java - Scala Spring IoC 和 JSF

Question

我遇到了一个 Spring 注入(inject)问题，我已经尝试解决了 4 天，但没有任何进展:

在我的 spring 配置中，我有:

<bean id="applicationCache" class="domain.ui.ApplicationCacheServiceImpl">
    <property name="divisionSelectOptionsCache" ref="divisionSelectOptionsCache"/>
</bean>

<bean id="divisionSelectOptionsCache" class="domain.jsf.DivisionSelectOptionsCache"></bean>

ApplicationCacheServiceImpl.scala 如下所示:

class ApplicationCacheServiceImpl extends ApplicationCacheService{
   var divisionSelectOptionsCache: DivisionSelectOptionsCache = _

   def setDivisionSelectOptionsCache(dsoc: DivisionSelectOptionsCache) ={
     divisionSelectOptionsCache = dsoc
   }
 ....

DivisionSelectOptionsCache.scala 如下所示:

class DivisionSelectOptionsCache extends Converter{
   val options = mutable.Map[String, DivisionSelectOption]()
   var em: EntityManager = _

   // Just left this in case its  relevant. Throws no errors though
   @PersistenceContext
   def setEntityManager(entManager: EntityManager) = {
      em = entManager
   }
   ....

应用程序编译并构建 war 。但是，当我部署它时，我收到以下异常消息:

INFO: Initializing Spring root WebApplicationContext
Jan 18, 2013 7:56:17 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'applicationCache' defined in class path resource 
applicationPersistence.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: 
Failed to convert property value of type '$Proxy15 implementing javax.faces.convert.Converter,org.springframework.aop.SpringProxy,
org.springframework.aop.framework.Advised' to required type 'com.domain.jsf.DivisionSelectOptionsCache' 
for property 'divisionSelectOptionsCache'; nested exception is java.lang.IllegalStateException: 
Cannot convert value of type [$Proxy15 implementing javax.faces.convert.Converter,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised]
 to required type [com.domain.jsf.DivisionSelectOptionsCache] for property 'divisionSelectOptionsCache': no matching editors or conversion strategy found
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:527)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
  at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
  at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
 .....
Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type '$Proxy15 implementing javax.faces.convert.Converter,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised' to required type 'com.domain.jsf.DivisionSelectOptionsCache' for property 'divisionSelectOptionsCache'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [$Proxy15 implementing javax.faces.convert.Converter,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [com.domain.jsf.DivisionSelectOptionsCache] for property 'divisionSelectOptionsCache': no matching editors or conversion strategy found
  at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:485)
  at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:516)
....
Caused by: java.lang.IllegalStateException: Cannot convert value of type [$Proxy15 implementing javax.faces.convert.Converter,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [com.domain.jsf.DivisionSelectOptionsCache] for property 'divisionSelectOptionsCache': no matching editors or conversion strategy found
  at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:247)
  at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:470)
  ... 31 more

Jan 18, 2013 7:56:20 PM org.apache.catalina.core.StandardContext filterStop
FINE: Stopping filters

所以:ApplicationCacheServiceImpl 正在寻找 spring 将与 DivisionSelectOptionsCache 对应的类型注入(inject)到属性 divisionSelectOptionsCache 中，这是正确的，并且如 spring 配置 xml 文件中所定义。

类DivisionSelectOptionsCache extends Converter所以那里应该不会有问题。

所以我被困住了。我什至尝试取出 spring IoC 并使用 google Guice 进行编译时间检查而不是部署时间检查(没有 xml 配置文件)，但这不起作用，因为应用程序依赖于 Spring 来提供托管 jsf beans。/p>

请帮忙，因为我正要告诉客户这是不可能的。

谢谢

Answer 1

使用类似 http://java.decompiler.free.fr/ 中的反编译器检查 Scala 编译器生成的字节码。它很可能没有按照您的想法行事。