org.hibernate.MappingException: Dialect does not support identity key generation异常

14:35:25,806 ERROR [[default]] Servlet.service() for servlet default threw exception
org.hibernate.MappingException: Dialect does not support identity key generation
 at org.hibernate.dialect.Dialect.getIdentitySelectString(Dialect.java:526)
 at org.hibernate.dialect.Dialect.getIdentitySelectString(Dialect.java:515)
 at org.hibernate.persister.entity.AbstractEntityPersister.getIdentitySelectString(AbstractEntityPersister.java:2163)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at com.googlecode.jsonplugin.JSONWriter.bean(JSONWriter.java:224)
 at com.googlecode.jsonplugin.JSONWriter.process(JSONWriter.java:161)
 at com.googlecode.jsonplugin.JSONWriter.value(JSONWriter.java:127)
 at com.googlecode.jsonplugin.JSONWriter.map(JSONWriter.java:363)
 at com.googlecode.jsonplugin.JSONWriter.process(JSONWriter.java:147)
 at com.googlecode.jsonplugin.JSONWriter.value(JSONWriter.java:127)
 at com.googlecode.jsonplugin.JSONWriter.add(JSONWriter.java:323)
 at com.googlecode.jsonplugin.JSONWriter.bean(JSONWriter.java:225)
 at com.googlecode.jsonplugin.JSONWriter.process(JSONWriter.java:161)
 at com.googlecode.jsonplugin.JSONWriter.value(JSONWriter.java:127)
 at com.googlecode.jsonplugin.JSONWriter.add(JSONWriter.java:323)

 

1.json会返回action里有getter方法的属性，但有些不用返回给前台，故在get方法上面加：@JSON(serialize = false)：不让其串行，序列化 。

2.记得在applicationContext-dao.xml文件中写入：<property name="dao"                 ref="DemoDAO"      ></property>