java.lang.IllegalArgumentException: Could not find field 'isBoolean' of type [class java.lang.Boolean] on target object - spring

Question

When I run test then it failed at this point ReflectionTestUtils.setField(service, SeRepositoryImpl.class, "isBoolean",true,Boolean.class) complains about Could not find field 'isBoolean' of type not found. Error trace as below.
I am not sure why because my repositoryImpl class has isBoolean variable defined.
java.lang.IllegalArgumentException: Could not find field 'isBoolean' of type [class java.lang.Boolean] on target object [lautomation.repository.impl.SaRepositoryImpl#4a178d1e] or target class [lautomation.repository.impl.SaRepositoryImpl]
at org.springframework.test.util.ReflectionTestUtils.setField(ReflectionTestUtils.java:175)
test class looks like
#MockBean(name = "seRepository")
PolicyRepository seRepository;
#InjectMocks
private SeRepositoryImpl service;
#Before
public void setup() {
MockitoAnnotations.initMocks(this);
}
#Test
public void testUpdateStatus() throws Exception{
ReflectionTestUtils.setField(service, SeRepositoryImpl.class, "isBoolean",true,Boolean.class);
List<Policy> policies = Arrays.asList(new Policy[] {new Policy() });
service.updateIssuedStatus(Mockito.any(Policy.class));
Mockito.verify(seRepository, Mockito.times(1)).updateIssuedStatus(Mockito.any(Policy.class));
}
}
Respository implementation class SeRepositoryImpl has isBoolean variable defined
#Repository("seRepository")
#Log4j
public class SeRepositoryImpl implements PolicyRepository {
#Value("${change-db}")
private boolean isBoolean;
#Autowired
#Qualifier("jdbcDbName")
private NamedParameterJdbcTemplate jdbcTemplate;
#Override
public void updateIssuedStatus(final Policy policy) {
if(!isBoolean) {
log.warn("isBoolean is set to false - skipping db write.");
return;
}
final HashMap<String, String> params = new HashMap<>();
params.put("issued",
new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
params.put("id", Integer.toString(policy.getId()));
jdbcTemplate.update(updateIssuedStatus, params);
String currDate = new SimpleDateFormat("yyyy-MM-dd").format(new Date());
log.info("params:"+Integer.toString(policy.getId())+" Date:"+currDate);
final String sql = "call usp_updateDatabase(:policy,:currDate)";
MapSqlParameterSource value = new MapSqlParameterSource();
value.addValue("id",Integer.toString(policy.getId()));
value.addValue("stop_dt",new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
jdbcTemplate.update(sql, value);
}
}