[ http://issues.apache.org/jira/browse/TAPESTRY-1111?page=all ]
Jesse Kuhnert updated TAPESTRY-1111:
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Fix Version/s: 4.1.2
> Throw an exception when trying to access an uninitialized property
> ------------------------------------------------------------------
>
> Key: TAPESTRY-1111
> URL: http://issues.apache.org/jira/browse/TAPESTRY-1111
> Project: Tapestry
> Issue Type: Improvement
> Components: Core
> Affects Versions: 4.0
> Reporter: Peter Eastman
> Assigned To: Jesse Kuhnert
> Fix For: 4.1.2
>
>
> If you do not specify a default value for a property (e.g. with
> @InitialValue), it gets initialized to a default value selected by Tapestry.
> This creates lots of opportunities for confusion and bugs. I suggest that
> instead, the property should be marked internally as "uninitialized". If you
> attempt to get its value while it is in that state, it should throw an
> exception. Looking up a property before its value has been set is almost
> always an error. It is much better to immediately alert the user so they can
> fix the bug, rather than letting their program appear to work, but misbehave
> in some possibly subtle way.
> This applies to any situation where you try to access a value that is not
> currently available. For example, if you try to access a persistent property
> inside pageAttached(), it should throw an exception rather than simply
> returning null.
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