I'm in the process of writing a piece of code that connects to a server spawns a bunch of threads using that connection and does a bunch of "stuff".
There are certain ... |
I have a web-application that only requires the servlet-container to run. My login page and front page do not have any backend transactions, but all others do. What'd be the simplest ... |
In a java application,when the user hits download,establishing the remote connection and downloading the content from remote is done in a separate thread and a dialog is popped up in the ... |
Mobile app provides the user with the option of downloading the email attachment from remote.Connecting with a remote server and downloading the content is carried out in a separate thread.A dialog ... |
I need to use deprecated stop () because I need to run Runnable classes which were developed by other programmers and I can't use while (isRunning == true) inside method run.
The ... |
I have made a java program with GUI and I want a stop button functionality in which when a user clicks on the stop button, the program must be stopped.
- In my ...
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i hava a program connect to server through xot (x25 over tcp/ip) protocol.
i have a thread to connect, send recv data with server using xot library.
public class MyThread extends Thread{
...
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Exposition:
I think the Java VM is awesome. It's guarantee of the safety of bytecode, the the standard libraries, ... are amazing, especially the ability to load a Java class on the ... |
I'm using a thread that is continuously reading from a queue.
Something like:
public void run() {
Object obj;
while(true) {
...
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I have a java.util.Timer running at a fixed interval. I have added a Runtime#addShutdownHook and it shuts down when the VM ends normally or abnormally. However, it keeps the VM alive ... |
the following code is server code in my app:
private int serverPort;
private Thread serverThread = null;
public void networkListen(int port){
serverPort = port;
if (serverThread == null){
...
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I have a thread in my screen recording application that won't cooperate:
package recorder;
import java.awt.AWTException;
import java.awt.Insets;
import java.io.IOException;
import javax.swing.JFrame;
public class RepeatThread extends Thread {
volatile boolean stop;
...
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I wrote a thread, it is taking too much time to execute and it seems it is not completely done. I want to stop the thread gracefully. Any help ?
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Here is the code I'm using.
public class timerApp {
Runnable timerRun = new runX();
Thread thread1 = new Thread(timerRun);
public static void main(String[] args) {
timerApp xyz = new timerApp();
...
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I am working on a project, where i need to get native stack of the Java Application. i am able to achieve this partially. thanks to ptrace/multiprocessing and signals.
on Linux normal ... |
I have a complex function (optimisation) that can potentially enter in a loop or just to take too much time, and the time allowed is set by the user.
Therefore I am ... |
I just learned from sun's document that when i invoke thread.stop() method, the run() method will be terminated as the ThreadDeath error thrown out, and also release all the locks this ... |
I have written an Ant target that starts Selenium server, runs my test code, and then... I would like it to stop the forked process (Selenium). How do I keep track ... |
I recently used a solution to the one-thread-at-a-time problem whe using Jlayer to play mp3 songs in Java. But this solution by Kaleb Brasee didn't hint at how you could stop ... |
I have an application that is meant to "run forever". To achieve that, my code is under a while(true) loop.
while(true){
//My code is here
//What it ...
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I had came across different suggestion of stopping a thread. May I know, which is the correct way? Or it depends?
Using Thread Variable http://download.oracle.com/javase/1.4.2/docs/guide/misc/threadPrimitiveDeprecation.html
private volatile Thread blinker;
public void stop() ...
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I am aware of the fact that the following code may seem vulgar, but I am new to these things and just tried everything in order to get it to work..
Problem: ... |
In my application which runs user submitted code[1] in separate threads, there might be some cases where the code might take very long to run or it might even have an ... |
Why is Thread.stop() so dangerous?
Why is it advisable to use Thread.interrupted() instead?
I know stop is deprecated. What other thing makes it unsafe?
Is there any place where I can use ... |
I want to stop the Java thread instantly. But it looks like the thread is taking time to stop the thread.
Is it good way to force the thread to stop. ... |
I am writing a simple game in java, and I have a following issue:
I have a controlling class, called MainGameFrame, in which there is initialized gameThread. MainGameFrame has a key listener ... |
I have the following structure for TCP client-server communication:
- On server startup server starts
acceptor thread, that accepts client
connections and passes ServerSocket
to it.
- When a client connection arrives,
acceptor thread ...
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in a java Runnable, I usually write a loop, like
while(running) {
......
}
Then set the running to false could make the thread stop.
But if the runnable is a long process ... |
I am writing a code for my homework, I am not so familiar with writing multi-threaded applications. I learned how to open a thread and start it. I better show the ... |
This code illustrates my problem:
//Constructor
public ReadFormat(String path, int nic) throws IOException{
this.path = path;
this.nic = String.valueOf(nic); ...
