My 6, 7, y, u, h, j, n, m key's are not working on my hp pavilion g6 PLEASE HELP!!!
my 6, 7, y, u, h, j, n, m key's are not working. they used to work but even then i had to hold down one of those unresponsive keys to get the others to work now i can't use them at all!! i have to use the on screen keyboard which is really annoying but is the only way i can use my laptop
i have a hp pavilion g6 4GB i3 core 64 bit windows . i think the warrenty has expired as it is a refurbished laptop
Hello momomhammed:
I think you forgot to type in HP g6 1239as because I could not find HP g6 123sa. This is the only steps they give for your lat top. http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01458194&tmp_task=solveCategory&cc=uk&dlc=en&lc... I would do the reset direction first then do the update drives for it. To see if that fixes the issue. If it doesn't then yout computer needs repairing. frrw.
Similar Messages
-
Understanding problem with threads
Hi,
yesterday (at least i think it was yesterday) I posted a question in this forum, I needed help with writing a multithreaded server. The answer was simple and I wrote my program. It kinda works, but there is one thing I don't understand:
I have a class, which handles the clientconnections and one that listens for incoming conections. I pass the socket returned by ServerSocket.accept() to the clientconnection object.
There is only ONE clientconnection-object. The listener just passes the socket and calls the start() method of the clientconnection object.
The clientconnection just writes some text to the client. Connecting more than one client at the same time works too. Everything works fine. And that's what I don't get. If I have only O N E clientconnection the texttransfer shouldn't work after i connect the second client, right?
But it does, is there a mistake in my logic or am I losing my sanity? :)Hi again Danbas,
Maybe you are losing your sanity... but that's ok. :)
public void startlistening(){
while(true){
try{
clientconn cc = new clientconn(ssock.accept());
}catch(IOException ie){}
//The Constructor in clientconn would look like this:
public clientconn(Socket sock){
//No idea what to do here
Every time you perform "new", you create a new object. And you are calling new every time you accept a new socket connection. So you are creating a new clientconn object each time. -
Slight problem with threads....
Hello,
Just started learning threads a few days ago.. my objective is to move an oval from left to right, then right to left, back and forth and so on.. however, it wont work, the source code i have below seems logical, but it doesnt fulfill my objective..
// The "MovingCircleUsingThreads" class.
import java.applet.*;
import java.awt.*;
public class MovingCircleUsingThreads extends Applet implements Runnable
int x = 0;
Thread t;
public void init ()
t = new Thread (this);
t.start ();
} // init method
public void run ()
try
while (true)
repaint ();
Thread.sleep (20);
catch (Exception e)
public void paint (Graphics g)
int speed = 10;
Dimension d = getSize ();
g.fillOval (x, d.height / 4, 50, 50);
x = x + speed;
if (x + 50 == d.width)
speed = -10;
} // MovingCircleUsingThreads classI think the paint method is wrong, but it all seems logical.. x starts off in the left side, moves to the right side by 10, when x + 50 == d.width, the oval is at the right edge, and speed = -10, so it should be moving to the left by 10, but instead, the oval disappears.. :( can anyone help?
public void paint (Graphics g)
int speed = 10;
Dimension d = getSize ();
g.fillOval (x, d.height / 4, 50, 50);
x = x + speed;
if (x + 50 == d.width)
speed = -10;
}public void paint (Graphics g)
int speed = 10;
Dimension d = getSize ();
g.fillOval (x, d.height / 4, 50, 50);
x = x + speed;
if (x + 50 == d.width)
speed = -10;
}So you are setting speed to -10, and then you are
leaving paint?
Can not see this having any impact on processing...Im setting speed to -10 because I want the oval to go left.... But it wont, after the oval goes from left to right, it disappears..
Try changing the following:
if (x + 50 == d.width)
speed = -10;to
if (x + 50 >= d.width)
speed = -10;
Tried changing that before, oval disappears after it goes to right side :\ -
A problem with Threads and loops.
Hi, I have some code that needs to be constantly running, like while(true)
//code here
}However, the code just checks to see if the user has input anything (and then if the user has, it goes to do some other stuff) so I don't need it constantly running and hogging up 98% of the CPU. So I made my class (which has the method that needs to be looped, call it ClassA) implement Runnable. Then I just added the method which needed to be looped into the public void run()
I have another class which creates an instance of the above class (call it ClassB), and the main(String[] args) is in there.
public static void main(String[] args)
ClassA test = new ClassA();
Thread thread = new Thread(test.getInstanceOfClassA());
thread.start();
while(true)
//I do not know what to put here
try
thread.sleep(100);
catch(InterruptedException iex)
}However, the thread only calls run() once,(duh...) but I can't think of away to get it to run - sleep - run -sleep forever. Can someone help me?Hi, I have some code that needs to be constantly
running, like while(true)
//code here
}However, the code just checks to see if the user has
input anything (and then if the user has, it goes to
do some other stuff) so I don't need it constantly
running and hogging up 98% of the CPU. Where does the user input come from. Are you reading from an InputStream? If so, then your loop will be blocked anyway when reading from the InputStream until data is available. During that time, the loop will not consume processor cycles.
public static void main(String[] args)
ClassA test = new ClassA();
Thread thread = new Thread(test.getInstanceOfClassA());I have never seen this idiom. If ClassA instanceof Runnable, you simply write new Thread(test).
thread.start();
while(true)
//I do not know what to put
do not know what to put here
try
thread.sleep(100);
catch(InterruptedException iex)
}However, the thread only calls run() once,(duh...)Yeah, why would you want to call it more than once given that you have an infinite loop in ClassA.run()?
Harald.
Java Text Crunching: http://www.ebi.ac.uk/Rebholz-srv/whatizit/software -
A problem with Threads and MMapi
I am tring to execute a class based on Game canvas.
The problem begin when I try to Play both a MIDI tone and to run an infinit Thread loop.
The MIDI tone "Stammers".
How to over come the problem?
