Polish

See gh-18192

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/tasks/bundling/BootJar.java

@@ -134,10 +134,12 @@ public class BootJar extends Jar implements BootArchive {
 				classpath);
 	}
 
+	@Override
 	public void setClasspath(Object classpath) {
 		this.classpath = getProject().files(classpath);
 	}
 
+	@Override
 	public void setClasspath(FileCollection classpath) {
 		this.classpath = getProject().files(classpath);
 	}