将Spring bean注入到JSF中时出错ManagedBean

Question

我有一个JSF ManagedBean，它有一个应该由Spring设置的属性。但是，我收到以下错误：

Caused by: javax.el.ELException: java.lang.IllegalArgumentException: Cannot convert persistence.AuthDao@2f6e6ad9 of type class $Proxy166 to class persistence.AuthDao 
at com.sun.el.ExpressionFactoryImpl.coerceToType(ExpressionFactoryImpl.java:68) 
at com.sun.faces.el.ELUtils.coerce(ELUtils.java:536) 
at com.sun.faces.mgbean.BeanBuilder$Expression.evaluate(BeanBuilder.java:592) 
at com.sun.faces.mgbean.ManagedBeanBuilder$BakedBeanProperty.set(ManagedBeanBuilder.java:606) 
... 57 more 
Caused by: java.lang.IllegalArgumentException: Cannot convert persistence.AuthDao@2f6e6ad9 of type class $Proxy166 to class persistence.AuthDao 
at com.sun.el.lang.ELSupport.coerceToType(ELSupport.java:397) 
at com.sun.el.ExpressionFactoryImpl.coerceToType(ExpressionFactoryImpl.java:66) 

我在faces-config.xml中有ELresolver。

<managed-bean> 
    <managed-bean-name>authController</managed-bean-name> 
    <managed-bean-class>controllers.AuthController</managed-bean-class> 
    <managed-bean-scope>session</managed-bean-scope> 
    <managed-property> 
     <property-name>authDao</property-name> 
     <value>#{authDao}</value> 
    </managed-property> 
</managed-bean> 

<application> 
    <el-resolver>org.springframework.web.jsf.el.SpringBeanFacesELResolver</el-resolver> 
</application> 

它似乎可以找到类，但该类是另一种类型（$ Proxy166 ?,不知道从哪里来的）。

PS：删除ELResolver似乎有窍门;我以为明确提供faces-config.xml中的托管bean将覆盖ELResolver。那么这两种方式是否有共存？同样，如果我为bean提供注释和XML配置，哪一个是首选项，或者是否有合并它们的方法，请在注释中提供一些属性，其中一些属性使用XML？

PPS：添加接口和改变我目前的类来实现他们后，我得到以下错误：

Error occurred during deployment: Exception while loading the app : java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'authDao' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type '$Proxy157 implementing persistence.UserDao,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised' to required type 'persistence.UserDaoImpl' for property 'userDao'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [$Proxy157 implementing persistence.UserDao,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [persistence.UserDaoImpl] for property 'userDao': no matching editors or conversion strategy found. Please see server.log for more details.

Answer 1

这是你的类的代理。你正在实现一个接口，所以Spring会在接口周围创建一个代理，但是你正在尝试按具体类型注入。改为切换到界面（在托管bean中）。

如果你真的需要出于某种原因由具体类注入时，可以使用@Scoped(proxyMode=ScopeProxyMode.TARGET_CLASS)