null id in entry (don't flush the Session after an exception occurs)

錯誤提示：數據庫 org.hibernate.AssertionFailure: null id in com.youxue.domain.Question entry (don't flush the Session after an exception occurs)dom   解決方法：hibernate   遇到這個異常實屬不當心所致，最初看到異出的錯誤信息時我誤認爲是主鍵爲空所致。一着急

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