Merge pull request #45007 from dmytrodanilenkov

* pr/45007-squash:
  Polish "Add missing attributes to ServletRegistration annotation"
  Add missing attributes to ServletRegistration annotation

Closes gh-45007

Author: mhalbritter

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/servlet/ServletContextInitializerBeans.java

@@ -65,6 +65,7 @@
  * @author Brian Clozel
  * @author Moritz Halbritter
  * @author Daeho Kwon
+ * @author Dmytro Danilenkov
  * @since 1.4.0
  */
 public class ServletContextInitializerBeans extends AbstractCollection<ServletContextInitializer> {
@@ -320,6 +321,10 @@ private void configureFromAnnotation(ServletRegistrationBean<Servlet> bean, Serv
 			bean.setIgnoreRegistrationFailure(registration.ignoreRegistrationFailure());
 			bean.setLoadOnStartup(registration.loadOnStartup());
 			bean.setUrlMappings(Arrays.asList(registration.urlMappings()));
+			for (WebInitParam param : registration.initParameters()) {
+				bean.addInitParameter(param.name(), param.value());
+			}
+			bean.setMultipartConfig(new MultipartConfigElement(registration.multipartConfig()));
 		}
 
 	}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/servlet/ServletRegistration.java

@@ -23,6 +23,8 @@
 import java.lang.annotation.Target;
 
 import jakarta.servlet.Servlet;
+import jakarta.servlet.annotation.MultipartConfig;
+import jakarta.servlet.annotation.WebInitParam;
 
 import org.springframework.core.Ordered;
 import org.springframework.core.annotation.AliasFor;
@@ -33,6 +35,7 @@
  * annotation-based alternative to {@link ServletRegistrationBean}.
  *
  * @author Moritz Halbritter
+ * @author Dmytro Danilenkov
  * @since 3.5.0
  * @see ServletRegistrationBean
  */
@@ -87,4 +90,16 @@
 	 */
 	int loadOnStartup() default -1;
 
+	/**
+	 * Init parameters to be used with the servlet.
+	 * @return the init parameters
+	 */
+	WebInitParam[] initParameters() default {};
+
+	/**
+	 * The multipart configuration.
+	 * @return the multipart configuration
+	 */
+	MultipartConfig multipartConfig() default @MultipartConfig;
+
 }

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/servlet/ServletContextInitializerBeansTests.java

@@ -27,6 +27,7 @@
 import jakarta.servlet.ServletContext;
 import jakarta.servlet.ServletRequest;
 import jakarta.servlet.ServletResponse;
+import jakarta.servlet.annotation.MultipartConfig;
 import jakarta.servlet.annotation.WebInitParam;
 import jakarta.servlet.http.HttpServlet;
 import jakarta.servlet.http.HttpServletRequest;
@@ -51,6 +52,7 @@
  * @author Andy Wilkinson
  * @author Moritz Halbritter
  * @author Daeho Kwon
+ * @author Dmytro Danilenkov
  */
 class ServletContextInitializerBeansTests {
 
@@ -127,6 +129,13 @@ void shouldApplyServletRegistrationAnnotation() {
 			assertThat(servletRegistrationBean.getServletName()).isEqualTo("test");
 			assertThat(servletRegistrationBean.isAsyncSupported()).isFalse();
 			assertThat(servletRegistrationBean.getUrlMappings()).containsExactly("/test/*");
+			assertThat(servletRegistrationBean.getInitParameters())
+				.containsExactlyInAnyOrderEntriesOf(Map.of("env", "test", "debug", "true"));
+			assertThat(servletRegistrationBean.getMultipartConfig()).isNotNull();
+			assertThat(servletRegistrationBean.getMultipartConfig().getLocation()).isEqualTo("/tmp");
+			assertThat(servletRegistrationBean.getMultipartConfig().getMaxFileSize()).isEqualTo(1024);
+			assertThat(servletRegistrationBean.getMultipartConfig().getMaxRequestSize()).isEqualTo(4096);
+			assertThat(servletRegistrationBean.getMultipartConfig().getFileSizeThreshold()).isEqualTo(128);
 		});
 	}
 
@@ -244,7 +253,11 @@ static class ServletConfigurationWithAnnotation {
 
 		@Bean
 		@ServletRegistration(enabled = false, name = "test", asyncSupported = false, urlMappings = "/test/*",
-				loadOnStartup = 1)
+				loadOnStartup = 1,
+				initParameters = { @WebInitParam(name = "env", value = "test"),
+						@WebInitParam(name = "debug", value = "true") },
+				multipartConfig = @MultipartConfig(location = "/tmp", maxFileSize = 1024, maxRequestSize = 4096,
+						fileSizeThreshold = 128))
 		TestServlet testServlet() {
 			return new TestServlet();
 		}