something like this:
public class ASingletonImpl{
private static ASingletonImpl instance;
public synchronized AsingletonImpl getInstance(){
if (instance==null){
instance = new ASingletonImpl();
}
return instance;
}
///real code here
}
The problem is the cyclic dependence between the Class object, the
ASingletonImpl object and the according ClassLoader. This way nothing
can be freed by the gc.
regards
Leon
On 2/16/07, Jiang, Peiyun <[EMAIL PROTECTED]> wrote:
Just curious, can you elaborate on badly programmed singletons?
Thanks.
Peiyun
-----Original Message-----
From: Leon Rosenberg [mailto:[EMAIL PROTECTED]
Sent: February 16, 2007 11:08 AM
To: Tomcat Users List
Subject: Re: PermGen space
The typical problem here are badly programmed singletons. Do you have any?
regards
Leon
On 2/16/07, Davide Romanini <[EMAIL PROTECTED]> wrote:
> I'm too have this problem, it arises because for some reason the Tomcat
> WebAppClassloader cannot be garbage collected after undeploy. I made a
> lot of tests and didn't find any solution, also very simple and small
> webapps, when loaded/unloaded frequently, caused the problem... :-(
>
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