NullPointerException on mockito spring's NamedParameterJdbcTemplate - spring-boot

Question

i have a DAO class that I am trying to write test cases
Here is modified reproducible code
the DAO class I am trying to test
#Component
public class SomeDAO {
#Autowired
private NamedParameterJdbcTemplate namedParameterJdbcTemplate;
public boolean dataInTable(String id) {
String sql = "SELECT COUNT(*) " +
"FROM table1" +
"WHERE id =:id";
MapSqlParameterSource sqlParms = new MapSqlParameterSource();
sqlParms.addValue("id", id
try {
int count = namedParameterJdbcTemplate.queryForObject(sql, sqlParms, Integer.class);
return (count > 0) ? true : false;
} catch (Exception e) {
log.error("Error checking existence of id : " + id);
throw e;
}
}
}
When i run the test, it throws an NullPointer on
int count = namedParameterJdbcTemplate.queryForObject(sql, sqlParms, Integer.class);
so i believe mockito is not returning a value on when, thenReturn
i searched around stack overflow and it looks like what i have should work, but I am getting NullPointerException.
I have also tried using the same value for sql string and a mapObject as the dao class instead of anyString() and anyMap()
but did not work either
Test case
#RunWith(MockitoJUnitRunner.class)
public class SomeDAOTest {
#InjectMocks
SomeDAO someDao
#Mock
NamedParameterJdbcTemplate namedParameterJdbcTemplate;
#Before
public void init() {
MockitoAnnotations.initMocks(this);
}
#Test
public void TestdataInTable(){
//
when(namedParameterJdbcTemplate.queryForObject(anyString(), anyMap(),eq(Integer.class))).thenReturn(1);
assertEquals( true,someDao.dataInTable("123456"));
}
}

Answer 1

Try this,
#Test
public void TestdataInTable() {
Mockito.when(namedParameterJdbcTemplate.queryForObject(Mockito.anyString(),
Mockito.any(SqlParameterSource.class), Mockito.eq(Integer.class))).thenReturn(1);
assertEquals(true, someDao.dataInTable("123456"));
}
The second parameter in queryForObject() is of type SqlParameterSource, which is not directly a map. So it should be, Mockito.any(SqlParameterSource.class).
The current version of your code displays warning in console, which is the best way to debug the issue.
[MockitoHint] TestDao.TestdataInTable (see javadoc for MockitoHint):
[MockitoHint] 1. Unused... -> at TestDao.TestdataInTable(TestDao.java:33)
[MockitoHint] ...args ok? -> at SomeDao.dataInTable(SomeDao.java:26)

Answer 2

Adding this as it may help someone:
I had a similar issue but the reason was very different.
I was getting null pointer exception not just on NamedParameterJdbcTemplate which was annotated with #Mock but also on #InjectMocks.
It so turn out that I was using Junit 5. The above solution will work with Junit 4. To make Mockito use Junit 5, an additional annotation is required. Also make sure you remove #RunWith(MockitoJUnitRunner.class) as this will cause failure. Instead use #ExtendWith(MockitoExtension.class.
Here is an example:
#ExtendWith(MockitoExtension.class)
public class SomeDAOTest {
#InjectMocks
SomeDAO someDao
#Mock
NamedParameterJdbcTemplate namedParameterJdbcTemplate;