I used 2.5 so clearly the bug is not fixed check the link in my previous mail The PDUFactory is not populating 2 variables and it inevitably leads to a bug
I have sent you my code in the first mail, just give it a try, maybe I missed something But snmp4j examples (v3) are extremely hard to find I really need help here , would you kindly try my code and debug snmp4j entrails ? -----Original Message----- From: Frank Fock [mailto:f...@agentpp.com] Sent: jeudi 11 août 2016 14:49 To: FLORENT Philippe Cc: snmp4j@agentpp.org Subject: Re: [SNMP4J] java.lang.NullPointerException: Context engine ID must not be null What SNMP4J version did you use before? With 2.5.0 you are not forced to provide a SNMPv3 context engine ID. By using 1.1 you probably get some other bugs and have no longer support of choosing the context engine ID. So this is no solution. Best regards Frank > Am 11.08.2016 um 13:13 schrieb FLORENT Philippe > <philippe.flor...@edenred.com>: > > Ok, I downgraded to v 1.1... and now the bug is gone > > -----Original Message----- > From: Frank Fock [mailto:f...@agentpp.com] > Sent: jeudi 11 août 2016 10:26 > To: FLORENT Philippe > Cc: snmp4j@agentpp.org > Subject: Re: [SNMP4J] java.lang.NullPointerException: Context engine ID must > not be null > > Hi, > If walk (which is a GETNEXT in fact) and GET behave differently then most > likely you are using the wrong OID (wrong instance identifier). Sometimes the > agent is broken too. > In your case, you should put the Snmp instance in listen mode to receive > answers from the agent. See FAQ for details. > Best regards > Frank > >> Am 11.08.2016 um 09:29 schrieb FLORENT Philippe >> <philippe.flor...@edenred.com>: >> >> Hello everyone, >> >> >> - Doing a get on some OID give me "unkown instance" although they >> work with snmpwalk on the command line and GET works with mib explorer >> >> >> >> - So I try to implement an snmp walk in snmp4j but I keep getting >> that error >> >> Here is the code >> >> I tried to use request.getContextEngineID(), but it is also null >> >> public class SnmpProber >> { >> private Snmp snmp; >> private UserTarget target; >> >> private byte[] authEngineId0=null; >> >> public SnmpProber(String ipAddress,String port,String userName,String >> authPass,String privPass) >> { >> try >> { >> Address targetAddress = >> GenericAddress.parse("udp:"+ipAddress+"/"+port); >> TransportMapping transport = new DefaultUdpTransportMapping(); >> snmp = new Snmp(transport); >> USM usm = new USM(SecurityProtocols.getInstance(),new >> OctetString(MPv3.createLocalEngineID()), 0); >> SecurityModels.getInstance().addSecurityModel(usm); >> transport.listen(); >> >> target = new UserTarget(); >> target.setAddress(targetAddress); >> target.setRetries(1); >> target.setTimeout(5000); >> target.setVersion(SnmpConstants.version3); >> target.setSecurityLevel(SecurityLevel.AUTH_PRIV); >> target.setSecurityName(new OctetString(userName)); >> >> authEngineId0 = >> snmp.discoverAuthoritativeEngineID(target.getAddress(), 5000); >> >> if(authEngineId0==null) >> System.out.println("cannot connect"); >> else >> { >> // add user to the USM >> UsmUser usmUser=new UsmUser(new OctetString(userName), >> AuthSHA.ID, >> new OctetString(authPass), >> PrivAES128.ID, >> new OctetString(privPass)); >> >> snmp.getUSM().addUser(new OctetString("v3DefaultUser"), >> new OctetString(authEngineId0), >> usmUser); >> } >> } catch (IOException ex) { >> Logger.getLogger(SnmpProber.class.getName()).log(Level.SEVERE, >> null, ex); >> } >> } >> >> public boolean isOk() >> { >> return authEngineId0!=null; >> } >> >> class WalkCounts { >> public int requests; >> public int objects; >> } >> >> public List<VariableBinding> walk(String oid) >> { >> final List<VariableBinding> result; >> result = new LinkedList<VariableBinding>(); >> ScopedPDU request; >> request = new ScopedPDU(); >> request.setType(PDU.GETNEXT); >> >> request.add(new VariableBinding(new OID(oid))); >> >> request.setNonRepeaters(0); >> >> OID rootOID = request.get(0).getOid(); >> >> final WalkCounts counts = new WalkCounts(); >> final long startTime = System.currentTimeMillis(); >> TreeUtils treeUtils = new TreeUtils(snmp, new DefaultPDUFactory()); >> >> TreeListener treeListener = new TreeListener() >> { >> public boolean next(TreeEvent e) { >> counts.requests++; >> >> if (e.getVariableBindings() != null) { >> VariableBinding[] vbs = e.getVariableBindings(); >> counts.objects += vbs.length; >> for (int i = 0; i < vbs.length; i++) { >> if (result != null) { >> result.add(vbs[i]); >> } >> System.out.println(vbs[i].toString()); >> } >> } >> return true; >> } >> >> @Override >> public void finished(TreeEvent e) { >> if ((e.getVariableBindings() != null) >> && (e.getVariableBindings().length > 0)) { >> next(e); >> } >> >> System.out.println("Total requests sent: "+ >> counts.requests); >> System.out.println("Total objects received: "+ counts.objects); >> System.out.println("Total walk time: "+ >> (System.currentTimeMillis() - startTime)+ " milliseconds"); >> >> if (e.isError()) { >> System.err.println("The following error occurred during >> walk:"); >> System.err.println(e.getErrorMessage()); >> } >> synchronized (this) { >> this.notify(); >> } >> } >> >> @Override >> public boolean isFinished() { >> return true; >> } >> }; >> >> synchronized (treeListener) >> { >> treeUtils.getSubtree(target, rootOID, null, treeListener); >> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< exception here >> try >> { >> treeListener.wait(); >> } >> catch (InterruptedException ex) >> { >> System.out.println("Tree retrieval interrupted: "+ex); >> Thread.currentThread().interrupt(); >> } >> } >> >> return result; >> } >> >> public void Release() >> { >> try { >> snmp.close(); >> } catch (IOException ex) { >> Logger.getLogger(SnmpProber.class.getName()).log(Level.SEVERE, >> null, ex); >> } >> } >> } >> >> >> >> >> _______________________________________________ >> SNMP4J mailing list >> SNMP4J@agentpp.org >> https://oosnmp.net/mailman/listinfo/snmp4j > _______________________________________________ SNMP4J mailing list SNMP4J@agentpp.org https://oosnmp.net/mailman/listinfo/snmp4j
