GOTO AMS 2019 Upgrade Time! Choose Java 11 or the other one… Kotlin!
- 1. Upgrade Time! Choose Java 11 or the other one… Kotlin! Paulien van Alst
- 3. Highlights Java 9/10/11 switch statements var something = “Something” JShell Convenience methods for collections Release cadence
- 4. My story with Kotlin boardGameRepository.findAllByCategory(ADVENTURE).stream() .filter(game -> game.getMinimalNumberOfPlayers() > 2) .filter(game -> game.getMinimalAge() > 10) .map(BoardGameEntity::getPrice) .reduce(BigDecimal.ZERO, BigDecimal::add);
- 5. My story with Kotlin boardGameRepository.findAllByCategory(ADVENTURE).stream() .filter(game -> game.getMinimalNumberOfPlayers() > 2) .filter(game -> game.getMinimalAge() > 10) .map(BoardGameEntity::getPrice) .reduce(BigDecimal.ZERO, BigDecimal::add); boardGameRepository.findAllByCategory(ADVENTURE) .moreThanTwoPlayers() .olderThanTenToPlay() .meanPrice()
- 6. My story with Kotlin boardGameRepository.findAllByCategory(ADVENTURE).stream() .filter(game -> game.getMinimalNumberOfPlayers() > 2) .filter(game -> game.getMinimalAge() > 10) .map(BoardGameEntity::getPrice) .reduce(BigDecimal.ZERO, BigDecimal::add); boardGameRepository.findAllByCategory(ADVENTURE) .moreThanTwoPlayers() .olderThanTenToPlay() .meanPrice()
- 7. My story with Kotlin boardGameRepository.findAllByCategory(ADVENTURE).stream() .filter(game -> game.getMinimalNumberOfPlayers() > 2) .filter(game -> game.getMinimalAge() > 10) .map(BoardGameEntity::getPrice) .reduce(BigDecimal.ZERO, BigDecimal::add); boardGameRepository.findAllByCategory(ADVENTURE) .moreThanTwoPlayers() .olderThanTenToPlay() .meanPrice()
- 8. My story with Kotlin boardGameRepository.findAllByCategory(ADVENTURE).stream() .filter(game -> game.getMinimalNumberOfPlayers() > 2) .filter(game -> game.getMinimalAge() > 10) .map(BoardGameEntity::getPrice) .reduce(BigDecimal.ZERO, BigDecimal::add); boardGameRepository.findAllByCategory(ADVENTURE) .moreThanTwoPlayers() .olderThanTenToPlay() .meanPrice()
- 9. My story with Kotlin boardGameRepository.findAllByCategory(ADVENTURE).stream() .filter(game -> game.getMinimalNumberOfPlayers() > 2) .filter(game -> game.getMinimalAge() > 10) .map(BoardGameEntity::getPrice) .reduce(BigDecimal.ZERO, BigDecimal::add); boardGameRepository.findAllByCategory(ADVENTURE) .moreThanTwoPlayers() .olderThanTenToPlay() .meanPrice()
- 10. Reasons to switch to Kotlin Regular updates Interoperability Multiplatform Readability Less boilerplate Safe programming
- 11. What to keep in mind Interoperability Idioms Magic problem solver
- 12. Warning! DO this at home or In a POC
- 13. Let’s start! Rates 8 Games above … 8 Dominion Dominion Ticket to ride
- 14. Let’s start! Spring boot 2 In memory database UT’s and IT’s
- 15. Migration Plan 1. Set-up dependencies 2. Migrate PoJo’s 3. Rewrite unit tests 4. Core logic 5. Configuration
- 17. Migration Plan 1. Set-up dependencies 2. Migrate PoJo’s 3. Rewrite unit tests 4. Core logic 5. Configuration