Hi, We are working on college project. We are unable to solve the
problem that we have come up while coding. Please, help us.Here is our code.
//import java.net.InetAddress;import
org.snmp4j.CommunityTarget;import org.snmp4j.PDU;import
org.snmp4j.Snmp;import org.snmp4j.TransportMapping;import
org.snmp4j.event.ResponseEvent;import org.snmp4j.event.ResponseListener;import
org.snmp4j.mp.SnmpConstants;import org.snmp4j.smi.*;import
org.snmp4j.transport.DefaultUdpTransportMapping;//import
java.lang.NullPointerException;public class SNMP4JHelper{ public static final
int SNMP_PORT = 161; public static final String READ_COMMUNITY =
"public"; public static final String WRITE_COMMUNITY= "private"; public
static final int mSNMPVersion =0; // 0 represents
SNMP version=1 public static final String OID_Hard_disk =
"1.3.6.1.2.1.1.3.0";// "1.3.6.1.4.1.2021.9.1.7.1";//
".1.3.6.1.4.1.2021.4.4.0";//
"1.3.6.1.4.1.311.1.1.3.1.1.5.1.3";
//"1.3.6.1.4.1.318.1.1.1.12.3.2.1.3.1"; //public static final String
OID_UPS_BATTERY_CAPACITY="1.3.6.1.4.1.318.1.1.1.2.2.1.0"; public static void
main(String[] args) { try {//
"172.20.1.150" String strIPAddress = "127.0.0.1";
SNMP4JHelper objSNMP = new SNMP4JHelper();
//objSNMP.snmpSet(); int Value = 1;
/////////////////////////////////////////// //Set Value=2
to trun OFF UPS OUTLET
Group1 //Value=1 to trun ON UPS OUTLET Group1
//////////////////////////////////////////
// "strIPAddress, WRITE_COMMUNITY,OID_Hard_disk, Value" //
UPS_OUTLET_GROUP1 objSNMP.snmpSet(strIPAddress,
WRITE_COMMUNITY,OID_Hard_disk,
Value);
//////////////////////////////////////////////////////////
//Get Basic state of UPS
/////////////////////////////////////////////////////////
String batteryCap
=objSNMP.snmpGet(strIPAddress,READ_COMMUNITY,OID_Hard_disk);
} catch (Exception e) {
e.printStackTrace(); }
} /* * The following code valid only SNMP version1. This
* method is very useful to set a parameter on remote device. * */
public void snmpSet(String strAddress, String community, String strOID, int
Value) { strAddress= strAddress+"/"+SNMP_PORT;
Address
targetAddress = GenericAddress.parse(strAddress); Snmp snmp;
try { TransportMapping transport
= new DefaultUdpTransportMapping(); snmp = new
Snmp(transport); transport.listen();
CommunityTarget target = new CommunityTarget();
target.setCommunity(new OctetString(community));
target.setAddress(targetAddress); target.setRetries(2);
target.setTimeout(5000);
target.setVersion(SnmpConstants.version1); PDU pdu = new
PDU();// pdu.add(new VariableBinding(new OID(strOID), new
Integer32(Value))); pdu.setType(PDU.SET);
ResponseListener listener = new ResponseListener() {
public void onResponse(ResponseEvent event)
{ // Always cancel async request
when response has been received // otherwise a
memory leak is created! Not canceling a request
// immediately can be
useful when sending a request to a broadcast
// address
((Snmp)event.getSource()).cancel(event.getRequest(), this);
if ( event.getResponse() != null )
{ System.out.println("Set
Status is:"+event.getResponse().getErrorStatusText());
} } };
snmp.send(pdu, target, null, listener);
snmp.close();
} catch (Exception e) {
e.printStackTrace(); } } /* * The
code is valid only SNMP version1.
SnmpGet method * return Response for given OID from the Device. */
public
String snmpGet(String strAddress, String community, String strOID) {
String str=""; try {
OctetString comm1 = new OctetString(community);
strAddress= strAddress+"/"+ SNMP_PORT; Address targetaddress =
new UdpAddress(strAddress);
TransportMapping transport = new DefaultUdpTransportMapping();
transport.listen(); CommunityTarget comtarget = new
CommunityTarget(); comtarget.setCommunity(comm1);
comtarget.setVersion(SnmpConstants.version1);
comtarget.setAddress(targetaddress);
comtarget.setRetries(2); comtarget.setTimeout(5000);
PDU pdu = new PDU(); ResponseEvent response;
Snmp snmp; pdu.add(new VariableBinding(new
OID(strOID))); pdu.setType(PDU.GET); snmp =
new Snmp(transport); response =
snmp.get(pdu,comtarget); if(response != null)
{ System.out.println( "Error msg : " +
response.getError().toString() );
if(response.getResponse().getErrorStatusText().equalsIgnoreCase("Success"))
{ PDU
pduresponse=response.getResponse();
str=pduresponse.getVariableBindings().firstElement().toString();
if(str.contains("="))
{ int len =
str.indexOf("=");
str=str.substring(len+1, str.length()); }
}
} else {
System.out.println("Feeling like a TimeOut occured ");
} snmp.close(); } catch(Exception e)
{ e.printStackTrace(); } System.out.println("Response="+str);
return str; }}
On running the code::::::
java.lang.NullPointerExceptionResponse= at
SNMP4JHelper.snmpGet(SNMP4JHelper.java:131) at
SNMP4JHelper.main(SNMP4JHelper.java:45)
Please guide
us.Thank you.
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