I used to wake up 7 AM last year. However, recently, I wake up later than I did. Since my wife retired her previous job, the starting time for my doughter’s nursery has changed from 8:30 to 9:00. My doughter often hates changing her pajamas and brushing her teeth. We are likely to be late. But as she was relatively good girl today, I went to the dentist in time after brought her to the nursery. At the office, after finish dental care, I wrote some code in Java. I’m not so familiar with Java, but Spring Boot’s DI mechanism is interesting for me. Writing a REST API server in Rust/Rocket as personel project, I have little bit of a problem in switching database backend between SQLite. In Java framework, databases are replasablable if they have same interface. Rust has trait object that behaves like interface as a Type in Java. But I’m not able to judge which is better solution, using &trait, or using Box<trait>.