Programing in java using snmp

hi
i am new to snmp so plz bear with me actually i am trying to build a network monitoring system using snmp.how do i go abt it.how do i start?my application will be running on the server and i have made a database in sql which i hav connected using jdbc and now i want to retrieve data from the managed computers i want the object ids of the managed computers and i want to use snmp commands like get() but i am unable to do so as i dont know the required packages which i need to import i would appreciate if someone can provide with some code snippets or any other related information
thanks

STOP CROSS POSTING THIS QUESTION
http://forum.java.sun.com/thread.jspa?threadID=703014

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Hi,
I already ask in the forum Advanced Language Topics
http://forum.java.sun.com/thread.jsp?forum=4&thread=320674
but I din't receive any answer so I try here maybe some one could help me on this ... ;-)
I find a nice piece of code on Internet to do SNMP request �
http://membres.lycos.fr/ysoun/index.html
http://membres.lycos.fr/ysoun/sck.zip
It works find to do some GET operations like doing a GET sysDescr (oid 1.3.6.1.2.1.1.1.0).
But I would like to do a SET operation but I could'nt succeed.
First I do a get on an oid 1.3.6.1.2.1.1.4.0 (sysContact) and I get the value "hello" which is find and I would like to set this value to "good bye".
Well I have to say that I don�t know very well the SNMP protocol and I couldn�t figure out where to put the value in order to set "Good bye". Off course I have the right community to do that but I just can't figure out how can I do that ...
Any comment ... help ... ideas ... are more than welcome !!!! Or maybe some better SNMP package to do that???
thanks,
Emmanuel
Here is the code:
the function to set using SNMP ...
public static setSnmpRequest(int snmpPort, int snmpTimeout, String community, String host, String strValue){
 String oid = new String("1.3.6.1.2.1.1.4.0");
 D_SNMP.Message request;
 try {
 InetAddress snmpHost = InetAddress.getByName(host);
 DatagramSocket sock = new DatagramSocket();
 sock.setSoTimeout(snmpTimeout);
 // create pdu.
 //somewhere here I should include my variable "good bye" but I don't really know how
 Var var = new Var(oid);
 OctetString c = new OctetString(community);
 D_SNMP.Integer requestId = new D_SNMP.Integer(0);
 D_SNMP.Integer errorIndex = new D_SNMP.Integer(0);
 D_SNMP.Integer errorStatus = new D_SNMP.Integer(0);
 //For the GET:
 //PduCmd pdu = new PduCmd(Pdu.GET,requestId,errorStatus,errorIndex,new VarList(var));
 //What I would like to do:
 PduCmd pdu = new PduCmd(Pdu.SET,requestId,errorStatus,errorIndex,new VarList(var));
 D_SNMP.Message m = new D_SNMP.Message(c,pdu);
 // send
 byte[] b = m.codeBer();
 DatagramPacket packet = new DatagramPacket(b,b.length,snmpHost,snmpPort);
 byte[] b2 = new byte[1024];
 DatagramPacket p2 = new DatagramPacket(b2,b2.length);
 long startTime = System.currentTimeMillis();
 sock.send(packet);
 sock.receive(p2); // block or ... timeout.
 long time = (System.currentTimeMillis() - startTime);
 // display
 ByteArrayInputStream ber = new ByteArrayInputStream(b2,1,p2.getLength()-1); // without tag !
 D_SNMP.Message m2 = new D_SNMP.Message(ber);
 System.out.println("snmpPing " + host + " :");
 System.out.println(m2.getPdu().getVarList().elementAt(0) + " / time = " + time + "ms" );
 if (debug){
 StringBuffer buf = new StringBuffer();
 m2.println("",buf);
 System.out.println(buf);
 } catch (UnknownHostException ex){
 System.out.println(host + ": unknown host." );
 } catch (InterruptedIOException ex){
 System.out.println("snmpPing "+ host + " : Time-out." );
 } catch ( Exception ex) {
 System.out.println("Error in : ");
 System.out.println(ex);
} the class Var... where somewhere I should be able to set the variable "Good bye" ...
import java.io.*;
import java.util.Vector;
/** ASN.1 grammar for Var:
* Var ::=
* SEQUENCE
* { name Oid
* value CHOICE {Null, Integer, Counter, gauge, Timeticks, IpAddress, OctetString}
final public class Var extends construct implements Serializable {
public Var(Oid o, smi s){
 this();
