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From "Niall Pemberton (JIRA)" <>
Subject [jira] Commented: (BEANUTILS-293) LazyDynaMap.getDynaProperties() bug
Date Wed, 05 Sep 2007 13:29:33 GMT


Niall Pemberton commented on BEANUTILS-293:

LazyDynaMap is just a DynaBean wrapper for a Map - it just reflects the contents of the Map
and doesn't actually store any "dyna" properties. So when you call the "add" method if it
doesn't actually instantiate a default value then the "property" will not return a type. As
Henri points out certain types (also Number instances) are not automatically instantiated
by LazyDynaBean (which LazyDynaMap derives from) - however if you want different behaviour
these classes are designed so that you can easily override in your own custom implementation.
Perhaps LazyDynaMap is not suitable in this case - the main idea behind them was to provide
lazy list/array growth for any Map - more with the idea that you can wrap an existing Map
and have the lazy behaviour.

To answer Henri on "So any of those types will not get set up for some reason. I'm not sure
why. Anyone know?" - the idea behind these "lazy" implementations was to provide two types
of "lazy" behaviour - 1) lazy list/array growth and 2) automatic Map, list/array, Dyna Bean
and POJO bean instantiation. The motivation behind both of these was to overcome the "nested
null" type error when populating an object graph of more than one level. Unfortunately there
is no way of identifiying someones custom POJO java bean - so it simply tries to exclude common
non-bean type objects (Number instances are also not instantiated by default) - this isn't
optimal, but the way its designed makes it easy for people to provide their own custom behaviour.

IMO this is working as designed and I'm going to close as not a problem. I would suggest resolving
this in one of three ways:

1) Don't use LazyDynaMap (probably LazyDynaBean would be more suitable)
2) Override the LazyDynaMap default behaviour to provide default values
3) Don't use the "add" method - just set default values in the LazyDynaMap - e.g. lazyDynaMap.set("foo",

> LazyDynaMap.getDynaProperties() bug
> -----------------------------------
>                 Key: BEANUTILS-293
>                 URL:
>             Project: Commons BeanUtils
>          Issue Type: Bug
>          Components: Bean / Property Utils
>    Affects Versions: 1.8.0-BETA
>            Reporter: Davide Angelocola
>         Attachments: BEANUTILS-293-test.patch
>         LazyDynaMap lazyDynaMap = new LazyDynaMap();
>         lazyDynaMap.add("foo", String.class);
>         assertNotNull(lazyDynaMap.getDynaProperties()[0].getType());
> this test will fail. It is correct?

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