Phantom Reads / Data Concurrency

I am using OWB 10.2.
I am encountering phantom reads within some of my OWB maps. These phantom reads are caused by activity on the source system when I am sucking the data from the source tables. The problem is my map does an update and then an insert. The activity on the source occurs after the update transaction has started but before the insert transaction.
Does anyone know of a setting in OWB that allows serializable transactions?
I thought of using the command "SET TRANSACTION ISOLATION LEVEL SERIALIZABLE" and changing the Commit Control to Manual for the map but can I put the set transaction command in a Pre-Mapping process? Or does it have to be in a SQL*Plus operator in the Process Flow.
I cannot find any information about Data Concurrency in the OWB documentation and am surprised that no one has encountered this problem before.
Help!

Hi,
Check the below links:
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:27523665852829
http://www.experts-exchange.com/Database/Oracle/Q_20932242.html
Best regards,
Rafi.
http://rafioracledba.blogspot.com

Similar Messages

Phantom read

Phantom reads :
A transaction reexecutes a query returning a set of rows that satisfy a search condition and finds that the set of rows satisfying the condition has changed due to another committed transaction in the meantime.
Occurs when one transaction begins reading data and another inserts to or deletes data from the table being read.
Question :
whats the output we get when there is a phantom read ?
let me make a demo example which will mimic the above scenario.
say, I am a bank customer . i have an account ....i am searching for transaction records for the past 2 months via netbanking online statement search option.
Now, in the mean time(concurrently)......one banker deleted some of my transaction records .
I think , I have framed the phantom read problem correctly now.
Question is : what will be the output when really there is such type of situation occurs ?
see, i am assuming that this is not a dirty read case...that is the banker has commited his activity.
so, what output i would expect when there is a phantom read ?

Dirty read would be when you would read data made by another transaction that would be rolled back.
Phantom read seems to be reading data that doesn't exist at the time of the making of the query (in the case of inserting). Doesn't sound very dangerous to me, when comparing to a dirty read.
For your bank example, you would just see one transaction less in your records.

TcpListener not working on Azure: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host

