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Re: [eclipselink-dev] Bug 456067 - javax.persistence.query.timeout
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I agree, if the implementation observes the hint it should conform to
the format.
MartiNG
On 13.01.15 17:19, Rick Curtis wrote:
My vote is that this is a bug and it wasn't a conscious deviation from
the spec. In the final version of the JPA-2.0 spec this property is
defined as "javax.persistence.query.timeout // time in milliseconds".
If you dig a bit deeper into spec history and look at an early draft
version[1] you will find the following:
javax.persistence.lock.timeout // time in seconds
Open Issue: Whether units should be seconds or milliseconds
I suspect what happened is that this hint was implemented prior to the
spec coming to a decision on seconds vs milliseconds. Once the
decision was made to use milliseconds, the runtime was never updated.
While it is true that JDBC under the covers doesn't handle
milliseconds, I don't think that drove the decision of this
implementation. (Someone please correct me if I'm wrong)
Now that we understand how we got to where we are, what to do? In my
eyes this is a spec compliance issue vs existing user situation. My
vote is to update the hint to (only on trunk, leave existing
branches/releases alone) adhere to the spec and add a property that
will allow existing users to get the old behavior back.
Thoughts?
Thanks,
Rick
[1]
http://download.oracle.com/otndocs/jcp/java_persistence-2_0-edr-oth-JSpec/
On Mon, Jan 12, 2015 at 10:09 AM, William Dazey <dazeydev.3@xxxxxxxxx
<mailto:dazeydev.3@xxxxxxxxx>> wrote:
I was looking over this reported bug in DatabaseCall class and
wanted to see if someone could weight-in on the reason for using
Seconds rather than Milliseconds as indicated in the 2.0 spec?
After looking over the code and spec, it seems the property is
provider dependent. I'm thinking EclipseLink chose to use Seconds
since it is the unit of time that
java.sql.Statement.setQueryTimeout(int seconds) assumes you are
passing. I could write up a patch that would add support for any
duration by adding a new property, but the user still would have
to understand that in the end, whole seconds are being used as the
timeout duration and fractional seconds will be rounded. Is this
support necessary? Thoughts?
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--
*Rick Curtis*
--
Martin Grebac, SW Engineering Manager
Oracle Czech, Prague