Error on SNMP Java Client Application

[sreekandank]

I have written the following SNMP client code to display the hardware information

import java.io.IOException;
import org.snmp4j.CommunityTarget;
import org.snmp4j.PDU;
import org.snmp4j.Snmp;
import org.snmp4j.Target;
import org.snmp4j.TransportMapping;
import org.snmp4j.event.ResponseEvent;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.smi.Address;
import org.snmp4j.smi.GenericAddress;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.VariableBinding;
import org.snmp4j.transport.DefaultUdpTransportMapping;
public class SNMPManager
{
 Snmp snmp=null;
 String address=null;
 public SNMPManager(String add)
 {
  address=add;
 }
 public static void main(String[] args)throws IOException
 {
  SNMPManager client=new SNMPManager("udp:127.0.0.1/161");
  client.start();
  String sysDescr=client.getAsString(new OID(".1.3.6.1.2.1.1.1.0"));
  System.out.println(sysDescr);
 }
 private void start()throws IOException
 {
  TransportMapping transport=new DefaultUdpTransportMapping();
  snmp = new Snmp(transport);
  transport.listen();
 }
 public String getAsString(OID oid)throws IOException
 {
  ResponseEvent event=get(new OID[]{oid});
  return event.getResponse().get(0).getVariable().toString();
 }
 public ResponseEvent get(OID oids[])throws IOException
 {
  PDU pdu=new PDU();
  for(OID oid:oids)
  {
   pdu.add(new VariableBinding(oid));
  }
  pdu.setType(PDU.GET);
  ResponseEvent event=snmp.send(pdu, getTarget(),null);
  if(event != null)
  {
   return event;
  }
  throw new RuntimeException("GET timed out");
 }
 private Target getTarget()
 {
  Address targetAddress=GenericAddress.parse(address);
  CommunityTarget target=new CommunityTarget();
  target.setCommunity(new OctetString("public"));
  target.setAddress(targetAddress);
  target.setRetries(2);
  target.setTimeout(1500);
  target.setVersion(SnmpConstants.version2c);
  return target;
 }
}
 

When I run this program, that shows the exception as given below:

Exception in thread "main" java.lang.NoClassDefFoundError: org/snmp4j/TransportMapping
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.ja va:2442)
at java.lang.Class.getMethod0(Class.java:2685)
at java.lang.Class.getMethod(Class.java:1620)
at sun.launcher.LauncherHelper.getMainMethod(Launcher Helper.java:494)
at sun.launcher.LauncherHelper.checkAndLoadMain(Launc herHelper.java:486)

Caused by: java.lang.ClassNotFoundException: org.snmp4j.TransportMapping
at java.net.URLClassLoader$1.run(URLClassLoader.java: 366)
at java.net.URLClassLoader$1.run(URLClassLoader.java: 355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.j ava:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:4 23)
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:3 56)
... 6 more


Please help me to correct this error. Thanks in advance...

[Kara Hewett]

Did you add the jar SNMP4J to WEB-INF/lib?