Thanks in advance
Kobi
See Code example below:
import java.io.IOException;
import java.io.InputStream;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.media.Manager;
import javax.microedition.media.MediaException;
import javax.microedition.media.Player;
public class MainScreenCanvas extends GameCanvas implements Runnable {
private MainMIDlet parent;
private boolean mTrucking = false;
Image imgBackgound = null;
int imgBackgoundX = 0, imgBackgoundY = 0;
Player player;
public MainScreenCanvas(MainMIDlet parent)
super(true);
this.parent = parent;
try
imgBackgound = Image.createImage("/images/area03_bkg0.png");
imgBackgoundX = this.getWidth() - imgBackgound.getWidth();
imgBackgoundY = this.getHeight() - imgBackgound.getHeight();
catch(Exception e)
System.out.println(e.getMessage());
* starts thread
public void start()
mTrucking = true;
Thread t = new Thread(this);
t.start();
* stops thread
public void stop()
mTrucking = false;
public void play()
try
InputStream is = getClass().getResourceAsStream("/sounds/scale.mid");
player = Manager.createPlayer(is, "audio/midi");
player.setLoopCount(-1);
player.prefetch();
player.start();
catch(Exception e)
System.out.println(e.getMessage());
public void run()
Graphics g = getGraphics();
play();
while (true)
tick();
input();
render(g);
* responsible for object movements
private void tick()
* response to key input
private void input()
int keyStates = getKeyStates();
if ((keyStates & LEFT_PRESSED) != 0)
imgBackgoundX++;
if (imgBackgoundX > 0)
imgBackgoundX = 0;
if ((keyStates & RIGHT_PRESSED) != 0)
imgBackgoundX--;
if (imgBackgoundX < this.getWidth() - imgBackgound.getWidth())
imgBackgoundX = this.getWidth() - imgBackgound.getWidth();
* Responsible for the drawing
* @param g
private void render(Graphics g)
g.drawImage(imgBackgound, imgBackgoundX, imgBackgoundY, Graphics.TOP | Graphics.LEFT);
this.flushGraphics();
}You can also try to provide a greater Priority to your player thread so that it gains the CPU time when ever it needs it and don't harm the playback.
However a loop in a Thread and that to an infinite loop is one kind of very bad programming, 'cuz the loop eats up most of your CPU time which in turn adds up more delays of the execution of other tasks (just as in your case it is the playback). By witting codes bit efficiently and planning out the architectural execution flow of the app before start writing the code helps solve these kind of issues.
You can go through [this simple tutorial|http://oreilly.com/catalog/expjava/excerpt/index.html] about Basics of Java and Threads to know more about threads.
Regds,
SD
N.B. And yes there are more articles and tutorials available but much of them targets the Java SE / EE, but if you want to read them here is [another great one straight from SUN|http://java.sun.com/docs/books/tutorial/essential/concurrency/index.html] .
Edited by: find_suvro@SDN on 7 Nov, 2008 12:00 PM -
Hi all,
I would like to ask you for a help. I need to write a small program at my university. I started to write a midlet which function would be to countdown time for sports activities. I woul like to start a new thread - the one that counts down - and at the same time make the main thread sleep. After the "countdown" thread finishes, the main thread wakes up and waits for user input. The problem is that when the "countdown" thread finishes his work, I've got Uncaught exception java/lang/NullPointerException. error and the midlet halts.
Below you can find the code
import java.lang.*;
import java.util.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class intervals extends MIDlet implements CommandListener
public Display ekran;
private SweepCanvas sweeper;
private Form rundy;
private TextField round0, round1, round2, round3, round4, round5, round6, round7, round8;
private long czas,x;
private Command exitCommand;
private Command addRound;
private Command delRound;
private Command start;
private TextField repeat;
private Form odliczanie;
private Alert ostrz;
Licznik thread;
String test;
StringItem test1;
int parz,i,j,k;
static int l;
int ilrund;
int ilpowt;
Item sec;
long sec1;
public intervals()
rundy = new Form("Interwały sportowe");
exitCommand = new Command("Wyjście", Command.EXIT, 2);
addRound = new Command("Dodaj","Dodaj rundę", Command.ITEM,1);
delRound = new Command("Usuń","Usuń ostatnią rundę", Command.ITEM,1);
start = new Command("Start", Command.ITEM,1);
odliczanie = new Form("Odliczanie");
TextField dodaj(TextField kolej)
kolej=new TextField("Podaj czas (s) rundy "+parz,null, 4, TextField.NUMERIC);//stworzenie nowej instancji do wybierania czasu trwania rundy
if(rundy.size()==0)
rundy.insert(rundy.size(),kolej);
else
rundy.insert(rundy.size()-1, kolej);
return kolej;
void odliczanie(TextField round)
monitor m=new monitor();
k=Integer.parseInt(round.getString());
ekran.setCurrent(odliczanie);
thread=new Licznik(k,odliczanie);
thread.start();
ekran.setCurrent(rundy);
public void startApp()// throws MIDletStateChangeException
rundy.deleteAll();
repeat = new TextField("Podaj ilość powtórzeń",null,1,TextField.NUMERIC);
rundy.addCommand(addRound);
rundy.addCommand(exitCommand);
rundy.setCommandListener(this);
Canvas obrazek = new MyCanvas();
ekran = Display.getDisplay(this);
ekran.setCurrent(obrazek);
czas=System.currentTimeMillis();
while (System.currentTimeMillis()<czas+1000)
continue;
ekran.setCurrent(rundy);
public void pauseApp()
public void destroyApp(boolean unconditional)
notifyDestroyed();
public void commandAction(Command c, Displayable s)
if (c == exitCommand)
destroyApp(false);
notifyDestroyed();
else if(c==addRound)
if(rundy.size()==0)//Sprawdzenie ilości elementów w celu poprawnego wyświetlania liczby rund w formie
parz=1;
else
parz=rundy.size();
switch(parz)
case 1:
round0=dodaj(round0);break;
case 2:
round1=dodaj(round1);break;
case 3:
round2= dodaj(round2);break;
case 4:
round3=dodaj(round3);break;
case 5:
round4=dodaj(round4);break;
default:
ostrz=new Alert("Uwaga","Maksymalna liczba rund wynosi 9", null, AlertType.INFO);
ostrz.setTimeout(3000);
ekran.setCurrent(ostrz);
if(rundy.size()==1)
rundy.append(repeat);
rundy.addCommand(start);
