0ddb2ba0d6
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.
23 lines
948 B
Markdown
23 lines
948 B
Markdown
# Spring Data - Java 8 examples
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This project contains samples of Java 8 specific features of Spring Data (JPA).
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## Support for JDK 8's `Optional` for repository methods
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```java
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interface CustomerRepository extends Repository<Customer, Long> {
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// CRUD method using Optional
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Optional<Customer> findOne(Long id);
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// Query method using Optional
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Optional<Customer> findByLastname(String lastname);
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}
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```
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* `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.
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* `CustomerRepository.findByLastname(…)` does the same for a normal query method.
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## Support for JDK 8's date/time types in the auditing sub-system
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* `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. |