Fix "unnecessary @SuppressWarnings" warnings

spring-web/src/main/java/org/springframework/web/context/request/async/WebAsyncManager.java

@@ -252,7 +252,7 @@ public final class WebAsyncManager {
 	 * @see #getConcurrentResult()
 	 * @see #getConcurrentResultContext()
 	 */
-	@SuppressWarnings({ "rawtypes", "unchecked" })
+	@SuppressWarnings({"unchecked" })
 	public void startCallableProcessing(final Callable<?> callable, Object... processingContext) throws Exception {
 		Assert.notNull(callable, "Callable must not be null");
 		startCallableProcessing(new WebAsyncTask(callable), processingContext);

spring-web/src/main/java/org/springframework/web/context/support/ServletContextResourcePatternResolver.java

@@ -156,7 +156,6 @@ public class ServletContextResourcePatternResolver extends PathMatchingResourceP
 	 * @param result the Set of matching Resources to add to
 	 * @throws IOException if jar contents could not be retrieved
 	 */
-	@SuppressWarnings("unchecked")
 	private void doRetrieveMatchingJarEntries(String jarFilePath, String entryPattern, Set<Resource> result) {
 		if (logger.isDebugEnabled()) {
 			logger.debug("Searching jar file [" + jarFilePath + "] for entries matching [" + entryPattern + "]");

spring-web/src/main/java/org/springframework/web/multipart/support/DefaultMultipartHttpServletRequest.java

@@ -103,7 +103,6 @@ public class DefaultMultipartHttpServletRequest extends AbstractMultipartHttpSer
 	}
 
 	@Override
-	@SuppressWarnings("unchecked")
 	public Map<String, String[]> getParameterMap() {
 		Map<String, String[]> paramMap = new HashMap<String, String[]>();
 		paramMap.putAll(super.getParameterMap());

spring-web/src/main/java/org/springframework/web/util/WebUtils.java

@@ -573,7 +573,6 @@ public abstract class WebUtils {
 	 * @return the value of the parameter, or {@code null}
 	 * if the parameter does not exist in given request
 	 */
-	@SuppressWarnings("unchecked")
 	public static String findParameterValue(ServletRequest request, String name) {
 		return findParameterValue(request.getParameterMap(), name);
 	}