org.springframework.beans.TypeMismatchException：未能类型的属性值转换[$ Proxy133]所需类型

在applicationContext.xml我有一颗豆ems：

<bean id="ems" class="info.ems.EMSImpl" init-method="init"> 
    <property name="dao" ref="dao" /> 
    <property name="passwordEncoder" ref="passwordEncoder" /> 
    <property name="localeList" value="${ems.locales}" /> 
    <property name="releaseVersion" value="${ems.version}" /> 
    <property name="releaseTimestamp" value="${ems.timestamp}" /> 
    <property name="emsHome" value="${ems.home}" /> 
</bean>

现在的applicationContext-acegi.xml我引用该ems豆：

<bean id="authenticationManager" class="info.ems.config.ProviderManagerFactoryBean"> 
    <property name="emsImpl" ref="ems"/>   
    <property name="authenticationProvider" ref="authenticationProvider"/> 
</bean> 

<bean id="authenticationProvider" class="org.acegisecurity.providers.dao.DaoAuthenticationProvider"> 
    <property name="userDetailsService" ref="ems"/> 
    <property name="passwordEncoder" ref="passwordEncoder"/> 
</bean>

而且ProviderManagerFactoryBean.java：

public class ProviderManagerFactoryBean implements FactoryBean { 

    private final Logger logger = LoggerFactory.getLogger(getClass()); 

    private EMSImpl emsImpl; 
    private AuthenticationProvider authenticationProvider; 

    public void setEmsImpl(EMSImpl emsImpl) { 
     this.emsImpl = emsImpl; 
    } 

    public void setAuthenticationProvider(AuthenticationProvider authenticationProvider) { 
     this.authenticationProvider = authenticationProvider; 
    } 

      //other code 
}

但我收到此错误：

19:08:56,726 INFO [STDOUT] 2011-05-30 19:08:56,724 [ScannerThread] ERROR [org.springframework.web.context.ContextLoader] - Context initialization failed 
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'authenticationManager' defined in ServletContext resource [/WEB-INF/applicationContext-acegi.xml]: Error setting property values; nested exception is org.springframework.beans.PropertyBatchUpdateException; nested PropertyAccessExceptions (1) are: 
PropertyAccessException 1: org.springframework.beans.TypeMismatchException: Failed to convert property value of type [$Proxy133] to required type [info.ems.EMSImpl] for property 'emsImpl'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [$Proxy133] to required type [info.ems.EMSImpl] for property 'emsImpl': no matching editors or conversion strategy found

的EMSImpl实现了EMS。

@Service("emsImpl") 
@Transactional(readOnly = true) 
public class EMSImpl implements EMS { 
    //other code 
} 

public interface EMS extends UserDetailsService { 
    //other code 
}

我该如何解决这个问题？

感谢和问候。

来源

2011-05-30 Tapas Bose

你为什么不通过'EMS'接口引用你的对象。就我所知，这就是你应该做的。 – 2011-05-30 13:54:57

@Joachim绍尔你建议我在类ProviderManagerFactoryBean中使用EMS而不是EMSImpl？ – 2011-05-30 13:58:45

当Spring在EMSImpl周围创建事务代理对象时，它使代理在该类实现相同的一组接口（即EMS）。代理不会是EMSImpl类型。

在ProviderManagerFactoryBean中，您需要注入型号为EMS而不是EMSImpl。这也是很好的设计 - 它将你的类彼此分开，以便它们通过接口进行通信。

来源

2011-05-30 14:00:20 skaffman

org.springframework.beans.TypeMismatchException：未能类型的属性值转换[$ Proxy133]所需类型

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