Mockito Matchers: matching a Class type in parameter list

Question

I am working with Java, Spring's RestTemplate, and Mockito, using Eclipse. I am trying to mock Spring's rest template, and the last parameter for the method I am mocking is a Class type. Below is the signature for the function:

public <T> ResponseEntity<T> exchange(URI url,
                                  HttpMethod method,
                                  HttpEntity<?> requestEntity,
                                  Class<T> responseType)
                       throws RestClientException

The initial attempt I made to mock this method is as follows:

//given restTemplate returns exception
when(restTemplate.exchange(isA(URI.class), eq(HttpMethod.POST), isA(HttpEntity.class), eq(Long.class))).thenThrow(new RestClientException(EXCEPTION_MESSAGE));

However, this line of code produces the following error from eclipse:

The method exchange(URI, HttpMethod, HttpEntity<?>, Class<T>) in the type RestTemplate is not applicable for the arguments (URI, HttpMethod, HttpEntity, Class<Long>)

Eclipse then suggests I cast the last parameter with a 'Class' cast, but does not seem to work if I cast it to a 'Class', or other type.

I've been looking online for help on this, but seem to stumped on the fact that the parameter requested is a class type.

The answers I've looked at so far have been mainly related to generic collections. Any help here would be greatly appreciated.

Answer 1

Figured out.

The method being called was a parameterized method, but could not infer the parameter type from the matcher argument (the last argument was of type Class).

Making the explicit call

when(restTemplate.<Long>exchange(isA(URI.class),eq(HttpMethod.POST),isA(HttpEntity.class), eq(Long.class))).thenThrow(new RestClientException(EXCEPTION_MESSAGE));

fixed my problem.