 valeur.addElement(o);
 valeur.addElement(s);
/** Same as Var(new Oid(oid), new Null()).
public Var(String oid) throws IOException{
 this(new Oid(oid), new D_SNMP.Null());
/** Builds a Var from a ByteArrayInputStream holding a Var Ber coding.
 * Bytes read are removed from the stream.
 * Note: The ByteArrayInputStream must not contain the Var Tag.
 * @exception IOException is thrown if a problem occurs while trying to decode the stream.
public Var(ByteArrayInputStream inBer) throws IOException{
 this();
 decodeBer(inBer);
/** Used only by VarList.
Var(){
 super(smi.SEQUENCE_tag);
 valeur = new Vector(2);
/** Returns the name of this Var.
public Oid getName(){
 return (Oid) valeur.elementAt(0);
/** Returns the value of this Var.
public smi getValue(){
 return (smi) valeur.elementAt(1);
/** Returns the value of this Var as a String.
public String toString() {
 try{
 return ((smi)valeur.elementAt(0)).toString() + " = " + ((smi)valeur.elementAt(1)).toString();
 }catch (IndexOutOfBoundsException e) { // ne doit pas se produire.
 System.out.println("Erreur codage interne type Var.");
 System.exit(1);
 return null;
/** Used smi.decodeBer().
void decodeValeur(ByteArrayInputStream bufferBer, int lgBerValeur) throws IOException {
 int tag = bufferBer.read();
 if ( tag != smi.OID_tag )
 throw new IOException ("erreur decodage tag Oid de Var: byte " + java.lang.Integer.toHexString(tag) +" recu.");
 Oid name = new Oid(bufferBer);
 this.valeur.addElement(name);
 // lis l'objet suivant.
 tag = bufferBer.read();
 try{
 smi _valeur = smiFactory.create(tag,bufferBer);
 this.valeur.addElement(_valeur);
 } catch (IOException e){
 throw new IOException ("erreur decodage champ Valeur : " + e);
/** Custom serialization: Ber coding is written in ObjectOutputStream.
private void writeObject(ObjectOutputStream out) throws IOException{
 byte b[] = this.codeBer();
 out.writeInt(b.length);
 out.write(b);
 out.flush();
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
 this._tag = smi.SEQUENCE_tag;
 this.valeur = new Vector();
 int len = in.readInt();
 byte b[] = new byte[len];
 in.readFully(b);
 this.decodeBer(new ByteArrayInputStream(b,1,b.length-1));
} the class VarList ...
import java.io.*;
import java.util.Vector;
/** ASN.1 grammar for VarList:
* VarList ::=
* SEQUENCE OF Var
final public class VarList extends construct {
/** Constructs a VarList holding a single Var.
 * @param Var to be held by Varlist
 public VarList(Var v){
 super(smi.SEQUENCE_tag);
 valeur = new Vector(1);
 valeur.addElement(v);
/** Constructs a VarList holding Vars.
 * @param v Vector of Vars.
 public VarList(Vector v){
 super(smi.SEQUENCE_tag);
 valeur = (Vector) v.clone();
 /** Constructs a VarList holding Vars.
 * @param tab array of Vars.
 public VarList(Var[] tab){
 super(smi.SEQUENCE_tag);
 int taille = tab.length;
 valeur = new Vector(taille);
 for (int i=0; i<taille; i++)
 valeur.addElement(tab);
/** Builds a VarList from a ByteArrayInputStream holding a VarList Ber coding.
* Bytes read are removed from the stream.
* Note: The ByteArrayInputStream must not contain the Var Tag.
* @exception IOException is thrown if a problem occurs while trying to decode the stream.
public VarList(ByteArrayInputStream inBer) throws IOException{
super(smi.SEQUENCE_tag);
valeur = new Vector();
decodeBer(inBer);
/** Returns the Var at the specified index.
public Var elementAt(int i) throws IndexOutOfBoundsException {
return (Var)valeur.elementAt(i); // Sans soucis: Var est immutable
/** Returns the number of Var held this VarList.
public int getSize(){
return valeur.size();
/** Used by smi.decodeBer().
* A VarList is in fact an array of Vars.
void decodeValeur(ByteArrayInputStream bufferBer, int lgBerValeur) throws IOException {
Var v;
int lg;
try{
while (lgBerValeur >0){
int tag = bufferBer.read();
lgBerValeur --;
if ( tag != smi.SEQUENCE_tag )
throw new IOException ("error decoding tag Var in VarList: byte " +
java.lang.Integer.toHexString(tag) +" read.");
v =new Var();
lg = v.decodeBer(bufferBer);
this.valeur.addElement(v);
lgBerValeur -= lg;
} catch (IOException e){
throw new IOException ("error decoding Value : " + e);