rundy.addCommand(delRound);
else if(c==delRound)
if(rundy.size()!=0)
rundy.delete(rundy.size()-2);
if (rundy.size()==1)
rundy.deleteAll();
if(rundy.size()==0)
rundy.removeCommand(delRound);
rundy.removeCommand(start);
else if(c==start)
ilrund=rundy.size()-1;
if(this.repeat.size()>0)
ilpowt=Integer.parseInt(this.repeat.getString());
ekran = Display.getDisplay(this);
for (i=1; i<=ilpowt;i++)
odliczanie= new Form("Odliczanie");
for (j=0;j<ilrund;j++)
switch(j)
case 0:
odliczanie(round0);
break;
case 1:
odliczanie(round1);
break;
case 2:
odliczanie(round2);
break;
case 3:
odliczanie(round3);
break;
case 4:
odliczanie(round4);
break;
case 5:
odliczanie(round5);
break;
case 6:
odliczanie(round6);
break;
case 7:
odliczanie(round7);
break;
case 8:
odliczanie(round8);
break;
class Licznik extends Thread
int czas1,k;
Form forma;
monitor m;
public Licznik(int k,Form formap)
czas1=k;
forma=formap;
public synchronized void run()
while(czas1>0)
forma.deleteAll();
forma.append("Czas pozostały (s): "+czas1);
try{Thread.sleep(1000);} catch(InterruptedException e){e.printStackTrace();}
czas1--;
if(czas1<=0)
m.put();
}and monitor class
public class monitor
boolean busy=false;
synchronized void get()
if(!busy)
try
wait();
}catch(InterruptedException e){e.printStackTrace();}
notify();
synchronized void put()
if(busy)
try
wait();
}catch(InterruptedException e){e.printStackTrace();}
busy=true;
notify();
}Can anybody help me with this?Groovemaker,
Your Licznik class has a member m of type monitor, which has not been instantiated (in other words is null) hence, when calling m.put() you get NullPointerException. Please also mind, that using Thread.sleep(1000) is not an accurate way of measuring time.
If I may, please use recommended for Java class naming conventions - some of your names use lower case, while other don't which is confusing to the reader.
Daniel -
Problem with threads within applet
Hello,
I got an applet, inside this applet I have a singleton, inside this singleton I have a thread.
this thread is running in endless loop.
he is doing something and go to sleep on and on.
the problem is,
when I refresh my IE6 browser I see more than 1 thread.
for debug matter, I did the following things:
inside the thread, sysout every time he goes to sleep.
sysout in the singleton constructor.
sysout in the singleton destructor.
the output goes like this:
when refresh the page, the singleton constructor loading but not every refresh, sometimes I see the constructor output and sometimes I dont.
The thread inside the singleton is giving me the same output, sometime I see more than one thread at a time and sometimes I dont.
The destructor never works (no output there).
I don't understand what is going on.
someone can please shed some light?
thanks.
btw. I am working with JRE 1.1
this is very old and big applet and I can't convert it to something new.Ooops. sorry!
I did.
public void start() {
public void stop() {
public void destroy() {
try {
resetAll();
Configuration.closeConnection();
QuoteItem.closeConnection();
} finally {
try {
super.finalize();
} catch (Throwable e) {
e.printStackTrace();
} -
Problem with Threads and a static variable
I have a problem with the code below. I am yet to make sure that I understand the problem. Correct me if I am wrong please.
Code functionality:
A timer calls SetState every second. It sets the state and sets boolean variable "changed" to true. Then notifies a main process thread to check if the state changed to send a message.
The problem as far I understand is:
Assume the timer Thread calls SetState twice before the main process Thread runs. As a result, "changed" is set to true twice. However, since the main process is blocked twice during the two calls to SetState, when it runs it would have the two SetState timer threads blocked on its synchronized body. It will pass the first one, send the message and set "changed" to false since it was true. Now, it will pass the second thread, but here is the problem, "changed" is already set to false. As a result, it won't send the message even though it is supposed to.
Would you please let me know if my understanding is correct? If so, what would you propose to resolve the problem? Should I call wait some other or should I notify in a different way?
Thanks,
B.D.
Code:
private static volatile boolean bChanged = false;
private static Thread objMainProcess;
protected static void Init(){
objMainProcess = new Thread() {
public void run() {
while( objMainProcess == Thread.currentThread() ) {
GetState();
objMainProcess.setDaemon( true );
objMainProcess.start();
public static void initStatusTimer(){
if(objTimer == null)
objTimer = new javax.swing.Timer( 1000, new java.awt.event.ActionListener(){
public void actionPerformed( java.awt.event.ActionEvent evt){
SetState();
private static void SetState(){
if( objMainProcess == null ) return;
synchronized( objMainProcess ) {
bChanged = true;
try{
objMainProcess.notify();
}catch( IllegalMonitorStateException e ) {}
private static boolean GetState() {
if( objMainProcess == null ) return false;
synchronized( objMainProcess ) {
if( bChanged) {
SendMessage();
bChanged = false;
return true;
try {
objMainProcess.wait();
}catch( InterruptedException e ) {}
return false;
}Thanks DrClap for your reply. Everything you said is right. It is not easy to make them alternate since SetState() could be called from different places where the state could be anything else but a status message. Like a GREETING message for example. It is a handshaking message but not a status message.
Again as you said, There is a reason I can't call sendMessage() inside setState().
The only way I was able to do it is by having a counter of the number of notifies that have been called. Every time notify() is called a counter is incremented. Now instead of just checking if "changed" flag is true, I also check if notify counter is greater than zero. If both true, I send the message. If "changed" flag is false, I check again if the notify counter is greater than zero, I send the message. This way it works, but it is kind of a patch than a good design fix. I am yet to find a good solution.
