primary key's generator in JPA entity

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1.How to configure primary key‘s generator in JPA entity for oracle
2.jpa-primary-key-auto-generate
3.how-to-generate-primary-keys-with-jpa
4.[JPA(五) 主键生成策略](https://blog.csdn.net/houysx/article/details/80726742)




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ERROR 1062 (23000): Duplicate entry for key 'PRIMARY'

Duplicate entry 'xxx' for key 'PRIMARY'

Duplicate entry '...' for key 'PRIMARY

Duplicate entry '0' for key 'PRIMARY'

mysql Duplicate entry '9223372036854775807' for key 'PRIMARY'

[Err] 1062 - Duplicate entry '1' for key 'PRIMARY'