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I am trying to stop a thread. while stopping my thread i got thread interrupted exception.
What I can do if thread throw interrupted exception. should i catch it ... |
I start one thread to download contents from the internet, at one time, the thread is downloading one file, and then i want it stop and begin to download another file, ... |
i am using java tail-listener api to do monitor the log messages from the given input log file.Here my code is given below.
public static void main(String[] args) {
if (listOfFiles[i].isFile())
{
files ...
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In the below code, i have a while(true) loop.
considering a situation where there is some code in the try block where the thread is supposed to perform some tasks which takes ... |
What is the difference between stopping a java Thread and stopping an instance of Timer ?
Why is timer.cancel thread safe or is it ?
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Started several worker threads , need to notify them to stop. Since some of the threads will sleep for a while before next round of working, need a way which can ... |
In the following example how stop() method is implemented??
What should be done instead of using stop() method?
In my point of view ,When the desired state is suspended, the thread waits ... |
I've come again in one of THOSE situations where it is just impossible to stop/destroy/suspend a thread. .interrupt() doesn't do the trick and .stop() and .suspend() are deprecated.
Very simple example:
public class ...
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I am writing a program that does some batch processing. The batch elements can be processed independently of each other and we want to minimize overall processing time. So, ... |
My program running on a one thread. And I have another thread and I want to stop current thread and invoke the second thread. And after second thread stops I want ... |
I started a new thread to upload photos from the phone mobile to a computer webserver.
if (CMenu.retCommand == transferer)
{
thrdTrsfr = new Thread(this);
...
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This question is related to my previous one: Clip.stop() freeze for few seconds.
I found, that playing Clip in separated Thread may solve my problem with freezing application. So I've created ... |
How can I stop a thread running after it has been running for 5 seconds ?
I am unable to use java 5+ threading features (must work in j2me).
Possible solution - ... |
I've been trying to find out how can I run in a kind of executor service a few threads that won't leave the run() method while there is someone connected to ... |
I have a button "addCashier" which is creating a thread called "Cashier" now this thread is just simply generating orders every 4 seconds, a while(true) loop in the run() method of ... |
I have this code :
public void GenerateWtW() {
ExecutorService exec = Executors.newFixedThreadPool(30);
ConcurrentHashMap<String, Double> tf_idfCache = ...
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I have a Java book I'm learning from and in one of the examples, I saw something suspicious.
public class ThreadExample extends MIDlet {
boolean threadsRunning = true; // ...
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In my java application I have many threads, but there are several most important threads, which do complex calculations (accessing remote db's, etc).
In case all these important threads are died, then ... |
Hi Padmanabh, If you mean "end" the thread, then there is only one method that does this: stop()! The thread could stop() itself, or another thread could invoke this thread's stop() method. Finally, all threads will "stop" (end) on "exit"ing the application. Have a look at: http://java.sun.com/docs/books/jls/html/javalang.doc18.html#2658 Now, if you talk about changing a thread state from running to either waiting ... |
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Hi, I have a server that creates new thread per client. public void run() { while(true) { try { s = server.accept(); QueueWriterThread qwt = new QueueWriterThread(s,records); qwt.setDaemon(false); qwt.start(); }catch (IOException ioe) { System.err.println(dfltErrorMsg + " " + ioe.getMessage()); } } once I start new thread I do not keep reference to it. If server was stopped or killed by a ... |
Hi, I need some help regarding Thread.stop() method of java.lang.Thread Class. My Application uses Thread.stop() method for killing the Thread and this method is deprecated in JDK1.2.2 . I am looking for the alternate so same functionality. Scenario of Application: There are three classes 1.Class MyThread : This class extends java.lang.thread . In the run() method some URL Connection is opened ... |
I would appreciate if if someone could help me with this program. I have created a producer and consumer object as separate intities and have them communicating by one producing some text and the other consuming the text. I have read the items that I have been able to find in the saloon but thus far, they are of no help. ... |
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Once a run method is complete, the thread cannot be restarted, period. However, you can change the approach a bit to achieve the same effect. One (of many) ways is to have your run loop on a condition, wait on a shared monitor upon completion, and then use a notify to "restart" it - think work queue. I have some source ... |
wait() (within a synchronized code block of course) will cause the thread to stop until it is interrupted. start() (used with a Thread based object) will in effect branch a new thread off from the currently executing thread. Both threads will run (theoretically) in parallel. sleep() will make the currently running thread stop executing for a specified period of time, and ... |
I'm writing a miniature golf game using double buffering. When the "ball" travels over the "hole", I set the thread to null and print "Congratulations!" on the screen. I want to make it so the user can click on the screen and try again (restart the thread). In my mousePressed method I set the Thread runner = new Thread (this); and ... |
