Merge branch '5.1.x'

spring-core/src/main/java/org/springframework/util/MimeTypeUtils.java

@@ -44,6 +44,7 @@ import org.springframework.lang.Nullable;
  * @author Rossen Stoyanchev
  * @author Dimitrios Liapis
  * @author Brian Clozel
+ * @author Sam Brannen
  * @since 4.0
  */
 public abstract class MimeTypeUtils {
@@ -273,10 +274,11 @@ public abstract class MimeTypeUtils {
 			return Collections.emptyList();
 		}
 		return tokenize(mimeTypes).stream()
-				.map(MimeTypeUtils::parseMimeType).collect(Collectors.toList());
+				.filter(StringUtils::hasText)
+				.map(MimeTypeUtils::parseMimeType)
+				.collect(Collectors.toList());
 	}
 
-
 	/**
 	 * Tokenize the given comma-separated string of {@code MimeType} objects
 	 * into a {@code List<String>}. Unlike simple tokenization by ",", this

spring-core/src/test/java/org/springframework/util/MimeTypeTests.java

@@ -303,6 +303,13 @@ public class MimeTypeTests {
 		assertThat(mimeTypes.size()).as("Invalid amount of mime types").isEqualTo(0);
 	}
 
+	@Test // gh-23241
+	public void parseMimeTypesWithTrailingComma() {
+		List<MimeType> mimeTypes = MimeTypeUtils.parseMimeTypes("text/plain, text/html,");
+		assertThat(mimeTypes).as("No mime types returned").isNotNull();
+		assertThat(mimeTypes.size()).as("Incorrect number of mime types").isEqualTo(2);
+	}
+
 	@Test // SPR-17459
 	public void parseMimeTypesWithQuotedParameters() {
 		testWithQuotedParameters("foo/bar;param=\",\"");

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

@@ -596,7 +596,9 @@ public class MediaType extends MimeType implements Serializable {
 		List<String> tokenizedTypes = MimeTypeUtils.tokenize(mediaTypes);
 		List<MediaType> result = new ArrayList<>(tokenizedTypes.size());
 		for (String type : tokenizedTypes) {
-			result.add(parseMediaType(type));
+			if (StringUtils.hasText(type)) {
+				result.add(parseMediaType(type));
+			}
 		}
 		return result;
 	}

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

@@ -35,6 +35,7 @@ import static org.assertj.core.api.Assertions.within;
 /**
  * @author Arjen Poutsma
  * @author Juergen Hoeller
+ * @author Sam Brannen
  */
 public class MediaTypeTests {
 
@@ -159,6 +160,13 @@ public class MediaTypeTests {
 		assertThat(mediaTypes.size()).as("Invalid amount of media types").isEqualTo(0);
 	}
 
+	@Test // gh-23241
+	public void parseMediaTypesWithTrailingComma() {
+		List<MediaType> mediaTypes = MediaType.parseMediaTypes("text/plain, text/html, ");
+		assertThat(mediaTypes).as("No media types returned").isNotNull();
+		assertThat(mediaTypes.size()).as("Incorrect number of media types").isEqualTo(2);
+	}
+
 	@Test
 	public void compareTo() {
 		MediaType audioBasic = new MediaType("audio", "basic");