I am using Tomcat 5.5.4. I am almost certain it is OJB. I created a
stripped down context with the minimum classes needed to run OJB and
could pin the memory increase to touching anything that initiallized
OJB. I have also chased down other known offenders such as deregistering
the database driver and logging.
Danilo Tommasina wrote:
Sorry I still did not update to 1.0.4 and was not able to test it out
against the memory leak.
We are using a patched version of OJB, patched by myself, but as long
as I remember it is almost the same code as in the 1.0.4 version.
what app- web-server are you using? version? note that in tomcat
versions < 4.1.31 and probably some earlier 5.5.x verions there were
bugs that prevented a clean shutdown of a web-application.
Do you have any threads or other stuff that is still running? External
libraries?
We had the same problem caused by the quartz scheduler for example.
As soon as I can, I'll try to update to 1.0.4 and test out the memory
leak problem.
cheers
Danilo
Rick Roman wrote:
OK I'm really on version 1.0.4 now and all of these methods run
without error. Unfortunately, none of them have any effect on the
memory leak.
PersistenceBroker broker =
PersistenceBrokerFactory.defaultPersistenceBroker();
broker.clearCache();
broker.close();
PersistenceBrokerFactory.releaseAllInstances();
ConnectionFactoryFactory.getInstance().createConnectionFactory().releaseAllResources();
PersistenceBrokerThreadMapping.shutdown();
PersistenceBrokerFactoryFactory.instance().shutdown();
PersistenceBrokerFactory.shutdown();
Rick Roman wrote:
You were correct. I had a ghost version of 1.0.3 in my path. Thanks.
Antonio Gallardo wrote:
hi,
Seems like an class loader issue. Can you check if there are not
older ojb.jar in your classpath loaded before the ojb 1.0.4?
Best Regards,
Antonio Gallardo.
Rick Roman wrote:
I upgraded to the new db-ojb-1.0.4 which has the method
PersistenceBrokerFactoryFactory.instance().shutdown();
This results in exception:
[ERROR] mffweb] - Exception sending context destroyed event to
listener instance of class org.mff.web.listener.CleanupListener
<java.lang.NoSuchMethodError:
org.apache.ojb.broker.core.PersistenceBrokerThreadMapping.shutdown()V>java.lang.NoSuchMethodError:
org.apache.ojb.broker.core.PersistenceBrokerThreadMapping.shutdown()V
at
org.mff.web.listener.CleanupListener.contextDestroyed(CleanupListener.java:59)
Still have memory leak or (I suppose more accurtately, failure to
clean up resources). Anyone have any ideas or has anyone ever
actually been able to avoid this problem or am I just stuck with it?
Armin Waibel wrote:
Hi Rick,
Rick Roman wrote:
Sorry to be dense but can you send me the link to cvs for
revision 1.4.2.2 of PersistenceBrokerFactoryIF? I'm having
trouble locating it.
Think this will not work, because the changes will affect other
classes too.
http://www.mail-archive.com/[email protected]/msg01553.html
I recommend to use the latest from OJB 1.0.x branch
(OJB_1_0_RELEASE branch, trunk is unstable 1.x). The 1.0.x branch
is 95% stable (the test-suite show some odmg-api specific test
failures, will be fixed soon).
regards,
Armin
Ilkka Priha wrote:
Rick,
It was introduced in revision 1.4.2.2 of
PersistenceBrokerFactoryIF (25/07/05), so it's available only
in the cvs version of OJB, but hopefully quite soon also as
1.0.4-rc.
-- Ilkka
/**
* Shutdown method for OJB, kills all running processes within
OJB - after
* shutdown OJB can no longer be used.
* <br/>
* This method is introduced to solve hot/redeployment problems
(memory leaks) caused by
* the usage of [EMAIL PROTECTED] ThreadLocal} instances in OJB source and
the reuse of threads
* by the container (e.g. servlet- or ejb-container).
*/
public void shutdown();
Rick Roman wrote:
Hi Ilkka,
shutdown() does not appear to be a method of
PersistenceBrokerFactoryFactory.instance(). Is there a patch
with this available?
Ilkka Priha wrote:
Hi Rick,
Have you tried this one, it alone should do the job.
PersistenceBrokerFactoryFactory.instance().shutdown();
-- Ilkka
Rick Roman wrote:
Update: From other threads, I have tried using a
contextDestroy listener to run:
PersistenceBroker broker =
PersistenceBrokerFactory.defaultPersistenceBroker();
broker.clearCache();
broker.close();
PersistenceBrokerFactory.releaseAllInstances();
ConnectionFactoryFactory.getInstance().createConnectionFactory().releaseAllResources();
PersistenceBrokerThreadMapping.shutdown();
MetadataManager.getInstance().removeAllProfiles();
and the leak still persists.
