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並前往https://jivimberg.io/blog/2018/06/23/oracle-jpa-and-the-mistery-of-the-string-that-was-null/

Oracle, JPA and the Mystery of the String That Was Null

But since I was using @DataJpaTest with H2 embedded DB empty strings where empty strings an nulls where nulls. So the issue was not reproducible ...

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