Google App Engine + Siena leads to a SienaException

[Nicolas GIRARDIN]

Hi Players!

I'm stuck from hours on a strange exception, maybe one of you could help?  I'm using the Google App Engine and Siena modules to store simple "City" objects and retrieve them.

My models/City.java looks like this:

package models;

import siena.Generator;

import siena.Id;

import siena.Model;

import siena.Query;

public class City extends Model {

@Id(Generator.AUTO_INCREMENT)

public Long id;

public String name;

public String code;

public City(String name, String code) {

this.name = name;

this.code = code;

}

public static Query<City> all() {

return Model.all(City.class);

}

}

My controller is as simple as the model:

package controllers;

import models.City;

import play.mvc.Controller;

public class Application extends Controller {

public static void index() {

City strasbourg = new City("Strasbourg", "SXB");

City dubai = new City("Dubai", "DXB");

strasbourg.insert();

dubai.insert();

renderJSON(City.all().fetch());

}

}

Launching "play run" and going to "http://localhost:9000/", leads to the given error:

Internal Server Error (500) for request GET /

Execution exception (In /app/controllers/Application.java around line 16)

SienaException occured : java.lang.IllegalAccessException: Class siena.gae.GaePersistenceManager can not access a member of class models.City with modifiers "private"

play.exceptions.JavaExecutionException: java.lang.IllegalAccessException: Class siena.gae.GaePersistenceManager can not access a member of class models.City with modifiers "private"

at play.mvc.ActionInvoker.invoke(ActionInvoker.java:225)

at Invocation.HTTP Request(Play!)

Caused by: siena.SienaException: java.lang.IllegalAccessException: Class siena.gae.GaePersistenceManager can not access a member of class models.City with modifiers "private"

at siena.gae.GaePersistenceManager.mapEntities(GaePersistenceManager.java:220)

at siena.gae.GaeQuery.map(GaeQuery.java:79)

at siena.gae.GaeQuery.fetch(GaeQuery.java:85)

at controllers.Application.index(Application.java:16)

at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:432)

at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:427)

at play.mvc.ActionInvoker.invoke(ActionInvoker.java:155)

... 1 more

Caused by: java.lang.IllegalAccessException: Class siena.gae.GaePersistenceManager can not access a member of class models.City with modifiers "private"

at java.lang.Class.newInstance0(Class.java:349)

at java.lang.Class.newInstance(Class.java:308)

at siena.gae.GaePersistenceManager.mapEntities(GaePersistenceManager.java:213)

... 7 more

Replacing "renderJSON(City.all().fetch());" by "renderJSON(City.all().count());" works as exepected and no exception is thrown...

Any idea? :)

Nicolas GIRARDIN

[Pascal Voitot Dev]

you are the second one to report this kind of problem that never appeared before...

What version of Play do you use?
Is it a recent one?

Pascal

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[Pascal Voitot Dev]

if you could give me a small project example so that I can reproduce the problem, it would be great!

Pascal

[David González]

> can not access a member of class models.City with modifiers "private"

I think the fields are supposed to be public if I'm not mistaken.. try it out 

--
Best wishes,

David

[David González]

Opps, they are public.... ignore my previous comment then !

--
Best wishes,

David

[Pascal Voitot Dev]

I think something has changed in play because I use siena quite often with Play and doesn't have any problem.
But I'm still using Play 1.1... not a very recent version!
anyway as I'm trying to finalize Siena 1.0, it's the right time to correct such things ;)

[Nicolas Girardin]

Hi all,

David, I found this error on a bigger project, so I started a new one,
to be sure that no private fields appears anywhere.

Pascal, I'm using play-1.2-preview, downloaded from the
http://download.playframework.org/releases/ page. I can't find any
github 1.2 repo, to test with an much up-to-date version.
I added Siena in the dependencies.yaml and used "play dependencies".
Are you a Siena commiter?

I won't try to join my project to this message as it weight 14 MB, but
you can download it from http://dl.free.fr/lVoqWbkWY (let me know if
you're experiencing very slow downloads). It's eclipsified so an
import should do the job.