Rick Roman wrote:
I am using OBJ to access PostgreSQL via a JNDI datasource.
My problem is that every time I reload my application
context, I get a big jump in Tomcat Perm Gen memory. After
a several reloads, tomcat eventually crashes with an out of
memory error. I believe this has to do with my OBJ
configuration as I am able to access the datasource without
OBJ and I don't see the problem. The memory leak problem is
a known issue, discussed in detail here:
http://opensource2.atlassian.com/confluence/spring/pages/viewpage.action?pageId=2669
In short, the problem is that "if any object that is loaded
by the system or container classloader (StandardClassLoader
in tomcat) still has a reference to the application class
loader or any object loaded by it, the class loader will
not be garbage collected. In that case, all the class
objects and every object referenced by a static field in
any of the classes will not be garbage collected."
Does anyone know how I can get rid of this behavior?
(repository.xml, OBJ.properties below)
repository.xml
<jdbc-connection-descriptor
jcd-alias="default"
default-connection="true"
platform="PostgreSQL"
jdbc-level="3.0"
jndi-datasource-name="java:comp/env/jdbc/mff/mffweb"
eager-release="false"
batch-mode="false"
useAutoCommit="1"
ignoreAutoCommitExceptions="false" >
<object-cache
class="org.apache.ojb.broker.cache.ObjectCacheDefaultImpl">
<attribute attribute-name="cacheExcludes"
attribute-value=""/>
<attribute attribute-name="timeout"
attribute-value="900"/>
<attribute attribute-name="autoSync"
attribute-value="true"/>
<attribute attribute-name="cachingKeyType"
attribute-value="0"/>
</object-cache>
<sequence-manager
className="org.apache.ojb.broker.util.sequence.SequenceManagerNextValImpl">
</sequence-manager>
</jdbc-connection-descriptor >
OBJ.properties
repositoryFile=repository.xml
useSerializedRepository=false
serializedRepositoryPath=.
PersistenceBrokerFactoryClass=org.apache.ojb.broker.core.PersistenceBrokerFactoryDefaultImpl
PersistenceBrokerClass=org.apache.ojb.broker.core.PersistenceBrokerImpl
maxActive=256
maxIdle=-1
maxWait=2000
timeBetweenEvictionRunsMillis=-1
minEvictableIdleTimeMillis=1000000
whenExhaustedAction=0
ConnectionFactoryClass=org.apache.ojb.broker.accesslayer.ConnectionFactoryPooledImpl
ConnectionManagerClass=org.apache.ojb.broker.accesslayer.ConnectionManagerImpl
SqlGeneratorClass=org.apache.ojb.broker.accesslayer.sql.SqlGeneratorDefaultImpl
IndirectionHandlerClass=org.apache.ojb.broker.core.proxy.IndirectionHandlerDefaultImpl
ListProxyClass=org.apache.ojb.broker.core.proxy.ListProxyDefaultImpl
SetProxyClass=org.apache.ojb.broker.core.proxy.SetProxyDefaultImpl
CollectionProxyClass=org.apache.ojb.broker.core.proxy.CollectionProxyDefaultImpl
StatementManagerClass=org.apache.ojb.broker.accesslayer.StatementManager
JdbcAccessClass=org.apache.ojb.broker.accesslayer.JdbcAccessImpl
RowReaderDefaultClass=org.apache.ojb.broker.accesslayer.RowReaderDefaultImpl
descriptorBasedCaches=false
LockManagerClass=org.apache.ojb.broker.locking.LockManagerInMemoryImpl
LockTimeout=60000
OqlCollectionClass=org.apache.ojb.broker.util.collections.ManageableArrayList
SqlInLimit=200
ImplementationClass=org.apache.ojb.odmg.ImplementationImpl
OJBTxManagerClass=org.apache.ojb.odmg.LocalTxManager
cascadingDeleteOneToOne=false
cascadingDeleteOneToN=false
cascadingDeleteMToN=false
ImplicitLocking=true
LockAssociations=WRITE
DListClass=org.apache.ojb.odmg.collections.DListImpl
DArrayClass=org.apache.ojb.odmg.collections.DListImpl
DMapClass=org.apache.ojb.odmg.collections.DMapImpl
DBagClass=org.apache.ojb.odmg.collections.DBagImpl
DSetClass=org.apache.ojb.odmg.collections.DSetImpl
PersistentFieldClass=org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDirectAccessImplNew
JTATransactionManagerClass=org.apache.ojb.broker.transaction.tm.JBossTransactionManagerFactory
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