Hi Everybody,
i'm playing a little bit with Windows Azure and I'm blocked with a really simple issue (or maybe not).
I've created a Cloud Service containing one simple Worker Role. I've configured an EndPoint in the WorkerRole configuration, which allows Input connections via tcp on port 10100.
Here the ServiceDefinition.csdef file content:
<?xml version="1.0" encoding="utf-8"?>
<ServiceDefinition name="EmacCloudService" xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceDefinition" schemaVersion="2014-01.2.3">
<WorkerRole name="TcpListenerWorkerRole" vmsize="Small">
<Imports>
<Import moduleName="Diagnostics" />
<Import moduleName="RemoteAccess" />
<Import moduleName="RemoteForwarder" />
</Imports>
<Endpoints>
<InputEndpoint name="Endpoint1" protocol="tcp" port="10100" />
</Endpoints>
</WorkerRole>
</ServiceDefinition>
This WorkerRole is just creating a TcpListener object listening to the configured port (using the RoleEnvironment instance) and waits for an incoming connection. It receives a message and returns a hardcoded message (see code snippet below).
namespace TcpListenerWorkerRole
using System;
using System.Net;
using Microsoft.WindowsAzure.ServiceRuntime;
using System.Net.Sockets;
using System.Text;
using Roche.Emac.Infrastructure;
using System.IO;
using System.Threading.Tasks;
using Microsoft.WindowsAzure.Diagnostics;
using System.Linq;
public class WorkerRole : RoleEntryPoint
public override void Run()
// This is a sample worker implementation. Replace with your logic.
LoggingProvider.Logger.Info("TcpListenerWorkerRole entry point called");
TcpListener listener = null;
try
listener = new TcpListener(RoleEnvironment.CurrentRoleInstance.InstanceEndpoints["Endpoint1"].IPEndpoint);
listener.ExclusiveAddressUse = false;
listener.Start();
LoggingProvider.Logger.Info(string.Format("TcpListener started at '{0}:{1}'", RoleEnvironment.CurrentRoleInstance.InstanceEndpoints["Endpoint1"].IPEndpoint.Address, RoleEnvironment.CurrentRoleInstance.InstanceEndpoints["Endpoint1"].IPEndpoint.Port));
catch (SocketException ex)
LoggingProvider.Logger.Exception("Unexpected exception while creating the TcpListener", ex);
return;
while (true)
Task.Run(async () =>
TcpClient client = await listener.AcceptTcpClientAsync();
LoggingProvider.Logger.Info(string.Format("Client connected. Address='{0}'", client.Client.RemoteEndPoint.ToString()));
NetworkStream networkStream = client.GetStream();
StreamReader reader = new StreamReader(networkStream);
StreamWriter writer = new StreamWriter(networkStream);
writer.AutoFlush = true;
string input = string.Empty;
while (true)
try
char[] receivedChars = new char[client.ReceiveBufferSize];
LoggingProvider.Logger.Info("Buffer size: " + client.ReceiveBufferSize);
int readedChars = reader.Read(receivedChars, 0, client.ReceiveBufferSize);
char[] validChars = new char[readedChars];
Array.ConstrainedCopy(receivedChars, 0, validChars, 0, readedChars);
input = new string(validChars);
LoggingProvider.Logger.Info("This is what the host sent to you: " + input+". Readed chars=" + readedChars);
try
string orderResultFormat = Encoding.ASCII.GetString(Encoding.ASCII.GetBytes("\xB")) + @"MSH|^~\&|Instrument|Laboratory|LIS|LIS Facility|20120427123212+0100||ORL^O34^ORL_O34| 11|P|2.5.1||||||UNICODE UTF-8|||LAB-28^IHE" + Environment.NewLine + "MSA|AA|10" + Environment.NewLine + @"PID|||patientId||""""||19700101|M" + Environment.NewLine + "SPM|1|sampleId&ROCHE||ORH^^HL70487|||||||P^^HL70369" + Environment.NewLine + "SAC|||sampleId" + Environment.NewLine + "ORC|OK|orderId|||SC||||20120427123212" + Encoding.ASCII.GetString(Encoding.ASCII.GetBytes("\x1c\x0d"));
writer.Write(orderResultFormat);
catch (Exception e)
LoggingProvider.Logger.Exception("Unexpected exception while writting the response", e);
client.Close();
break;
catch (Exception ex)
LoggingProvider.Logger.Exception("Unexpected exception while Reading the request", ex);
client.Close();
break;
}).Wait();
public override bool OnStart()
// Set the maximum number of concurrent connections
ServicePointManager.DefaultConnectionLimit = 12;
DiagnosticMonitor.Start("Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString");
RoleEnvironment.Changing += RoleEnvironment_Changing;
return base.OnStart();
private void RoleEnvironment_Changing(object sender, RoleEnvironmentChangingEventArgs e)
// If a configuration setting is changing
LoggingProvider.Logger.Info("RoleEnvironment is changing....");
if (e.Changes.Any(change => change is RoleEnvironmentConfigurationSettingChange))
// Set e.Cancel to true to restart this role instance
e.Cancel = true;
As you can see, nothing special is being done. I've used the RoleEnvironment.CurrentRoleInstance.InstanceEndpoints to retrieve the current IPEndpoint.
Running the Cloud Service in the Windows Azure Compute Emulator everything works fine, but when I deploy it in Azure, then I receive the following Exception:
2014-08-06 14:55:23,816 [Role Start Thread] INFO EMAC Log - TcpListenerWorkerRole entry point called
2014-08-06 14:55:24,145 [Role Start Thread] INFO EMAC Log - TcpListener started at '100.74.10.55:10100'
2014-08-06 15:06:19,375 [9] INFO EMAC Log - Client connected. Address='196.3.50.254:51934'
2014-08-06 15:06:19,375 [9] INFO EMAC Log - Buffer size: 65536
2014-08-06 15:06:45,491 [9] FATAL EMAC Log - Unexpected exception while Reading the request
System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
--- End of inner exception stack trace ---
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at System.IO.StreamReader.ReadBuffer(Char[] userBuffer, Int32 userOffset, Int32 desiredChars, Boolean& readToUserBuffer)
at System.IO.StreamReader.Read(Char[] buffer, Int32 index, Int32 count)
at TcpListenerWorkerRole.WorkerRole.<>c__DisplayClass0.<<Run>b__2>d__0.MoveNext() in C:\Work\Own projects\EMAC\AzureCloudEmac\TcpListenerWorkerRole\WorkerRole.cs:line 60
I've already tried to configure an internal port in the ServiceDefinition.csdef file, but I get the same exception there.
As you can see, the client can connect to the service (the log shows the message: Client connected with the address) but when it tries to read the bytes from the stream, it throws the exception.
For me it seems like Azure is preventing the retrieval of the message. I've tried to disable the Firewall in the VM in Azure and the same continues happening.
I'm using Windows Azure SDK 2.3
Any help will be very very welcome!
Thanks in advance!
Javier
En caso de que la respuesta te sirva, porfavor, márcala como válida
Muchas gracias y suerte!
Javier Jiménez Roda
Blog: http://jimenezroda.wordpress.com

