compass 日期及关联对象问题

Question

我A对象包含B对象，1：N关系，配置不知道出了什么问题 。报错 org.compass.core.mapping.MappingException: Failed to resolve ref-alias [serviceProjectBean] for [serviceProjectBeans] in alias [serviceUserBean]  <?xml version="1.0"?>
<!DOCTYPE compass-core-meta-data PUBLIC 
    "-//Compass/Compass Core Meta Data DTD 1.0//EN"
    "http://www.opensymphony.com/compass/dtd/compass-core-meta-data.dtd"><compass-core-meta-data>    <meta-data-group id="config" displayName="config Meta Data">
    
        <description>Library Meta Data</description>       
        <uri>http://compass/sample/library/beans</uri>
        
              <alias id="serviceUserBean" displayName="ServiceUserBean">
            <description>serviceUserBean alias</description>
            <uri>http://beans</uri>
            <name>serviceUserBean</name> 
        </alias>
         <alias id="serviceProjectBean" displayName="ServiceProjectBean">
            <description>serviceProjectBean alias</description>
            <uri>http://beans</uri>
            <name>serviceProjectBean</name> 
        </alias>
        
    </meta-data-group>
    
</compass-core-meta-data><?xml version="1.0"?>
<!DOCTYPE compass-core-mapping PUBLIC 
    "-//Compass/Compass Core Mapping DTD 1.0//EN"
    "http://www.opensymphony.com/compass/dtd/compass-core-mapping.dtd"><compass-core-mapping package="beans">    <class name="ServiceProjectBean" alias="${config.serviceProjectBean}">
    
        
  
        <!-- 你可以通过这个配置来在底层给这个对象加一个Field("type","java") -->  
  
        <id name="id" />
  
        <!-- 配置一下属性 -->  
  
        <property name="projectName">  
  
            <meta-data>projectNameIndex</meta-data>  
  
        </property> 
        <property name="feeExplain">
         <meta-data>feeExplainIndex</meta-data>
        </property>
   <property name="serviceExplain">
         <meta-data>serviceExplainIndex</meta-data>
        </property>
       
    
    </class>
    
</compass-core-mapping>
<?xml version="1.0"?>
<!DOCTYPE compass-core-mapping PUBLIC 
    "-//Compass/Compass Core Mapping DTD 1.0//EN"
    "http://www.opensymphony.com/compass/dtd/compass-core-mapping.dtd"><compass-core-mapping package="beans">    <class name="ServiceUserBean" alias="${config.serviceUserBean}">
    
        
  
    
  
        <id name="id" />
  
        <!-- 配置一下属性 -->  
  
        <property name="serviceName">  
  
            <meta-data>serviceNameIndex</meta-data>  
  
        </property> 
        <property name="area">
         <meta-data>areaIndex</meta-data>
        </property>
   <property name="tese">
         <meta-data>areaIndex</meta-data>
        </property>
       
     <reference name="serviceProjectBeans" ref-alias="${config.serviceProjectBean}" />
    </class>
    
</compass-core-mapping>