I would like to develop a desktop application with Java (I've got very basic knowledge of Java). It'll run on the client's computer and will pull information from the server hosted ... |
I'm a bit new to ant, but couldn't find an answer to this at all. What I need is that the java program takes a while to load in a bunch ... |
we use JCS very simply. Not distributed or anything, simply:
JCS jcs = JCS.getInstance("region-name");
I'm trying to register some kind of listener that can be used to receive a notification/event when an ... |
I have Naked notify warning of FindBugs.
The below is my code.
synchronized (this) {
this.notify();
}
The "this" is "public class Controller ... |
Our company recently purchased IBM's Tivoli Service Request Manager (aka TSRM) for managing our "catalog of IT services" (note, this does not necessarily mean web services, but what services do we ... |
I have developed an RMI application where the RMI server has to be started several times and also has to stop several times.
- How can I stop the RMI server without closing ...
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I've configured SSL(HTTPS) on all my 18 servers. All 18 servers communicates with each other using SSL. Everything was working fine. Suddenly I got this error "Received close_notify during handshake".
LOG ::@2011-06-03 ...
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I am using Java language
What I want is that Can any one help me to write a code that
When i click on delete option of any file or folder ... |
Is there any method similar to Notify() in vb.net, or how to implement the similar functionality in vb.net
Any help appreciated.
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I have implemented a generic test for the hashCode and equals methods using JUnit's experimental @Theory annotation. The test case class itself is based on dfa's version.
However, when I was ... |
Java -version (Sco Openserver 5)
Java(TM) 2 Runtime Environment, Standard Edition (build SCO-UNIX-J2SE-1.3.1_22:*
FCS*:20080305)
Classic VM (build SCO-UNIX-J2SE-1.3.1_22:*FCS*:20080305, green threads, sunwjit)
Problem :
OracleDataSource ods = OracleDatasource();
It occurs error :
The type javax.sql.DataSource cannot be resolved. It ... |
thank you rahul for ur reply,it is not working, i am putting my code here...please tell me the problem ------------ import java.awt.*; import java.awt.event.*; import java.applet.*; /**/ public class Count2 extends Applet implements ActionListener { int c=0; String out; Counter1 c1; Restart r1; public Label l1; Thread t; volatile boolean pauseflag=true; volatile boolean waitflag=false; Count22 c22=new Count22(); ... |
you can get detailed explanation in page 695 of Java How To Program by Deitel&Deitel. when a running thread calls wait the thread enter waiting state where it waits in a que associated with the particular object on which wait was called . The first thread in the wait queue for a particular object becomes ready on a call to notify ... |
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I want to have 1 thread waiting for a notify() call on an object. Does anyone know would happen to that thread if notify() was called a number of times? would the notify() calls be "queued" in some way so that instead of going back to sleep the thread would continually wake up for as many times as notify was called? ... |
Hi all!! Well though I looked around in the ranch for something clear on wait and notify 'twas futile.. so pardners.. can you show this dude how to throw the lasso over the wait and notify methods in threads? I need a simple illustration, with example if you got room, on how wait and notify can be used. Thanks everyone.. Regds ... |
17. notify coderanch.comnotify() can be called only by the thread which is current lock owner of this particular object. Since notify() is in Object class, every Java object has this method, but it can be called only from synchronized block of code, otherwise an exception will be thrown (I guess it is IllegalMonitorState exception with the message "Current Thread not owner"). So, in ... |
I'm probably over-thinking this, but am hoping someone can shed some light on how this works. The notify() method must be called from within a sync block (because the monitor for that object must be owned by the calling thread). I'm ok with how the wait/notify process works, but am confused on this point: if notify() is called from within a ... |
suppose when a synchonized method executes wait().that thtraed goes to the wait state, and leaves the monitor. suppose in the same way 3 threads are ter in the waiting state. now when another thread which has the monitor 1:gives notify() which thread in the wait set acqiires the monitor, 2:gives notifyAll()which thread in the wait set acqiires the monitor, wats the ... |
Originally posted by Edward Harned: Can you do that, NO. Will it work, NO. start() does more than execute the run() method. Wrong. It will work perfectly fine, it just won't have any useful effect because in that code at no point is any thread in the wait set of t. You seem to be making the same error the OP ... |
Basically the problem is that the last print statement "Code Block 4" does not print. This is because the main thread that calls notify() completes before the second thread (Thread-1) begins. As such when Thread-1 is called it permanently blocked as their is no active thread to call notify(). public class Play extends Thread{ private Object o; public Play(Object o) { ... |
Hello, I didn't get the output ...Can anybody explain me ?? I have bolden the problem in output. The code is from THE COMPLETE REFERENCE - HERBERT SCHILDT My second question is what happens when a notify() is encountered before a wait() statement as in the program below ?? class Q { int n; boolean valueSet=false; synchronized void put(int i) { ... |
I have not yet seen a good way to CLEANLY have a class send notifications about its progress. (For example, when using a JProgressBar) I find I have to litter the code with calls to "notify()" throughout its processing methods in order to update something like a progress bar. Is there a better way to do this? Some way for a ... |
Hi, We are working on an application Service provding project. If somebody requires our service,they will be registering their detail in our site page.As soon as they registers,their request will be updated to our database.By that time,in the server side, admin should be noticed by raising up window kind of things in the windows status bar ..(Examples MSN Messenger,YahooMesgr)How can I ... |
Hi, I am writing a code, In which I am having two 3 GB text files and merging them onto one 6 GB file. I am trying to implement the same via Multi threading. Here is my Code : import java.io.*; class ABCD { private String flagPriority = "W"; // W stand for write, R stand for Read private Object lock ... |