hi Javier,
I changed your code like this:
private AutoResetEvent connectionWaitHandle = new AutoResetEvent(false);
public override void Run()
TcpListener listener = null;
try
listener = new TcpListener(
RoleEnvironment.CurrentRoleInstance.InstanceEndpoints["Endpoint"].IPEndpoint);
listener.ExclusiveAddressUse = false;
listener.Start();
catch (SocketException se)
return;
while (true)
IAsyncResult result = listener.BeginAcceptTcpClient(HandleAsyncConnection, listener);
connectionWaitHandle.WaitOne();
The HandleAsync method is your "While (true)" code:
private void HandleAsyncConnection(IAsyncResult result)
TcpListener listener = (TcpListener)result.AsyncState;
TcpClient client = listener.EndAcceptTcpClient(result);
connectionWaitHandle.Set();
NetworkStream netStream = client.GetStream();
StreamReader reader = new StreamReader(netStream);
StreamWriter writer = new StreamWriter(netStream);
writer.AutoFlush = true;
string input = string.Empty;
try
char[] receivedChars = new char[client.ReceiveBufferSize];
// LoggingProvider.Logger.Info("Buffer size: " + client.ReceiveBufferSize);
int readedChars = reader.Read(receivedChars, 0, client.ReceiveBufferSize);
char[] validChars = new char[readedChars];
Array.ConstrainedCopy(receivedChars, 0, validChars, 0, readedChars);
input = new string(validChars);
// LoggingProvider.Logger.Info("This is what the host sent to you: " + input + ". Readed chars=" + readedChars);
try
string orderResultFormat = Encoding.ASCII.GetString(Encoding.ASCII.GetBytes("\xB")) + @"MSH|^~\&|Instrument|Laboratory|LIS|LIS Facility|20120427123212+0100||ORL^O34^ORL_O34| 11|P|2.5.1||||||UNICODE UTF-8|||LAB-28^IHE" + Environment.NewLine + "MSA|AA|10" + Environment.NewLine + @"PID|||patientId||""""||19700101|M" + Environment.NewLine + "SPM|1|sampleId&ROCHE||ORH^^HL70487|||||||P^^HL70369" + Environment.NewLine + "SAC|||sampleId" + Environment.NewLine + "ORC|OK|orderId|||SC||||20120427123212" + Encoding.ASCII.GetString(Encoding.ASCII.GetBytes("\x1c\x0d"));
writer.Write(orderResultFormat);
catch (Exception e)
// LoggingProvider.Logger.Exception("Unexpected exception while writting the response", e);
client.Close();
catch (Exception ex)
//LoggingProvider.Logger.Exception("Unexpected exception while Reading the request", ex);
client.Close();
Please try it. For this error message, I suggest you could refer to this thread (http://stackoverflow.com/questions/6173763/using-windows-azure-to-use-as-a-tcp-server
) and this post (http://stackoverflow.com/a/5420788).
Regards,
Will
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Com.evermind.server.http.HttpIOException: There is no process to read data

