[Jpox-issues] [JPOX JIRA] Commented: (NUCDBFO-39) Make the exception, that is thrown when an ID of wrong type is put in PersistenceManager#getObjectById(Class, Object), more self-explanatory.

[Andy J. (JIRA) <web...@jp...>]

    [ http://www.datanucleus.org/servlet/jira/browse/NUCDBFO-39?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16703#action_16703 ] 

Andy Jefferson commented on NUCDBFO-39:
---------------------------------------

And please use current SVN trunk of core since that has a change

> Make the exception, that is thrown when an ID of wrong type is put in PersistenceManager#getObjectById(Class, Object), more self-explanatory.
> ---------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: NUCDBFO-39
>                 URL: http://www.datanucleus.org/servlet/jira/browse/NUCDBFO-39
>             Project: DataNucleus DB4O
>          Issue Type: Improvement
>          Components: Queries
>    Affects Versions: 1.1.0.release
>            Reporter: Costantino Cerbo
>            Priority: Minor
>         Attachments: id_is_exception_test.zip
>
>
> When you want to get an object by id using PersistenceManager#getObjectById(Class, Object) and you use a wrong type (for example, your ID is Long and you put a String) the following exception occurs:
> Exception in thread "main" java.lang.NullPointerException
> at org.datanucleus.store.db4o.DB4OPersistenceHandler.findObject(DB4OPersistenceHandler.java:603)
> at org.datanucleus.ObjectManagerImpl.findObject(ObjectManagerImpl.java:2330)
> at org.datanucleus.jdo.JDOPersistenceManager.getObjectById(JDOPersistenceManager.java:1675)
> at org.datanucleus.jdo.JDOPersistenceManager.getObjectById(JDOPersistenceManager.java:1771)
> at org.datanucleus.test.Main.main(Main.java:45) 
> That happens because  in DB4OPersistenceHandler#findObject(ObjectManager, Object) a JDOFatalInternalException is propagated through the object "id".
> The JDOFatalInternalException said:
>   The key value passed to construct a SingleFieldIdentity of type "javax.jdo.identity.LongIdentity" for class "org.datanucleus.test.Person" is of an incorrect type ("java.lang.String") - should be "Long".
> It think it would be better to thrown the JDOFatalInternalException because the NullPointerException is not very self-explanatory.
>  

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