Spring/spring-data-examples

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Oliver Gierke 0ddb2ba0d6 Added showcase for JDK 8's Optional support on repository methods.

Abbreviated JPA sample module folder names. Renamed the Java 8 auditing sample module to Java 8 module as it not only contains samples for auditing anymore.

2014-04-22 14:48:00 +02:00

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Spring Data - Java 8 examples

This project contains samples of Java 8 specific features of Spring Data (JPA).

Support for JDK 8's `Optional` for repository methods

interface CustomerRepository extends Repository<Customer, Long> {

  // CRUD method using Optional
  Optional<Customer> findOne(Long id);

  // Query method using Optional
  Optional<Customer> findByLastname(String lastname);
}

CustomerRepository.findOne(Long) effectively "overrides" the default CrudRepository.findOne(…) to return Optional.empty() instead of null in case no uniqe element satisfying the query can be found.
CustomerRepository.findByLastname(…) does the same for a normal query method.

Support for JDK 8's date/time types in the auditing sub-system

Customer extends AbstractEntity which contains fields of JDK 8's new date/time API and those can be populated the same way legacy types like Date and Calendar can.