I am using the simple ear file found at
http://www.roseindia.net/jboss/anttutorialcode.zip and constantly redeploying it with something like this

@ECHO OFF
cls
SET COUNT=0
SET PATH=E:\tools\apache-ant-1.6.5\bin;%PATH%
set SERVLET_LIB_JAR=E:\tools\Maven\repository\servletapi\jars\servletapi-2.3.jar
:Loop
call touch E:\dev\anttutorialcode\anttest\example2\src\HelloWorld.java
call ant
rem xcopy /f /y example2.ear E:\server\jboss-4.0.2\server\default\deploy >nul:
xcopy /f /y example2.ear E:\server\jboss-4.0.4.GA\server\default\deploy >nul:
SET /A COUNT=COUNT+1
echo Deployed EAR file count is %COUNT%, sleeping 30 secs...
sleep 30
goto Loop

There is a leak of 1mb every few minutes!