Filippo Bosi wrote:
>
> >Date: Tue, 20 Mar 2001 11:30:10 +0100
> >To: [EMAIL PROTECTED]
> >From: Filippo Bosi <[EMAIL PROTECTED]>
> >Subject: Jonas 2.2.6 bug report (ConcurrentModificationException in Pool.java)
> >Cc: [EMAIL PROTECTED], [EMAIL PROTECTED]
> >
> >Jonas 2.2.6 Bug Report:
> >
> >Under stress (>15 threads) using only Session Beans, each using db
> >operations (therefore, doing
> >lots of get() and close() with datasources), with tracing options in
> >Trace.level<>31 (none) we
> >get the following error.
Hi Filippo,
Thank you for reporting this bug.
Are you sure that you have no trace level other than 31 ????
Because the dump() function is only called if level 11 is set!
Philippe
> >
> >16:01:45:911 - java.util.ConcurrentModificationException
> > at
> > java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:535)
> > at java.util.LinkedList$ListItr.next(LinkedList.java:476)
> > at org.objectweb.jonas.dbm.Pool.dump(Pool.java, Compiled Code)
> > at org.objectweb.jonas.dbm.Pool.closeConnection(Pool.java:298)
> > at
> >
>org.objectweb.jonas.dbm.ConnectionManager.connectionClosed(ConnectionManager.java:439)
> > at
> > org.objectweb.jonas.jdbc_xa.XAConnectionImpl.notifyClose(XAConnectionImpl.java,
> > Compiled Code)
> > at
> > org.objectweb.jonas.jdbc_xa.ConnectionImpl.close(ConnectionImpl.java:197)
> > at
> >
>it.sai.anag.mw.host.caricastrutture.CaricaStrutturaDBEjb.caricaStruttura(CaricaStrutturaDBEjb.java:127)
> > at
> > it.sai.anag.mw.host.StruttureHost.caricaStruttura(StruttureHost.java,
> > Compiled Code)
> > at
> > it.sai.anag.mw.host.StruttureHost.getStruttura(StruttureHost.java:65)
> > at
> > it.sai.anag.mw.host.StringaDatiHost.<init>(StringaDatiHost.java:49)
> > at it.sai.anag.mw.host.ProxyHost.insPersona(ProxyHost.java:192)
> > at
> > it.sai.anag.od.InserimentoPersona.esegui(InserimentoPersona.java:139)
> > at it.sai.anag.od.Anag.insPersona(Anag.java:98)
> > at
> > it.sai.anag.mw.ejb.AnagraficaBean.insPersona(AnagraficaBean.java:217)
> > at
> > it.sai.anag.mw.ejb.JOnASanagraficaRemote.insPersona(JOnASanagraficaRemote.java:56)
> > at
> >
>it.sai.anag.mw.ejb.JOnASanagraficaRemote_Skel.dispatch(JOnASanagraficaRemote_Skel.java,
> > Compiled Code)
> > at
> > sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java,
> > Compiled Code)
> > at
> > sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java, Compiled Code)
> > at sun.rmi.transport.Transport$1.run(Transport.java, Compiled Code)
> > at java.security.AccessController.doPrivileged(Native Method)
> > at sun.rmi.transport.Transport.serviceCall(Transport.java,
> > Compiled Code)
> > at
> > sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:422)
> > at
> > sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:634)
> > at java.lang.Thread.run(Thread.java, Compiled Code)
> >
> >The reason of the error lies in Pool.java (org.objectweb.jonas.dbm.Pool
> >class implementation),
> >precisely in the dump() function. That function "dumps" to log the whole
> >connection list. The
> >iteration on the list, though, is not synchronized with other operations
> >on the connection list.
> >So the dump operation fails if any other thread in the application server
> >modifies the connection
> >list.
> >
> >Regards,
> >Filippo
>
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--
Philippe Durieux ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Bull - 1 rue de Provence - 38432 Echirolles Cedex France
[EMAIL PROTECTED]
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