If you like to get the arguments of a mocked service call SERVICEMETHOD
you can use this
ArgumentCaptor<AnyClass> captor = ArgumentCaptor.forClass(AnyClass.class);
verify(service, times(1)).SERVICEMETHOD(captor.capture());
AnyClass anyObject = captor.getValue();
Now you can have a look if anyObject is setup as expected.
For methods with multipe Arguments, just add suitable ArgumentCaptors.
ArgumentCaptor<AnyClass1> captor1 = ArgumentCaptor.forClass(AnyClass1.class);
ArgumentCaptor<AnyClass2> captor2 = ArgumentCaptor.forClass(AnyClass2.class);
ArgumentCaptor<AnyClass3> captor3 = ArgumentCaptor.forClass(AnyClass3.class);
verify(service, times(1)).SERVICEMETHOD(captor1.capture(), captor2.capture(), captor3.capture());
AnyClass1 anyObject1 = captor1.getValue();
AnyClass2 anyObject2 = captor2.getValue();
AnyClass3 anyObject3 = captor3.getValue();