Hi,
In one of our web application deployed in OC4J( Oracle9ias 9.0.2.3) containers we are getting "com.evermind.server.http.HttpIOException: There is no process to read data written to a pipe." Exception.
The Stack Trace:
com.evermind.server.http.HttpIOException: There is no process to read data written to a pipe.
     at com.evermind.server.http.EvermindServletOutputStream.flush(EvermindServletOutputStream.java(Compiled Code))
     at java.io.OutputStreamWriter.flush(OutputStreamWriter.java(Compiled Code))
     at java.io.OutputStreamWriter.close(OutputStreamWriter.java(Compiled Code))
     at com.ramco.security.servlet.Dispatcher.sendResponse(Dispatcher.java(Inlined Compiled Code))
     at com.ramco.security.servlet.Dispatcher.service(Dispatcher.java(Compiled Code))
     at javax.servlet.http.HttpServlet.service(HttpServlet.java(Compiled Code))
     at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java(Compiled Code))
     at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java(Compiled Code))
     at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java(Compiled Code))
     at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java(Compiled Code))
     at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java(Compiled Code))
     at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java(Compiled Code))
     at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java(Compiled Code))
     at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:802)
     at java.lang.Thread.run(Thread.java:513)
Can anyone help us in resolving this issue?
Regards,
Suresh.M

Hi,
No... It is yet to be resolved.
Oracle Recommends us to go to 10g ( at least 9.0.4 ) to check the issue.
Thanks and Regards,
Suresh.M

Implement data concurrency

hi! i'm a java newbie and i've been tasked to create this web application. my question is what's good way / strategy to implement data concurrency?
for data concurrency, my officemate suggested this design :
if user A is editing a record in the table then that record should be locked from other users. A class, called UserAccessRightsManager, will supervise all the locked records. So, if user B wishes to edit that record, he must go through UserAccessRightsManager. Is this a good idea? If not, can you give some suggestions? I'm a bit worried with his idea. What if two users edit the same record at the same time?
would appreciate any help! thanks!

What backend database are you using? I would let the db handle locking.

The attempt to read data from the server failed

Today I was looking into an error with several IMAP accounts in Apple Mail:
+The attempt to read data from the server "<<servername.tld>>" failed.+
At first I thought this was an Apple Mail problem, as the accounts in question seemed to work just fine when not used in combination. One possible answer to this problem is rather short:
Apple Mail uses IMAP caching, which uses more than 4 connections at the same time to the mail server. Some mail servers (like courier-imap in its default configuration) do not allow that much connections from the same IP address. The more accounts you are trying to connect to at the same time raises this number of connections. Meaning while you could probably check one account for new mails, the second will ultimately fail for no obvious reasons. The only solution to this problem is to raise the connections allowed by your IMAP server software. this solution only applies to people who have root access to their mail server.
in courier-imap you have to edit /etc/courier-imap/imapd
and change MAXPERIP=4 to a higher number (5 to 10 times the number of accounts you want to check simultaneously)
and change MAXDAEMONS=40 to a higher number (with only one user 200 might work, whereas if you serve multiple users, something like 500 or higher might be better suited).
of course increasing the numbers increases load on your server. this is why there are these restrictions in place.

MY SOLUTION REPOSTED FROM ANOTHER THREAD:
I've just solved a similar issue.
I have a dedicated server running Plesk 9.5 and when I upgraded to iLife 11 and Snow Leopard this error appeared. I could quickly click "get mail" and I'd get all my mail, but only 3-4 of my 9 mail accounts would connect. Theo others would have the error:
"The server error encountered was: The attempt to read data from the server..."
I found solutions for those using IMAP mail:
modify the /etc/courier-imap/imapd configuration file and change MAXDAEMONS from 40 to 80 and MAXPERIP from 4 to 40. This allows all the machines behind my home firewall to connect to multiple accounts on the e-mail server with mailbox caching enabled.
I'd made this change on my server but it didn't seem to have any effect. It dawned on me that I'm using POP, not IMAP. So I found in /etc/courier-imap/pop3d the same settings. I changed the MAXDAEMONS from 40 to 80 and MAXPERIP from 4 to 40 and voila, all my connections concurrently worked.
This has taken me more than two days to fix and I hope posting this helps someone else with the same issue.

