Hi Ajith

From first glance, I think your problem is with the Spring application context. You are running a Mock test with @RunWith(MockitoJunitRunner.class). However, maybe you want to @RunWith(SpringRunner.class) as the SpringRunner provides support for loading a Spring Application Context and having beans @Autowired into your test instance. MockitoJunitRunner will you create a Mock object based on the type you demand – StockService in your guess. Have you tried to go this way? Hope it helped.

public class StockController{
@Autowired
private StockService stockService;

public GatewayResponse findProduct(String productId) {
try{
Optional optional = stockService.getProduct(productId);
if (optional.isPresent()) {
Product product = optional.get();
return new GatewayResponse(HttpStatus.Ok,product, Message.SUCCESS.getDesc());
}
return new GatewayResponse(HttpStatus.NO_CONTENT,product, Message.SUCCESS.getDesc());
}
catch(Exception e)
{
log.info(“bad product id……..”);
}
}

******************
Test class

@RunWith(MockitoJunitRunner.class)
public void ControllerTest()
{
@InjectMocks
StockController stockController;
@Mock
StockService stockService;
@Test
public void findProductTest()
{
String productId = “pr455”;
Product pr = new Product();
pr.setName(“buhbdf”);
when(stockService.getProduct(productId)).thenReturn(Optional.of(product));
MvcResults mvcResults = mockMvc.perform(get(“/product”).param(“id”, productId)).andExpect(Status().isOk()).andReturn();
}

NOTE: just exclude if any syntax exceptions it might be my typing mistakes. every thing is fine just getting NullpointerException. i declared MockMvc object also bt didn’t mension here

when debugging in StockController i am getting null pointer Exception in —-> if (optional.isPresent())

plss help me to solve this