Socket reader problem even if Native IO is enabled

Hi,
I am using weblogic 6.1 sp1 on a hp windows2000 quad box. weblogic server hosts
all the ejbs. Resin is used as a servlet engine. Sometimes the message
<Sep 10, 2001 8:35:01 PM CDT> <Warning> <JavaSocketMuxer> <There are: '3' active
sockets, but the maximum number of socket readers allowed by theconfiguration
is: '2', you may want alter your configuration.>
is seen in resin log.
I thought this should not happen if NativeIO is enabled. I am sure nativeIO is
enabled because when weblogic startup , I am able to see the PerformancPack tag.
thanks
arock

This is a client-side configuration. You can increase WLS thread pool size by
setting these 2 system properties (if I remember their names correctly):
weblogic.ThreadPoolSize=10
weblogic.ThreadPoolPercentSocketReaders=60
on the client side.
arock <[email protected]> wrote:
Hi,
I am using weblogic 6.1 sp1 on a hp windows2000 quad box. weblogic server hosts
all the ejbs. Resin is used as a servlet engine. Sometimes the message
<Sep 10, 2001 8:35:01 PM CDT> <Warning> <JavaSocketMuxer> <There are: '3' active
sockets, but the maximum number of socket readers allowed by theconfiguration
is: '2', you may want alter your configuration.>
is seen in resin log.
I thought this should not happen if NativeIO is enabled. I am sure nativeIO is
enabled because when weblogic startup , I am able to see the PerformancPack tag.
thanks
arock--
Dimitri

Similar Messages

TCP Socket Reading Problem-

Hi,
I am reading a response from the Socket by using InputStream and BufferedReader object. Reading it byte by byte. But as my response data ( bytes) is very large (6000- 7000 bytes). The reading time is almost 5-6 minutes.
As i dont know the socket inputstreams size ( no of bytes) i can't use readFully() method of DataInputStream becoz byte array size is to be specified . If the array size > reponse size, it throws EOF exception,
So my problem is that reading the response should be fast . Can you please tell any way of reading the response fast or knowing the socket inputstreams size in prior before reading it .
Awaiting your reply,
Regards,
Prakash.

balramprakash wrote:
Hi,
I am reading a response from the Socket by using InputStream and BufferedReader object. Reading it byte by byte. BufferedReaders read text (16-bit char) not bytes.
But as my response data ( bytes) is very large (6000- 7000 bytes). This isn't very large unless you network is very slow. Even with 1 Mb broadband this would take 0.07 seconds to download. On a dial modem it would take 1.5 second.
The reading time is almost 5-6 minutes. You have a serious problem with your setup. Even reading one character at a time (which is the slowest way to do this) it shouldn't take anywhere near that long.
Perhaps you don't know when the response ends so you ware waiting for a disconnect or the connection to timeout.
As i dont know the socket inputstreams size ( no of bytes) i can't use readFully() method of DataInputStream becoz byte array size is to be specified If you can change the format, you can send the size before you send the data and the reader know how much data to expect.
So my problem is that reading the response should be fastSend the size with the response. Don't use BufferedReader if you have binary data. (e.g. byte data) It it should take about 7 ms to load on a 10 Mb connection.
BTW: if you are opening a new connection each time it can take about 20 ms to establish, so the time to download the response is small in this case.

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UDPClient socket.receive() problem

