Hi Andrus,
On Aug 10, 2006, at 1:04 PM, Andrus Adamchik wrote:
> Ok, looks like I found the problem - all Cayenne jars and all
> dependencies (such as jpa spec, commons-logging, etc., etc.) have
> to be added to the "-bootclasspath" of the forked unit test (in
> addition to "-javaagent").
This might be an opportunity to look at the enhancer (agent) to see
why it has dependencies on Cayenne, jpa spec etc.) There should be a
pretty clear separation of the enhancer contract and the Cayenne
runtime behavior.
> A small problem remains - Maven2 doesn't seem to have a way to
> expose a combined dependency classpath in the POM as a property.
> Sucks...
>
I've found the Maven guys to be pretty responsive. If you describe
your problem well enough, they might turn around a patch in a few
days. Worst case, they will tell you how to write the fix yourself. :-)
Craig
> Andrus
>
>
> On Aug 9, 2006, at 11:38 AM, Andrus Adamchik wrote:
>
>> Hi Craig,
>>
>> I certainly realize the benefits of the enhancer in case of pseudo-
>> POJO JPA-style persistence, and I agree with your design points
>> (the same that you made during your presentation in Dublin).
>>
>> Unfortunately in practice it causes lots of pain, and I expect
>> more to come. Oh well, I'll keep banging my head against this
>> particular wall...
>>
>> Andrus
>>
>>
>> On Aug 9, 2006, at 11:30 AM, Craig L Russell wrote:
>>
>>> Hi Andrus,
>>>
>>> I think you will find the enhancer to be a very valuable tool to
>>> use to improve performance and the usability of Cayenne for JPA.
>>> All of the players in JPA use the enhancement concept to advantage.
>>>
>>> It's probably worthwhile working through these issues. With Java
>>> SE 5 supporting agents, it is much more portable than with
>>> previous releases.
>>>
>>> Surefire plugin will might need to be adapted to use the agent
>>> with forked jvm. I don't understand why it would be necessary if
>>> you're running in the same vm. The agent applies to all but the
>>> system class loader IIRC.
>>>
>>> By the way, you might post to open-jpa-dev alias because they use
>>> surefire for testing and they apparently have made it work ok.
>>>
>>>> We can probably keep the enhancer as an optional extension for
>>>> "Cayenne-like" behavior, including such "insignificant" things
>>>> like lazy relationship loading.
>>>
>>> I think JPA users will expect lazy loading to work correctly. And
>>> it's not just for relationships. Any expensive field (e.g.
>>> relationship, LOB) will benefit from lazy loading semantics.
>>>
>>> Craig
>>>
>>> On Aug 9, 2006, at 6:43 AM, Andrus Adamchik wrote:
>>>
>>>> Can confirm what IIRC Bill has mentioned before - using "-
>>>> javaagent" option during integration testing with Maven breaks
>>>> miserably. I created a separate Maven project with a piece of
>>>> configuration like that:
>>>>
>>>> <plugin>
>>>> <groupId>org.apache.maven.plugins</groupId>
>>>> <artifactId>maven-surefire-plugin</artifactId>
>>>> <configuration>
>>>> <forkMode>(tried all of them)</forkMode>
>>>> <childDelegation>(tried true and false)</childDelegation>
>>>> <argLine>-javaagent:...</argLine>
>>>> </configuration>
>>>> </plugin>
>>>>
>>>> The configuration above would load the agent, but since Maven
>>>> Surefire plugin installs its own ClassLoader for the unit tests,
>>>> the agent doesn't work (I saw a number of errors depending on
>>>> the combination of parameters). Will probably have to do it with
>>>> Ant.
>>>>
>>>> Also this almost make me want to rewrite the JPA context to
>>>> support true POJO's without an enhancer, as I suspect we'll be
>>>> plagued by enhancer related problems in various environments. We
>>>> can probably keep the enhancer as an optional extension for
>>>> "Cayenne-like" behavior, including such "insignificant" things
>>>> like lazy relationship loading.
>>>>
>>>> Andrus
>>>>
>>>
>>> Craig Russell
>>> Architect, Sun Java Enterprise System http://java.sun.com/
>>> products/jdo
>>> 408 276-5638 mailto:Craig.Russel..un.com
>>> P.S. A good JDO? O, Gasp!
>>>
>>
>>
>
Craig Russell
Architect, Sun Java Enterprise System http://java.sun.com/products/jdo
408 276-5638 mailto:Craig.Russel..un.com
P.S. A good JDO? O, Gasp!
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