[SNMP4J] Null Pointer Exception in DefaultTcpTransportMapping.close()

[Prusi, Jesse R]

Hello,

I'm using SNMP4J 1.7.3 on a Windows XP machine.

I find a get a Null Pointer Exception when snmp.close().  Here is my
sample code:

public class SnmpTest {

	public static void main(String[] args) {
		try{
			DefaultTcpTransportMapping myTransport = new
DefaultTcpTransportMapping(
					new
TcpAddress(InetAddress.getLocalHost(),
							10163));
			myTransport.setMaxInboundMessageSize(1400);
			myTransport.setConnectionTimeout(1000);
			
			Snmp snmp = new Snmp(myTransport);
			OctetString localEngineId = new
OctetString(MPv3.createLocalEngineID());
			USM usm = new
USM(SecurityProtocols.getInstance(), localEngineId, 0);
	
SecurityModels.getInstance().addSecurityModel(usm);
			snmp.listen();
			System.out.println("Listening on port 10163");
			for(int i=0; i < 10000; i++){
				System.out.println("spinning " + i);
			}
			snmp.close();
			System.out.println("Closed Snmp Session");
		}
		catch(Exception e){
			e.printStackTrace();
		}
	}
}

I get the following stack trace:

java.lang.NullPointerException
	at
org.snmp4j.transport.DefaultTcpTransportMapping.close(DefaultTcpTranspor
tMapping.java:186)
	at org.snmp4j.Snmp.close(Snmp.java:429)
	at SnmpTest.main(SnmpTest.java:31)

The NPE does not occur if I comment out the spinning for loop.  I
thought this might have something to do with the timeout setting of the
TCP transport mapping, but I still get the error after increasing the
timeout to 10000.  Any ideas why this is occurring?  Am I using the TCP
transport mapping incorrectly?

Thanks,  

Jesse Prusi