回答編集履歴
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追記
test
CHANGED
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@@ -21,3 +21,27 @@
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[参考: Spring公式のissue](https://github.com/spring-projects/spring-data-commons/issues/1399)
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27
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---
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28
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■追記
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Optionalは、色々書き方がありますが、例えば以下のようなことができます。
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```java
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public Customer findOne(Integer id) {
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return customerRepository.findById(id).orElseThrow(() ->
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new EntityNotFoundException("Customer not found with id " + id));
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}
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```
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