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分享spring mybaits项目中，在一个普通的类中继承ApplicationListener，为什么项目启动时会报空指针异常？
service实现类的代码如下所示：
@Service
public class CodeServiceImpl implements BaseInterface {
private BaseDao dao;
@Override
public Code getCode() {
return (Code) dao.selectOne("code.selectList");
}
public void setDao(BaseDao dao) {
this.dao = dao;
}
}
类中的代码第一幅图所示：
其中baseDao是封装的mybaits操作数据库的方法
applicationContext.xml中关于mybaits的整合如下所示：
<!-- spring与mybatis整合配置，扫描所有dao -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" p:basePackage="com.liwc.liwcshop.web.dao"
p:sqlSessionFactoryBeanName="sqlSessionFactory"/>
报错如第二幅图所示：
@Service
public class CodeServiceImpl implements BaseInterface {
private BaseDao dao;
@Override
public Code getCode() {
return (Code) dao.selectOne("code.selectList");
}
public void setDao(BaseDao dao) {
this.dao = dao;
}
}
类中的代码第一幅图所示：
其中baseDao是封装的mybaits操作数据库的方法
applicationContext.xml中关于mybaits的整合如下所示：
<!-- spring与mybatis整合配置，扫描所有dao -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" p:basePackage="com.liwc.liwcshop.web.dao"
p:sqlSessionFactoryBeanName="sqlSessionFactory"/>
报错如第二幅图所示：
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「已注销」 2016-07-13
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还是不行，但是加上static就可以，不知道是为什么。。还有就是在SystemMBean中怎么使用session
尼古拉斯-全蛋 2016-07-12
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@Service
public class CodeServiceImpl implements BaseInterface {
@Autowired(
private BaseDao dao;
加在这里，不是加在dao接口上
「已注销」 2016-07-11
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不行，我试过了尼古拉斯-全蛋 2016-07-11
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dao上边加注解注入
「已注销」 2016-07-11
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不行，我试过了[/quote]
[/quote]加上那个注解，好像报错了[/quote]
报如下的错误：
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'codeServiceImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.liwc.liwcshop.web.util.dao.BaseDao com.liwc.liwcshop.web.util.service.impl.CodeServiceImpl.dao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.liwc.liwcshop.web.util.dao.BaseDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1014)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:957)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:855)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:480)
... 58 more
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.liwc.liwcshop.web.util.dao.BaseDao com.liwc.liwcshop.web.util.service.impl.CodeServiceImpl.dao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.liwc.liwcshop.web.util.dao.BaseDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
... 69 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.liwc.liwcshop.web.util.dao.BaseDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1100)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:960)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:855)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:480)
... 71 more「已注销」 2016-07-11
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不行，我试过了[/quote][/quote]加上那个注解，好像报错了尼古拉斯-全蛋 2016-07-11
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不行，我试过了[/quote]
