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  1. ,
    Expert tip

    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.

Solutions on the web

via Spring JIRA by Gary Russell, 1 year ago
[Assertion failed] - this argument is required; it must not be null
via Spring JIRA by Gary Russell, 1 year ago
[Assertion failed] - this argument is required; it must not be null
via Stack Overflow by jnikolic
, 2 years ago
[Assertion failed] - this argument is required; it must not be null
via Stack Overflow by vivek_ganesan
, 2 years ago
[Assertion failed] - this argument is required; it must not be null
via markmail.org by Unknown author, 1 year ago
via Google Groups by Jenkins, 1 month ago
[Assertion failed] - this argument is required; it must not be null
java.lang.IllegalArgumentException: [Assertion failed] - this argument is required; it must not be null	at org.springframework.util.Assert.notNull(Assert.java:112)	at org.springframework.util.Assert.notNull(Assert.java:123)	at org.springframework.hateoas.mvc.ResourceAssemblerSupport.createResourceWithId(ResourceAssemblerSupport.java:87)	at org.springframework.xd.dirt.rest.StepExecutionInfoResourceAssembler.toResource(StepExecutionInfoResourceAssembler.java:39)	at org.springframework.xd.dirt.rest.BatchStepExecutionsController.list(BatchStepExecutionsController.java:107)