java org.springframework.beans.TypeMismatchException：无法将类型 [$Proxy133] 的属性值转换为所需类型
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org.springframework.beans.TypeMismatchException: Failed to convert property value of type [$Proxy133] to required type
提问by Tapas Bose
In the applicationContext.xml I have a bean ems:
在 applicationContext.xml 我有一个 bean 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>
Now in applicationContext-acegi.xml I am referencing that emsbean:
现在在 applicationContext-acegi.xml 中我引用了那个emsbean：
<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>
And the ProviderManagerFactoryBean.java:
和 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
}
But I am getting this error:
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
The EMSImpl implements EMS.
EMSImpl 实现了EMS。
@Service("emsImpl")
@Transactional(readOnly = true)
public class EMSImpl implements EMS {
//other code
}
public interface EMS extends UserDetailsService {
//other code
}
How can I solve this?
我该如何解决这个问题？
Thanks and regards.
谢谢并恭祝安康。
回答by skaffman
When Spring creates the transactional proxy object around EMSImpl, it makes the proxy implement the same set of interfaces at that class (i.e. EMS). The proxy will not, however, be of type EMSImpl.
当 Spring 在 周围创建事务代理对象时EMSImpl，它使代理在该类（即EMS）上实现相同的接口集。但是，代理将不是 类型EMSImpl。
In ProviderManagerFactoryBean, you need to inject type type EMS, not EMSImpl. This is also good design - it decouples your classes from each other, so that they communicate via interfaces.
在 中ProviderManagerFactoryBean，您需要注入类型 type EMS，而不是EMSImpl. 这也是一个很好的设计 - 它使您的类彼此分离，以便它们通过接口进行通信。
