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From Hugi Thordarson <>
Subject Re: Dynamically reloading the model on change
Date Mon, 30 May 2016 12:51:03 GMT
In my case it’s a singleton, created by me and lazily initialized—so I should only need
to set that variable to null on a model change event. Experimenting with this now.

- hugi

> On 30. maí 2016, at 12:48, Andrus Adamchik <> wrote:
> In a typical app ServerRuntime is a singleton controlled by your code. You are probably
creating it explicitly in your app somewhere on startup. Or are you relying on CayenneFilter
to bootstrap Cayenne? (in which case runtime is accessible via WebUtil.getCayenneRuntime(..)).
> Andrus
>> On May 30, 2016, at 3:44 PM, Hugi Thordarson <> wrote:
>> I currently use JRebel for class reloading when developing WO. It has a relatively
simple plugin API that can be used to watch changes to Cayenne project files and trigger stuff
on file/class modification. It could replace the ServerRuntime instance, but it would need
some way to know what ServerRuntime instances to replace with a new instance. This could be
specified in a configuration file—or is there some way for me to retrieve all ServerRuntime
instances related to the modified entities?
>> - hugi
>>> On 30. maí 2016, at 12:31, Andrus Adamchik <> wrote:
>>> Doable in theory - just create a new runtime every time you detect a change.
The bigger question is how practical this is, considering you also need to reload Java classes.
I guess also doable if you run in debug mode that does class reloading.
>>> Andrus
>>>> On May 30, 2016, at 3:27 PM, Hugi Thordarson <> wrote:
>>>> Hi all,
>>>> I’ve been working with Ebean for the past couple of months (customer unfortunately
mandated the use of Ebean). I don’t really like working with it, but it has one feature
that I really like—I can change model classes at will (add attributes, relationships etc.)
and the changes take effect immediately, i.e. I don’t need to restart the application.
>>>> Is it possible to do something similes in Cayenne? I.e., can I make changes
to the model and then reload the runtime, or something of the ilk?
>>>> Cheers,
>>>> - hugi

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