Thanks Kevin,
We're enhancing at build time:
http://svn.apache.org/repos/asf/webservices/juddi/trunk/juddi-core/pom.xml
Yeah we've been running load tests and things are nice and stable with
Hibernate but with Openjpa we see increasing memory use, blocking
threads and then an OOM. http://issues.apache.org/jira/browse/JUDDI-267.
Our preference would be to ship with openjpa by default; but our build
supports both hibernate and openjpa.
And yes we use openjpa 1.2.1 (latest stable version).
--Kurt
Kevin Sutter wrote:
Interesting detective work, Kurt. Thanks.
Why the WebService version of the app would behave differently as far as GC
is concerned is a mystery. And, you said that plugging in Hibernate into
this scenario, everything works okay? Very confusing.
How are you performing the Entity enhancement processing? Are you
pre-enhancing via your build process? Or, are you using the -javaagent
mechanism? Or, are you falling back to the subclassing support within
OpenJPA? (See [1] for more information on these questions in case they
don't make sense.)
This would be one area that is different between Hibernate and OpenJPA --
enhancement processing.
In the Tomcat environment, you may be falling back to the subclassing
support (which we do not recommend) and hitting a memory leak with that.
You said OpenJPA 1.2.x, right?
Just a couple of thoughts on the subject...
Kevin
[1]
http://webspherepersistence.blogspot.com/2009/02/openjpa-enhancement.html
On Wed, Jan 13, 2010 at 4:25 PM, Kurt T Stam <[email protected]> wrote:
The same code executed straight from a java client (inVM) shows no memory
leak.
So is the fact that it is WebService significant then? What else can be
different? I think one thread remains up, and somehow this causes openjpa
not being able to clean up after itself. What can I do to debug this more? I
can actually see in the profiler that the objects are allocated by the
WebService, but why aren't they cleaned up?
Thx,
--Kurt
Kurt T Stam wrote:
Thanks Kevin, thanks for your response.
I just replaced the static call by:
apiAuthToken = new org.uddi.api_v3.AuthToken();
apiAuthToken.setAuthInfo(modelAuthToken.getAuthToken());
//MappingModelToApi.mapAuthToken(modelAuthToken,
apiAuthToken);
which did not make a difference.
I'm wondering if the fact that my class is a webservice makes a
difference. I'll try extracting it into
a regular class with a main method and profile that. At least I know that
I didn't forget something
completely obvious..
--Kurt
Kevin Sutter wrote:
Kurt,
I agree that this is very common usage of the JPA programming model.
And,
we are not aware of any memory leaks. About the only thing that jumps
out
at me is the following two lines:
apiAuthToken = new org.uddi.api_v3.AuthToken();
MappingModelToApi.mapAuthToken(modelAuthToken,
apiAuthToken);
What do these do? Can you comment these out and see if the memory leak
still exists? Since you are passing the modelAuthToken into this method,
I
don't know what it's doing with the reference and could it be holding
onto
something to prevent the GC from cleaning up?
The rest of your example seems very straight forward with creating and
persisting objects.
Kevin
On Wed, Jan 13, 2010 at 2:09 PM, Rick Curtis <[email protected]> wrote:
If you change the 1000 to something like 1000000... does your
application
go
OOM? Are you running in a JSE environment? What is PersistenceManager?
On Wed, Jan 13, 2010 at 2:05 PM, Kurt T Stam <[email protected]>
wrote:
BTW I'm running with the cache off
<property name="openjpa.DataCache" value="false"/>
(that turns it off right?)
--Kurt
Kurt T Stam wrote:
Hi guys,
[DESCRIPTION] The code below inserts a 1000 records in the database.
for (int i=1; i<1000; i++) {
EntityManager em = PersistenceManager.getEntityManager();
EntityTransaction tx = em.getTransaction();
try {
tx.begin();
// Generate auth token and store it!
String authInfo = AUTH_TOKEN_PREFIX + UUID.randomUUID();
org.apache.juddi.model.AuthToken modelAuthToken = new
org.apache.juddi.model.AuthToken();
if (authInfo != null) {
modelAuthToken.setAuthToken(authInfo);
modelAuthToken.setCreated(new Date());
modelAuthToken.setLastUsed(new Date());
modelAuthToken.setAuthorizedName(publisherId);
modelAuthToken.setNumberOfUses(0);
modelAuthToken.setTokenState(AUTHTOKEN_ACTIVE);
em.persist(modelAuthToken);
}
apiAuthToken = new org.uddi.api_v3.AuthToken();
MappingModelToApi.mapAuthToken(modelAuthToken,
apiAuthToken);
tx.commit();
} finally {
if (tx.isActive()) {
tx.rollback();
}
em.clear();
em.close();
}
}
[ISSUE]
After it leaving this code I end up with a 1000
org.apache.juddi.model.AuthToken objects in memory. I've been using
the
profiler, and these objects cannot be garbage collected.
This seems to be pretty the most common use case of using an
OR-mapping
tool, so I find it hard to believe openjpa has a memory leak here.
Does
anyone see what I'm doing wrong? Or can someone point me to an example
that
does not exhibit this behavior? BTW same code using hibernate does not
accumulate these objects.
We're using openjpa 1.2.1.
Thx,
Kurt
Apache jUDDI.
--
Thanks,
Rick
