thread problem

[satish]

Hi I am having problems with this bit of code....

the wait method is hanging the system..if if say
syncObj.wait(2000)
then it works..but there doesnrt seem to be any communication between
noify() and wait() methods. I am not able to work out about the problem...pls
do help...

Regards

Satish

private boolean upgradeComplete= false;
private Object syncObj = new Object();

if (response == JOptionPane.YES_OPTION)
{
depotVersion = JOptionPane.showInputDialog(parent,
"Please enter the depotVersion:" /*13A*/);
txtDisplay.append("Performing the OAM Upgrade " +
'\n');
// get ats connection, prepare data and send it

txtOAMVersion.setText(" ");

// pls check the code from here...................................

callInvokeOAMUpgrade();

// this mathod takes a few secs to execute and I want the callCurrentVersion
to wait for this to complete...


synchronized(syncObj)
{

while(upgradeComplete = false);
{
System.out.println(upgradeComplete);
try
{
syncObj.wait(); // I waant this to wait..
}
catch (Exception e){ }
}
if(upgradeComplete = true)
{
System.out.println(upgradeComplete);
syncObj.notify(); //after completion it notifys
callCurrentVersion();
}
}
}
else if (response == JOptionPane.NO_OPTION)
{
txtDisplay.append(" OAM Upgrade cancelled" + '\n');
}
btnOAMRollback.setEnabled(true);
btnOAMUpgrade.setEnabled(true);
}

[Randy Charles Morin]

From what I can tell, you are synchronizing on the object and waiting on it.
The notify call is also synchronized on the same object as the wait. This
means that notify will never be called while you are waiting. That is, calls
to wait and calls to notify are synchronized (only one can be called at any
time).

You best solution is to read a bit about synchronization objects in Java.
--
Randy Charles Morin
Author of Programming Windows Services
http://www.kbcafe.com

Feel free to contact me by private email or messenger
MSN Messenger - morin_randy@hotmail.com
Yahoo Messenger - randymorin@yahoo.com

"satish" <satish_141@yahoo.com> wrote in message
news:3c064151$1@147.208.176.211...
>
> Hi I am having problems with this bit of code....
>
> the wait method is hanging the system..if if say
> syncObj.wait(2000)
> then it works..but there doesnrt seem to be any communication between
> noify() and wait() methods. I am not able to work out about the
problem...pls
> do help...
>
> Regards
>
> Satish
>
> private boolean upgradeComplete= false;
> private Object syncObj = new Object();
>
> if (response == JOptionPane.YES_OPTION)
> {
> depotVersion = JOptionPane.showInputDialog(parent,
> "Please enter the depotVersion:" /*13A*/);
> txtDisplay.append("Performing the OAM Upgrade " +
> '\n');
> // get ats connection, prepare data and send it
>
> txtOAMVersion.setText(" ");
>
> // pls check the code from here...................................
>
> callInvokeOAMUpgrade();
>
> // this mathod takes a few secs to execute and I want the
callCurrentVersion
> to wait for this to complete...
>
>
> synchronized(syncObj)
> {
>
> while(upgradeComplete = false);
> {
> System.out.println(upgradeComplete);
> try
> {
> syncObj.wait(); // I waant this to wait..
> }
> catch (Exception e){ }
> }
> if(upgradeComplete = true)
> {
> System.out.println(upgradeComplete);
> syncObj.notify(); //after completion it
notifys
> callCurrentVersion();
> }
> }
> }
> else if (response == JOptionPane.NO_OPTION)
> {
> txtDisplay.append(" OAM Upgrade cancelled" +
'\n');
> }
> btnOAMRollback.setEnabled(true);
> btnOAMUpgrade.setEnabled(true);
> }
>