Nonrepeatable Reads and Phantom Reads

Guys, I am very confuse about the definitions of Nonrepeatable Reads and Phantom Reads when I read the BEA Documentaion in http://e-docs.bea.com/workshop/docs81/doc/en/wls/guide/advanced/EJBsAndTransactions.html
The definition was queit confusing to me because they seems to describe the same thing, but it is obviously not the same thing. The problem is to see the difference among then.
What is that difference? Could I have an practical example of that difference?
Thanks everyone

Non-Repeatable reads: When a row is updated in database. 2 reads may not return same data.
Phantom reads is where a new row is inserted into the database, hence the 2 selects may not return same set of data.
Chekc the link below for example queies. hope it helps.
http://en.wikipedia.org/wiki/Isolation_(computer_science)
#Phantom_Reads

Dirty reads vs phantom reads

Hi,
What is the difference between a "Dirty Read" and "Phantom Reads". Can anyone explain in brief or give an example?
Thanks in advance.

A dirty read is an uncommitted read, which may or may not be exist in the table. A phantom is a ghost record that doesn't appear in a transaction initially but appears if it is read again because some other transaction has inserted rows matching the criteria.
Here are examples of both:
--Dirty read example
create table t1 (c1 int null, c2 varchar(50) null)
go
insert t1(c1, c2) values (1, 'one')
insert t1(c1, c2) values (2, 'two')
insert t1(c1, c2) values (3, 'three')
insert t1(c1, c2) values (4, 'four')
begin tran
update t1 set c2 = 'zero'
-- let this run in the current query window and open a new query window to run the below statement
--and you will see all 4 rows having a value of 0 in column c2, which is uncommitted data
select * from t1 with (nolock)
--uncomment this and run the below statement and rerun the above statement
--and you will see the previous values of one, two, three and four
--rollback tran
Here's an example of a phantom reads:
--Phantom example
create table t1 (c1 int null, c2 varchar(50) null)
go
insert t1(c1, c2) values (1, 'one')
insert t1(c1, c2) values (2, 'two')
insert t1(c1, c2) values (3, 'three')
insert t1(c1, c2) values (4, 'four')
-- let this run in the current first query window and open a second query window to run the below statement
--and you will see all 2 rows having a value in column c2 starting with character t
begin tran
select * from t1
where c2 like 't%'
--now insert the new value of ten (matching the query criteria - starts with t) from the first query window
insert t1(c1, c2) values (10, 'ten')
--Run the below statement again from the second query window that is open and you will see the new row
--that got inserted - so 3 rows are seen including the newly inserted ten
--this new row is a phantom read
select * from t1
where c2 like 't%'
--uncomment this and run the below statement in the second query window
--rollback tran
Satish Kartan www.sqlfood.com

Nonrepeatable reads & phantom reads

hi
whats the difference nonrepetable(fuzzy) read & phantom read phenomena.
from the docs i undertand they both are same but non repetable reads signify that
modified or deleted rows committed by other transactions can be seen by the same query
when run again
whereas in case of phantom read when the query is run again for the second time
it can see newly inserted rows committed by other transactions.
Correct me if i am wrong. If possible illustrate with an example.
bye
Sushant

Non-Repeatable reads: When a row is updated in database. 2 reads may not return same data.
Phantom reads is where a new row is inserted into the database, hence the 2 selects may not return same set of data.
Chekc the link below for example queies. hope it helps.
http://en.wikipedia.org/wiki/Isolation_(computer_science)
#Phantom_Reads

Shared data - concurrent access

Entity beans are best used when shared data is being concurrently accessed.
Could you please clarify this statement . How does it different than shared data - concurrent access by jdbc DAO class ?

jverd wrote:
I have no idea what you're asking. I cannot provide clarification until you do.Ok. let me explain further. my question is , is it a good idea that whenever we need shared concurrent data access in a application Entity bean is the best ? Why? does it really outsmart the jdbc DAO access methodology whenever it comes to the realm of shared concurrent data access ?
For example: I can think of a system e.g online auction house application. This needs concurrent shared data access ..right ?
Do you think use of Entity bean is best here instead of jdbc DAO access methodology ? Why ?