I have a slight problem.... while receiving the packets.....
          /*** DECLARE AND INSTANCIATE DATAGRAM TO RECEIVE ***/
          /* buffer for holding the incoming datagram*/
          byte[] buffer = new byte[size];
          DatagramPacket reply[] = new DatagramPacket[size];
               start = System.currentTimeMillis();
                                         /*** SEND DATAGRAM PACKETS (THIS SECTION WORKS FINE)***/
          for(counter = 0; counter < size; counter++)
           request[counter] = new DatagramPacket(m, m.length, aHost, serverPort);
           aSocket.send(request[counter]);
          System.out.println("Sent all");
          /*** RECEIVE DATAGRAM PACKETS (   PROBLEM SECTION   )***/
          for (Getcount = 0; Getcount < size ; Getcount++)
               System.out.println("Receving " +Getcount);
               reply[Getcount] = new DatagramPacket(buffer, buffer.length);
               System.out.println("got pack in array");
SPECIFICALLY PROBLEM IS HERE >>>>aSocket.receive(reply);
HOW DO I receive the package?
I cannot try to recieve individual because I doono which one is going to show up first... so I cant put in a lopp saying that aSocket.receive(reply[Getcount]); also I cannot get it using aSocket.receive(reply);
because the receieve needs a datagram packet.....
               System.out.println("Received by socket");
          end = System.currentTimeMillis();
          difference = end - start;
          System.out.println("Reply: " + new String(reply[0].getData()));
          System.out.println("Difference in time was "+difference+" milliseconds");

I am setting the size as 100 in the arg[0] but the problem is that
import java.net.*;
import java.io.*;
import java.text.*;
import java.util.*;
public class UDPClientTest
     public static void main(String args[])
          DatagramSocket aSocket = null;
       try
          aSocket = new DatagramSocket();
          InetAddress aHost = InetAddress.getByName(args[1]);
          int serverPort = 6789;
          int counter;
          int Getcount;
          /*** SET ARRAY SIZE FROM COMMAND PROMPT ***/
          int size = Integer.parseInt(args[0]);
          byte[] m = new byte[size];
          /*** FILL ARRAY WITH RANDOM NUMBERS ***/
          for(int count = 0; count < size; count ++)
               m[count] = (byte)(Math.random()*1000);
          /*** INITIALIZE EVERYTHING HERE (BEFORE TIMER STARTS COUNTING TIME) ***/
          /*** DECLARE AND INSTANCIATE DATAGRAM TO SEND ***/
          DatagramPacket request[] = new DatagramPacket[size];
          /*** DECLARE AND INSTANCIATE DATAGRAM TO RECEIVE ***/
          /* buffer for holding the incoming datagram*/
          byte[] buffer = new byte[10000];
          DatagramPacket reply = new DatagramPacket(buffer,buffer.length);
          /*** VARIABLES FOR TIMERS ***/
          long start = 0, end = 0, difference = 0;
          /*** START TIMER (USING SYSTEM TIMER NOT DATE OBJECT FOR MORE ACCURACY)***/
          start = System.currentTimeMillis();
          /*** SEND DATAGRAM PACKETS ***/
          for(counter = 0; counter < size; counter++)
           request[counter] = new DatagramPacket(m, m.length, aHost, serverPort);
           aSocket.send(request[counter]);
          System.out.println("Sent all");
          /*** RECEIVE DATAGRAM PACKETS ***/
               >>>>>>>>>PROBLEM BELOW<<<<<<<<<<<<<<<
          aSocket.setSoTimeout(1000000000);
/****PROBLEM: EVEN THOUGH I HAVE SIZE WHICH IS 100 when I start program in arg[0] the program just starts from 99 but stops at 17 and prints what I have displayed after code and waits ****/
          while(--size >= 0)
               reply = new DatagramPacket(buffer,buffer.length);
          try{
               System.out.println(size);
               aSocket.receive(reply);
               System.out.println("After receive");
          } catch(SocketException e){System.out.println("Socket Exception "+e.getMessage());}
          /*** END TIMER ***/
          end = System.currentTimeMillis();
          difference = end - start;
          System.out.println("Reply: " + new String(reply.getData()));
          System.out.println("Difference in time was "+difference+" milliseconds");
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          catch (IOException e){System.out.println("IO: " + e.getMessage());}
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}.........STARTS WITH 99 and prints this below
After receive
27
After receive
26
After receive
25
After receive
24
After receive
23
After receive
22
After receive
21
After receive
20
After receive
19
After receive
18
After receive
17
then it justs waits............
Please help me.........

