jboss配置虚拟目录问题，帮忙看下？

我的发布目录结构是这样的
\jboss301\server\default\deploy\broker.ear\brokerweb.war

我修改了deploy目录下的tomcat4-service.xml 文件
<attribute name="Config">
<Server>
<Service name = "JBoss-Tomcat">
<Engine name="MainEngine" defaultHost="localhost">
<Logger className = "org.jboss.web.catalina.Log4jLogger"
verbosityLevel = "trace" category = "org.jboss.web.localhost.Engine"/>
<Host name="localhost">
<Valve className = "org.apache.catalina.valves.AccessLogValve"
prefix = "localhost_access" suffix = ".log"
pattern = "common" directory = "../server/default/log" />
<DefaultContext cookies = "true" crossContext = "true" override = "true" />

<Context path="/zming"
docBase="d:/tmp"
crossContext="true"
debug="0"
reloadable="true"
trusted="false" >
</Context>
</Host>

加入了
<Context path="/zming"
docBase="d:/tmp"
crossContext="true"
debug="0"
reloadable="true"
trusted="false" >
</Context>
的配置，可是不起作用，我该在那里配置呢？？