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    If you're unit testing, you should instantiate only the service and mock the dependencies. If you're testing integration, you should add all the mocking to the configurations file.

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java.lang.IllegalArgumentException: payload must not be null	at org.springframework.util.Assert.notNull(	at	at	at org.springframework.integration.endpoint.AbstractMessageSource.receive(	at org.springframework.integration.endpoint.SourcePollingChannelAdapter.doPoll(	at org.springframework.integration.endpoint.AbstractPollingEndpoint$	at org.springframework.integration.endpoint.AbstractPollingEndpoint$	at org.springframework.integration.endpoint.AbstractPollingEndpoint$Poller$	at org.springframework.integration.util.ErrorHandlingTaskExecutor$	at org.springframework.core.task.SyncTaskExecutor.execute(	at org.springframework.integration.util.ErrorHandlingTaskExecutor.execute(	at org.springframework.integration.endpoint.AbstractPollingEndpoint$	at	at	at java.util.concurrent.Executors$	at java.util.concurrent.FutureTask$Sync.innerRun(	at	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(	at java.util.concurrent.ScheduledThreadPoolExecutor$	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(	at java.util.concurrent.ThreadPoolExecutor$	at