Consistent use of @Nullable in spring-test

This commit also removes nullability from two common spots: ResolvableType.getType() and TargetSource.getTarget(), both of which are never effectively null with any regular implementation. For such scenarios, a non-null empty type/target is the cleaner contract.

Issue: SPR-15540

spring-webmvc/src/main/java/org/springframework/web/servlet/handler/MappedInterceptor.java

@@ -111,7 +111,7 @@ public final class MappedInterceptor implements HandlerInterceptor {
 	}
 
 	/**
-	 * The configured PathMatcher, or {@code null}.
+	 * The configured PathMatcher, or {@code null} if none.
 	 */
 	@Nullable
 	public PathMatcher getPathMatcher() {
@@ -121,6 +121,7 @@ public final class MappedInterceptor implements HandlerInterceptor {
 	/**
 	 * The path into the application the interceptor is mapped to.
 	 */
+	@Nullable
 	public String[] getPathPatterns() {
 		return this.includePatterns;
 	}

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/AbstractMessageConverterMethodProcessor.java

@@ -278,7 +278,6 @@ public abstract class AbstractMessageConverterMethodProcessor extends AbstractMe
 	 * Return the generic type of the {@code returnType} (or of the nested type
 	 * if it is an {@link HttpEntity}).
 	 */
-	@Nullable
 	private Type getGenericType(MethodParameter returnType) {
 		if (HttpEntity.class.isAssignableFrom(returnType.getParameterType())) {
 			return ResolvableType.forType(returnType.getGenericParameterType()).getGeneric().getType();

spring-webmvc/src/main/java/org/springframework/web/servlet/view/UrlBasedViewResolver.java

@@ -519,11 +519,12 @@ public class UrlBasedViewResolver extends AbstractCachingViewResolver implements
 	private View applyLifecycleMethods(String viewName, AbstractView view) {
 		ApplicationContext context = getApplicationContext();
 		if (context != null) {
-			return (View) context.getAutowireCapableBeanFactory().initializeBean(view, viewName);
-		}
-		else {
-			return view;
+			Object initialized = context.getAutowireCapableBeanFactory().initializeBean(view, viewName);
+			if (initialized instanceof View) {
+				return (View) initialized;
+			}
 		}
+		return view;
 	}
 
 	/**