Socket read error: connection reset by peer

Hi.
Has anybody experienced the error message �Socket read error: connection reset by peer�
Please see below for detailed information.
Appreciate your help
Regards
RT
Enviroment specification
Server: HP/UX 11.00 64-bit, Oracle RDBMS 8.1.6.0.0 64-bit
2 firewalls between client and db.
Client:
Win 2000,
SP3,
Oracle Client 8.1.7.0.0 ,JDBC OCI (thin JDBC driver,class12.zip)
JDK 1.3
JRUN3.0
The TCP protocol is being used in the communication
Error messages
Web Users receive: Socket read error: connection reset by peer
Trace files on the sever: Read unexpected EOF ERROR on 18.
Explanation: The error in the server sqlnet trace file, suggests that a client connection has terminated abnormally, i.e. client machine powered off, a cable removed or a network connection aborted without warning. No user has complained of such a problem and there is no client trace with an error.
The problem
The users of the java web application, experiencing an exception almost once or twice a day.
The JRUN web-server reports broken connections to the db and client are receiving "connection reset by peer".
At the moment when the errors occurs the users just have to wait a while(2-10 min) and then they can use the web application again.(no action is taken)
This problem can not be reproduced. The problem happens only occasionally when the network is under heavy load and new DB connection is being created.
The application
The java web-application uses a customized connection pooling against the database. This pool is shared among all the users of the website. whenever a user process needs to fetch data from the database, a free connection from this pool is allocated. The application is testing if the connection is valid before making a transaction (select '1' from dual). When the error occurs a ORA-3113 end-of-file on communication channel is returned to the application.
The path between the client and db involves at least two firewalls. The firewalls are opened for sql*net traffic. The network group can tell that enquiries from the app.server is not getting feedback from the db. They have not however, identified if the enquiries are reaching the db-srever, or if they are stopped earlier in the network.
Around 1000 users, are using other applications which uses dedicated sqlnet connections against the db and they have not experienced any problems.
Issues considered
Connection pooling
It is a customized connection pooling, developed by Lindorff developers.
I have read through the source code for the connection pooling and it does the job as it should, and in case of bad connection, it tries to create a new connection.
The log file shows that the call to the method DriverManager.getConnection() hangs until the server goes down, which is probably because of the fact that the method DriverManager.setLoginTimeout(), does not take effect and timeout value is Zero. ( According to oracle , Oracle JDBC does not support login timeouts and calling the static DriverManager.setLoginTimeout() method will have no effect).
Firewall
One thing to consider is when the firewall may decide to shut down the socket due to long inactivity of a connection. This will cause problems to JDBC Connection Pool because the pool is not aware of this disconnection at the TCP/IP level; until someone checks out the connection from the pool and tries to use it. The user will get a Socket read error: connection reset by peer.
Jrun timeout paramter is less than the firewall�s timeout so the firewall will not close a connection before Jrun does.
Number of processes the DB can handle
Processes parameter is 1300, , they have not experienced the Oracle error msg �max # of processes reached�.
Port redirection through a firewall:
Since the firewall has a sql net proxy Port redirection through a firewall is not a problem. Problems with port redirection only appear at connect time, but in this situation the connections fail long after the connection is established.
The network group
The network people who investigaged the problem at Lindorff report that there are a significant amount of "dropped packages" between the database server and the jdbc client (web-application) 24 hrs. The reason for this is "unknown established TCP packet" which means that the firewall does not consider these packages to be part of an already established session. The network group believes this happen because one of the hosts send a RESET or FIN signal which the firewall have noticed but are not received by the other host.
It seems like the firewall are dropping packages bacause of "Unknown
established TCP packet" from both the JDBC client and the TNSLISTENER on the database server. The dropped packages are SQL*Net v2 traffic so clearly Oracle products are involved

Presumably something is working.
Thus the problem is not with your code. At least not the database part that you have control over.
That error occurs when the other side closes the socket. Presumably you are catching lost connection exceptions and trying to restore it.