Thanks for taking time to inverstigate my issue! :)

Nicolas

2011/3/13 Pascal Voitot Dev <pascal.v...@gmail.com>:

[Pascal Voitot Dev]

Thank you!
I'm going to investigate this problem tomorrow if I can!
apparently something has changed somewhere in Play! and the class siena.Model becomes a problem...

Thank for your patience, I hope to find the problem quickly!

pascal

[Pascal Voitot Dev]

On Sun, Mar 13, 2011 at 11:57 PM, Nicolas Girardin <ngir...@gmail.com> wrote:

Hi all,

David, I found this error on a bigger project, so I started a new one,
to be sure that no private fields appears anywhere.

Pascal, I'm using play-1.2-preview, downloaded from the
http://download.playframework.org/releases/ page. I can't find any
github 1.2 repo, to test with an much up-to-date version.
I added Siena in the dependencies.yaml and used "play dependencies".
Are you a Siena commiter?

yes I am a siena committer
 

[Pascal Voitot Dev]

please see my last mail, it explains the reason of this exception and gives a workaround

[niiamon]

What mail would that be Pascal? I saw this Exception sporadically
appear for a different model this morning :)

On Mar 14, 8:13 am, Pascal Voitot Dev <pascal.voitot....@gmail.com>
wrote:

> please see my last mail, it explains the reason of this exception and gives
> a workaround
>
> On Mon, Mar 14, 2011 at 12:45 AM, Pascal Voitot Dev <
>
>
>
>
>
>
>

> pascal.voitot....@gmail.com> wrote:

>
> > On Sun, Mar 13, 2011 at 11:57 PM, Nicolas Girardin <ngirar...@gmail.com>wrote:
>
> >> Hi all,
>
> >> David, I found this error on a bigger project, so I started a new one,
> >> to be sure that no private fields appears anywhere.
>
> >> Pascal, I'm using play-1.2-preview, downloaded from the

> >>http://download.playframework.org/releases/page. I can't find any

> >> github 1.2 repo, to test with an much up-to-date version.
> >> I added Siena in the dependencies.yaml and used "play dependencies".
> >> Are you a Siena commiter?
>
> > yes I am a siena committer
>
> >> I won't try to join my project to this message as it weight 14 MB, but

> >> you can download it fromhttp://dl.free.fr/lVoqWbkWY(let me know if

> >> you're experiencing very slow downloads). It's eclipsified so an
> >> import should do the job.
>
> >> Thanks for taking time to inverstigate my issue! :)
>
> >> Nicolas
>

> >> 2011/3/13 Pascal Voitot Dev <pascal.voitot....@gmail.com>:

> >> > I think something has changed in play because I use siena quite often
> >> with
> >> > Play and doesn't have any problem.
> >> > But I'm still using Play 1.1... not a very recent version!
> >> > anyway as I'm trying to finalize Siena 1.0, it's the right time to
> >> correct
> >> > such things ;)
>

> >> > On Sun, Mar 13, 2011 at 8:31 PM, David González <allen...@gmail.com>

> >> wrote:
>
> >> >> Opps, they are public.... ignore my previous comment then !
>

> >> >> On Sun, Mar 13, 2011 at 3:29 PM, David González <allen...@gmail.com>

[Pascal Voitot Dev]

a mail with this title:"[play-framework] GAE + Siena leads to IllegalArg on private fields : workaround + explanation + Play interrogation on the private default constructor created behind the scene"

the temporary workaround is : create a default constructor in your model

Pascal

[Nicolas Girardin]

Thank you very much Pascal for your help!

I've created a public empty constructor and it works like a charm!

Will you provide a patch for this issue?

Nicolas

2011/3/14 Pascal Voitot Dev <pascal.v...@gmail.com>:

[Pascal Voitot Dev]

On Mon, Mar 14, 2011 at 9:43 PM, Nicolas Girardin <ngir...@gmail.com> wrote:

Thank you very much Pascal for your help!

I've created a public empty constructor and it works like a charm!

Will you provide a patch for this issue?

it depends on comments by people from play about this private default constructor... I'm still weighing the possible drawbacks...
anyway the code of 0.7.6 is a bit old now and as I'm trying to finish Siena v1.0 which refactors and enhances lots of things, I don't know if I will patch old version or wait for the new one...
need some more reflexion ;)

 

[Nicolas Girardin]

Thanks you very much, it works like a charm!