.robin.test");
        //  container.se
        container.addListener(new ContextLoaderListener(context));

        ServletRegistration.Dynamic dispatcher = container.addServlet("robinTest", new DispatcherServlet(context));
        dispatcher.setLoadOnStartup(2);
        dispatcher.addMapping("/simple/");
        dispatcher.addMapping("/secureServices/");

        FilterRegistration.Dynamic filter = container.addFilter("robinTestFilter", DelegatingFilterProxy.class);
        filter.setInitParameter("targetBeanName", "robinTestFilter");
        filter.addMappingForUrlPatterns(null, true, "/*");

        FilterRegistration.Dynamic filterSession = container.addFilter("OpenSession Filter", OpenSessionInViewFilter.class);
        Map<String, String> filterMap=new HashMap<>();
        filterMap.put("singleSession", "true");
        filterMap.put("sessionFactoryBeanName", "sessionFactory");
        filterMap.put("flushMode", "COMMIT");
        filterSession.setInitParameters(filterMap);
        filterSession.addMappingForUrlPatterns(null, true, "/*");
    }
}

Help me out to rid off this problem so that i can focus on other works.

Thanks in advance.

Answer 1

I think you need to extend WebMvcConfigurer (apidoc) or WebMvcConfigurerAdapter to hook-up your pre-existing classes. Don't implement WebApplicationInitializer, which you are doing above.

You don't need to create any ApplicationContext instances yourself, like you do above