[ERROR] [2012-59-30 05:59:28] org.hibernate.AssertionFailure.<init>(AssertionFailure.java:45) -an a

[ERROR] [2012-59-30 05:59:28] org.hibernate.AssertionFailure.<init>(AssertionFailure.java:45)

-an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session)

org.hibernate.AssertionFailure: null identifier

个人浅见：是由于我的主键没有默认值，导致主键为NULL，大家可以予以借鉴