I desperately need to solve this problem even geeks on call could not

I desperately need to solve this problem
Posted: May 17, 2006 5:29 PM Reply Email
How to Connecti computers over the internet using IP addresses
Posted: Mar 8, 2006 7:18 PM
Reply Email
No one has been able to help me solve this problem even geeks on call
So please out there give me some good advice. This feels like a level 5
I have three computers at three different locations. The first one is a emac at my office running classic 9.2. The second location is a power book g4 running 10.4.5. at my home. The third is a power book g3 running OS 9.2.2at a third location.
What I am trying to do is to access my computer at my office from the other two locations. My office has two computers that are on a network and talk to each other. They are both EMAC"S. They are connected by a ethernet network which is connected to a DSL modem which keeps me on the Internet all the time.
At the other two locations I have direcway satellite which is broadband which also stays on all the time on the internet.
I need to be able to access a data base on my main computer at my office and run the program which is an Omnis 7 program. I have multi user capabilities for this program, so that all the computers can access the data files at the same time and reqad and write.
So this is my dileema.
Any help would be greatly appreciated
powerbook g3,emac Mac OS 9.2.x also 9.2 os, and 9.22 o.s.and 10.4
eww
Posts: 2,224
Registered: Jul 28, 2000
New! Re: I desperately need to solve this problem
Posted: May 17, 2006 6:08 PM in response to: drpresseye

well, at any or all of the locations you may need to open up the ports through your routers to allow ARD access.
Also, I'm wondering if you are experiencing problems between using old and new versions of remote desktop.
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How to open Adobe Reader file from another native IOS application?
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Not to hijack the conversation but I can explain why this would be useful for both the above case and another.
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Socket read() call returning before timeout.

I have a couple of applications which use the following basic socket reading approach:
Socket socket = new Socket("192.168.0.1", 54321);
socket.setSoTimeout (5000);
InputStream stream = socket.getInputStream();
byte[] data = new byte[232];
boolean done = false;
while (!done) {
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I know that with normal (file) input streams, read can return whenever it wants regardless of how many bytes were read, however I was under the impression that network streams are supposed to block until all the data arrives (or a timeout occurs, if set). Is this incorrect?

djpeaco wrote:
I know that with normal (file) input streams, read can return whenever it wants regardless of how many bytes were readThat's correct and that's exactly the reason you see the behavior you see.
however I was under the impression that network streams are supposed to block until all the data arrives (or a timeout occurs, if set).Why? Why do you think that network streams behave differently in this regard?
Why shouldn't it give you the data as soon as it's available, when every other stream works this way?
Is this incorrect?Yes, you must assume that the streams of a socket follow the general InputStream/OutputStream contract and that includes possibly returning from read() before the full array is filled.

JDBC pooling Oracle driver Socket read timed out

I run Java EE application on Glassfish server v3 together with Oracle 12 DB on the same machine under Windows Server 2012 64bit. I use latest ojdbc7 driver.
Connection pool config:
<jdbc-connection-pool validation-table-name="DUAL" steady-pool-size="20" statement-cache-size="100" associate-with-thread="true" statement-timeout-in-seconds="30" idle-timeout-in-seconds="60" max-wait-time-in-millis="2000" validate-atmost-once-period-in-seconds="20" datasource-classname="oracle.jdbc.pool.OracleDataSource" pool-resize-quantity="5" max-pool-size="60" res-type="javax.sql.DataSource" name="dbPool" is-connection-validation-required="true">
<property name="driverClass" value="oracle.jdbc.OracleDriver"></property>
<property name="user" value="xxx"></property>
<property name="url" value="jdbc:oracle:thin:@(DESCRIPTION=(ENABLE=BROKEN)(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=127.0.0.1)(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME=orcl)))"></property>
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<property name="portNumber" value="1521"></property>
<property name="databaseName" value="orcl"></property>
<property name="serverName" value="127.0.0.1"></property>
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</jdbc-connection-pool>
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javax.enterprise.resource.resourceadapter.com.sun.enterprise.resource.allocator|_ThreadID=152;_ThreadName=Thread-2;|RAR5038:Unexpected exception while creating resource for pool dbPool. Exception : javax.resource.spi.ResourceAllocationException: Connection could not be allocated because: IO Error: Socket read timed out
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Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: IO Error: Socket read timed out
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Fatal NI connect error 12560, connecting to:
(LOCAL=NO)
VERSION INFORMATION:
TNS for 64-bit Windows: Version 12.1.0.1.0 - Production
Oracle Bequeath NT Protocol Adapter for 64-bit Windows: Version 12.1.0.1.0 - Production
Windows NT TCP/IP NT Protocol Adapter for 64-bit Windows: Version 12.1.0.1.0 - Production
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ns main err code: 12560
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ns secondary err code: 0
nt main err code: 0
nt secondary err code: 0
nt OS err code: 0
opiodr aborting process unknown ospid (3404) as a result of ORA-609
When I just reset db listener everything works ok for next 1-2 hours (depends on application load). So temporary solution is to run bat script from windows scheduler to reset the listener every 1h.
I tried everything I could find - applied these parameters:
- Sqlnet.ora:
SQLNET.INBOUND_CONNECT_TIMEOUT=180
SQLNET.EXPIRE_TIME=5
- Listener.ora:
INBOUND_CONNECT_TIMEOUT_LISTENER_IPC=120
But still without success