Thanks,
B.D. -
Problem with threads, program always crash
new to threads, may be doing something COMPLETELY wrong. When I run the program I get a couple of NullPointerExceptions in Thread-0 and Thread-1. I'm confused because it screws up when I call size() for arrayList, and in the API size doesn't throw anything.
public class ProducerConsumerRunner
public static void main(String args[])
Queue q = new Queue(QUEUE_MAX_SIZE);
ProducerRunnable producer = new ProducerRunnable(q, ITERATIONS);
ConsumerRunnable consumer = new ConsumerRunnable(q, ITERATIONS);
//works good up to here
Thread t1 = new Thread(producer);
Thread t2 = new Thread(consumer);
t1.start();
t2.start();
private static int ITERATIONS = 50;
private static int QUEUE_MAX_SIZE = 25;
import java.util.ArrayList;
import java.util.concurrent.locks.ReentrantLock;
public class Queue {
public Queue(int maxSize)
list = new ReentrantLock();
underLimit = list.newCondition();
MAX_SIZE = maxSize;
public void add(String line)
list.lock();
try{
System.out.println("add method of Queue");
while(record.size() >= MAX_SIZE){//things get screwed up when this condition is evaluated
//size method is crashing the program
System.out.println("2");
underLimit.await();
System.out.println("3");
record.add(line);
}catch(java.lang.InterruptedException e){
System.out.println("await interupted: "+e.getMessage());
}finally{
list.unlock();
public void remove(int line)
list.lock();
record.remove(line);
list.unlock();
public ArrayList<String> record;
private final ReentrantLock list;
private final java.util.concurrent.locks.Condition underLimit;
private final int MAX_SIZE;
import java.util.Date;
public class ProducerRunnable implements Runnable{
public ProducerRunnable(Queue q, int itterations)
this.q = q;
ITTERATIONS = itterations;
public void run()
String date;
for(int i = 0; i<ITTERATIONS; i++)
date = new Date().toString();
q.add(date);//this is where it screws up
System.out.println(date+" added");
try{
Thread.sleep(100);
}catch(java.lang.InterruptedException e){
System.out.println("ProduccerRunnable's sleep was interupted");
private final Queue q;
private final int ITTERATIONS;
public class ConsumerRunnable implements Runnable{
public ConsumerRunnable(Queue q, int itterations)
this.q = q;
ITTERATIONS = itterations;
public void run()
//Queue q = new Queue();
int length;
for(int i = 0; i<ITTERATIONS; i++)
length = q.record.size();//things are getting screwed up here
while(q.record.get(length) == null)
length--;
System.out.println((String)q.record.get(length));
q.remove(length);
try{
Thread.sleep(100);
}catch(java.lang.InterruptedException e){
System.out.println("ConsumerRunnable's sleep was interupted");
private final Queue q;
private final int ITTERATIONS;
}question:
this works right
public void remove()
list.lock();
int line = 0;
try{
*while(record.size() < 1)*
range.await();
record.remove(line);
range.signalAll();
}catch(java.lang.InterruptedException e){
System.out.println("await interupted: "+e.getMessage());
}finally{
list.unlock();
}this is deadlock
*int list = 0;*
*while((list = record.size)<1) was screwing things up because of the assignment*record is ArrayList of strings. when better to use Vector instead of ArrayList? i notice no differnce and i use threads
initially I thought record.size was being evaluated and before could be assigned to list, time slice ran out. this could not be case because I use ReentrantLock (list) to lock it.
Edited by: bean-planet on Apr 1, 2009 4:31 PM -
Problem with threads running javaw
Hi,
Having a problem with multi thread programming using client server sockets. The program works find when starting the the application in a console using java muti.java , but when using javaw multi.java the program doesnt die and have to kill it in the task manager. The program doesnt display any of my gui error messages either when the server disconnect the client. all works find in a console. any advice on this as I havent been able to understand why this is happening? any comment would be appreciated.
troy.troy,
Try and post a minimum code sample of your app which
does not work.
When using javaw, make sure you redirect the standard
error and standard output streams to file.
Graeme.Hi Graeme,
I dont understand what you mean by redirection to file? some of my code below.
The code works fine under a console, code is supposed to exit when the client (the other server )disconnects. the problem is that but the clientworker side of the code still works. which under console it doesnt.
public class Server{
ServerSocket aServerSocket;
Socket dianosticsSocket;
Socket nPortExpress;
ClientListener aClientListener;
LinkedList queue = new LinkedList();
int port = 0;
int clientPort = 0;
String clientName = null;
boolean serverAlive = true;
* Server constructor generates a server
* Socket and then starts a client threads.
* @param aPort socket port of local machine.
public Server(int aPort, String aClientName, int aClientPort){
port = aPort;
clientName = aClientName;
clientPort = aClientPort;
try{
// create a new thread
aServerSocket = new ServerSocket(port) ;
// connect to the nPortExpress
aClientListener = new ClientListener(InetAddress.getByName(clientName), clientPort, queue,this);
// aClientListener.setDaemon(true);
aClientListener.start();
// start a dianostic port
DiagnosticsServer aDiagnosticsServer = new DiagnosticsServer(port,queue,aClientListener);
// System.out.println("Server is running on port " + port + "...");
// System.out.println("Connect to nPort");
catch(Exception e)
// System.out.println("ERROR: Server port " + port + " not available");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Server port " + port + " not available", JOptionPane.ERROR_MESSAGE);
serverAlive = false;
System.exit(1);
while(serverAlive&&aClientListener.hostSocket.isConnected()){
try{
// connect the client
Socket aClient = aServerSocket.accept();
//System.out.println("open client connection");
//System.out.println("client local: "+ aClient.getLocalAddress().toString());
// System.out.println("client localport: "+ aClient.getLocalPort());
// System.out.println("client : "+ aClient.getInetAddress().toString());
// System.out.println("client port: "+ aClient.getLocalPort());
// make a new client thread
ClientWorker clientThread = new ClientWorker(aClient, queue, aClientListener, false);
// start thread
clientThread.start();
catch(Exception e)
//System.out.println("ERROR: Client connection failure");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Client connection failure", JOptionPane.ERROR_MESSAGE);
}// end while
} // end constructor Server
void serverExit(){
JOptionPane.showMessageDialog(null, "Server ","ERROR: nPort Failure", JOptionPane.ERROR_MESSAGE);
System.exit(1);
}// end class Server
*** connect to another server
public class ClientListener extends Thread{
InetAddress hostName;
int hostPort;
Socket hostSocket;
BufferedReader in;
PrintWriter out;
boolean loggedIn;
LinkedList queue; // reference to Server queue
Server serverRef; // reference to main server
* ClientListener connects to the host server.
