Exception shown at windows slave console during restart of tomcat

[Varghese Renny]

Hi,
   i am getting an exception at slave console while stoping and starting 
tomcat using ant task..
   How to resolve this error? Any other method i can use for starting and 
stoping tomcat ?

     Aug 15, 2012 2:46:53 AM hudson.Proc$LocalProc join
   WARNING: Process leaked file descriptors. See 
http://wiki.jenkins-ci.org/display
   /JENKINS/Spawning+processes+from+build for more information
   java.lang.Exception
        at hudson.Proc$LocalProc.join(Proc.java:329)
        at hudson.Launcher$RemoteLaunchCallable$1.join(Launcher.java:937)
        at sun.reflect.GeneratedMethodAccessor216.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
  sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at 
hudson.remoting.RemoteInvocationHandler$RPCRequest.perform(RemoteInvo
  cationHandler.java:274)
        at 
hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocat
  ionHandler.java:255)
        at 
hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocat
  ionHandler.java:215)
        at hudson.remoting.UserRequest.perform(UserRequest.java:118)
        at hudson.remoting.UserRequest.perform(UserRequest.java:48)
        at hudson.remoting.Request$2.run(Request.java:287)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:44
   1)
        at 
java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExec
  utor.java:886)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
   .java:908)
        at hudson.remoting.Engine$1$1.run(Engine.java:60)
        at java.lang.Thread.run(Thread.java:619)


Thanks in Advance,
varghese