I read the documentation it does not help me much, (it's generated by javadoc and there is not enought comment to understand the whole thing ... in fact it just miss a sample of SET request and it would be perfect ...
thanks,
emmanuel
PS: I'm going to try the author again
PS: Still ... any help or pakage to do SET request using SNMP are more than welcome ...

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hi
please understand that I am not trying to ask anymore to do this hw for me. I am new to java and working on the assignment. below is the specification of this program:
Calculate PI using Random Numbers
In geometry the ratio of the circumference of a circle to its diameter is known as �. The value of � can be estimated from an infinite series of the form:
� / 4 = 1 - (1/3) + (1/5) - (1/7) + (1/9) - (1/11) + ...
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Random randomGen = new Random ( System.currentTimeMillis() );
Imagine that the square dart board has a coordinate system attached to it. The upper right corner has coordinates ( 1.0, 1.0) and the lower left corner has coordinates ( -1.0, -1.0 ). It has sides that are 2 units long and its center (as well as the center of the inscribed circle) is at the origin.
A random point inside the dart board can be specified by its x and y coordinates. These values are generated using the random number generator. There is a method nextDouble() that will return a double between 0.0 (inclusive) and 1.0 (exclusive). But we need random numbers between -1.0 and +1.0. The way we achieve that is:
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double yPos = (randomGen.nextDouble()) * 2 - 1.0;
To determine if a point is inside the circle its distance from the center of the circle must be less than the radius of the circle. The distance of a point with coordinates ( xPos, yPos ) from the center is Math.sqrt ( xPos * xPos + yPos * yPos ). The radius of the circle is 1 unit.
The class that you will be writing will be called CalculatePI. It will have the following structure:
import java.util.*;
public class CalculatePI
public static boolean isInside ( double xPos, double yPos )
public static double computePI ( int numThrows )
public static void main ( String[] args )
In your method main() you want to experiment and see if the accuracy of PI increases with the number of throws on the dartboard. You will compare your result with the value given by Math.PI. The quantity Difference in the output is your calculated value of PI minus Math.PI. Use the following number of throws to run your experiment - 100, 1000, 10,000, and 100,000. You will call the method computePI() with these numbers as input parameters. Your output will be of the following form:
Computation of PI using Random Numbers
Number of throws = 100, Computed PI = ..., Difference = ...
Number of throws = 1000, Computed PI = ..., Difference = ...
Number of throws = 10000, Computed PI = ..., Difference = ...
Number of throws = 100000, Computed PI = ..., Difference = ...
* Difference = Computed PI - Math.PI
In the method computePI() you will simulate the throw of a dart by generating random numbers for the x and y coordinates. You will call the method isInside() to determine if the point is inside the circle or not. This you will do as many times as specified by the number of throws. You will keep a count of the number of times a dart landed inside the circle. That figure divided by the total number of throws is the ratio � / 4. The method computePI() will return the computed value of PI.
and below is what i have so far:
import java.util.*;
public class CalculatePI
public static boolean isInside ( double xPos, double yPos )
 double distance = Math.sqrt( xPos * xPos + yPos * yPos );
public static double computePI ( int numThrows )
 Random randomGen = new Random ( System.currentTimeMillis() );
 double xPos = (randomGen.nextDouble()) * 2 - 1.0;
 double yPos = (randomGen.nextDouble()) * 2 - 1.0;
 int hits = 0;
 int darts = 0;
 int i = 0;
 int areaSquare = 4 ;
 while (i <= numThrows)
 if (distance< 1)
 hits = hits + 1;
 if (distance <= areaSquare)
 darts = darts + 1;
 double PI = 4 * ( hits / darts );
 i = i+1;
public static void main ( String[] args )
 Scanner sc = new Scanner (System.in);
 System.out.print ("Enter number of throws:");
 int numThrows = sc.nextInt();
 double Difference = PI - Math.PI;
 System.out.println ("Number of throws = " + numThrows + ", Computed PI = " + PI + ", Difference = " + difference );
}when I tried to compile it says "cannot find variable 'distance' " in the while loop. but i thought i already declare that variable in the above method. Please give me some ideas to solve this problem and please check my program to see if there is any other mistakes.
Thanks a lot.