Is the problem here just that you need a connection pool that closes idle connections? Some pools will close idle connections after a time out period. And the pool lets you set that time out period. If the pool you are using doesn't provide that then use a different pool.

Java.sql.SQLException: Socket read timed out

// DbTest.java
<code>
import java.sql.*;
import java.io.*;
public class DbTest
public static void main(String args[])
System.out.println("DbTest main(-)");
Connection con = null;
try
Class.forName("oracle.jdbc.driver.OracleDriver");
System.out.println("class loaded");
con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcldb","scott","tiger");
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class loaded
java.sql.SQLException: Socket read timed out
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:412)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:
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at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:221)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtensio
n.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:503)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at DbTest.main(DbTest.java:17)
Caused by: oracle.net.ns.NetException: Socket read timed out
at oracle.net.ns.Packet.receive(Packet.java:320)
at oracle.net.ns.NSProtocol.connect(NSProtocol.java:286)
at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1042)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:301)
... 7 more
i am using win 7 64bit os , Oracle 11.2, Jdk 1.7 how can i resolve this problem?
Edited by: 910776 on Oct 4, 2012 10:49 AM

Your other thread got locked because all you did was post a bunch of code without explaining what your question or issue was or what the code is supposed to be doing.
java.sql.SQLException: Socket read timed out
Simply reposting in this forum isn't enough. Edit your post and and add \ tags on the line before and the line after the code to preserve the formatting.
Also explain what you are trying to do, the problem you are having and answer the questions I ask you in your other thread.
{quote}
What is it you are trying to do?
Why are you trying to connect to two different databases?
Do either of those databases actually exist?
Do they exist on the local machine that Java is running on?
Can you connect to either of them without using Java?
{quote}

Linux socket read incomplete

Hi,
I have a problem with socket read on linux, when i do a socket read it does not read the complete string whereas the same program on windows read the string completely over a socket connections. Does anybody now why this is strange behaviour is happening on linux?
BK

You got lucky on Windows. The only guarantee from a blocking socket read is that you will read at least one byte or get an EOF,

Java.sql.SQLException: Io exception: Socket read timed out

Hello,
I've a interface RFC - JDBC - RFC.
When this interface is executing, i have the follow error in RuntimeWorkbench::
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<SAP:P1 />
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<SAP:ApplicationFaultMessage namespace="" />
<SAP:Stack />
<SAP:Retry>M</SAP:Retry> '
this error don't occurs always, when and why i don't know..
I searched for information about this error and nothing found
why it is happens?
thank very much

HI,
This is not a problem in ur mapping or configuration.
This is a problem with JDBC connection. This is a common error, that generally comes when the DB server is receiving and processing numerous records. Connection time out or socket read time out.
First try this:
In ur JDBC adapter go to Advanced Tab Page and check Transaction Isolation Level as Serializable.
If still problem persists then take help of basis guys and increase the timeout for the connection, same thing can be asked from DB team.

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