I am a programmer with enough java knowledge to ge t my face slapped. Although this is a thread problem, I'm not sure if I should post here or in the general group. I want to desgin a thread that the user can start/stop at a command prompt on a Sun box. The basic logic would be the user runs ./startup.sh ... |
hi i had a doubt. In java if i am spawning child thread(s) from a thread other than the main thread of the program, and i stop the parent thread, will the child thread also stop? or do I have to stop the child thread explicitly?(one way of doing this is by using join() method). In other words if i plan ... |
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Hi,all Suppose that you would like to stop a thread gracefully and release any locks that the thread might be holding. Which of the following three techniques is preferred over the other two? a. Invoke the Thread.stop method. b. Invoke the Thread.destroy method. c. Return from the run method based on the state of a boolean flag. C is prefer. Who ... |
Dear All, I know that Thread.stop() is depricated because of deadlick problems. And the alternate to this is givenm normally as public void run(){ while(isStop==false){ //do blah-blah } } public void stopThread(){ isStop=false; } But what i want is to stop the thread immidealty when i call the stop method. e.g my run is public void run(){ //do blah 1 //do ... |
If your class contains a member variable that is modified asynchronously by concurrently running threads, you can use Java's volatile keyword to notify the Java runtime system of this. At this time, the Java runtime system ignores the volatile marker. However, future releases of the Java runtime system will use this information to ensure that the variable is loaded from memory ... |
This is the recommended way to make a stoppable thread: class MyRunnable implements Runnable { private volatile boolean stop; public void stop() { stop = true; } public void run() { while (!stop) { // Do a little work } } } "Deadlock" is when one thread has locked object 1, and is waiting to lock object 2, while a second ... |
Hi everyone. I'm developing an application using JMX. Every managed object extends an abstract class that includes a method called start(). That method has to be called in order to start the managed object. I want to invoke that method using threads but that invocation could stop the thread for a long time. I have included a timeout for that method ... |
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hi all, I am working on webappliction , i started one thread in one jsp bean class, when i started i get the thread name and save it in database . The problem is ,when i wanted to stop that thread from some other page by getting this thread name from database.Because the thread is running and i wanted to stop ... |
Would the use of a thread be a way to run a piece of code seperately without causing an application to hang ? The problem I have is that this bit of code : SmtpClient client = new SmtpClient(SMTP_SERVER_IP); sometimes hangs causing the whole application to hang, if I could put it in a seperate method or thread that timesout then ... |
I am having a problem with a thread which I am trying to stop, but which hangs on the stop. I have included the code here below. Basically, I have a thread which does a read on a socket and just echos out whatever it read in. The client sends up an objet and then goes away. At which point the ... |
Hi Roger, Welcome to JavaRanch! There are a number of different ways to do this, but basically, you just want to write your run() methods so that they check some condition as they loop, and if the condition changes, they stop. Then you just change the condition to stop the Thread. An example public class MyThread extends Thread { private volatile ... |
Deprecated. This method was originally designed to destroy this thread without any cleanup. Any monitors it held would have remained locked. However, the method was never implemented. If if were to be implemented, it would be deadlock-prone in much the manner of suspend(). If the target thread held a lock protecting a critical system resource when it was destroyed, no thread ... |
Hello, I was working on a simple multithreaded chat program, and it was working fine until I decided to take heed to the deprecation errors associated with using Thread.stop(). I changed my code to Sun's reccomendations and used a boolean running, but a problem arises whenever I try to disconnect the client from the server Here's the problematic code: public void ... |
I'm only a basic Java programmer, trying to do something quite complex, so please forgive me. I've tried reading a textbook and some tutorials, but I can't get my head around this problem! Assuming I have 2 threads: Thread A - the 'main' thread, contains UI Thread B - which once started goes into a while loop reading a buffer. This ... |
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I have a class that extends Thread. The main method of this class just starts a thread which starts other threads. The number of threads varies based on a "properties" file. When all of the threads complete, I want the program to stop. I'm already calling join on the original thread started by main and interrupt on the other threads. It ... |
Hi, I have a situation. I want to stop a currently executing thread. Till java 1.3 it was stip() method which was killing the thread. But as of java 1.4 this method has been deprecated. Can u'll please help me to stop the thread without the stop() method. Any code snippets or some example will be fine. I have written one ... |
hi , i am continuosly reading mails from pop3 server. to read continuosly i am using a thread with infinite loop. while running in the tomcat it works fine . when i shut down the tomcat i am getting an error like "failed to shut down". this was caused due to the thread.this thread never dies off. can any one suggest ... |
