BAEL-86: Refactored WebInitializer and added MultipartResolver.

spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/WebApplicationInitializer.java

@@ -0,0 +1,30 @@
+package com.baeldung.spring.dispatcher.servlet;
+
+import org.springframework.web.context.ContextLoaderListener;
+import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
+import org.springframework.web.servlet.DispatcherServlet;
+
+import javax.servlet.MultipartConfigElement;
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRegistration;
+
+public class WebApplicationInitializer implements org.springframework.web.WebApplicationInitializer {
+    @Override
+    public void onStartup(ServletContext servletContext) throws ServletException {
+        AnnotationConfigWebApplicationContext rootContext =
+          new AnnotationConfigWebApplicationContext();
+        rootContext.register(RootConfiguration.class);
+        servletContext.addListener(new ContextLoaderListener(rootContext));
+        AnnotationConfigWebApplicationContext webContext =
+          new AnnotationConfigWebApplicationContext();
+        webContext.register(WebConfiguration.class);
+        webContext.scan("com.baeldung.spring.dispatcher.servlet.web");
+        ServletRegistration.Dynamic servlet = servletContext.addServlet("dispatcher",
+          new DispatcherServlet(webContext));
+        servlet.addMapping("/*");
+        MultipartConfigElement multipartConfigElement =
+          new MultipartConfigElement("/tmp");
+        servlet.setMultipartConfig(multipartConfigElement);
+    }
+}

spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/WebConfiguration.java

@@ -6,6 +6,8 @@ import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.support.ResourceBundleMessageSource;
 import org.springframework.ui.context.support.ResourceBundleThemeSource;
+import org.springframework.web.multipart.MultipartResolver;
+import org.springframework.web.multipart.support.StandardServletMultipartResolver;
 import org.springframework.web.servlet.LocaleResolver;
 import org.springframework.web.servlet.ThemeResolver;
 import org.springframework.web.servlet.config.annotation.EnableWebMvc;
@@ -111,4 +113,9 @@ public class WebConfiguration extends WebMvcConfigurerAdapter {
         themeChangeInterceptor.setParamName("theme");
         return themeChangeInterceptor;
     }
+
+    @Bean
+    public MultipartResolver multipartResolver() {
+        return new StandardServletMultipartResolver();
+    }
 }

spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/WebInitializer.java

@@ -1,28 +0,0 @@
-package com.baeldung.spring.dispatcher.servlet;
-
-import com.baeldung.spring.dispatcher.servlet.web.filters.RequestLoggingFilter;
-import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
-
-import javax.servlet.Filter;
-
-public class WebInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
-    @Override
-    protected Class<?>[] getRootConfigClasses() {
-        return new Class<?>[]{RootConfiguration.class};
-    }
-
-    @Override
-    protected Class<?>[] getServletConfigClasses() {
-        return new Class<?>[]{WebConfiguration.class};
-    }
-
-    @Override
-    protected String[] getServletMappings() {
-        return new String[]{"/*"};
-    }
-
-    @Override
-    protected Filter[] getServletFilters() {
-        return new Filter[]{new RequestLoggingFilter()};
-    }
-}