Weißböck Maximilian wrote:
>
> We have a mayor memory Problem regarding Jonas.
>
> In a real live test we tried to create about 100.000
> records in our database using a session bean that
> creates entity beans.
>
> At about 69.000 records we got the following error:
>
> ----
>
> System Exception in business method:java.lang.OutOfMemoryError
> ClientSocket: 172.16.100.115:4711
> ClientSocket: 172.16.100.115:3889
> Failed to close the PreparedStatement (findByPrimaryKey)
> java.sql.SQLException: Protokollverletzung
> at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:114)
> at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:156)
> at oracle.jdbc.dbaccess.DBError.check_error(DBError.java:803)
> at oracle.jdbc.ttc7.Oclose.receive(Oclose.java:130)
> at oracle.jdbc.ttc7.TTC7Protocol.close(TTC7Protocol.java:512)
> at
> oracle.jdbc.driver.OracleStatement.close(OracleStatement.java:467)
> at
> oracle.jdbc.driver.OraclePreparedStatement.close(OraclePreparedStatem
> ent.java:257)
> at
> at.intellinet.igel.commerzplus.eb.JOnASKontoBean.ejbFindByPrimaryKey(
> classes\at\intellinet\igel\commerzplus\eb\JOnASKontoBean.java:464)
> at
> at.intellinet.igel.commerzplus.eb.JOnASKontoHome.findByPrimaryKey(cla
> sses\at\intellinet\igel\commerzplus\eb\JOnASKontoHome.java:142)
> at
> at.intellinet.igel.commerzplus.eb.JOnASKontoHome_Skel.dispatch(classe
> s\at\intellinet\igel\commerzplus\eb\JOnASKontoHome_Skel.java:69)
> at
> sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:319
> )
> at
> sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:187)
> at sun.rmi.transport.Transport$1.run(Transport.java:142)
> at java.security.AccessController.doPrivileged(Native Method)
> at sun.rmi.transport.Transport.serviceCall(Transport.java:139)
> at
> sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:4
> 43)
> at
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport
> .java:643)
> at java.lang.Thread.run(Thread.java:484)
> postinvoke: System Exception in a home method:java.lang.OutOfMemoryError
> System Exception in business method:java.rmi.ServerException:
> RemoteException o
> ccurred in server thread; nested exception is:
> java.rmi.RemoteException: Error thrown by an enterprise Bean; nested
> exc
> eption is:
> java.lang.OutOfMemoryError
>
> ------
>
> Does this mean that Jonas keeps all the beans it generats
> in memory? Does it never free any resources?
>
> This is really a big problem to us, as we must handle at least
> about 100.000 new records per day!
>
> So does this mean we can not use Jonas???
>
> Thanks, Max
> ---
> Dipl.-Ing. Maximilian Weißböck
> i-online Software AG
> Tel.: +43 2236 3080 3785
> Handy: 0699 1888 3785
> Fax: +43 2236 3080 24 3785
> mailto:[EMAIL PROTECTED]
> http://www.i-online.cc
JOnAS does not keep all beans in memory. If you use RMI, the distributed
garbage collector will inform jonas when beans are no more used, and JOnAS
can dispose of them. In fact, they are put in a pool of available objects.
THis is not perfect, because the garbage collector run only every x? seconds
or minutes... Meanwhile, you can saturate the memory.
We are currently working to improve jonas scalability, for session stateful
beans in particular. The coming jonas 2.3 should be more scalable than jonas 2.2
If you use JEREMIE instead of RMI, I'm afraid this garbage collector doesn't
work. You will have to wait for a next version of Jeremie if scalability is
a mojor concern for you.
We know that scalability in JOnAS is one of our most important concerns, and
we are working on it.
>
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--
Philippe Durieux ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Bull - 1 rue de Provence - 38432 Echirolles Cedex France
[EMAIL PROTECTED]
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