Java.io.IOException:Data has already been flushed to the client

hi,
will u please anyone tell about this exception? its very urgent to me?
i am getting exception when i ma forwarding a page in jsp.
exception is :
java.io.IOException : Data has already been flushed to the client.
my code where i am getting this exception is:
if(filled_var .equalsIgnoreCase("y"))
%>
<jsp:forward page="/editForm.jsp">
<jsp:param name="formNum" value="<%= formNum%>"/>
</jsp:forward>
<%
here i am getting that error. please help me to find a solution in this.

A forward can only be performed if the "response is not committed". The response is committed when:
1) you do a forward
2) enough data is outputted for the buffer to be flushed
3) you flush the buffer manually (or you do an include with a flush="true" for example)
It must be either 2 or 3 in the case of a JSP. So if you output a lot of data before the forward, make sure you try to do the forward BEFORE you output all that data.

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Can anyone tell me what kind of problem and where and
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>
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809364 wrote:
You can apply the below debug flags to check t he RJVM Communication in detail and figure out what's going wrong and do apply it at both the side
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{}>
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{}>
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<Nov 6, 2012 11:41:17 AM EET> <Debug> <RJVM> <BEA-000500> <Signaling peer: '-3712802650201056847S:10.160.1.40:[7001,-1,-1,-1,-1,-1,-1]:fcj_domain:ManagedServer1' gone - weblogic.rjvm.PeerGoneException: ; nested exception is:
 java.io.EOFException>
<Nov 6, 2012 11:41:17 AM EET> <Debug> <RJVM> <BEA-000500> <Closed and removed: 't3' connection to: '-3712802650201056847S:10.160.1.40:[7001,-1,-1,-1,-1,-1,-1]:fcj_domain:ManagedServer1'. Connections list size 0>
<Nov 6, 2012 11:41:17 AM EET> <Debug> <RJVM> <BEA-000500> <Closing: '-3712802650201056847S:10.160.1.40:[7001,-1,-1,-1,-1,-1,-1]:fcj_domain:ManagedServer1'>
<Nov 6, 2012 11:41:17 AM EET> <Warning> <EJB> <BEA-010061> <The Message-Driven EJB: ClonedQueueAnonymousWaiter is unable to connect to the JMS destination: MDB_QUEUE_RESPONSE. The Error was:
javax.naming.CommunicationException [Root exception is weblogic.rjvm.PeerGoneException: ; nested exception is:
 java.io.EOFException]
 at weblogic.jndi.internal.ExceptionTranslator.toNamingException(ExceptionTranslator.java:74)
 at weblogic.jndi.internal.WLContextImpl.translateException(WLContextImpl.java:470)
 at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.java:426)
 at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.java:411)
 at javax.naming.InitialContext.lookup(InitialContext.java:392)
 at weblogic.deployment.jms.ForeignOpaqueReference.getReferent(ForeignOpaqueReference.java:221)
 at weblogic.jndi.internal.WLNamingManager.getObjectInstance(WLNamingManager.java:96)
 at weblogic.jndi.internal.ServerNamingNode.resolveObject(ServerNamingNode.java:377)
 at weblogic.jndi.internal.BasicNamingNode.resolveObject(BasicNamingNode.java:856)
 at weblogic.jndi.internal.BasicNamingNode.lookup(BasicNamingNode.java:209)
 at weblogic.jndi.internal.WLEventContextImpl.lookup(WLEventContextImpl.java:254)
 at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.java:411)
 at javax.naming.InitialContext.lookup(InitialContext.java:392)
 at weblogic.jms.common.CDS$2.run(CDS.java:486)
 at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:363)
 at weblogic.jms.common.CrossDomainSecurityManager.runAs(CrossDomainSecurityManager.java:131)
 at weblogic.jms.common.CDS.lookupDestination(CDS.java:480)
 at weblogic.jms.common.CDS.lookupDDAndCalloutListener(CDS.java:345)
 at weblogic.jms.common.CDS.access$100(CDS.java:41)
 at weblogic.jms.common.CDS$DDListenerRegistrationTimerListener.timerExpired(CDS.java:193)
 at weblogic.timers.internal.TimerImpl.run(TimerImpl.java:273)
 at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:528)
 at weblogic.work.ExecuteThread.execute(ExecuteThread.java:207)
 at weblogic.work.ExecuteThread.run(ExecuteThread.java:176)
Caused by: weblogic.rjvm.PeerGoneException: ; nested exception is:
 java.io.EOFException
 at weblogic.rjvm.ResponseImpl.unmarshalReturn(ResponseImpl.java:234)
 at weblogic.rmi.cluster.ClusterableRemoteRef.invoke(ClusterableRemoteRef.java:348)
 at weblogic.rmi.cluster.ClusterableRemoteRef.invoke(ClusterableRemoteRef.java:259)
 at weblogic.jndi.internal.ServerNamingNode_1034_WLStub.lookup(Unknown Source)
 at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.java:423)
 ... 21 more
Caused by: java.io.EOFException
 at weblogic.rjvm.t3.MuxableSocketT3.endOfStream(MuxableSocketT3.java:345)
 at weblogic.socket.SocketMuxer.deliverExceptionAndCleanup(SocketMuxer.java:826)
 at weblogic.socket.SocketMuxer.deliverEndOfStream(SocketMuxer.java:760)
 at weblogic.socket.SocketMuxer.readReadySocketOnce(SocketMuxer.java:941)
 at weblogic.socket.SocketMuxer.readReadySocket(SocketMuxer.java:898)
 at weblogic.socket.DevPollSocketMuxer.processSockets(DevPollSocketMuxer.java:126)
 at weblogic.socket.SocketReaderRequest.run(SocketReaderRequest.java:29)
 at weblogic.socket.SocketReaderRequest.execute(SocketReaderRequest.java:42)
 at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:145)
 at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:117)
>
Seems like Peer gone exception is the root cause of this. Any idea for this ?
Regards,
Priyam
Edited by: Priyam Srivastava on Nov 6, 2012 2:49 AM

