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From "Abe White (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-238) Error in XMLFileHandler, failed to load field element with type org.apace.openjpa.util.StringId.
Date Tue, 15 May 2007 15:18:16 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12496016
] 

Abe White commented on OPENJPA-238:
-----------------------------------

Custom id classes can have either a (Class,String) or just a String constructor.  So the patch
can't just assume a (Class,String) constructor -- it has to check to see what the class has.
 That's pretty ugly and still won't cover certain cases, but it'll work for this user and
previous users.

If we really want to make a proper solution, we'd write out the class of the entity and the
stringified oid instead of the class of the oid and the stringified oid.  Then in fromXMLString
we'd check to see if relMeta uses datastore identity and if so construct a LongId from the
stored entity class and string.  If not we'd use PCRegistry.newObjectId(Class,String).  We'd
also need the old processing for old XML files... we could detect an old file by maybe adding
a new version attribute to the top-level <extent> element -- old files will be missing
the version attribute.

> Error in XMLFileHandler, failed to load field element with type org.apace.openjpa.util.StringId.
> ------------------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-238
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-238
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: xml store
>            Reporter: Catalina Wei
>         Attachments: XMLFileHandler.java.patch
>
>
> Problem reported by Ngo, Anh (full description with attachments can be found in openjpa-dev
mails, subject title: xml store help?
> In evaluating openJPA to use for our current project.  It works fine for our need with
database.  But I am having problem with the XMLStoreManager.  I have two simple objects -
Customer and User.  Customer can have multiple users.  I look at the object store in xml file.
 It stored like this:
>  
> <?xml version="1.0" encoding="UTF-8"?>
> <extent>
>     <object class="net.iss.mss.jpa.examples.remedy.Customer" oid="1" version="0">
>         <field name="customerId">
>             "1"
>         </field>
>         <field name="customerName">
>             "customer1"
>         </field>
>         <field name="users">
>             <element>
>                 org.apache.openjpa.util.StringId:1
>             </element>
>             <element>
>                 org.apache.openjpa.util.StringId:2
>             </element>
>         </field>
>     </object>
> </extent>
>  
> Shoud the Users element store User object?  The XMLStoreManager failed to load data in
because it doest not know how to create this object:                org.apache.openjpa.util.StringId:1
>  
> Please help...

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