mybatis在插入的时候，获取安插主键报错 T_T

mybatis在插入的时候，获取插入主键报错 T_T
这是配置

<insert id="insert" parameterType="com.imad.po.UserInfo" useGeneratedKeys="true" keyProperty="uId">
	insert into tbl_UserInfo(uUserName,uPassword)
	values(#{uUserName},#{uPassword})
</insert>

数据库中的表是

create table tbl_UserInfo(
    uId int primary key auto_increment,
    uUserName varchar(255),
    uPassword varchar(255)
);

如果去掉

useGeneratedKeys="true" keyProperty="uId"

没有任何问题，将【uId】，换成了【uID】也不会报错

但是加上的话，会报错。。。差了半天没有找到原因

Exception in thread "AWT-EventQueue-0" org.springframework.jdbc.BadSqlGrammarException: Error getting generated key or setting result to parameter object. Cause: java.sql.SQLException: Column 'null' not found.
; bad SQL grammar []; nested exception is java.sql.SQLException: Column 'null' not found.
	at org.springframework.jdbc.support.SQLStateSQLExceptionTranslator.doTranslate(SQLStateSQLExceptionTranslator.java:98)
	at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
	at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)
	at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)
	at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:71)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:346)
	at $Proxy3.insert(Unknown Source)
	at org.mybatis.spring.SqlSessionTemplate.insert(SqlSessionTemplate.java:231)
	at com.imad.dao.UserInfoDAO.insert(UserInfoDAO.java:71)
	at com.imad.service.UserInfoService.insert(UserInfoService.java:56)
	at com.imad.ui.ExRegister.doActionOnBtnNextClicked(ExRegister.java:159)
	at com.imad.ui.ExRegister.access$2(ExRegister.java:146)
	at com.imad.ui.ExRegister$3.mouseClicked(ExRegister.java:110)
	at java.awt.AWTEventMulticaster.mouseClicked(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.sql.SQLException: Column 'null' not found.
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:910)
	at com.mysql.jdbc.ResultSet.findColumn(ResultSet.java:961)
	at com.mysql.jdbc.ResultSet.getInt(ResultSet.java:2422)
	at org.apache.ibatis.type.IntegerTypeHandler.getNullableResult(IntegerTypeHandler.java:17)
	at org.apache.ibatis.type.BaseTypeHandler.getResult(BaseTypeHandler.java:29)
	at org.apache.ibatis.executor.keygen.Jdbc3KeyGenerator.processAfter(Jdbc3KeyGenerator.java:50)
	at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:26)
	at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:51)
	at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:29)
	at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:88)
	at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:43)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:121)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:110)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:338)
	... 28 more

MODEL中有setter个getter啊，自动生成的T_T，