但仅仅是warn，而不是error。在tomcat 运行时，又是正常的，控制台不报提示。
为什么调试时会 出现warn，而运行时，没有出现提示，且能正常运行，不发生错误。
下面是debug时，具体显示的信息。
我花了很多时间找不到原因。
WARN o.s.b.f.s.DefaultListableBeanFactory - Bean creation exception on FactoryBean type check:
org.springframework.beans.factory.UnsatisfiedDependencyException:
Error creating bean with name 'biProductStandardItemDao'
defined in URL [jar:file:/D:/apache-tomcat-7.0.99/webapps/crm_service_web_war/WEB-INF/lib/
crm-service-business-1.0-SNAPSHOT.jar!/crm/core/quality/dao/BiProductStandardItemDao.class]:
Unsatisfied dependency expressed through bean property 'sqlSessionFactory': :
Error creating bean with name 'sqlSessionFactory' defined in class path resource [conf/spring/spring-datasource.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 [conf/spring/spring-datasource.xml]:
Invocation of init method failed; nested exception is java.lang.StackOverflowError;
nested exception is org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'sqlSessionFactory' defined in class path resource [conf/spring/spring-datasource.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 [conf/spring/spring-datasource.xml]:
Invocation of init method failed;
nested exception is java.lang.StackOverflowError
