[Advanced-java] class loaders and appservers and unloading apps

[Hanasaki JiJi]

We are thinking alike; however, does that mean that poorly implemented 
jsp/servlets/ejb's cannot be removed/shutdown?  the appserves seem to do 
a darn good job all the time.  The installed apps are treated more like 
a OS process.

Rob Helmer wrote:
> On Sun, Sep 21, 2003 at 02:44:53PM -0500, Hanasaki JiJi wrote:
> 
>>How is it that an appserver tomcat/bea/jboss.... can kill an app and 
>>unload it even if it has threads running to object instances that are 
>>inuse and not ready for garbage collection?
>>-- 
> 
> 
> 
> I believe it is because you run Servlets and EJBs inside App servers, which
> must follow a stricter API, and not actual Java applications (e.g. a 
> command line utility with just a "main" method).
> 
> Servlets must have an init() method, destroy() method and so on.
> 
> JSPs are basically Servlets when it comes down to it, and EJBs have
> a similar API wherein they are invoked and destroyed by the App server.
> 
> The App server also handles garbage collection for all running
> Servlets/EJBs; for instance, there is just one garbage collector per
> App server instance, rather than per-servlet/per-EJB.
> It also handles thread allocation.
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