* @param aHostName is the name of the host eg server name or IP address.
* @param aHostPort is a port number of the host.
* @param aLoginName is the users login name.
public ClientListener(InetAddress aHostName, int aHostPort,LinkedList aQueue,Server aServer) // reference to Server queue)
hostName = aHostName;
hostPort = aHostPort;
queue = aQueue;
serverRef = aServer;
// connect to the server
try{
hostSocket = new Socket(hostName, hostPort);
catch(IOException e){
//System.out.println("ERROR: Connection Host Failed");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Connection to nPort Failed", JOptionPane.ERROR_MESSAGE);
System.exit(0);
} // end constructor ClientListener
** multi client connection server
ClientWorker(Socket aSocket,LinkedList aQueue, ClientListener aClientListener, boolean diagnostics){
queue = aQueue;
addToQueue(this);
client = aSocket;
clientRef = aClientListener;
aDiagnostic = diagnostics;
} // end constructor ClientWorker
* run method is the main loop of the server program
* in change of handle new client connection as well
* as handle all messages and errors.
public void run(){
boolean alive = true;
String aSubString = "";
in = null;
out = null;
loginName = "";
loggedIn = false;
while (alive && client.isConnected()&& clientRef.hostSocket.isConnected()){
try{
in = new BufferedReader(new InputStreamReader(client.getInputStream()));
out = new PrintWriter(new OutputStreamWriter(client.getOutputStream()));
if(aDiagnostic){
out.println("WELCOME to diagnostics");
broadCastDia("Connect : diagnostics "+client.getInetAddress().toString());
out.flush();
else {
out.println("WELCOME to Troy's Server");
broadCastDia("Connect : client "+client.getInetAddress().toString());
out.flush();
String line;
while(((line = in.readLine())!= null)){
StringTokenizer aStringToken = new StringTokenizer(line, " ");
if(!aDiagnostic){
broadCastDia(line);
clientRef.sendMessage(line); // send mesage out to netExpress
out.println(line);
out.flush();
else{
if(line.equals("GETIPS"))
getIPs();
else{
clientRef.sendMessage(line); // send mesage out to netExpress
out.println(line);
out.flush();
} // end while
catch(Exception e){
// System.out.println("ERROR:Client Connection reset");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR:Client Connection reset", JOptionPane.ERROR_MESSAGE);
try{
if(aDiagnostic){
broadCastDia("Disconnect : diagnostics "+client.getInetAddress().toString());
out.flush();
else {
broadCastDia("Disconnect : client "+client.getInetAddress().toString());
out.flush();
// close the buffers and connection;
in.close();
out.close();
client.close();
// System.out.println("out");
// remove from list
removeThreadQueue(this);
alive = false;
catch(Exception e){
// System.out.println("ERROR: Client Connection reset failure");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Client Connection reset failure", JOptionPane.ERROR_MESSAGE);
}// end while
} // end method run
* method run - Generates io stream for communicating with the server and
* starts the client gui. Run also parses the input commands from the server.
public void run(){
boolean alive = true;
try{
// begin to life the gui
// aGuiClient = new ClientGui(hostName.getHostName(), hostPort, loginName, this);
// aGuiClient.show();
in = new BufferedReader(new InputStreamReader(hostSocket.getInputStream()));
out = new PrintWriter(new OutputStreamWriter(hostSocket.getOutputStream()));
while (alive && hostSocket.isConnected()){
String line;
while(((line = in.readLine())!= null)){
System.out.println(line);
broadCast(line);
} // end while
} // end while
catch(Exception e){
// System.out.println("ERRORa Connection to host reset");
JOptionPane.showMessageDialog(null, (e.toString()),"ERROR: Connection to nPort reset", JOptionPane.ERROR_MESSAGE);
try{
hostSocket.close();
}catch(Exception a){
JOptionPane.showMessageDialog(null, (a.toString()),"ERROR: Exception", JOptionPane.ERROR_MESSAGE);
alive = false;
System.exit(1);
} // end method run -
Problem with Threads and "plase wait..."-Window
Hi everyone,
I have a problem that I'm not able to solve in any way... I have a time-consuming task (a file decryption) which I execute in a separate thread; I've used the SwingWorker class, like suggested by sun-tutorial, and it works right. The problem is that I have to wait that the decryption have finished before continuing with program-execution. Therefore I would like to display a "please wait"-window while the task runs. I've tryed all the possible ways I know but the problem is always the same: the waitWindow is displayed empty, the bounds are painted but the contents no; it's only painted when the decrypt-task has finished. Please help me, I have no more resources....
decrypt-file code:
public class DecryptFile {
private String cryptedFileNameAndPath;
private ByteArrayInputStream resultStream = null;
// need for progress
private int lengthOfTask;
private int current = -1;
private String statMessage;
public DecryptFile(String encZipFileNameAndPath) {
cryptedFileNameAndPath = encZipFileNameAndPath;
//Compute length of task...
// 0 for indeterminate
lengthOfTask = 0;
public ByteArrayInputStream getDecryptedInputStream() {
return this.resultStream;
* Called from ProgressBarDemo to start the task.
public void go() {
current = -1;
final SwingWorker worker = new SwingWorker() {
public Object construct() {
return new ActualTask();
worker.start();
* Called from ProgressBarDemo to find out how much work needs
* to be done.
public int getLengthOfTask() {
return lengthOfTask;
* Called from ProgressBarDemo to find out how much has been done.
public int getCurrent() {
return current;
public void stop() {
current = lengthOfTask;
* Called from ProgressBarDemo to find out if the task has completed.
public boolean done() {
if (current >= lengthOfTask)
return true;
else
return false;
public String getMessage() {
return statMessage;
* The actual long running task. This runs in a SwingWorker thread.
class ActualTask {
ActualTask () {
current = -1;
statMessage = "";
resultStream = AIUtil.getInputStreamFromEncZip(cryptedFileNameAndPath); //here the decryption happens
current = 0;
statMessage = "";
}The code that calls decryption and displays waitWindow
final WaitSplash wS = new WaitSplash("Please wait...");
final DecryptFile cryptedTemplate = new DecryptFile (this.templateFile);
cryptedTemplate.go();
while (! cryptedTemplate.done()) {
try {
wait();
} catch (Exception e) { }
this.templateInputStream = cryptedTemplate.getDecryptedInputStream();
wS.close();Thanks, thanks, thanks in advance!
