Re: Compile java sources inside J2EE component

From: Stefan Siegl (Stefan.Siegl_at_gmx.de)
Date: 09/07/04 

Date: Tue, 07 Sep 2004 12:01:39 +0200

Andrew Thompson wrote:

> On Tue, 07 Sep 2004 09:39:13 +0200, Stefan Siegl wrote:
>
>
>>After creating the source files I need
>>to compile them at runtime, is there a possibility to do so?
>
>
> Yes, but only by invoking classes for which
> Sun issues no public documentation, and
> reserves the right to change at any time.
>
>
>>As I said before if the model changes, the new source code files need to
>>be compiled again. Is there a way to "unload" possible classes that were
>>created for the last model, so that there won't be a clash with the
>>newly created classes?
>
>
> I am on unfamiliar ground here, but you
> might try using a custom class loader,
> and refreshing it.

I hope this is possible, I will give it a try, but I suspect that it
will not be that easy. I just thought that it must be possible to unload
the classes, because other Java application can do it too, i.e. the
JBoss app server with its hotdeploy feature.

> Better suggestions are probably forthcoming.
>
> But.. why does a CRM need to compile source
> 'on the fly', it seems like you might be
> approaching the problem wrong. (And again,
> I am not that experienced with the area,
> but it has a strong whiff of 'overkill'.)

The central requirement of the system is that the user should be allowed
to define his specific CRM model at runtime. Therefore a metamodel is
provided by me to define the general constructs a model can have (like a
class, associations, and so on). The model will then be represented by
instances of these metaclasses. based on this model the user is allowed
to insert/query/delete data.

The problem is that the handling of model is not easy if the model is
stored as meta instances, because then i do not have a nice connection
between the entered data and the model. That is why I wanted to have
java classes that represent this model and instances of this model to
represent the data. Using this approach I can directly check if the
rules of the models are kept within the offered data.

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