backported fix for SPR-8697 from 3.1 RC2

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

@@ -404,7 +404,6 @@ public class MediaType implements Comparable<MediaType> {
 			int otherPlusIdx = other.subtype.indexOf('+');
 			if (thisPlusIdx != -1 && otherPlusIdx != -1) {
 				String thisSubtypeNoSuffix = this.subtype.substring(0, thisPlusIdx);
-
 				String thisSubtypeSuffix = this.subtype.substring(thisPlusIdx + 1);
 				String otherSubtypeSuffix = other.subtype.substring(otherPlusIdx + 1);
 				if (thisSubtypeSuffix.equals(otherSubtypeSuffix) && WILDCARD_TYPE.equals(thisSubtypeNoSuffix)) {
@@ -575,6 +574,9 @@ public class MediaType implements Comparable<MediaType> {
 		}
 		String type = fullType.substring(0, subIndex);
 		String subtype = fullType.substring(subIndex + 1, fullType.length());
+		if (WILDCARD_TYPE.equals(type) && !WILDCARD_TYPE.equals(subtype)) {
+			throw new IllegalArgumentException("A wildcard type is legal only in '*/*' (all media types).");
+		}
 
 		Map<String, String> parameters = null;
 		if (parts.length > 1) {

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

 /*
- * Copyright 2002-2010 the original author or authors.
+ * Copyright 2002-2011 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,12 +23,13 @@ import java.util.Comparator;
 import java.util.List;
 import java.util.Random;
 
-import static org.junit.Assert.*;
 import org.junit.Test;
 
 import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.support.ConversionServiceFactory;
 
+import static org.junit.Assert.*;
+
 /**
  * @author Arjen Poutsma
  * @author Juergen Hoeller
@@ -127,6 +128,11 @@ public class MediaTypeTests {
 		MediaType.parseMediaType("audio/");
 	}
 
+	@Test(expected = IllegalArgumentException.class)
+	public void parseMediaTypeTypeRange() {
+		MediaType.parseMediaType("*/json");
+	}
+
 	@Test(expected = IllegalArgumentException.class)
 	public void parseMediaTypeIllegalType() {
 		MediaType.parseMediaType("audio(/basic");
@@ -496,4 +502,11 @@ public class MediaTypeTests {
 		assertEquals(mediaType, conversionService.convert("application/xml", MediaType.class));
 	}
 
+	@Test
+	public void isConcrete() {
+		assertTrue("text/plain not concrete", MediaType.TEXT_PLAIN.isConcrete());
+		assertFalse("*/* concrete", MediaType.ALL.isConcrete());
+		assertFalse("text/* concrete", new MediaType("text", "*").isConcrete());
+	}
+
 }