Fix checkstyle issues

See gh-4763

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/NonRecursivePropertyPlaceholderHelper.java

@@ -44,7 +44,7 @@ class NonRecursivePropertyPlaceholderHelper extends PropertyPlaceholderHelper {
 
 		private final PlaceholderResolver resolver;
 
-		public NonRecursivePlaceholderResolver(PlaceholderResolver resolver) {
+		NonRecursivePlaceholderResolver(PlaceholderResolver resolver) {
 			this.resolver = resolver;
 		}
 

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/DefaultErrorViewIntegrationTests.java

@@ -106,6 +106,10 @@ public class DefaultErrorViewIntegrationTests {
 		assertFalse("Wrong content: " + content, content.contains("injection"));
 	}
 
+	public static String injectCall() {
+		return "injection";
+	}
+
 	@Target(ElementType.TYPE)
 	@Retention(RetentionPolicy.RUNTIME)
 	@Documented
@@ -128,8 +132,4 @@ public class DefaultErrorViewIntegrationTests {
 
 	}
 
-	public static String injectCall() {
-		return "injection";
-	}
-
 }