spring 框架 在Tomcat5.0正常 升級到Tomcat 5.5 出現不能配置Spring 數據源問題

Tomcat5.0 + Spring2.x 這個結構已經使用了 1年多非常穩定。 
但是在Tomcat5.5下卻不能運行。 
dataAccess.bean.xml 配置(節選)：----------------------------------------------------- 

<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> 
<property name="locations"> 
<list> 
<value>classpath:/config/init.properties </value> 
</list> 
</property> 
</bean> 
<!-- DataSource Definition --> 
<bean id="dataSource" 
class="org.apache.commons.dbcp.BasicDataSource" 
destroy-method="close"> 
<property name="driverClassName"> 
<value>${datasource.driverClassName} </value> 
</property> 
<property name="url"> 
<value>${datasource.url} </value> 
</property> 
<property name="username"> 
<value>${datasource.username} </value> 
</property> 
<property name="password"> 
<value>${datasource.password} </value> 
</property> 
<property name="maxActive"> 
<value>${datasource.maxActive} </value> 
</property> 
<property name="maxIdle"> 
<value>${datasource.maxIdle} </value> 
</property> 
</bean> 

----------------------------------------------------------------- 
init.properties文件內容(節選)： 
hibernate.dialect=org.hibernate.dialect.SybaseDialect 
datasource.driverClassName=com.sybase.jdbc3.jdbc.SybDriver 
datasource.url=jdbc:sybase:Tds:192.168.0.1:7100/aa?charset=eucgb 
datasource.username=aa 
datasource.password=aa 

#數據庫連接池子大小 
datasource.maxActive=50 
datasource.maxIdle=5 
datasource.maxWait=2400 

=============================================================== 
問題: 
1,在 Eclipse下選擇正常 
2,在 tomcat5.0下選擇正常 

3,在 tomcat5.5下錯誤： 
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bea 
n with name 'sessionFactory' defined in URL [jar:file:/D:/interfacework/apache-tomcat- 
5.5.27/apache-tomcat-5.5.27/webapps/web98xx2/WEB-INF/lib/wfec_framework.jar!/config/da 
taAccess.bean.xml]: Cannot resolve reference to bean 'dataSource' while setting bean p 
roperty 'dataSource'; nested exception is org.springframework.beans.factory.BeanCreati 
onException: Error creating bean with name 'dataSource' defined in URL [jar:file:/D:/i 
nterfacework/apache-tomcat-5.5.27/apache-tomcat-5.5.27/webapps/web98xx2/WEB-INF/lib/wf 
ec_framework.jar!/config/dataAccess.bean.xml]: Initialization of bean failed; nested e 
xception is org.springframework.beans.TypeMismatchException: Failed to convert propert 
y value of type [java.lang.String] to required type [int] for property 'maxActive'; ne 
sted exception is java.lang.NumberFormatException: For input string: "" 
        at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resol 
veReference(BeanDefinitionValueResolver.java:275) 

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我查google了一個上午始終沒解決