You've declared a local variable, distance, in the method isInside(). The scope of this variable is limited to the method in which it is declared. There is no declaration for distance in computePI() and that is why the compiler gives you an error.
I won't check your entire program but I did notice that isInside() is declared to be a boolean method but doesn't return anything, let alone a boolean value. In fact, it doesn't even compute a boolean value.

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hi,
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'''Anonymous'''
Please post a separate question. Thank you. https://support.mozilla.com/tiki-ask_a_question.php?locale=en-US&forumId=1
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SAVE the installer to your hard drive (Desktop is a good place so you can find it). When the download is complete, exit Firefox (File > Exit), locate and double-click in the installer you just downloaded, let the install complete.
See: '''[http://support.mozilla.com/en-US/kb/Using+the+Shockwave+plugin+with+Firefox#_Installing_Shockwave Installing Shockwave]'''
'''You '''~~red:'''MAY'''~~''' need to Update Adobe Reader for Firefox (aka Adobe PDF Plug-In For Firefox)''': your ver. N/A; current ver. 9.3.3 (important security update release 06-29-2010; see: http://www.adobe.com/support/security/bulletins/apsb10-15.html)
~~red:Check your version here~~: http://www.mozilla.com/en-US/plugincheck/
See: http://support.mozilla.com/en-US/kb/Using+the+Adobe+Reader+plugin+with+Firefox#Installing_and_updating_Adobe_Reader
''You may be able to update from the Adobe Reader installed on your system'' instead of going to the Adobe site and downloading. Open the Adobe Reader installed on your system (''in Windows, Start > Program Files, find and click Adobe Reader to open''), click Help, click Check for Updates.
''If you go to the Adobe site to download the current Adobe Reader:''
-'''use Firefox to download''' and '''SAVE to your hard drive''' (save to Desktop for easy access)
~~red:-See the images at the bottom left of this post to see the steps to take on the Adobe site~~
-exit Firefox (File > Exit)
-In Windows: check to see that Firefox is completely closed (''Ctrl+Alt+Del, choose Task Manager, click Processes tab, if "firefox.exe" is on the list, right-click "firefox.exe" and choose End process, close the Task Manager window'')
-In Windows: double-click on the Adobe Reader installer you just downloaded to install/update Adobe Reader
*'''NOTE: On Vista and Windows 7''' you may need to run the plugin installer as Administrator by starting the installer via the right-click context menu if you do not get an UAC prompt to ask for permission to continue (i.e nothing seems to happen). See this: http://vistasupport.mvps.org/run_as_administrator.htm
*'''NOTE for IE:''' Firefox and most other browsers use a Plugin. IE uses an ActiveX version. To install/update the IE ActiveX version, same instructions as above, except use IE to download the ActiveX installer. See: [[ActiveX]]
*Also see: http://kb.mozillazine.org/Adobe_Reader ~~red:'''''AND'''''~~ [[How do I edit options to add Adobe to the list of allowed sites]]

When i click on the Firefox icon I get an error message, C:\Program Files\Java\jre6\lib\deploy\jqs\ff\..\..\..\..\bin\jqsnotify\.exe cannot be found. What is it? and how do i fix it? in English

