Hi Pinaki,Thank you for your quick response. This topic is a little tricky. Let
me go a little further.I wrote a test case to test this function. Here is the
code snip:JarLoader cl =
JarLoader.getInstance();JPAUtil.loadOpenJPA("D:\\java\\openjpa0.9.7",
cl);EntityManagerFactory result =
JPAUtil.getEntityManager(cl);assertNotNull(result);When I added OpenJPA as
compile/runtime lib to the project. And comment No. 2 line, the case was
passed.After drop OpenJPA, put No.2 line back, I will get the error. I have
"META-INF/openjpa.xml" and "META-INF/persistence.xml". The error happened when
I create the EntityFactory, I am not sure logging system was initialized at
that point of time.Any thoughts?Thanks,Gene.> Subject: RE: Classloader Question
of OpenJPA.> Date: Fri, 17 Aug 2007 02:47:13 -0700> From: [EMAIL PROTECTED]>
To: [email protected]> > Hi Gene,> I may not have understood full import
of your classloading> environment.> So following may not be relevant to your
context:> 1. The exception most likelely shows that OpenJPA is not finding
any> META-INF/persistence.xml resource in your classpath. Thie>
META-INF/persistence.xml is loaded by the thread'c context classloader>
(Classloader.getResourceAsStream()). So placing the directory in the> classpath
that has META-INF/persistence.xml relative to it may solve> your problem.> 2.
You may elaborate more on the execution environment and packaging> of your
OpenJPA application.> 3. Setting <property name="openjpa.Log"
value="DefaultLevel=TRACE"/>> in META-INF/persistence.xml prints detailed
information. If you post it,> it will help diagnose the error. > > > Pinaki
Poddar> 972.834.2865> > -----Original Message-----> From: Gene Wu
[mailto:[EMAIL PROTECTED] > Sent: Friday, August 17, 2007 2:15 AM> To:
OpenJPADev> Subject: Classloader Question of OpenJPA.> > > > > Hi,I am writing
a handy tools with a simple user interface. It can> verify persistence.xml and
annotation setting of the classes of. Also,> it can run JPQL like the SQL
browser.In this case, I implemented a basic> classloader to load those
persistence entity classes from Jar files,> which were configurable from UI.
Here are my initial thoughts:1.> Classloader will load OpenJPA and persistence
classes.-- I tried. My> classloader is too simple to make a perfect support of
every requirement> from OpenJPA. It failed when it was loading FactoryBroker.
After I> inject my classload to Thread, I still have the following error:>
"Caused by: <0.0.0 fatal general error>>
org.apache.openjpa.persistence.PersistenceException: There was an error> when
invoking the static getInstance method on the named factory class>
"org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory". See the nested> exception
for details." "Caused by:> java.util.MissingResourceException:>
org.apache.openjpa.persistence.PersistenceProductDerivation:java.lang.Nu>
llPointerException"2. Classloader load persistence classes only.-- I> didn't
find a way to have a special class loader to load the persistence> entity class
in OpenJPA. Does any one have experience on that? Maybe we> can have an
entrance in OpenJPAPersistence for specified classloader by> user.Thanks,Gene.>
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