mananthakris wrote:
Sorry i checked changing the method to what was suggested on the
findByPrimarykey page, but the broker class does not seem to have that
method in the version we use.
yep, this was introduced in a higher version of OJB.
This is the code we are currently using for findByPrimarykey
String[] keyArray = {key};
Identity id = new Identity(null,ojbClass,keyArray);
QueryByIdentity q = QueryFactory.newQuery(id);
broker = //get it from current odmg transaction
data = broker.getObjectByQuery(q);
return data
I could change data to use broker.getObjectByIdentity(id). Will that help?
Maybe. With
String[] keyArray = {key};
Identity id = new Identity(null,ojbClass,keyArray);
broker = //get it from current odmg transaction
data = broker.getObjectByIdentity(id);
OJB will definitely first lookup the cache for the specified object
before a DB-query will be performed.
It
does not look like the page on OJB tutorial that creates an Identity with
only one parameter. We use VARCHAR Ids in our system.
You can create Identity objects with single or compounded PK's (All
common data types are supported (long, Long, String, Date, ....)). It's
only mandatory that all PK fields of the class defined in the repository
mapping file are included when creating the Identity object.
regards,
Armin
mananthakris wrote:
Thanks for the quick response.We are using OJB1.0rc4. yes we can use
getObjectByIdentity. But the stack trace of the error shows that
getObjectByQuery is internally calling getObjectByIdentity,so did not
think this would help. How can we find how many objects are materialized
at a given time?
Here since it is byPrimarykey i am assuming at this point of time it is
trying to materialize only one object or its all related objects too.
Also what does that the stack trace mean by saying that
getObjectByIdentity calls getReferencedObject and
persistenceBrokerImpl.retrieveCollections (does it try to get all related
objects if an object is requested?)
Attached is the OJB.properties file and our repository file
Armin Waibel wrote:
Hi,
could you post the OJB.properties and jdbc-connection-descriptor too?
This would help to find problematic settings.
Which version of OJB do you use?
mananthakris wrote:
Hi,
We are using OJB with Jboss,Mysql on linux.
We have implemented all we could as suggested by OJB performance
tutorial.
We are using Proxies,default cache,PB-api,odmg transaction,but we can't
use
getIteratorByQuery because the results are processed after the
transaction
is closed. We are facing outofmemory error in two places always. One
while
materializing subject from proxy and two using getObjectByQuery for
finding
an object by primarykey.
Isn't it possible to lookup the object by Identity instead of using a
query?
http://db.apache.org/ojb/docu/tutorials/pb-tutorial.html#Find+object+by+primary+key
It happens only if a lot of users around 200 are
using the system.
How many objects are materialized?
regards,
Armin
We have two tier systems with jboss running on a linux
machine with 4GB ram and we have also finetuned jvm options that has
reduced
frequency of OutOfMemoryError (we use -Xms768M -Xmx768M
-XX:NewSize=256M)
Any suggestions are appreciated? Should we be looking at mysql
performance,any good tools for profiling ojb?
Here is the stack trace of two errors
1)java.lang.OutOfMemoryError
rethrown as
org.apache.ojb.broker.PersistenceBrokerException
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollection(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollections(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getExtentDBObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByIdentity(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getReferencedObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveReference(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveReferences(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByIdentity(Unknown
Source)
at
org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByIdentity(Unknown
Source)
at
org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByIdentity(Unknown
Source)
at
org.apache.ojb.broker.accesslayer.IndirectionHandler.materializeSubject(Unknown
Source)
at
org.apache.ojb.broker.accesslayer.IndirectionHandler.getRealSubject(Unknown
Source)
at org.apache.ojb.broker.VirtualProxy.getRealSubject(Unknown
Source)
at
com.tk20.bo.BaseServerObjectProxy.realSubject(BaseServerObjectProxy.java:46)
at
com.tk20.bo.BaseServerObjectProxy.getRelatedObjects(BaseServerObjectProxy.java:334)
at
com.tk20.ejb.api.query.QueryMgrEJB.getList(QueryMgrEJB.java:83)
2)java.lang.OutOfMemoryError
rethrown as
org.apache.ojb.broker.PersistenceBrokerException
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollection(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollections(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getExtentDBObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByIdentity(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getReferencedObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveReference(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveReferences(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getExtentDBObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByIdentity(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getReferencedObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveReference(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveReferences(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getExtentDBObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByIdentity(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getReferencedObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveReference(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveReferences(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByIdentity(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByQuery(Unknown
Source)
at
org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByQuery(Unknown
Source)
at
org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByQuery(Unknown
Source)
at
com.tk20.ejb.api.BaseServiceEJB.findByPrimaryKey(BaseServiceEJB.java:189)
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