When i click on the icon to open Firefox an error message box appears with the following message, C:\Program Files\Java\jre6\lib\deploy\jqs\ff\..\..\..\..\bin\jqsnotify\.exe cannot be found. It then advises me to use the Search function, but the search function says it is unavailable.
What is it? and how do I fix it? in English

See:
http://www.java.com/en/download/help/quickstarter.xml - What is Java Quick Starter (JQS)? What is the benefit of running JQS? - 6.0

How to create a program in J2EE using eclipse

Hello
I am planning to start with J2EE. i have downloaded glassfish v3, maven, derby and JUnit and eclipse. But i am not getting how to start with it.
please guide me.i am following apress publication's Antonio Goncalves. How to write a program , how to deploy with glassfish then.
really confused..
thanking in advance

abhinav291988 wrote:
Hello
I am planning to start with J2EE. i have downloaded glassfish v3, maven, derby and JUnit and eclipse. But i am not getting how to start with it.
please guide me.i am following apress publication's Antonio Goncalves. How to write a program , how to deploy with glassfish then.
really confused..
thanking in advanceIn terms of learning how to use Eclipse [http://eclipsetutorial.sourceforge.net/]
In terms of learning how to use Java EE [http://java.sun.com/javaee/5/docs/tutorial/doc/]
In terms of how to write a program [http://java.sun.com/docs/books/tutorial/]
If you have a specific question to ask, then please repost. My suggestion would be to take the Eclipse tutorial to familiarize yourself, and then follow along in your book. If the book is too advanced, buy one aimed more at beginners. Online tutorials should also help you out.
- Saish

Asynchronous socket programming in Java?

I am a C++ programmer, I just wonder how do I do asynchronous programming in Java?
In VC++, you can hook an event handler to the socket and the system will fire an event whenever there is data coming in to the socket. The event handler can then spawn a thread and handle the network message.
In Unix, you can use the select() function. This function will return whenever the indicated socket fires events. If nothing happens within the timeout period, the function simply returns.
What about in Java? I don't see any methods that allows you to hook an event handler to it. Is there anything like select() function in Unix?
Thanks so much.

There is something very much like C's select: selectors. I don't immediately know where to read more about them but google for things like "java selector example", "java nio tutorial", etc (NIO = new I/O, the library where selectors live.)
Another way to do async sockets in Java is by threading. That is the traditional way before New I/O. It's still a perfectly good and easy way, thanks to Java's easy threading. Downside is that it scales to only maybe 100-200 simultaneous connections per server (will depend on your operating system). For thread-based sockets check Sun's Java socket tutorial (first item when you google "java socket tutorial").

Java6: How to compile java using JavaCompiler class

Hi all,
Using JavaCompiler, we can run the java program thru programmaticaly using run() method.
Could anyone please tell me how to compile a java program using JavaCompailer class? Or calling run() itself will compile java file?
Thanks
Shagil

