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Date: Tue, 8 May 2012 08:09:59 -0500
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Subject: Re: Stress tests and configuration
From: Rick Curtis <curtisr7@gmail.com>
To: users@openjpa.apache.org
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Daniel -

Yes, I'd be interested in seeing the full exception. That being said,
you're probably safe just turning off the DynamicDataStructs . In our
performance testing, we never observed an improvement when that property is
enabled.

Since we're on the topic of properties, I'd also recommend getting rid of
the openjpa.Multithreaded property. Sharing EntityManagers / Entities
across multiple threads isn't something that OpenJPA was designed to do.
openjpa.Multithreaded was supposed to address that concern, but it did so
poorly. There are a number of outstanding JIRAs that document some of the
issues... I can dig them up if you'd like?

Thanks,
Rick

On Tue, May 8, 2012 at 1:43 AM, Daniel Persson <mailto.woden@gmail.com>wrote:

> Hi Rick.
>
> These are the actual stacktraces that you get with log level WARN. I
> changed to TRACE and got more information that actually lead me to beleave
> that the DynamicDataStructs where the problem. For some reason it could not
> handle special types of data. Without DynamicDataStructs it seems to work
> at the moment.
>
> Didn't save the stacktrace but I'm sure I got the null pointer exception on
>
> 365: BCMethod method = bc.declareMethod(name, type, new Class[]{ int.class
> });
>
> in DynamicStorageGenerator.java
>
> It didn't recognize the type supplied. If your interested I could turn the
> feature on and get a trace for you.
>
> Best regards
>
> Daniel
>
> On Mon, May 7, 2012 at 3:59 PM, Rick Curtis <curtisr7@gmail.com> wrote:
>
> > Daniel -
> >
> > Can you post the entire stacktrace? You've snipped out the important
> parts.
> >
> > Thanks,
> > Rick
> >
> > On Mon, May 7, 2012 at 3:19 AM, Daniel Persson <mailto.woden@gmail.com
> > >wrote:
> >
> > > Hi.
> > >
> > > I'd used OpenJPA for my projects for a while now and started to use it
> at
> > > work.
> > >
> > > Our service runs on Tomcat and have a lot of users. So after
> implementing
> > > OpenJPA for a few months we are now in the testing phase.
> > > During the stress test adding a few hundred records using different
> > tomcat
> > > threads I get the same OpenJPA error over and over.
> > >
> > > I've changed the configuration back and forth to resolve the issue.
> > > Sometimes I get it to work for a while and then it breaks again.
> > > So I would like to ask what the error could be a result of and if I
> have
> > > any obvious configuration faults.
> > >
> > > I've written a small test class adding entities using 1000 threads and
> > this
> > > will generate the errors from time to time.
> > > The code uses one factory and a lot of managers.
> > >
> > > <openjpa-2.1.1-r422266:1148538 fatal store error>
> > > org.apache.openjpa.persistence.RollbackException: null
> > >        at
> > >
> > >
> >
> org.apache.openjpa.persistence.EntityManagerImpl.commit(EntityManagerImpl.java:593)
> > >
> > > Caused by: <openjpa-2.1.1-r422266:1148538 nonfatal general error>
> > > org.apache.openjpa.persistence.PersistenceException: null
> > >        at
> > >
> >
> org.apache.openjpa.kernel.BrokerImpl.afterCompletion(BrokerImpl.java:2018)
> > >        at
> > >
> > >
> >
> org.apache.openjpa.kernel.LocalManagedRuntime.commit(LocalManagedRuntime.java:94)
> > >        at
> > org.apache.openjpa.kernel.BrokerImpl.commit(BrokerImpl.java:1498)
> > >        at
> > >
> > >
> >
> org.apache.openjpa.kernel.DelegatingBroker.commit(DelegatingBroker.java:933)
> > >        at
> > >
> > >
> >
> org.apache.openjpa.persistence.EntityManagerImpl.commit(EntityManagerImpl.java:569)
> > >        ... 27 more
> > > Caused by: java.lang.NullPointerException
> > >
> > >
> > > <persistence xmlns="http://java.sun.com/xml/ns/persistence"
> xmlns:xsi="
> > > http://www.w3.org/2001/XMLSchema-instance" version="1.0">
> > >    <persistence-unit name="userDbPersistence"
> > > transaction-type="RESOURCE_LOCAL">
> > >
> >  <non-jta-data-source>java:comp/env/jdbc/userDb</non-jta-data-source>
> > >
> > >        <class>......</class>
> > >
> > >        <properties>
> > >            <property name="openjpa.Multithreaded" value="true" />
> > >            <property name="openjpa.InverseManager" value="true" />
> > >            <property name="openjpa.DynamicDataStructs" value="true"/>
> > >            <property name="openjpa.Compatibility"
> > >
> > >
> >
> value="QuotedNumbersInQueries=true,CopyOnDetach=true,cascadeWithDetach=true,superclassDiscriminatorStrategyByDefault=false"
> > > />
> > >            <property name="openjpa.DataCache"
> value="true(CacheSize=1000,
> > > SoftReferenceSize=0)"/>
> > >            <property name="openjpa.QueryCache" value="false"/>
> > >            <property name="openjpa.RemoteCommitProvider" value="sjvm"/>
> > >            <property name="openjpa.Log" value="DefaultLevel=WARN,
> > > Runtime=WARN, Tool=WARN, SQL=WARN"/>
> > >            <property name="openjpa.FetchBatchSize" value="0"/>
> > >            <property name="openjpa.DetachState"
> > > value="fetch-groups(DetachedStateField=true)"/>
> > >            <property name="openjpa.LockTimeout" value="3000"/>
> > >            <property name="openjpa.jdbc.EagerFetchMode" value="join" />
> > >            <property name="openjpa.jdbc.SubclassFetchMode"
> > > value="parallel" />
> > >        </properties>
> > >    </persistence-unit>
> > > </persistence>
> > >
> > > Any tips or suggestions are much appreciated. Have tried a lot of
> > different
> > > configurations. One requirement for the configuration as well is that
> we
> > > want to use some sort of caching because this was one of the reason for
> > the
> > > shift to openJPA.
> > >
> > > Best regards
> > >
> > > Daniel
> > >
> >
> >
> >
> > --
> > *Rick Curtis*
> >
>


-- 
*Rick Curtis*

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