Help with Thread Sleep Calls causing lack of SLEEP  
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Author Message
Andrew Booth
PostPosted: 2003-11-18 21:15:00 Top
java-programmer, Help with Thread Sleep Calls causing lack of SLEEP Hello

I am trying to introduce the sleep() command into my java code.

The existing program runs without the sleep command but I have
indeterminancy
I therefore want to send my threads to sleep for different lengths of time.

I have used the following

public void run()
{
for (index1 = START; index1<END; index1++)
{
try
{
sleep(3000);
}
catch(InterruptedException e){}
buf.insert(Pots[index1]);
}
}


My problem is that I can get it to compile ok but when I execute it throws a
whole host of errors.

Can anyone help?

What am I doing wrong?


The only outcome of my current sleep() call is lack of sleep on my part


TIA


Andrew


 
Jonas Kongslund
PostPosted: 2003-11-18 22:25:00 Top
java-programmer >> Help with Thread Sleep Calls causing lack of SLEEP Andrew Booth wrote:

> Hello
>
> I am trying to introduce the sleep() command into my java code.
>
> The existing program runs without the sleep command but I have
> indeterminancy
> I therefore want to send my threads to sleep for different lengths of
> time.

Are you playing around with threads and monitors? Then you probably want to
use wait instead of sleep.

> My problem is that I can get it to compile ok but when I execute it throws
> a whole host of errors.

Which errors?

Please be more specific about what program you are trying to make, i.e. what
is its specification, and what you have created so far, i.e. what is the
current implementation.

--
Jonas Kongslund
 
Alex Hunsley
PostPosted: 2003-11-19 0:21:00 Top
java-programmer >> Help with Thread Sleep Calls causing lack of SLEEP Andrew Booth wrote:
> Hello
>
> I am trying to introduce the sleep() command into my java code.
>
> The existing program runs without the sleep command but I have
> indeterminancy
> I therefore want to send my threads to sleep for different lengths of time.
>
> I have used the following
>
> public void run()
> {
> for (index1 = START; index1<END; index1++)
> {
> try
> {
> sleep(3000);
> }
> catch(InterruptedException e){}
> buf.insert(Pots[index1]);
> }
> }
>
>
> My problem is that I can get it to compile ok but when I execute it throws a
> whole host of errors.
>
> Can anyone help?
>
> What am I doing wrong?

Are you sure you don't mean Thread.currentThread().sleep(3000)?

Anyway, it sounds like you're using sleep for an evil purpose - i.e.
waiting a random set amount of time for something else to finish - you
should probably be using monitors or locking or something similar in
this case.

alex

 
 
Andrew Booth
PostPosted: 2003-11-19 1:35:00 Top
java-programmer >> Help with Thread Sleep Calls causing lack of SLEEP The program is for a university assignment that gives an example of the
producer - consumer problem

basically I have 2 producers and 1 consumer

I want to send producer 1 to sleep for 1 second and prooducer 2 for 2
seconds (looping each 10 times)
the consumer I want to operate at a rate of 1 every 3 secs hence sending
this thread to sleep for 3 seconds. (looping 20 times)

The program is enclosed in a single class file.

I am extending the thread class for each thread so I don't need the
Thread.sleep() command just the sleep()

The errors it throws up are as follows:


java.lang.NoClassDefFoundError: Potters2 (wrong name: Comp224/Potters2)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
Exception in thread "main" 


hope this makes it clearer to some one??


Regards

Andrew


"Jonas Kongslund" <email***@***.com> wrote in message
news:HYpub.6208$email***@***.com...
> Andrew Booth wrote:
>
> > Hello
> >
> > I am trying to introduce the sleep() command into my java code.
> >
> > The existing program runs without the sleep command but I have
> > indeterminancy
> > I therefore want to send my threads to sleep for different lengths of
> > time.
>
> Are you playing around with threads and monitors? Then you probably want
to
> use wait instead of sleep.
>
> > My problem is that I can get it to compile ok but when I execute it
throws
> > a whole host of errors.
>
> Which errors?
>
> Please be more specific about what program you are trying to make, i.e.
what
> is its specification, and what you have created so far, i.e. what is the
> current implementation.
>
> --
> Jonas Kongslund


 
 
Andrew Booth
PostPosted: 2003-11-19 1:35:00 Top
java-programmer >> Help with Thread Sleep Calls causing lack of SLEEP The program is for a university assignment that gives an example of the
producer - consumer problem

basically I have 2 producers and 1 consumer

I want to send producer 1 to sleep for 1 second and prooducer 2 for 2
seconds (looping each 10 times)
the consumer I want to operate at a rate of 1 every 3 secs hence sending
this thread to sleep for 3 seconds. (looping 20 times)

The program is enclosed in a single class file.

