ResponseEntity provides static "unprocessableEntity()" convenience method as well

Issue: SPR-12515

spring-web/src/main/java/org/springframework/http/ResponseEntity.java

@@ -246,6 +246,16 @@ public class ResponseEntity<T> extends HttpEntity<T> {
 		return status(HttpStatus.NOT_FOUND);
 	}
 
+	/**
+	 * Create a builder with an
+	 * {@linkplain HttpStatus#UNPROCESSABLE_ENTITY UNPROCESSABLE_ENTITY} status.
+	 * @return the created builder
+	 * @since 4.1.3
+	 */
+	public static HeadersBuilder<?> unprocessableEntity() {
+		return status(HttpStatus.UNPROCESSABLE_ENTITY);
+	}
+
 
 	/**
 	 * Defines a builder that adds headers to the response entity.

spring-web/src/test/java/org/springframework/http/ResponseEntityTests.java

@@ -26,6 +26,7 @@ import static org.junit.Assert.*;
 
 /**
  * @author Arjen Poutsma
+ * @author Marcel Overdijk
  */
 public class ResponseEntityTests {
 
@@ -119,6 +120,15 @@ public class ResponseEntityTests {
 		assertNull(responseEntity.getBody());
 	}
 
+	@Test
+	public void unprocessableEntity() throws URISyntaxException {
+		ResponseEntity<Void> responseEntity = ResponseEntity.unprocessableEntity().build();
+
+		assertNotNull(responseEntity);
+		assertEquals(HttpStatus.UNPROCESSABLE_ENTITY, responseEntity.getStatusCode());
+		assertNull(responseEntity.getBody());
+	}
+
 	@Test
 	public void headers() throws URISyntaxException {
 		String eTag = "\"foo\"";