org.mockito.exceptions.misusing.InvalidUseOfMatchersException: Invalid use of argument matchers

Question

I have multiple mock statements in my test class and everything works fine. I am adding a new statement for a DAO mocking as :

 Mockito.when(myDAO.saveOrUpdate(Mockito.any())).thenReturn(Mockito.any());

But I get exception as :

org.mockito.exceptions.misusing.InvalidUseOfMatchersException:  Invalid use of argument matchers!

I have used argument matchers and not raw values so I have not mixed anything.What can be the cause here?

i can return new dummy object also. But wana know why this is not working — user124, May 20 '22 at 12:02
Does this answer your question? [Mockito: using a method in "thenReturn" to return a mock doesn't work](https://stackoverflow.com/questions/34005168/mockito-using-a-method-in-thenreturn-to-return-a-mock-doesnt-work) — HariHaravelan, May 20 '22 at 12:19

score 3 · Accepted Answer · answered May 20 '22 at 12:15

3

You called an argument matcher outside a call to when or verify, which is illegal.

See Argument matchers:

Matcher methods like any(), eq() do not return matchers. Internally, they record a matcher on a stack and return a dummy value (usually null). This implementation is due to static type safety imposed by the java compiler. The consequence is that you cannot use any(), eq() methods outside of verified/stubbed method.

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: Invalid use of argument matchers

1 Answers1