import spoon.support.input.SpoonInputStream;
import com.sun.tools.javac.code.Symbol.ClassSymbol;
import com.sun.tools.javac.comp.Attr;
import com.sun.tools.javac.comp.AttrContext;
import com.sun.tools.javac.comp.Enter;
import com.sun.tools.javac.comp.Env;
import com.sun.tools.javac.comp.Todo;
import com.sun.tools.javac.tree.Tree;
import com.sun.tools.javac.tree.Tree.ClassDef;
import com.sun.tools.javac.tree.Tree.TopLevel;
import com.sun.tools.javac.util.Abort;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.List;
import com.sun.tools.javac.util.ListBuffer;
import com.sun.tools.javac.util.Log;
import com.sun.tools.javac.util.Name;
* The Spoon compiler (uses javac).
public class SpoonCompiler extends com.sun.tools.javac.main.JavaCompiler {
 Attr attr;
 Enter enter;
 boolean hasBeenUsed = false;
 Log log;
 Todo todo;
 public SpoonCompiler(Context arg0) {
 super(arg0);
 enter = Enter.instance(arg0);
 todo = Todo.instance(arg0);
 log = Log.instance(arg0);
 attr = Attr.instance(arg0);
 sourceOutput=true;
 * Main method: compile a list of files, return all compiled classes
 * @param filenames
 * The names of all files to be compiled.
 @SuppressWarnings("unused")
 public List<Tree> parseAndAttribute(List<SpoonInputStream> filenames)
 throws Throwable {
 // as a JavaCompiler can only be used once, throw an exception if
 // it has been used before.
 assert !hasBeenUsed : "attempt to reuse JavaCompiler";
 hasBeenUsed = true;
 long msec = System.currentTimeMillis();
 ListBuffer<ClassSymbol> classes = new ListBuffer<ClassSymbol>();
 try {
 // parse all files
 ListBuffer<Tree> trees = new ListBuffer<Tree>();
 for (List<SpoonInputStream> l = filenames; l.nonEmpty(); l = l.tail) {
 trees.append(parse(l.head.getFileName(),l.head.getStream()));
 // enter symbols for all files
 List<Tree> roots = trees.toList();
 if (errorCount() == 0)
 enter.main(roots);
 // If generating source, remember the classes declared in
 // the original compilation units listed on the command line.
 List<ClassDef> rootClasses = null;
 if (sourceOutput || stubOutput) {
 ListBuffer<ClassDef> cdefs = new ListBuffer<ClassDef>();
 for (List<Tree> l = roots; l.nonEmpty(); l = l.tail) {
 for (List<Tree> defs = ((TopLevel) l.head).defs; defs
 .nonEmpty(); defs = defs.tail) {
 if (defs.head instanceof ClassDef)
 cdefs.append((ClassDef) defs.head);
 rootClasses = cdefs.toList();
 while (todo.nonEmpty()) {
 Env<AttrContext> env = todo.next();
 // save tree prior to rewriting
 Tree untranslated = env.tree;
 // attribution phase
 if (verbose)
 printVerbose("checking.attribution", env.enclClass.sym);
 Name prev = log.useSource(env.enclClass.sym.sourcefile);
 attr.attribClass(env.tree.pos, env.enclClass.sym);
 return trees.toList();
 } catch (Abort ex) {
 ex.printStackTrace();
 if (verbose)
 printVerbose("total", Long.toString(System.currentTimeMillis()
 - msec));
 int errCount = errorCount();
 if (errCount == 1)
 printerCount("error", errCount);
 else
 printerCount("error.plural", errCount);
 if (log.nwarnings == 1)
 printerCount("warn", log.nwarnings);
 else
 printerCount("warn.plural", log.nwarnings);
 return null;
 private void printerCount(String str, int val) {
 System.err.println(str + " - " + val);
 private void printVerbose(String arg0, Object obj) {
 System.out.println(arg0 + " - " + obj.toString());
--- NEW FILE: CtBuilder.java ---
package spoon.support.builder;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Stack;
import java.util.TreeSet;
import spoon.query.Query;
import spoon.query.TypeFilter;
import spoon.reflect.CtFactory;
import spoon.reflect.code.BinaryOperatorKind;
import spoon.reflect.code.CtAbstractInvocation;
import spoon.reflect.code.CtArrayAccess;
import spoon.reflect.code.CtAssert;
import spoon.reflect.code.CtAssignment;
import spoon.reflect.code.CtBinaryOperator;
[...1760 lines suppressed...]
 var.setSimpleName(tree.sym.name.toString());
 var.setModifiers(getModifiers(tree.mods.flags));
 enter(var, tree);
 scan(tree.init);
 exit(var, tree);
 @Override
 public void visitWhileLoop(WhileLoop tree) {
 CtWhile whileLoop = new CtWhileImpl();
 enter(whileLoop, tree);
 builderContext.loopParameter = 1;
 scan(tree.cond);
 builderContext.loopParameter = 0;
 scan(tree.body);
 exit(whileLoop, tree);
}

Can i create an exetutable (.exe) program with java???????

I would like to learn how i can create an exetutable (.exe) program with java.
Is there any additional package which i should download or buy it?
Also i would like to write files into CD's direct from my application.
Is there any library which i must download or buy?
Thanks!

check out the free open source GNU gcj native compiler for Java to see if it will do what you want.
http://gcc.gnu.org/java/
for writing data files you could use java.io.BufferedWriter. For sound files, look in the javax.sound package

Programing in java using snmp

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