I’m facing a null error when I attempt to retrieve data from the repository. How do I update this test to resolve the null error?

java.lang.NullPointerException: Cannot invoke "StudentSystemRepository.getLimitedStudentPayerList()" because "this.StudentSystemRepository" is null

@SpringBootTest 
@DataJpaTest
public class TestStudentLog { 

    @Autowired
    private StudentSystemRepository StudentSystemRepository;

    @Test
    public void testGetLimitedStudentPayersList() {
        
        // Call the method to retrieve the list of limited Student payers
        List<StudentPayer> limitedStudentPayers = StudentSystemRepository.getLimitedStudentPayerList();
        
        System.out.println(limitedStudentPayers);
    }

}