I am extending the thread class for each thread so I don't need the
Thread.sleep() command just the sleep()

The errors it throws up are as follows:


java.lang.NoClassDefFoundError: Potters2 (wrong name: Comp224/Potters2)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
Exception in thread "main" 


hope this makes it clearer to some one??


Regards

Andrew


"Jonas Kongslund" <email***@***.com> wrote in message
news:HYpub.6208$email***@***.com...
> Andrew Booth wrote:
>
> > Hello
> >
> > I am trying to introduce the sleep() command into my java code.
> >
> > The existing program runs without the sleep command but I have
> > indeterminancy
> > I therefore want to send my threads to sleep for different lengths of
> > time.
>
> Are you playing around with threads and monitors? Then you probably want
to
> use wait instead of sleep.
>
> > My problem is that I can get it to compile ok but when I execute it
throws
> > a whole host of errors.
>
> Which errors?
>
> Please be more specific about what program you are trying to make, i.e.
what
> is its specification, and what you have created so far, i.e. what is the
> current implementation.
>
> --
> Jonas Kongslund


 
 
Andrew Booth
PostPosted: 2003-11-19 1:39:00 Top
java-programmer >> Help with Thread Sleep Calls causing lack of SLEEP The program is for a university assignment that gives an example of the
producer - consumer problem

basically I have 2 producers and 1 consumer

I want to send producer 1 to sleep for 1 second and prooducer 2 for 2
seconds (looping each 10 times)
the consumer I want to operate at a rate of 1 every 3 secs hence sending
this thread to sleep for 3 seconds. (looping 20 times)

The program is enclosed in a single class file.

I am extending the thread class for each thread so I don't need the
Thread.sleep() command just the sleep()

The errors it throws up are as follows:


java.lang.NoClassDefFoundError: Potters2 (wrong name: Comp224/Potters2)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
Exception in thread "main" 


hope this makes it clearer to some one??


Regards

Andrew


"Jonas Kongslund" <email***@***.com> wrote in message
news:HYpub.6208$email***@***.com...
> Andrew Booth wrote:
>
> > Hello
> >
> > I am trying to introduce the sleep() command into my java code.
> >
> > The existing program runs without the sleep command but I have
> > indeterminancy
> > I therefore want to send my threads to sleep for different lengths of
> > time.
>
> Are you playing around with threads and monitors? Then you probably want
to
> use wait instead of sleep.
>
> > My problem is that I can get it to compile ok but when I execute it
throws
> > a whole host of errors.
>
> Which errors?
>
> Please be more specific about what program you are trying to make, i.e.
what
> is its specification, and what you have created so far, i.e. what is the
> current implementation.
>
> --
> Jonas Kongslund



 
 
Jonas Kongslund
PostPosted: 2003-11-19 2:27:00 Top
java-programmer >> Help with Thread Sleep Calls causing lack of SLEEP Andrew Booth wrote:
[snip]
> The errors it throws up are as follows:
>
> java.lang.NoClassDefFoundError: Potters2 (wrong name: Comp224/Potters2)
> at java.lang.ClassLoader.defineClass0(Native Method)
> at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
> at
[snip]

I suggest that you check your classpath. The error above has nothing to do
with you invoking the sleep method on a thread.

--
Jonas Kongslund
 
 
Jon Skeet
PostPosted: 2003-11-19 21:08:00 Top
java-programmer >> Help with Thread Sleep Calls causing lack of SLEEP Alex Hunsley <email***@***.com> wrote:
> Are you sure you don't mean Thread.currentThread().sleep(3000)?

He certainly doesn't. sleep() is a static method. It's unfortunate that
Java allows static members to be accessed via references, but the above
does nothing different from Thread.sleep() - the current thread is
*always* the one which is set to sleep.

> Anyway, it sounds like you're using sleep for an evil purpose - i.e.
> waiting a random set amount of time for something else to finish - you
> should probably be using monitors or locking or something similar in
> this case.

Agreed.

--
Jon Skeet - <email***@***.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
 
 
 
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