Mockito 不明确的方法调用

Question

I'm trying to stub out a method call, eg

when(amazonDynamoDBClient.batchWriteItem(anyObject())).thenReturn(batchWriteItemResultMock);

I get this error

Error:(198, 34) java: reference to batchWriteItem is ambiguous
  both method batchWriteItem(com.amazonaws.services.dynamodbv2.model.BatchWriteItemRequest) in com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient and method batchWriteItem(java.util.Map<java.lang.String,java.util.List<com.amazonaws.services.dynamodbv2.model.WriteRequest>>) in com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient match

I can't see how this is ambiguous - the method signatures are different, ie

public BatchWriteItemResult batchWriteItem(BatchWriteItemRequest request) {

and

public BatchWriteItemResult batchWriteItem(Map<String, List<WriteRequest>> requestItems) {

What am I doing wrong here?

Answer 1

You have two methods with the same name and return type, each with one parameter. So anyObject() matches both of them. That's why you get the batchWriteItem is ambiguous message.

You could use Mockito.any(Class<T> type) and Mockito.anyMapOf(Class<K> keyClazz, Class<V> valueClazz) to distinguish between them.

Docs for reference: any , anyMapOf

Answer 2

For me, using isA() fixed the issue.

Docs : IsA