EdoardoMaybe you can try setting the priority of the long-running thread to be lower? so that the UI will be more responsive...
-
Problem with threads and simulation: please help
please help me figure this out..
i have something like this:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class DrawShapes extends JApplet{
private JButton choices[];
private String names[]={"line", "square", "oval"};
private JPanel buttonPanel;
private DrawPanel drawingArea;
private int width=300, height=200;
public void init(){
drawingArea=new DrawPanel(width, height);
choices=new JButton[names.length];
buttonPanel=new JPanel();
buttonPanel.setLayout(new GridLayout(1, choices.length));
ButtonHandler handler=new ButtonHandler();
for(int i=0; i<choices.length; i++){
choices=new JButton(names[i]);
buttonPanel.add(choices[i]);
choices[i].addActionListener(handler);
Container c=getContentPane();
c.add(buttonPanel, BorderLayout.NORTH);
c.add(drawingArea, BorderLayout.CENTER);
}//end init
public void setWidth(int w){
width=(w>=0 ? w : 300);
public void setHeight(int h){
height=(h>=0 ? h : 200);
/*public static void main(String args[]){
int width, height;
if(args.length!=2){
height=200; width=300;
else{
width=Integer.parseInt(args[0]);
height=Integer.parseInt(args[1]);
JFrame appWindow=new JFrame("An applet running as an application");
appWindow.addWindowListener(
new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
DrawShapes appObj=new DrawShapes();
appObj.setWidth(width);
appObj.setHeight(height);
appObj.init();
appObj.start();
appWindow.getContentPane().add(appObj);
appWindow.setSize(width, height);
appWindow.show();
}//end main*/
private class ButtonHandler implements ActionListener{
public void actionPerformed(ActionEvent e){
for(int i=0; i<choices.length; i++){
if(e.getSource()==choices[i]){
drawingArea.setCurrentChoice(i);
break;
}//end class DrawShapes
class DrawPanel extends JPanel{
private int currentChoice=-1;
private int width=100, height=100;
public DrawPanel(int w, int h){
width=(w>=0 ? w : 100);
height=(h>=0 ? h : 100);
public void paintComponent(Graphics g){
super.paintComponent(g);
switch(currentChoice){
case 0: g.drawLine(randomX(), randomY(), randomX(), randomY());
break;
case 1: g.drawRect(randomX(), randomY(), randomX(), randomY());
break;
case 2: g.drawOval(randomX(), randomY(), randomX(), randomY());
break;
public void setCurrentChoice(int c){
currentChoice=c;
repaint();
private int randomX(){
return (int) (Math.random()*width);
private int randomY(){
return (int) (Math.random()*height);
}//end class drawPanel
That one's from a book. I used that code to start with my applet. Mine calls different merthod from the switch cases. Say I have:
case 0: drawStart(g); break;
public void drawStart(Graphics g){
/* something here */
drawMain(g);
public void drawMain(graphics g){
g.drawString("test", x, y);
//here's where i'm trying to pause
//i've tried placing Thread.sleep between these lines
g.drawLine(x, y, a, b);
//Thread.sleep here
g.drawRect(x, y, 50, 70);
}I also need to put delays between method calls but I need to synchronize them. Am I doing it all wrong? The application pauses or sleeps but afterwards, it still drew everything all at once. Thanks a lot!It is. Sorry about that. Just answer any if you want to. I'd appreciate your help. Sorry again if it caused you anything or whatever. .n_n.
-
im using jdk 1.6 with java wtk 2.1
ya i know..
2.1 is a jdk1.4 source
but im using souce as 1.4 during compiliation so thats not the prob
this is my code
package org.learn;
import javax.microedition.midlet.MIDlet;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.Display;
public class thtest extends MIDlet
Thread t;
public void startApp()
Alert a=new Alert("hello");
a.setString("hello");
Alert b=new Alert("world");
b.setString("world");
Display d = Display.getDisplay(this );
d.setCurrent(a);
t=Thread.currentThread();
try{
t.sleep(10000);
catch (Exception e){}
d.setCurrent(b);
public void pauseApp()
public void destroyApp(boolean unconditional)
its just supposed to pause between the alerts using threads
however when i run it using the wtk, the emulator run properly but when i launch the app, it stops executing giving me this:
"Error verifying method org/learn/thtest startApp()V
Approximate bytecode offset 49: Inconsistent or missing stackmap at target
%the stack info%
Execution completed.
437782 bytecodes executed
9 thread switches
486 classes in the system (including system classes)
2506 dynamic objects allocated (73832 bytes)
2 garbage collections (60652 bytes collected)
Execution completed.
437782 bytecodes executed
9 thread switches
486 classes in the system (including system classes)
ALERT: java/lang/VerifyError: org/learn/thtest.
2506 dynamic objects allocated (73832 bytes)
2 garbage collections (60652 bytes collected)
please can someone help me out with this, is it an error on my part or do i have to set some option.Hi gandalf123,
First, Thread.sleep is a static method, so you don't need to create a Thread object to use it.
I think the problem is due to the fact you don't preverify your midlet.
More over, you don't need to double post your question. -
Problem with threads and camera.
Hi everybody!
I've a problem with taking snapshot.
I would like to display a loading screen after it take snapshot ( sometimes i
have to wait few seconds after i took snapshot. Propably photo is being taken in time where i have to wait).
I was trying to use threads but i didn't succeed.
I made this code:
display.setCurrent(perform);
new Thread(new Runnable(){
public void run() {
while((!performing.isShown()) && (backgroundCamera.isShown())){
Thread.yield();
notifyAll();
}).start();
new Thread(new Runnable(){
public void run() {
try {
this.wait();
} catch(Exception e) {
exceptionHandler(e);
photo = camera.snapshot();
display.setCurrent(displayPhoto);
}).start();This code is sometimes showing performing screen but sometimes no.
