Polishing

(cherry picked from commit 5a92aa4)

spring-core/src/main/java/org/springframework/core/io/FileSystemResource.java

@@ -30,7 +30,7 @@ import org.springframework.util.StringUtils;
 
 /**
  * {@link Resource} implementation for {@code java.io.File} handles.
- * Obviously supports resolution as File, and also as URL.
+ * Supports resolution as a {@code File} and also as a {@code URL}.
  * Implements the extended {@link WritableResource} interface.
  *
  * @author Juergen Hoeller

spring-core/src/main/java/org/springframework/core/io/UrlResource.java

@@ -32,7 +32,7 @@ import org.springframework.util.StringUtils;
 
 /**
  * {@link Resource} implementation for {@code java.net.URL} locators.
- * <p>Supports resolution as a {@code URL} and also as a {@code File} in
+ * Supports resolution as a {@code URL} and also as a {@code File} in
  * case of the {@code "file:"} protocol.
  *
  * @author Juergen Hoeller
@@ -134,6 +134,7 @@ public class UrlResource extends AbstractFileResolvingResource {
 		}
 	}
 
+
 	/**
 	 * Determine a cleaned URL for the given original URL.
 	 * @param originalUrl the original URL
@@ -152,7 +153,6 @@ public class UrlResource extends AbstractFileResolvingResource {
 		}
 	}
 
-
 	/**
 	 * This implementation opens an InputStream for the given URL.
 	 * <p>It sets the {@code useCaches} flag to {@code false},

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

@@ -56,16 +56,16 @@ public abstract class ClassUtils {
 	/** Prefix for internal non-primitive array class names: "[L" */
 	private static final String NON_PRIMITIVE_ARRAY_PREFIX = "[L";
 
-	/** The package separator character '.' */
+	/** The package separator character: '.' */
 	private static final char PACKAGE_SEPARATOR = '.';
 
-	/** The path separator character '/' */
+	/** The path separator character: '/' */
 	private static final char PATH_SEPARATOR = '/';
 
-	/** The inner class separator character '$' */
+	/** The inner class separator character: '$' */
 	private static final char INNER_CLASS_SEPARATOR = '$';
 
-	/** The CGLIB class separator character "$$" */
+	/** The CGLIB class separator: "$$" */
 	public static final String CGLIB_CLASS_SEPARATOR = "$$";
 
 	/** The ".class" file suffix */

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/ServletWrappingController.java

@@ -137,11 +137,7 @@ public class ServletWrappingController extends AbstractController
 	@Override
 	public void afterPropertiesSet() throws Exception {
 		if (this.servletClass == null) {
-			throw new IllegalArgumentException("servletClass is required");
-		}
-		if (!Servlet.class.isAssignableFrom(this.servletClass)) {
-			throw new IllegalArgumentException("servletClass [" + this.servletClass.getName() +
-					"] needs to implement interface [javax.servlet.Servlet]");
+			throw new IllegalArgumentException("'servletClass' is required");
 		}
 		if (this.servletName == null) {
 			this.servletName = this.beanName;