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From "Fay Wang (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-969) In the J2ee environment, when the sequence table is used for identity, if only one datasource is created, the application hangs.
Date Tue, 10 Mar 2009 04:50:50 GMT
In the J2ee environment, when the sequence table is used for identity, if only one datasource
is created, the application hangs. 
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                 Key: OPENJPA-969
                 URL: https://issues.apache.org/jira/browse/OPENJPA-969
             Project: OpenJPA
          Issue Type: Bug
          Components: jdbc
    Affects Versions: 2.0.0
            Reporter: Fay Wang
            Assignee: Fay Wang


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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