Forgot to mention that we are using ojb1.0rc4 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. It happens only if a > lot of users around 200 are using the system. 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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