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From "Jack Cai" <greensi...@gmail.com>
Subject Re: Geronimo Cannot Auto-reload class File
Date Thu, 15 Jan 2009 14:31:42 GMT
Actually Tomcat does do a reload for the whole Web app when it detects a
class update. There's no big magic here. The "reloadable" attribute is only
recommended for use during app development, not for production. The feature
just saves a click of "restart".

-Jack

2009/1/15 David Jencks <david_jencks@yahoo.com>

> I really doubt that pursuing this will turn out to be a good use of our
> time -- I fear that it is likely to introduce hard-to-find and fix problems
> -- but if anyone wants to look into it....
>
> -- a tomcat flag is unlikely to work in geronimo since we are not using any
> tomcat class loaders.
>
> -- I would investigate what tomcat does from this flag and if eclipse has a
> similar feature and find out how they work.
>
> -- I think I recall a jvm feature that lets you replace class definitions
> in some circumstances.  I've never used it and don't know when it can be
> used.
>
> Basically I don't see how you can reliably replace one class - say a
> servlet class - in a web app without restarting the whole web app.  There is
> going to be at least one instance of the servlet class created, so you need
> to stop and recreate the servlet.  Assuming it has load-on-startup == 0.....
> you have to start the whole web app.
>
> If people have different perspectives I'd like to hear them :-)
>
> From a user perspective what I do is to set up a maven build that builds my
> app, uses the car-maven-plugin to build it into a geronimo plugin, use the
> car-maven-plugin again to build a micro server including my app, and use
> selenium to run tests against it in the micro server.
>
> thanks
> david jencks
>
> On Jan 15, 2009, at 12:12 AM, Jack Cai wrote:
>
> I also agree that it's nice to have that. But I guess it's not as easy as
> just exposing the attribute. As David J. pointed out in another thread, we
> are dealing with two containers here. I did a small experiment by adding a
> context.xml in Tomcat's conf folder, and set "reloadable=true". Then Tomcat
> reports a NullPointerException each time it wants to do class reload. We
> need to look deeper into this.
>
> -Jack
>
> 2009/1/15 Ivan <xhhsld@gmail.com>
>
>> Currently, it seems that the reload attribute of the context is not
>> exported by the TomcatWebAppContext GBean, shall we add this attribute to
>> allow the user to set it in the config.xml ?Thanks !
>>
>> 2009/1/15 chi runhua <chirunhua@gmail.com>
>>
>> Try deploy --inPlace <yourAppHome>,    here is the doc for your
>>> information
>>>
>>> http://cwiki.apache.org/GMOxDOC22/deploy.html#deploy-Deploy
>>>
>>> Jeff C
>>>
>>>
>>> On Thu, Jan 15, 2009 at 2:36 PM, Kai Fei <boyate@gmail.com> wrote:
>>>
>>>> Hello,
>>>>
>>>> My name is Kai, a new geronimo user. I met a small problem when develope
>>>> a web application on geronimo. It seems that geronimo won't reload the java
>>>> class file when it is replaced.
>>>> Here is what I did:
>>>> After I deploied a war file, I wanted to change a java class, so I
>>>> replaced the old one with a new one, but the application didn't make any
>>>> changes. Then I restart the war application, it works.
>>>> Is there any way to make geronimo reload the java class file
>>>> automaticly?
>>>>
>>>> I expect that there could be a config file which can enable this
>>>> function, but I didn't find...
>>>>
>>>> Would anyone help?
>>>>
>>>
>>>
>>
>>
>> --
>> Ivan
>>
>
>
>

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