Georgi Michev questions

• SpringBootTest annotation cannot be resolved to a type
• Get List<String> while concat 3 Streams from lists of different objects
• JSON parse error: Cannot deserialize value of type `java.time.LocalDateTime` from String
• How to customize the error message for NoSuchElementException in Optional class
• get an int value with @Value
• Value annotation not working in Junit test
• Occasional IncorrectResultSizeDataAccessException when running a mongo query

Georgi Michev answers