Now my application rising following error sometime and sometime working
perfect, anyone of you ever faced such error?
Caused by:
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No
operations allowed after statement closed.
at
sun.reflect.GeneratedConstructorAccessor157.newInstance(Unknown Source)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at
java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
at com.mysql.jdbc.Util.getInstance(Util.java:381)
at
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:984)
at
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
at
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:926)
at
com.mysql.jdbc.StatementImpl.checkClosed(StatementImpl.java:405)
at
com.mysql.jdbc.PreparedStatement.setInternal(PreparedStatement.java:3659)
at
com.mysql.jdbc.PreparedStatement.setInt(PreparedStatement.java:3616)
at
org.apache.commons.dbcp.DelegatingPreparedStatement.setInt(DelegatingPreparedStatement.java:117)
at
org.apache.commons.dbcp.DelegatingPreparedStatement.setInt(DelegatingPreparedStatement.java:117)
at org.hibernate.type.IntegerType.set(IntegerType.java:64)
at
org.hibernate.type.NullableType.nullSafeSet(NullableType.java:154)
at
org.hibernate.type.NullableType.nullSafeSet(NullableType.java:136)
at
org.hibernate.loader.Loader.bindPositionalParameters(Loader.java:1732)
at
org.hibernate.loader.Loader.bindParameterValues(Loader.java:1703)
at
org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1593)
at org.hibernate.loader.Loader.doQuery(Loader.java:696)
at
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
at
org.hibernate.loader.Loader.loadCollection(Loader.java:2019)
... 45 more
(I'm just to tired to Google this issue therefore posted here. Good Night)
On Wed, Jan 26, 2011 at 5:24 PM, Mark Shifman <mark.shif...@yale.edu> wrote:
> You may want to look at what connections your database thinks are open.
> In Oracle, from a sql plus command line:
>
> select username, program, machine, osuser, logon_time, sid, serial#
> from v$session where osuser != 'oracle' order by machine, logon_time;
>
> You can also do something similar with mysql but I don't remember the
> sql. I suspect all databases have some way to tell which connections
> are open.
>
> You can also watch the number of open connections grow if you haven't
> appropriately closed the connections.
>
> mas
>
>
>
> On 01/25/2011 08:05 PM, Phil Steitz wrote:
> > On Tue, Jan 25, 2011 at 4:39 PM, Suny kk <suny...@gmail.com> wrote:
> >> Hi Phil,
> >>
> >> Yes, I'm using BasiDataSource well, Is it because of my DBCP settings?
> >> Remember I got this exception when I started my application on different
> >> machine with same database.
> >>
> >
> > Well, if the first instance starts and uses the full 500 max
> > connections, then that could explain why the second instance cannot
> > get any connections from the database (assuming the database itself
> > cannot handle more than 500 connections).
> >
> > As I said below, the error that you are getting means that when the
> > application starts the database does not have connections available to
> > provide to the pool. You should check and confirm:
> >
> > 0) Is the application closing all connections that it opens? You can
> > quickly max the pool connections if your code does not return
> > connections to the pool. Your configuration allows 500 connections to
> > be opened by the pool concurrently. You should observe the actual
> > database engine connection counts and see if your app is getting near
> > the max. Given that you have maxIdle set at 8, if you are hitting
> > high connection count numbers either you have some very long-running
> > queries and large load spikes, or your code is abandoning connections
> > (not closing them).
> >
> > 1) Are other applications or processes consuming available database
> connections?
> >
> > Phil
> >
> > ---------------------------------------------------------------------
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> >
>
> --
> Mark Shifman MD. Ph.D.
> Yale Center for Medical Informatics
> Phone (203)737-5219
> mark.shif...@yale.edu
>
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>
>
