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Re: [eclipselink-users] Troubles with Network error.
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> The JDBC timeout is just passed to the JDBC driver. If your JDBC driver
> does not support the timeout, or does not handle a network failure, there
> is nothing EclipseLink can do.
>
> You may wish to log this issue with your JDBC driver, or try a different
> driver.
>
Well, that was the problem. The Derby client have a Bug when the server is
disconnected from the network. Everything hangs.
Thanks for the help.
> Arcangel wrote:
> > Hi,
> >
> > I'm having some troubles with a application when I have a network
> > connection
> > error. I expected some type of exception when eclipselink cannot get the
> > result of some query, instead the application blocks forever.
> >
> > I tried with the query hint:
> > @QueryHint(name=QueryHints.JDBC_TIMEOUT, value="10")
> >
> > And with:
> > <property name="eclipselink.jdbc.timeout" value="10"/>
> >
> > This is the code of the function that blocks the app (only relevant
> > parts):
> >
> > @NamedQuery(name = "getAllDateNoDuplicadas",
> > query = "SELECT e From Solicitud e WHERE e.status = true AND
> > e.fechaAlta >=
> >
> > :fecha_inicio " +
> >
> > "AND e.fechaAlta <= :fecha_fin AND e.estadoExportacion <>
> > com.nettrace.ilm.enums.EstadoExportacion.DUPLICADA",
> > hints={
> > @QueryHint(name=QueryHints.JDBC_FETCH_SIZE , value="256"),
> > @QueryHint(name=QueryHints.READ_ONLY, value=HintValues.TRUE),
> > @QueryHint(name=QueryHints.REFRESH , value=HintValues.TRUE),
> > @QueryHint(name=QueryHints.READ_ONLY, value=HintValues.TRUE),
> > @QueryHint(name=QueryHints.CACHE_USAGE,
> > value=CacheUsage.DoNotCheckCache),
> > @QueryHint(name=QueryHints.JDBC_TIMEOUT, value="10")
> > }
> > .....
> >
> > @SuppressWarnings("unchecked")
> > public static final List<Solicitud> getAllNoDuplicadas(Date
> > fecha_inicio, Date fecha_fin) {
> > if (LOGGER.isLoggable(Level.FINE)) {
> > LOGGER.logp(Level.FINE, "Model", "getAllNoDuplicadas(Date, Date)",
> > "start");
> > }
> > EntityManager em = null;
> > try {
> > em = factory.createEntityManager();
> > System.out.println("1");
> > Query q = em.createNamedQuery("getAllDateNoDuplicadas");
> > System.out.println("2");
> > q.setParameter("fecha_inicio", fecha_inicio);
> > q.setParameter("fecha_fin", fecha_fin);
> > List<Solicitud> res;
> >
> > res = new ArrayList<Solicitud>(q.getResultList()); //Here the codec
> > blocks.
> > System.out.println("3");
> >
> > if (LOGGER.isLoggable(Level.FINE)) {
> > LOGGER.logp(Level.FINE, "Model", "getAllNoDuplicadas(Date, Date)",
> > "end");
> > }
> > return res;
> >
> > }
> > catch (Exception e) {
> > LOGGER.logp(Level.SEVERE, "Model", "getAllNoDuplicadas(Date, Date)",
> > "",
> > e);
> >
> > if (LOGGER.isLoggable(Level.FINE)) {
> > LOGGER.logp(Level.FINE, "Model", "getAllNoDuplicadas(Date, Date)",
> > "end");
> > }
> > return null;
> > }
> > finally{
> > if(em != null){
> > em.close();
> > }
> > }
> > }
> >
> > What is the proper way to deal with a Network disconnection Error?
> >
> > To test this behavior i'm using a Virtual machine (VMware Player 3.0.0 on
> > kubuntu linux 9.04) to disconnect the network device (sudo ifdown eth0)
> > in
> > the middle of using the app. The Vm host the derby DB server.
> >
> > I'm using derby 10.5.3._01 with client driver of the same version. I
> > tested
> > eclipselink 1.1.3 and 2.0.0. The problem is the same.
> >
> > Thanks for the help.
> >
> > _______________________________________________
> > eclipselink-users mailing list
> > eclipselink-users@xxxxxxxxxxx
> > https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>
> -----
> http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland
> http://www.eclipse.org/eclipselink/
> EclipseLink , http://www.oracle.com/technology/products/ias/toplink/
> TopLink
> Wiki: http://wiki.eclipse.org/EclipseLink EclipseLink ,
> http://wiki.oracle.com/page/TopLink TopLink
> Forums: http://forums.oracle.com/forums/forum.jspa?forumID=48 TopLink ,
> http://www.nabble.com/EclipseLink-f26430.html EclipseLink
> Book: http://en.wikibooks.org/wiki/Java_Persistence Java Persistence
>
