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From "Michael Dick (JIRA)" <j...@apache.org>
Subject [jira] Updated: (OPENJPA-969) In the JEE Environment a second datasource must be specified to create the OpenJPA sequence table
Date Tue, 17 Mar 2009 15:24:50 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Dick updated OPENJPA-969:
---------------------------------

             Priority: Minor  (was: Major)
    Affects Version/s: 1.2.1
           Issue Type: Improvement  (was: Bug)
              Summary: In the JEE Environment a second datasource must be specified to create
the OpenJPA sequence table  (was: In the J2ee environment, when the sequence table is used
for identity, if only one datasource is created, the application hangs. )

Upon further investigation this problem only exists if the sequence table doesn't exist and
the application is relying on openjpa.jdbc.SynchronizeMappings to create the tables automatically.
In that case the application requires a non-jta-data-source or openjpa.Connection2xxx properties
in order to create the table.  

This was beyond the scope of the original enhancement to allow sequence values to be obtained
without using a non-jta-data-source. 

> In the JEE Environment a second datasource must be specified to create the OpenJPA sequence
table
> -------------------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-969
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-969
>             Project: OpenJPA
>          Issue Type: Improvement
>          Components: jdbc
>    Affects Versions: 1.2.1, 2.0.0
>            Reporter: Fay Wang
>            Assignee: Michael Dick
>            Priority: Minor
>
> The openjpa manual states clearly that a second unmanaged DataSource is required for
updating sequence table (page 205: 4.2.1. Managed and XA DataSources): 
> "When using a managed DataSource, you should also configure a second unmanaged DataSource
that OpenJPA can use to perform tasks that are independent of the global transaction. The
most common of these tasks is updating the sequence table OpenJPA uses to generate unique
primary key values for your datastore identity objects. Configure the second DataSource using
the non-jta-data-source persistence.xml element, or OpenJPA's various "2" connection properties,
such as openjpa.ConnectionFactory2Name or openjpa.Connection2DriverName. These properties
are outlined in
> Chapter 2, Configuration [161]."
> Openjpa, however, does not this rule when Sequence table is involved. As a result, the
application hangs when only one datasource is configured. This is not very user-friendly.
An error message should be thrown when this situation is detected. 

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