I don't know why. In my opinion performing.isShown() method isn't working correctly.
Does anyone have some idea how to use threads here?Hi,
I've finally managed to work this fine.
The code:
Object o = new Object();
display.setCurrent(perform);
new Thread(new Runnable(){
public void run() {
while(!performing.isShown()){
Thread.yield();
synchronized(o) {
o.notify();
}).start();
new Thread(new Runnable(){
public void run() {
try {
synchronized(o) {
o.wait(1);
} catch(Exception e) {
exceptionHandler(e);
photo = camera.snapshot();
display.setCurrent(displayPhoto);
}).start(); -
We have a problem where our application stops responding after a few days of usage. Things will for fine for a day or two, and then pretty quickly threads will start getting hung up, usually in places where they are allocating memory
We are running WebLogic 8.1 SP2 on Sun JDK 1.4.2_04 on Solaris 8 using the alternate threading model and the -server hotspot vm. We are running pretty much the same code that we had no problems with under WebLogic 6.1 SP4 and Sun JDK 1.3.1.
A thread dump usually shows that some or all of our execute threads are in the state "waiting for monitor entry" even though they are not currently waiting on any java locks. Here is a sample thread from the thread dump (we have ~120 threads so I don't want to post the full dump).
=============================================================================================
"ExecuteThread: '8' for queue: 'itgCrmWarExecutionQueue'" daemon prio=5 tid=0x005941d0 nid=0x2c waiting for monitor entry [c807f000..c807fc28]
at java.lang.String.substring(String.java:1446)
at java.lang.String.substring(String.java:1411)
at weblogic.servlet.internal.ServletRequestImpl.getRelativeUri(ServletRequestImpl.java:1872)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3492)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2585)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
=============================================================================================
String.java line 1446 for this jdk allocates a new String object, and all the other threads in this state also are creating new objects or arrays, etc.
We've done a pstack on this process when it's in this state, and the threads that are in the "waiting for monitor entry" that look like they're allocating memory are all waiting on the same lwp_mutex_lock with some allocation method that's calling into the native TwoGenerationCollectorPolicy.mem_allocate_work (see pstack output below for the same thread as in the thread dump above)
=============================================================================================
----------------- lwp# 44 / thread# 44 --------------------
ff31f364 lwp_mutex_lock (e3d70)
fee92384 __1cNObjectMonitorGenter26MpnGThread__v_ (5000, 525c, 5000, 50dc, 4800, 4af0) + 2d8
fee324d4 __1cSObjectSynchronizerKfast_enter6FnGHandle_pnJBasicLock_pnGThread__v_ (c807f65c, c807f7d4, 5941d0, 0, 35d654, fee328ec) + 68
fee32954 __1cQinstanceRefKlassZacquire_pending_list_lock6FpnJBasicLock__v_ (c807f7d4, ff170000, d4680000, 4491d4, fee1bc2c,
0) + 78
fee3167c __1cPVM_GC_OperationNdoit_prologue6M_i_ (c807f7bc, 4400, ff170000, 2d2b8, 4a6268, c807fa18) + 38
fee2e0b0 __1cIVMThreadHexecute6FpnMVM_Operation__v_ (c807f7bc, 963a8, 0, 0, 1, 0) + 90
fed2c2a4 __1cbCTwoGenerationCollectorPolicyRmem_allocate_work6MIii_pnIHeapWord__ (962c0, ff1c29ec, ff1c297c, ff131a26, 4800, 4998) + 160
fed22940 __1cNinstanceKlassRallocate_instance6MpnGThread__pnPinstanceOopDesc__ (ee009020, 5941d0, 15ca581, 3647f0, 4a6268, c807f8c8) + 180
fed34928 __1cLOptoRuntimeFnew_C6FpnMklassOopDesc_pnKJavaThread__v_ (ee009018, 5941d0, 0, 0, 0, 0) + 28
fa435a58 ???????? (ee009018, e86de, 15ca4de, 50dc, 5941d0, c807f9c8)
fb36f9a4 ???????? (0, d412ccd8, ee046c28, ff170000, 0, 0)
fad8b278 ???????? (ee046c28, d6000c90, ee046530, 8, db8e8450, c807f9e8)
fad62abc ???????? (d412ccd8, ee046530, d6000c90, ee3bfa38, 8, c807fa18)
fa4b3c38 ???????? (c807fb9c, 0, f2134700, fa415e50, 8, c807faa8)
fa40010c ???????? (c807fc28, c807fe90, a, ee9e1e20, 4, c807fb40)
fed5d48c __1cJJavaCallsLcall_helper6FpnJJavaValue_pnMmethodHandle_pnRJavaCallArguments_pnGThread__v_ (c807fe88, c807fcf0, c807fda8, 5941d0, 5941d0, c807fd00) + 27c
fee4b784 __1cJJavaCallsMcall_virtual6FpnJJavaValue_nLKlassHandle_nMsymbolHandle_4pnRJavaCallArguments_pnGThread__v_ (ff170000, 594778, c807fd9c, c807fd98, c807fda8, 5941d0) + 164
fee5e8dc __1cJJavaCallsMcall_virtual6FpnJJavaValue_nGHandle_nLKlassHandle_nMsymbolHandle_5pnGThread__v_ (c807fe88, c807fe84, c807fe7c, c807fe74, c807fe6c, 5941d0) + 6c
fee6fc74 __1cMthread_entry6FpnKJavaThread_pnGThread__v_ (5941d0, 5941d0, 838588, 594778, 306d10, fee69254) + 128
fee6927c __1cKJavaThreadDrun6M_v_ (5941d0, 2c, 40, 0, 40, 0) + 284
fee6575c _start (5941d0, fa1a1600, 0, 0, 0, 0) + 134
ff3758c0 lwpstart (0, 0, 0, 0, 0, 0)
=============================================================================================
Also when it's having this problem, the "VM Thread" is always using a lot of processor time. We did a couple of pstacks today while it was having this problem, and this thread was stuck in the ONMethodSweeper.sweep for over 15 minutes when we finally killed the server.
