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POSpring 3 DI using generic DAO interface
 

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  1. POSpring 3 DI using generic DAO interface
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    <p>I'm trying to use @Autowired annotation with my generic Dao interface like this:</p> <pre><code>public interface DaoContainer&lt;E extends DomainObject&gt; { public int numberOfItems(); // Other methods omitted for brevity } </code></pre> <p>I use this interface in my Controller in following fashion:</p> <pre><code>@Configurable public class HelloWorld { @Autowired private DaoContainer&lt;Notification&gt; notificationContainer; @Autowired private DaoContainer&lt;User&gt; userContainer; // Implementation omitted for brevity } </code></pre> <p>I've configured my application context with following configuration</p> <pre><code>&lt;context:spring-configured /&gt; &lt;context:component-scan base-package="com.organization.sample"&gt; &lt;context:exclude-filter expression="org.springframework.stereotype.Controller" type="annotation" /&gt; &lt;/context:component-scan&gt; &lt;tx:annotation-driven /&gt; </code></pre> <p>This works only partially, since Spring creates and injects only one instance of my DaoContainer, namely DaoContainer. In other words, if I ask userContainer.numberOfItems(); I get the number of notificationContainer.numberOfItems()</p> <p>I've tried to use strongly typed interfaces to mark the correct implementation like this:</p> <pre><code>public interface NotificationContainer extends DaoContainer&lt;Notification&gt; { } public interface UserContainer extends DaoContainer&lt;User&gt; { } </code></pre> <p>And then used these interfaces like this:</p> <pre><code>@Configurable public class HelloWorld { @Autowired private NotificationContainer notificationContainer; @Autowired private UserContainer userContainer; // Implementation omitted... } </code></pre> <p>Sadly this fails to BeanCreationException:</p> <pre><code>org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.organization.sample.dao.NotificationContainer com.organization.sample.HelloWorld.notificationContainer; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.organization.sample.NotificationContainer] 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)} </code></pre> <p>Now, I'm a little confused how should I proceed or is using multiple Dao's even possible. Any help would be greatly appreciated :)</p>
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    1. COI don't see any implementation classes for your interfaces. How many are there, and what do they look like?
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      1. USskaffman
    2. COI didn't have explicit implementations for the interfaces, since I was hoping I could use generic dao class (i.e. DaoContainer<E extends DomainObject>). I could create explicit implementations (as Espen pointed out in his answer). That just doesn't feel reasonable, since I'm trying to take advantage Java generics as much as possible. However, I do have DaoContainerImpl<E extends DomainObject>.
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    3. COmaybe http://stackoverflow.com/questions/502994/spring-ioc-and-generic-interface-type/511417#511417 is a solution
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      1. USMichael Pralow
 

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