I use snmp gettalbe to query some table data from some machine using oid,sometime it print the error log,what does this log mean?I have try to set the parameter like BER.setCheckSequenceLength(true);,but it still happen.
public List<VariableBinding[]> getTable(List oids, SnmpTarget snmpTarget) throws Exception {
Snmp snmp = SnmpComunication.getSession(snmpTarget.getSnmpVersion());
BER.setCheckSequenceLength(true);
Target target = SnmpComunication.getSnmpTarget(snmp, snmpTarget);
TableUtils tableUtils = new TableUtils(snmp, new DefaultPDUFactory(PDU.GET));
OID[] columns = new OID[oids.size()];
for (int i = 0; i < oids.size(); i++) {
columns[i] = new OID(oids.get(i));
}
tableUtils.setMaxNumColumnsPerPDU(5);
List events = tableUtils.getTable(target, columns, null, null);
List<VariableBinding[]> returnList = new ArrayList<>();
if (events.size() == 1 && events.get(0).getColumns() == null) {
return null;
} else {
for (TableEvent event : events) {
if (event.getColumns() == null || event.getColumns().length < 1) {
continue;
}
VariableBinding[] values = event.getColumns();
returnList.add(values);
}
return returnList;
}
}
The error log is:
java.io.IOException: The actual length of the SEQUENCE object org.snmp4j.smi.VariableBinding is 17, but 16 was expected
at org.snmp4j.asn1.BER.checkSequenceLength(BER.java:925)
at org.snmp4j.smi.VariableBinding.decodeBER(VariableBinding.java:193)
at org.snmp4j.PDU.decodeBER(PDU.java:584)
at org.snmp4j.mp.MPv2c.prepareDataElements(MPv2c.java:201)
at org.snmp4j.MessageDispatcherImpl.dispatchMessage(MessageDispatcherImpl.java:278)
at org.snmp4j.MessageDispatcherImpl.processMessage(MessageDispatcherImpl.java:387)
at org.snmp4j.MessageDispatcherImpl.processMessage(MessageDispatcherImpl.java:347)
at org.snmp4j.transport.AbstractTransportMapping.fireProcessMessage(AbstractTransportMapping.java:76)
at org.snmp4j.transport.DefaultUdpTransportMapping$ListenThread.run(DefaultUdpTransportMapping.java:430)
at java.lang.Thread.run(Thread.java:748)