'Connection has already been closed'. Random error connecting with a pool

Hi all,
I've got a problem I cannot solve, and really hope in someone's help...
The fact is: I'm working on a webapp which doesn't made use of frameworks or patterns or similars. I introduced the DAO pattern in order to organize and speed up the work. At the core of the new classes there is the DBDAO, and this is the way it obtains the connection:
 protected Connection conn = null; ... protected Connection getConnection() { try { if (conn == null || conn.isClosed()) { Context ctx = new InitialContext(); javax.sql.DataSource ds=null; ds =(javax.sql.DataSource) ctx.lookup( "agespPool" ); conn = ds.getConnection(); conn.setAutoCommit(false); } } catch (Exception ne) ...
Every new class that needs to access the db extends DBDAO and retrieves the conn with this method. In order to make things work without changing all the code, I modified the old class named 'Connessione' and made it extend DBDAO. Here is its method:
 public class Connessione extends DBDAO{ ... public static synchronized Connection getConnessione() throws Exception { return new Connessione().getConnection(); }
That's all. Finished with the code.
Now, if someone uses the new classes extending DBDAO, all goes well. But for some old function that still work with Connessione.getConnessione(), connection closes suddenly with no reason.
For example, calling a page with some combo box populated with a db connection, you catch a:
 java.sql.SQLException: Connection has already been closed. at weblogic.jdbc.wrapper.PoolConnection.checkConnection(PoolConnection.java:63) at weblogic.jdbc.wrapper.ResultSetMetaData.preInvocationHandler(ResultSetMetaData.java:37) at weblogic.jdbc.wrapper.ResultSetMetaData_oracle_jdbc_driver_OracleResultSetMetaData.getColumnType(Unknown Source) at it.praxis.tim.agesp.pub.sql.PagingList.populate(PagingList.java:98) at it.praxis.tim.agesp.pub.sql.PagingList.executeSQL(PagingList.java:53) at jsp_servlet._jsp._todolist_new._richiesta.__listarichieste._jspService(__listarichieste.java:353) at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)
or sometimes:
 - 20080417141147: <E> HtmlSelect.createHtmlSelect(4) - Errore! java.sql.SQLException: Result set already closed - 20080417141147: <E> HtmlSelect.createHtmlSelect(7) - Errore! java.sql.SQLException: Connection has already been closed. - 20080417141147: <E> ERRORE: ricercaRichieste : java.sql.SQLException: Statement has already been closed
That is, the conn is closed while used to populate the combo box. I don't understand who closes it.
Moreover, that happens randomly: 1 or 2 times over 4 hits on the page. The other times, all goes well. Most of the other pages, all goes well. So I don't think I have to search for a bug in the code.
Now, I'm working with BEA WL 8.1 sp 5 and Oracle 9.2.0.1.0 .
The error turns out even if I work locally (with Tomcat 5.5.23).
The webapp made use of a custom driver beforehand, and I replaced it with oracle's driver.
I tried to set the Connection Pool with oracle.jdbc.driver.OracleDriver and oracle.jdbc.OracleDriver .
I left the default for the connection pool, and then tried to set (BEA):
Connection Reserve Timeout: -1
Test Created Connections: On
with no changes.
The connection suddenly and randomly closes.
Any help would be appreciated...
Many thanks

the thing that you are instantiating isn't a Connection object, it's a Connessione object. That's returning one that's either been stashed from a previous call, or
acquires one from the data sourcea new Connessione object means a call to getConnection that means a new Connection object. That code is synchronized, it has to be a new object.
It is entirely possible that conn is not null if other actions have taken place in your constructor. Even assuming it is null, we don't know anything about the
connection pool you're trying to use, though it looks like it's probably weblogic's one.The contructor doesn't know of the connection. As for the pool, it is weblogic's one.
And even assuming both of these cases, we have no particular reason to believe that you're calling the getConnessione() method instead of accidentally calling
getConnection() and thus no reason to believe that you're definitely carrying out the actions that you believe you're carrying out.I wrote that the problem comes out in the old code that once worked fine. That code only uses Connessione.getConnessione() .
Conversely we have an error message that says you're closing connections elsewhere. Clearly there's a bug. It's presumably in your assumptions. You're
arguing instead of checking them.If I have a wrapper logging the close() calls, I have to see every call logged. Even if there's a bug (but remember that the code worked fine with a previous custom datasource), why do you think I shouldn't see that close() logged?
I may be wrong, but I already searched in that code. I'm arguing after all the checks.
There is no other thread that can see that connHow do you know? I have that Connessione.getConnessione() in a jsp. It's synchronized. That gives a new connection. I see it passed only to an utility class that queries the db and reads the resultset.
Who do you think can access that connection?

Java.io.IOException:Data has already been flushed to the client

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