From the thread dump:
"VM Thread" prio=5 tid=0x000e2d20 nid=0x2 runnable
From the first pstack:
=============================================================================================
----------------- lwp# 2 / thread# 2 --------------------
fed40c04 __1cXvirtual_call_RelocationIparse_ic6FrpnICodeBlob_rpC5rppnHoopDesc_pi_nNRelocIterator__ (42a2f4, fa5fa46d, ffffffff, fc4ffcb8, 42a2f4, 42a324) + 124
fed46318 __1cKCompiledIC2t5B6MpnKRelocation__v_ (42a2f0, fc4ffd24, fc4ffd4c, e802, 0, 6) + 38
fed90c38 __1cHnmethodVcleanup_inline_caches6M_v_ (fa5f7f88, fa608940, 1, 0, fa400000, 6) + 1ac
fede18b4 __1cONMethodSweeperFsweep6F_v_ (2cf38, 0, ffffffff, ff1cf1fc, ff1c66e8, fede1d44) + 1b0
fede1e6c __1cUSafepointSynchronizeFbegin6F_v_ (2cf38, ff1ba138, 5000, 50dc, 5000, 525c) + 248
feef1fd4 __1cIVMThreadEloop6M_v_ (4400, 4000, 4324, 4000, 42b0, 3800) + 3d4
feef1ae4 __1cIVMThreadDrun6M_v_ (e2d20, 2, 40, 0, 40, 0) + 8c
fee6575c _start (e2d20, ff270200, 0, 0, 0, 0) + 134
ff3758c0 lwpstart (0, 0, 0, 0, 0, 0)
=============================================================================================
Second pstack
=============================================================================================
----------------- lwp# 2 / thread# 2 --------------------
fed41180 __1cXvirtual_call_RelocationIparse_ic6FrpnICodeBlob_rpC5rppnHoopDesc_pi_nNRelocIterator__ (0, ff1b9664, ffffffff, fc4ffcb8, a6f2cc, fc4ffbd0) + 6a0
fed46318 __1cKCompiledIC2t5B6MpnKRelocation__v_ (a6f2c8, fc4ffd24, fc4ffd4c, e802, 0, 6) + 38
fed90c38 __1cHnmethodVcleanup_inline_caches6M_v_ (faded4c8, fadf2c80, 1, 0, fa400000, 6) + 1ac
fede18b4 __1cONMethodSweeperFsweep6F_v_ (2cf38, 0, ffffffff, ff1cf1fc, ff1c66e8, fede1d44) + 1b0
fede1e6c __1cUSafepointSynchronizeFbegin6F_v_ (2cf38, ff1ba138, 5000, 50dc, 5000, 525c) + 248
feef1fd4 __1cIVMThreadEloop6M_v_ (4400, 4000, 4324, 4000, 42b0, 3800) + 3d4
feef1ae4 __1cIVMThreadDrun6M_v_ (e2d20, 2, 40, 0, 40, 0) + 8c
fee6575c _start (e2d20, ff270200, 0, 0, 0, 0) + 134
ff3758c0 lwpstart (0, 0, 0, 0, 0, 0)
=============================================================================================
Has anyone ever seen anything like this? I'm trying to figure out if this is caused by something we're doing, or something relating to our environment and jvm options. Any ideas?Thanks for the reply - I'm testing our app with the +UseConcMarkSweepGC now in our test environment to make sure it doesn't cause any problems there. Unfortunately the only place we've had this problem is on the production server, so it's extra difficult debugging this.
We're using the following memory options:
-ms512m -mx512m -XX:NewSize=128m -XX:PermSize=192m -XX:MaxNewSize=128m -XX:MaxPermSize=192m -XX:SurvivorRatio=8and the following debugging options, as we've also been seeing OutOfMemoryErrors ( see http://forum.java.sun.com/thread.jsp?forum=37&thread=522354&tstart=45&trange=15 )
-verbosegc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGCBTW, which c++filt version and options are you using? Our Solaris boxes only seem to have the GNU version installed. I was trying to run that on some of the other stack traces and wasn't getting anywhere, and didn't know if because it was GNU version wouldn't work on something compiled with the Sun compiler.
Thanks!
--Andy -
Problem with threads and ProgressMonitor
Dear Friends:
I have a little problem with a thread and a ProgressMonitor. I have a long time process that runs in a thread (the thread is in an separate class). The thread has a ProgressMonitor that works fine and shows the tasks progress.
But I need deactivate the main class(the main class is the user interface) until the thread ends.
I use something like this:
LongTask myTask=new LongTask();
myTask.start();
myTask.join();
Now, the main class waits for the task to end, but the progress monitor don`t works fine: it shows only the dialog but not the progress bar.
What's wrong?Is the dialog a modal dialog? This can block other UI updates.
In general, you should make sure that it isn't modal, and that your workThread has a fairly low priority so that the UI can do its updating
Maybe you are looking for
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I have 2 email accounts on my iPhone 4S. My secondary account is a gmail account. My primary account (not gmail) is set as my default account. Why, when I compose a new message in my primary account and then send, the email is issued from from gmail?
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Setting remote credentials in services-config.xml
Webservice and remoting calls can be restricted access to CFC's using usernames and passwords. And to 'authenticate', I'm having trouble setting the <remote-username> and <remote-password> elements in the services-config.xml A remoting fault event is
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System error -no entry in table T093 for the chart of depreciation or ccode
When checking Depreciation Areas of Company Codes in overview for experts (transaction SPRO) I first get a warning message inconsistent rounding entries were corrected. After saving once in the maintenance transaction (as recommended in the help
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Hi..i have a problem with adobe muse..i can t open it.i double click and is not opening..help please
hello!!i have a problem with adobe muse..i can t open it.i double click and is not opening..i don t think it s a problem from computer because adobe is the only i can t open ..a few hours ago i could open,and now i can t anymore..please help
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Handing off a call from the iPhone to the Mac using Continuity?
Why can't I hand off a call from my iPhone to my mac using continuity? Am I missing something? Does't seem to allow me to do this, just the other way around. Any suggestions?