Java Spring找不到接口的实现
我是Spring新手,正在尝试使用它在我的项目中注入DAO依赖项Java Spring找不到接口的实现,java,spring,Java,Spring,我是Spring新手,正在尝试使用它在我的项目中注入DAO依赖项 ... <bean id="myPlugin" class="package.to.my.plugin.MyPlugin"> <property name="myDAO" > <ref bean="MyDao"/> </property> </bean> 我有一个界面: ... <bean id="myPlugin"
...
<bean id="myPlugin" class="package.to.my.plugin.MyPlugin">
<property name="myDAO" >
<ref bean="MyDao"/>
</property>
</bean>
我有一个界面:
...
<bean id="myPlugin" class="package.to.my.plugin.MyPlugin">
<property name="myDAO" >
<ref bean="MyDao"/>
</property>
</bean>
MyDao.java
...
<bean id="myPlugin" class="package.to.my.plugin.MyPlugin">
<property name="myDAO" >
<ref bean="MyDao"/>
</property>
</bean>
在我的xml文件中,我有以下内容:
<bean id="MyDao" class="path.to.my.dao.impl.MyDaoImpl">
<!-- assume emf is OK: entity manager factory provided by spring -->
<property="emf" value="emFactory" />
</bean>
...
<bean id="myPlugin" class="path.to.my.plugin.MyPlugin">
<property="myDAO" value="MyDao" />
</bean>
...
<bean id="myPlugin" class="package.to.my.plugin.MyPlugin">
<property name="myDAO" >
<ref bean="MyDao"/>
</property>
</bean>
...
当我尝试运行时,出现以下错误:
...
<bean id="myPlugin" class="package.to.my.plugin.MyPlugin">
<property name="myDAO" >
<ref bean="MyDao"/>
</property>
</bean>
找不到在ServletContextResource中定义的名为“MyDao”的bean的类[path.to.my.dao.impl.MyDaoImpl]
...
<bean id="myPlugin" class="package.to.my.plugin.MyPlugin">
<property name="myDAO" >
<ref bean="MyDao"/>
</property>
</bean>
为什么spring找不到MyDao接口的实现?此模式在我的项目中使用,但对于我尝试执行的注入似乎不起作用。假设
MyDaoImpl
存在于path.to.my.dao.impl.MyDaoImpl
中,有两种方法可以解决此问题:
...
<bean id="myPlugin" class="package.to.my.plugin.MyPlugin">
<property name="myDAO" >
<ref bean="MyDao"/>
</property>
</bean>
首先,
在配置文件中修改myPlugin
bean,如下所示:
<bean id="myPlugin" class="package.to.my.plugin.MyPlugin">
</bean>
package path.to.my.plugin;
// ...
private MyDao myDAO;
//setter and getter for myDAO
// ...
...
<bean id="myPlugin" class="package.to.my.plugin.MyPlugin">
<property name="myDAO" >
<ref bean="MyDao"/>
</property>
</bean>
另外,在配置文件中修改myPlugin
bean,如下所示:
...
<bean id="myPlugin" class="package.to.my.plugin.MyPlugin">
<property name="myDAO" >
<ref bean="MyDao"/>
</property>
</bean>
。。。
假设MyDaoImpl
存在于path.to.my.dao.impl.MyDaoImpl
中,有两种方法可以解决此问题:
...
<bean id="myPlugin" class="package.to.my.plugin.MyPlugin">
<property name="myDAO" >
<ref bean="MyDao"/>
</property>
</bean>
首先,
在配置文件中修改myPlugin
bean,如下所示:
<bean id="myPlugin" class="package.to.my.plugin.MyPlugin">
</bean>
package path.to.my.plugin;
// ...
private MyDao myDAO;
//setter and getter for myDAO
// ...
...
<bean id="myPlugin" class="package.to.my.plugin.MyPlugin">
<property name="myDAO" >
<ref bean="MyDao"/>
</property>
</bean>
另外,在配置文件中修改myPlugin
bean,如下所示:
...
<bean id="myPlugin" class="package.to.my.plugin.MyPlugin">
<property name="myDAO" >
<ref bean="MyDao"/>
</property>
</bean>
。。。
类似乎不在类路径上。MyDaoImpl上不应该有@Repository注释吗???@WeareBorg只有在组件扫描时才有。类似乎不在类路径上。MyDaoImpl上不应该有@Repository注释吗???@WeareBorg只有在组件扫描时才有。这些是互斥的解决方案吗?看起来不是。这些不是相互排斥的解决方案。这些是相互排斥的解决方案吗?看起来不是这样。这些不是相互排斥的解决方案。