搭建的ssm框架，加入了数据源之后启动就报错了,求解

[lgczdy]

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'viContestDao' defined in file [D:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\CloudCn-VI\WEB-INF\classes\com\cloudcn\dao\ViContest\ViContestDao.class]: Cannot resolve reference to bean 'sqlSessionFactory' while setting bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [spring-mybatis.xml]: Cannot resolve reference to bean 'dataSource' while setting bean property 'dataSource'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [spring-mybatis.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'maxPoolSize' of bean class [org.apache.commons.dbcp.BasicDataSource]: Bean property 'maxPoolSize' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?