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HI Guys, I have a question: In the below code, we provide a simple function. When the user inputs "q" then exit from the application, otherwise wait for the user's input. My question is I find the wait, but where the application notify the wait? thanks in advance. import java.io.*; public class AppQuit { private static final String QUIT_STRING = new ... |
Hi All, I have a doubt related to the wait() and notify(). Please look at the following code: 1. class ThreadA { 2. public static void main(String [] args) { 3. ThreadB b = new ThreadB(); 4. b.start(); 5. 6. synchronized(b) { 7. try { 8. System.out.println("Waiting for b to complete..."); 9. b.wait(); 10. System.out.println("After waiting"); 11. } catch (InterruptedException e) ... |
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30. notify coderanch.comin the below code if i don't use notiy butresult don't change.why? if one thread wait other shouldn't be notify? package com.virtusa.samplethread.wait; public class waitEx { public static void main(String[] args) { ThreadA t=new ThreadA(); t.start(); synchronized(t){ System.out.println(" wait to calculate total "); try { t.wait(); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("Total is "+t.getTotal()); } } } class ThreadA ... |
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public void run() { while (true) { synchronized (jobs) { // wait until at least one job is available while (jobs.isEmpty()) { try { jobs.wait(); //ONE } catch (InterruptedException ie) { //TWO } //THREE } // If we get here, we know that jobs is not empty MachineInstructions instructions = jobs.remove(0); // Send machine steps to hardware } } } When ... |
As per my understanding of wait()/notify(), when notify() statement is executed, the lock is released back to the original object that put a wait() on it. So the original object should start executing (or atleast go back to runnable state ready to execute). But as per actual experience with the following code, notify() sems to have no effect. Only when the ... |
I think peoprl have already covered why the code doesn't work explaining its actual behaviour is quite complex but essentially you broke a very simple and well documented rule ... wait's should always be in loops that test a flag on wakeup to determine if the notify was intentional Read wait description here ... http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#wait%28long%29 and also most good books or ... |
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Indeed, wait and notify could do the trick, as well as locking functionality of java.util.concurrent package. And you could synchronize on any object you like - it only should be visible to both threads. For example:public class Test { // This is object to synchronize on. private static final Object waitObject = Test.class; // Your boolean. private static boolean boolValue = ... |
Make a program notify Hi. Basically, I want my program, if minimized or not the like...active window, to pop-up (I'm pretty sure that is not the technical term, but I don't know what it is). Whenever a new word/phrase changes or it tells you the answer I want it to notify the user somehow. Either by popping itself up ... |
Every object has a wait-set o threads. calling notify takes one thread out of the wait-set and puts it into the ready-set for that object. There's no guarantee that this most-recently liberated thread will be the one that will next grab the object lock. That's all in the vagaries of thread-scheduling. It could even be the thread that called notify that ... |
You have quite funky multithreading code there. The MemoryTableModel definitely doesn't need the Thread, since it's not doing anything else to it besides notifying. Your ProgramStarter class looks quite weird, it looks like it should be running in its own thread, yet it doesn't. What are both of those classes supposed to be doing? |
Define "doesn't work." If you call notify, then exactly one thread waiting on that object will be awakened (assuming there is at least one waiting thread). You cannot predict or control which thread--unless of course there is only one thread waiting on that object. If you call notifyAll, then all threads will be awakened. The awakened threads will get CPU cycles ... |
Basically, You shouldn't be trying to use wait/notify as these were fine for JDK 1.0- 1.4 but since JDK 5.0 (2004) the concurrency libraries are a better way to do these things. However, to answer your question. Your notify() notifies one thread, however then that thread wakes it calls notify() as well, (see your add() method) which wakes another thread, etc ... |
42. Notify forums.oracle.com |
marktheman wrote: Hi, I'm currently studying for the SCJP exam and have 2 questions about the thread notify call. (1) Is it possible when a thread owns an object lock, i.e. say in synchronized code, that it can call the notify method on a particular thread. For example, say there are 2 threads, names thread1 and thread2, and thead1 obtains object ... |
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Hi, I was wondering if its possible in any way to use the garbage collector to recycle objects directly without freeing them first. Essentially i would like to hold a special reference to some particular objects, and be notified when this reference is the only thing keeping the object alive (in which case i could recycle it) or be given a ... |
hi, i'm planning to make a small app wich gives notifications (on desktop) when changes are made on a http server; simular like an email notifier. the server (university server) i want to listen needs authorisation and is ssl secured. once logged in you can watch new post from profs and/or studens, new files uploaded,... basically i want an app that ... |
Hello, I start 10 Threads. If a thread must wait till recourse are valid then I call wait() method. If any recourse are valid another synchronized method calls notify() method to wake up the thread. I have the problem, that some the treads are in wait status and these will never wake up again! This happens exactly, when I choose for ... |
One way to think of the wait/notify protocol is to imagine an item of data such as an integer variable as if it were a field in a database. If you do not have some locking mechanism in the database you stand a chance of corruption to the data. Thus one user might retrieve the data and perform a calculation and ... |
I have a program that reads from a database some criteria (when to run a particular task - hourly, daily, monthly). However, if the database gets updated and the time period changes or other items in database change I want my class to be notified of those changes. How can I something like this? |
I have a producer/consumer scenario with one producer and multiple consumer. When the producer adds a message to the queue it notifies the consumer waiting for messages. If there are no consumer waiting for messages, is the notify ignored? Will calling notify() when no consumers are waiting cause problem. I don't know how to really check it, but as long as ... |