java - Why I can't success when I set spring.profiles.active in web.xml -

i have server data sources, use profile in spring3.1, web.xml:

<context-param>         <param-name>contextconfiglocation</param-name>         <param-value>classpath:applicationcontext.xml,classpath:applicationcontext-dao.xml,classpath:sqlmapconfig.xml</param-value>     </context-param>      <context-param>         <param-name>spring.profiles.active</param-name>         <param-value>test</param-value>     </context-param>      <listener>         <listener-class>org.springframework.web.context.contextloaderlistener</listener-class>     </listener> 

and applicationcontext.xml:

<beans profile="develop">     <context:property-placeholder location="classpath:develop.properties"/> </beans> <beans profile="test">     <context:property-placeholder location="classpath:test.properties"/> </beans> 

but doesn't work, can't value of spring.profiles.active, in servelet:

log.debug("spring.profiles.active" +  system.getproperty("spring.profiles.active")); 

this log null, : servletcontext sc=this.getservletcontext(); log.error(sc.getinitparameter("spring.profiles.active")); log value of spring.profiles.active configure in web.xml, can me, lot.