thanks to danch, when I use Jboss2.1 beta, all of things are OK. thanks to Ken Jenks. in addition: Perhaps it is a silly problem. I want to know why the file "jboss.conf" and other likewise ***.conf files use the format of XML? but when I comment this line in jboss.conf like this: <MLET CODE = "org.jboss.util.ClassPathExtension" ARCHIVE="jboss.jar" CODEBASE="../../lib/ext/"> <!-- Comment by Sam Liu <ARG TYPE="java.lang.String" VALUE="../../../jakarta-tomcat-3.2.1/lib/"> --> <ARG TYPE="java.lang.String" VALUE="../../../tomcat/lib/"> <ARG TYPE="java.lang.String" VALUE="Tomcat"> </MLET> i found that jboss can not start up tomcat. that is to say ***.conf do NOT support XML parsering. when I correct it like this: <MLET CODE = "org.jboss.util.ClassPathExtension" ARCHIVE="jboss.jar" CODEBASE="../../lib/ext/"> <!-- ARG TYPE="java.lang.String" VALUE="../../../jakarta-tomcat-3.2.1/lib/" --> <ARG TYPE="java.lang.String" VALUE="../../../tomcat/lib/"> <ARG TYPE="java.lang.String" VALUE="Tomcat"> </MLET> it is OK. So, if all of the files of "***.conf" can be parsered on html or xml format, perhaps is it better? ------- origional info---------- First, I assume you're running JBoss 2.0? If you're running 2.1/2.2, the config is a little different. ........... ,ǫx%I,ǫ+-.ǟaX(~zwXb?,