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https://issues.apache.org/jira/browse/OPENJPA-586?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pinaki Poddar reassigned OPENJPA-586:
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Assignee: Pinaki Poddar
> Binding Query parameter fails validation for Externalized field
> ---------------------------------------------------------------
>
> Key: OPENJPA-586
> URL: https://issues.apache.org/jira/browse/OPENJPA-586
> Project: OpenJPA
> Issue Type: Bug
> Reporter: Pinaki Poddar
> Assignee: Pinaki Poddar
> Attachments: patch-586.1.txt
>
>
> OpenJPA supports a field f of declared type <T> be persisted in database
> corresponding to a different type <S> when f specifies a two-way
> transformation between <S> and <T>. For example, a field f can be declared as
> java.net.URL but stored in database as String (i.e. VARCHAR).
> Now the question is:
> When an 'externalized' field f occurs in query predicate and is bound by
> a parameter p what should be the runtime type of p?
> The documentation [1] says p can be of either <T> or <S>.
> But the code breaks during parameter validation if Class(p) = <T> and with
> data conversion error if Class(p) = <S>
> Example:
> 1. Declare a persistent field f of type java.util.UUID externalized to
> java.lang.String with a pair of transformer functions
> @Persistent
> @Externalizer("toString")
> @Factory("UUID.fromString")
> private UUID uuid;
> 2. Use the field f in a Query with a binding parameter:
> String jpql = "SELECT p FROM ExternalValues p WHERE p.uuid=:uuid";
> Query query = em.createQuery(jpql);
> 3. Try to set parameter on the query:
> a) query.setParameter("uuid", new UUID(1,2)); // parameter type
> equals declared type of f
> or
> b) query.setParameter(1, new UUID(1,2).toString()); // parameter
> type equals externalized type of f
> 4. Either of step 3a or 3b will result in runtime exception
> [1]
> http://openjpa.apache.org/docs/latest/manual/manual.html#ref_guide_pc_extern
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