NonUniqueObjectException: A different object with the same identifier value was already associated
org.springframework.dao.DuplicateKeyException: A different object with the same identifier value was already associated with the session : [com.chuai.pojo.Department#14]; nested exception is org.hibernate.NonUniqueObjectException: A different object with the same identifier value was already associated with the session : [com.chuai.pojo.Department#14]
解決：
使用ssh框架進行update()操作的時候，出現id被佔用的情況，查詢資料得知是hibernate一級快取的緣故，可在update之前，去dao層呼叫clera()方法清除session
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