原文:com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry 'admin' for key 'UK_dgxl7aijrr4hq8314exhw407s'

嚴重: Servlet.service for servlet spring mvc in context with path learn threw exception Request processing failed nested exception is org.hibernate.exception.ConstraintViolationException: could not exec ...

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