SipStackImpl problem

Hi, i have a problem when implementing SipStackImpl. My code
is:

sipFactory = SipFactory.getInstance();

properties = new Properties();
try
{
properties.setProperty("javax.sip.IP_ADDRESS",(InetAddress.getLocalHost()).getHostAddress());
}
catch(Exception
inetExc){System.out.println("error"+inetExc.toString());

properties.setProperty("javax.sip.TRANSPORT", "udp" );
properties.setProperty("javax.sip.OUTBOUND_PROXY",outBound);
properties.setProperty("gov.nist.javax.sip.THREAD_POOL_SIZE
","1000");
properties.setProperty("javax.sip.RETRANSMISSON_FILTER",
"ON");
properties.setProperty("javax.sip.AUTOMATIC_DIALOG_SUPPORT
", "true");
properties.setProperty("gov.nist.javax.sip.REENTRANT_LISTENER"
, "false");
properties.setProperty("gov.nist.javax.sip.MAX_SERVER_TRANSACTIONS"
,"100");
properties.setProperty("javax.sip.STACK_NAME",name);

try
{
sipStack=(SipStackImpl)sipFactory.createSipStack(properties);
}
catch(Exception
err){System.out.priintln("error"+err.toString());}

My output print:
WARNING: Instances of "gov.nist.javax.sip.SipStackImpl" will
NOT be finalized .

Why?what I can make ?my values are exact
Thanks