oscar questions

• How to refactor chain of asynchronous calls in vertx to avoid the callback hell
• NullHandling.NULLS_LAST not working
• Append default order by id to Pageable with Spring Data
• Get user that runs an asynchronous method
• What is the best way to test Controllers and Services with JUnit?
• Add csrf token with mockmvc and junit
• How to test spring configuration classes?
• Process multiple messaging with Mqttclient asynchronously and concurrently

oscar answers