Protect against NoSuchMethodException on setReadOnly

See gh-44331

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/tomcat/TomcatServletWebServerFactory.java

@@ -240,7 +240,7 @@ protected void prepareContext(Host host, ServletContextInitializer[] initializer
 		TomcatEmbeddedContext context = new TomcatEmbeddedContext();
 		WebResourceRoot resourceRoot = (documentRoot != null) ? new LoaderHidingResourceRoot(context)
 				: new StandardRoot(context);
-		resourceRoot.setReadOnly(true);
+		ignoringNoSuchMethodError(() -> resourceRoot.setReadOnly(true));
 		context.setResources(resourceRoot);
 		context.setName(getContextPath());
 		context.setDisplayName(getDisplayName());
@@ -253,12 +253,7 @@ protected void prepareContext(Host host, ServletContextInitializer[] initializer
 		context.setParentClassLoader(parentClassLoader);
 		resetDefaultLocaleMapping(context);
 		addLocaleMappings(context);
-		try {
-			context.setCreateUploadTargets(true);
-		}
-		catch (NoSuchMethodError ex) {
-			// Tomcat is < 8.5.39. Continue.
-		}
+		ignoringNoSuchMethodError(() -> context.setCreateUploadTargets(true));
 		configureTldPatterns(context);
 		WebappLoader loader = new WebappLoader();
 		loader.setLoaderInstance(new TomcatEmbeddedWebappClassLoader(parentClassLoader));
@@ -278,6 +273,14 @@ protected void prepareContext(Host host, ServletContextInitializer[] initializer
 		postProcessContext(context);
 	}
 
+	private void ignoringNoSuchMethodError(Runnable method) {
+		try {
+			method.run();
+		}
+		catch (NoSuchMethodError ex) {
+		}
+	}
+
 	/**
 	 * Override Tomcat's default locale mappings to align with other servers. See
 	 * {@code org.apache.catalina.util.CharsetMapperDefault.properties}.