Eclipse Community Forums: EclipseLink » NPE on concurrent entity manager access

Home » Eclipse Projects » EclipseLink » NPE on concurrent entity manager access

NPE on concurrent entity manager access [message #385457]

Wed, 11 February 2009 10:48

Eclipse User

Hi,

I get a NPE

org.eclipse.persistence.internal.databaseaccess.Parameterize dSQLBatchWritingMechanism.executeBatchedStatements(Parameter izedSQLBatchWritingMechanism.java:147)

with accessing a single entity manager concurrently (update + select or
select + select). Obviously the "this.previousCall" in that line is null
(also seen in debugger). This is no "stable" behavior meaning that
sometimes no such exception occurs - but something else then goes wrong.

So my question: is it allowed to access the entity manager concurrently in
general? Use case here is that I wait for a entity being updated in the
database and both tasks (=threads), the one updating and the one reading
by way of a query use the same entity manager.

Best regards,
JOhannes

Re: NPE on concurrent entity manager access [message #385458 is a reply to message #385457]

Wed, 11 February 2009 10:55

Eclipse User

I just rememberred I already got a note on this, found it again here:
http://www.eclipse.org/newsportal/article.php?id=581&gro up=eclipse.rt.eclipselink#581

So the question seems answered already - unfortnately for me with the
wrong answer :-(.

Though I would keep interested to know where this is defined/documented as
I did not find this in the api doc so far.

Best regards,
JOhannes

Previous Topic:	Problems creating an XML Project from an XML Schema
Next Topic:	SQL statement that createNamedQuery(...) method sent to the database?

Goto Forum:

-=] Back to Top [=-

Current Time: Fri Jul 04 11:55:42 EDT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter