Thursday, July 14, 2016

Error on SNMP Java Client Application

Error on SNMP Java Client Application


sreekandank
P: 45

sreekandank
I have written the following SNMP client code to display the hardware information
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  1. import java.io.IOException;
  2. import org.snmp4j.CommunityTarget;
  3. import org.snmp4j.PDU;
  4. import org.snmp4j.Snmp;
  5. import org.snmp4j.Target;
  6. import org.snmp4j.TransportMapping;
  7. import org.snmp4j.event.ResponseEvent;
  8. import org.snmp4j.mp.SnmpConstants;
  9. import org.snmp4j.smi.Address;
  10. import org.snmp4j.smi.GenericAddress;
  11. import org.snmp4j.smi.OID;
  12. import org.snmp4j.smi.OctetString;
  13. import org.snmp4j.smi.VariableBinding;
  14. import org.snmp4j.transport.DefaultUdpTransportMapping;
  15. public class SNMPManager
  16. {
  17.  Snmp snmp=null;
  18.  String address=null;
  19.  public SNMPManager(String add)
  20.  {
  21.   address=add;
  22.  }
  23.  public static void main(String[] args)throws IOException
  24.  {
  25.   SNMPManager client=new SNMPManager("udp:127.0.0.1/161");
  26.   client.start();
  27.   String sysDescr=client.getAsString(new OID(".1.3.6.1.2.1.1.1.0"));
  28.   System.out.println(sysDescr);
  29.  }
  30.  private void start()throws IOException
  31.  {
  32.   TransportMapping transport=new DefaultUdpTransportMapping();
  33.   snmp = new Snmp(transport);
  34.   transport.listen();
  35.  }
  36.  public String getAsString(OID oid)throws IOException
  37.  {
  38.   ResponseEvent event=get(new OID[]{oid});
  39.   return event.getResponse().get(0).getVariable().toString();
  40.  }
  41.  public ResponseEvent get(OID oids[])throws IOException
  42.  {
  43.   PDU pdu=new PDU();
  44.   for(OID oid:oids)
  45.   {
  46.    pdu.add(new VariableBinding(oid));
  47.   }
  48.   pdu.setType(PDU.GET);
  49.   ResponseEvent event=snmp.send(pdu, getTarget(),null);
  50.   if(event != null)
  51.   {
  52.    return event;
  53.   }
  54.   throw new RuntimeException("GET timed out");
  55.  }
  56.  private Target getTarget()
  57.  {
  58.   Address targetAddress=GenericAddress.parse(address);
  59.   CommunityTarget target=new CommunityTarget();
  60.   target.setCommunity(new OctetString("public"));
  61.   target.setAddress(targetAddress);
  62.   target.setRetries(2);
  63.   target.setTimeout(1500);
  64.   target.setVersion(SnmpConstants.version2c);
  65.   return target;
  66.  }
  67. }
  68.  
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?
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