If the thread includes a loop that is continually run, then the looping condition should include a check for a boolean, which can be set from outside the thread through some method. Then create a separate task that does nothing until the timeout limit has been reached, and which then calls that method. This can be done with the java.util.Timer/TimerTask classes; ... |
Hello Friends See i have 4 classes in a module,it is somewhat interlinked . in a particular class i need to end the particular thread(that class) without comming out of whole application and go to other class.. if i use System.exit(); i am ending the thread and as well as i ending whole application..... but i need only to that particular ... |
I'm calling the stop() method on a running thread. I'm not really bothered about recovery of the state of the task being performed on that thread. I'm getting a ThreadDeath error thrown. I've gone through the thread API documentation and it recommended not to catch the error. I'm following suit. My question is, is it safe from a JVM standpoint to ... |
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I am trying to stop a thread which listens for incoming socket data. // Listens for server console output as new thread public static class Listen implements Runnable { private volatile boolean stop; // Exit the Listen thread public void stop() { stop = true; } // Start the Listen thread public void run() { while(!stop) { try { System.out.println("Server Reply: ... |
Hello "andral"- On your way in you may have missed that we have a policy on screen names here at JavaRanch. Basically, it must consist of a first name, a space, and a last name, and not be obviously fictitious. Since yours does not conform with it, please take a moment to change it, which you can do right here. As ... |
Can any one tell me how can i stop the particular thread before completing its life time??? Just go through the following code. class TestThread{ public static void main(String[] args){ RunnableThread runnableThread = new RunnableThread (); Thread thread = new Thread(runnableThread ); thread.start(); } } 1. class RunnableThread implements Runnable{ 2. public void run(){ 3. for(int i = 0; i < ... |
Hi friends, My doubt is........ I have three threads which are going to access the method with different priorities. Is there any way that thread with the lowest priority will be execute first without the mercy of the cpu scheduler... by stopping the other threads to start executing the method..... Thanks kanthi kiran |
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Hi all, I recently modified a multithreaded application so that it can run concurrently on multiple machines(linux and/or solaris). It's pretty much a while loop that creates threads as long as a value in the prop file is true. I use a shell script to start the app. Currently to stop the app you have to alter the value in the ... |
How do you know that the thread keeps running even though the stopCrawling flag is set to false? To diagnose your problem we will need to see more code. Preferably make a complete, small, self contained version of the application that we could copy and compile ourselves and which shows your problem. Without context we can't really help. An example of ... |
Hi, I'd like to read lines of user input for one minute and then stop reading them and do other stuff. I don't want to use any deprecated methods, such as stop(), to implement this. Problem is, read(), readLine(), readUTF(), and other such methods block, so that even after a minute has expired, they still wait for one more line of ... |
I have Java code that requires the 'sleep' method to be added in two places. Otherwise the code fails because of an unavailable resource. I'm interested in whether the code might be modified so that one thread stops before another starts. In other words, the process which is running when the code 'sleeps' does so on one thread, and the process ... |
I would appreciate if if someone could help me with this program. I have created a producer and consumer object as separate intities and have them communicating by one producing some text and the other consuming the text. I have read the items that I have been able to find in the saloon but thus far, they are of no help. ... |
I need to stop a thread when I exit an application. I use myThread.stop(), but this is a deprecated method. Which is the correct way to terminate a thread? The need arises because I am caling an application from another. On exiting the called application, when control returns to the first one, the thread is still running. thanks, |
What wight cause the current thread to stop excutings? A.thread of higher priority become ready (yield-methode). B.method sleep() be called. C.method stop() be called D.method suspend() be called. E.method wait() be called I think the answers are A, B, C, D, E. Does a call to the wait method stop a thread? Thanks for your answers. Thomas. |
I have code in which the 'sleep' method appears in two places. I would like to replace both sleep's with code that starts a new thread when the thread from a prior task completes. As suggested on this forum, this was successfuly done with the first 'sleep' (line 6) by commenting it out and adding lines 3 and 4. This code ... |
I have Java code that requires the 'sleep method in two places or it otherwise fails to run to completion. However, the 'sleep' method significantly delays the run time. I'm therefore interested in replacing the 'sleep' method with code that will start and stop threads. In the code below, without the 'sleep' on line 5, line 7 fails to run, apparently ... |
HELLO! i am using an array i.e long timeArray[10]={11152,4583,3456,2345,86564}; these are the time pointers for which thread have to sleep one by one.. but the case in which i am facing problem is that while running for example thread is sleeping for 2nd element of array (4583 seconds) at that time user presses Next button now thread should leave 2nd element ... |
Hi all, I have 2 basic questions I'd like to drop here, in hope of a more Concurrency-senior member being able to help me out here. Have I understood the purpose of "Futures" correct in that it does indeed allow you to set intermediate results of a Thread in such Object, but that is this the responsibility of the developper? If ... |