[conversion] Generic bean converter
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Key: LABS-235
URL: https://issues.apache.org/jira/browse/LABS-235
Project: Labs
Issue Type: Bug
Components: Magma
Affects Versions: Current
Reporter: Simone Gianni
Assignee: Simone Gianni
Fix For: Future
Currently Magma handles stuff in the web session correctly : it converts those
values using converters, and reconverts them back when needed. This way, there
is no serialization problem, and there is no JPA detached problem, because the
object in the session will be re-fetched from the DB when needed in subsequent
requests.
The problem arise when we save in the session in a bean that does not have a
converter, and even worse if this bean itself contains field which are JPA
entities. In that case, Magma will hold the bean in the session, since that's
perfectly legal, but those objects will became detached.
A possible solution could be a generic bean converter, based on XML or JSON or
similar to the Hibernate dehydrated representation. This should not use a
premade library, unless is quite extendable, cause it should use converters
recursively on the fields of the bean.
The only problem with this approach could be in URL generation. Since converter
are also used during URL parsing, and they will be used in URL generation when
cglib will arrive, this would mean exposing the bean internal structure to the
web. This is NOT a big security concern : most of the current web technologies
does this without any problem (JSON, web services .. even forms), but it could
be a functional problem cause URLs are limited in size and have strict parsing
limitations.
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