出现这个异常 —— Unable to instantiate default tuplizer ，是 Hibernate 的映射文件（*.hbm.xml）导致的。仔细检查一下工程里的映射文件吧。
笔者遇见上述异常的原因是，在使用联合主键时，那个主键类没有实现接口 java.io.Serializable
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