Address Checkstyle

Issue gh-17447

Signed-off-by: Josh Cummings <3627351+jzheaux@users.noreply.github.com>

core/src/main/java/org/springframework/security/core/annotation/ExpressionTemplateSecurityAnnotationScanner.java

@@ -59,8 +59,8 @@ import org.springframework.util.PropertyPlaceholderHelper;
  * {@code @HasRole} annotation found on a given {@link AnnotatedElement}.
  *
  * <p>
- * Meta-annotations that use enum values can use {@link ExpressionTemplateValueProvider} to
+ * Meta-annotations that use enum values can use {@link ExpressionTemplateValueProvider}
- * provide custom placeholder values.
+ * to provide custom placeholder values.
  *
  * <p>
  * Since the process of synthesis is expensive, it is recommended to cache the synthesized
@@ -176,8 +176,8 @@ final class ExpressionTemplateSecurityAnnotationScanner<A extends Annotation>
 		}
 
 		@Override
-		public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
+		public @Nullable Object convert(@Nullable Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
-			return (source != null) ? ((ExpressionTemplateValueProvider)source).getExpressionTemplateValue() : null;
+			return (source != null) ? ((ExpressionTemplateValueProvider) source).getExpressionTemplateValue() : null;
 		}
 
 	}

core/src/main/java/org/springframework/security/core/annotation/ExpressionTemplateValueProvider.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2004-present the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package org.springframework.security.core.annotation;
 
 /**
@@ -20,14 +36,13 @@ package org.springframework.security.core.annotation;
  * }
  * </pre>
  *
- * @since 6.5
  * @author Mike Heath
+ * @since 7.0
  */
 public interface ExpressionTemplateValueProvider {
 
 	/**
 	 * Returns the value to be used in an expression template.
-	 *
 	 * @return the value to be used in an expression template
 	 */
 	String getExpressionTemplateValue();

core/src/test/java/org/springframework/security/core/annotation/ExpressionTemplateSecurityAnnotationScannerTests.java

@@ -62,8 +62,8 @@ public class ExpressionTemplateSecurityAnnotationScannerTests {
 	}
 
 	enum Permission implements ExpressionTemplateValueProvider {
-		READ,
+
-		WRITE;
+		READ, WRITE;
 
 		@Override
 		public String getExpressionTemplateValue() {
@@ -72,6 +72,7 @@ public class ExpressionTemplateSecurityAnnotationScannerTests {
 				case WRITE -> "'user.WRITE'";
 			};
 		}
+
 	}
 
 	@Documented
@@ -89,6 +90,7 @@ public class ExpressionTemplateSecurityAnnotationScannerTests {
 	@Target({ ElementType.TYPE, ElementType.METHOD })
 	@HasAnyCustomPermissions(permissions = { Permission.READ, Permission.WRITE })
 	@interface HasAllCustomPermissions {
+
 	}
 
 	@Documented