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EMF attribute cannot be set [message #24215]

Sun, 20 August 2006 11:11

Eclipse User

Originally posted by: George.Z.Lei.gmail.com

Hi all,

When I set the attribute value of the EMF model from my edit parts, an
exception was always catched internally. The exception is as following

java.lang.IllegalStateException: Cannot modify resource set without a write
transaction

It happened when the model finished setting value for attribute and was
firing a notification. During the process, a transaction object was
retrieved and validated, and the transaction is readonly, therefore the
exception was thrown.

Who can help me to analyze the cause for the exception?

Thanks,
George

Re: EMF attribute cannot be set [message #25057 is a reply to message #24215]

Mon, 21 August 2006 16:42

Eclipse User

George Lei wrote:
> Hi all,
>
> When I set the attribute value of the EMF model from my edit parts, an
> exception was always catched internally. The exception is as following
>
> java.lang.IllegalStateException: Cannot modify resource set without a write
> transaction
>
> It happened when the model finished setting value for attribute and was
> firing a notification. During the process, a transaction object was
> retrieved and validated, and the transaction is readonly, therefore the
> exception was thrown.
>
> Who can help me to analyze the cause for the exception?
>
>
> Thanks,
> George
>
>
You have to open a write transaction before doing any model changes
You will need to check who was trying to change the attribute without
having a write transaction

Re: EMF attribute cannot be set [message #30978 is a reply to message #25057]

Sat, 26 August 2006 12:33

Eclipse User

Originally posted by: George.Z.Lei.gmail.com

"Mohammed Mostafa" <mmostafa@ca.ibm.com> wrote in message
news:ecd5sj$lsn$1@utils.eclipse.org...
> George Lei wrote:
> > Hi all,
> >
> > When I set the attribute value of the EMF model from my edit parts, an
> > exception was always catched internally. The exception is as following
> >
> > java.lang.IllegalStateException: Cannot modify resource set without a
write
> > transaction
> >
> > It happened when the model finished setting value for attribute and was
> > firing a notification. During the process, a transaction object was
> > retrieved and validated, and the transaction is readonly, therefore the
> > exception was thrown.
> >
> > Who can help me to analyze the cause for the exception?
> >
> >
> > Thanks,
> > George
> >
> >
> You have to open a write transaction before doing any model changes
> You will need to check who was trying to change the attribute without
> having a write transaction

In fact I am trying to set some model attribute in the constructor of edit
part. Maybe it is not a good idea.
Is there any better solution to set the attributes when the edit part is
created?

Thanks,
George

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