Fixing Problems with Bookmark Filter "EL1008E: Property or field

'principal' cannot be found on object of type 'java.lang.Object[]' -
maybe not public or not valid"

pom.xml

@@ -160,6 +160,16 @@
             <groupId>org.springframework.data</groupId>
             <artifactId>spring-data-commons</artifactId>
         </dependency>
+        <!-- https://mvnrepository.com/artifact/org.springframework.security/spring-security-data -->
+		<dependency>
+		    <groupId>org.springframework.security</groupId>
+		    <artifactId>spring-security-data</artifactId>
+		    <!--   <version>5.6.1</version> -->
+		</dependency>
+		<dependency>
+		    <groupId>org.springframework</groupId>
+		    <artifactId>spring-context</artifactId>
+		</dependency>
         <dependency>
             <groupId>com.zaxxer</groupId>
             <artifactId>HikariCP</artifactId>

src/main/java/at/ac/uibk/gitsearch/repository/UserWatchListRepository.java

@@ -15,7 +15,6 @@ import java.util.List;
 /**
  * Spring Data  repository for the UserWatchList entity.
  */
-@SuppressWarnings("unused")
 @Repository
 public interface UserWatchListRepository extends JpaRepository<UserWatchList, Long>, JpaSpecificationExecutor<UserWatchList> {