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Re: How to programatically limit the number of threads in a java

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On 12.05.15 17.49, Ajay Paul wrote:
> How to programatically limit the number of threads in a java.

Simply do not start more threads than wanted. :-)
Java will not start more than one thread automatically.

> I know the settings in different application servers such as websphere to do that,

Exactly. The number of threads need to be controlled by the application 
that starts them. Web application servers are this kind of application.

 > but how do we do it programatically.

Not at all.

Even if the JVM could control that what should be the action when the 
application requests another thread?
Throw a NoMoreThreadsException? This exception could not be reasonably 
handled by the application. I.e. it will cause unexpected aborts or 
other malfunction. The effect is comparable to out of memory exceptions, 
since some libraries rely on the availability of (a limited number of) 
threads, e.g. JMS or DBMS drivers. So basically you will need to restart 
the application server after that exception.
Wait until another thread terminates? This is called a thread pool. 
However, the application could deadlock, because the expected task may 
not complete in a reasonable time, e.g. especially when other threads 
wait for this one. Thread pools are commonly used by applications 
servers but they must handle only independent requests.


Marcel

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Thread

How to programatically limit the number of threads in a java Ajay Paul <ajaykpaul@gmail.com> - 2015-05-12 08:49 -0700
  Re: How to programatically limit the number of threads in a java Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-05-12 12:01 -0400
  Re: How to programatically limit the number of threads in a java Marcel Mueller <news.5.maazl@spamgourmet.org> - 2015-05-12 21:19 +0200
    Re: How to programatically limit the number of threads in a java Joerg Meier <joergmmeier@arcor.de> - 2015-05-13 09:48 +0200
      Re: How to programatically limit the number of threads in a java Arne Vajhøj <arne@vajhoej.dk> - 2015-06-03 21:51 -0400
        Re: How to programatically limit the number of threads in a java dolnotmail@nomail.com (e) - 2015-06-15 03:33 +0000
          Re: How to programatically limit the number of threads in a java Robert Klemme <shortcutter@googlemail.com> - 2015-06-15 08:23 +0200
    Re: How to programatically limit the number of threads in a java Arne Vajhøj <arne@vajhoej.dk> - 2015-06-03 21:50 -0400

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