Graham Pople added a comment - 06/Oct/21 6:17 AM - edited Tests against mock are passing except for one error: org.mockito.exceptions.misusing.CannotStubVoidMethodWithReturnValue: 'send' is a *void method* and it *cannot* be stubbed with a *return value*! com.couchbase.client.core.service.PooledServiceTest.cleansIdleConnections(PooledServiceTest.java:481) The error doesn't make sense as the mocked method isn't a void one.  Unclear if this is Graviton related. Update: also happening on non-Graviton, so we're good to go.