Server error: "The attempt to read data from the server '(null)' failed"

Multiple times during each day my client (Mail.app) puts up a little exclamation mark "!" next to the mail account hosted on our Leopard Server. Clicking on this little alert icon pops up a message that reads:
+There may be a problem with the mail server or network. Verify the settings for account “Leopard Server Account” or try again.+
+The server returned the error: The attempt to read data from the server “(null)” failed.+
I can make the "!" go away by choosing Mailbox>Synchronize>Leopard Server Account. And everything seems peachy but it inevitably pops up again in another hour or two. It's annoying because I'm not sure if mail is getting through or not when the "!" is up.
Any ideas why this is happening?

MY SOLUTION REPOSTED FROM ANOTHER THREAD:
I've just solved a similar issue.
I have a dedicated server running Plesk 9.5 and when I upgraded to iLife 11 and Snow Leopard this error appeared. I could quickly click "get mail" and I'd get all my mail, but only 3-4 of my 9 mail accounts would connect. Theo others would have the error:
"The server error encountered was: The attempt to read data from the server..."
I found solutions for those using IMAP mail:
modify the /etc/courier-imap/imapd configuration file and change MAXDAEMONS from 40 to 80 and MAXPERIP from 4 to 40. This allows all the machines behind my home firewall to connect to multiple accounts on the e-mail server with mailbox caching enabled.
I'd made this change on my server but it didn't seem to have any effect. It dawned on me that I'm using POP, not IMAP. So I found in /etc/courier-imap/pop3d the same settings. I changed the MAXDAEMONS from 40 to 80 and MAXPERIP from 4 to 40 and voila, all my connections concurrently worked.
This has taken me more than two days to fix and I hope posting this helps someone else with the same issue.

Attempt to read data from the server failed...

I'm getting the following error on one of my email accounts:
+There may be a problem with the mail server or network. Verify the settings for account “[my account]” or try again.+
+The server returned the error: The attempt to read data from the server “[my account]” failed.+
I'd like to find out more about the error, so that I can start to track this down and see if there is a problem with the mail server settings, or if the problem is on my end.
I don't see any reference to this error in the logs – would it be somewhere else?

I've just solved a similar issue.
I have a dedicated server running Plesk 9.5 and when I upgraded to iLife 11 and Snow Leopard this error appeared. I could quickly click "get mail" and I'd get all my mail, but only 3-4 of my 9 mail accounts would connect. Theo others would have the error:
The server error encountered was: The attempt to read data from the server...
I found solutions for those using IMAP mail:
modify the /etc/courier-imap/imapd configuration file and change MAXDAEMONS from 40 to 80 and MAXPERIP from 4 to 40. This allows all the machines behind my home firewall to connect to multiple accounts on the e-mail server with mailbox caching enabled.
I'd made this change on my server but it didn't seem to have any effect. It dawned on me that I'm using POP, no IMAP. So I found in /etc/courier-imap/pop3d the same settings. I changed the MAXDAEMONS from 40 to 80 and MAXPERIP from 4 to 40 and voila, all my connections concurrently worked.
This has taken me more than two days to fix and I hope posting this helps someone else with the same issue.

View Object to read data from a java file

Hi,
I am using JDeveloper 11.1.1.4 and ADF-BC in my application.
For one of my view objects , I want the data to be read from a java file which exposes some method to return a collection.
I cannot use a static view object in this case.
Please suggest the best way to implement this requirement.Basically build a view object that should read data from a java file.
Thanks,
Praveen

Depending on your use case you can either use a programmatic VO or directly expose the JV class as a data control.
http://docs.oracle.com/cd/E18941_01/tutorials/jdtut_11r2_36/jdtut_11r2_36.html

Read data from SAP R/3 Class-System

Hello,
first of all sorry when I posted this into the wrong subforum, but I wasn't sure about that. My Question is how to read data from the Classystem I have specified in my ABAP report.
The goal is to read data from my individual class-system as well as data from MM and write them to a table that is to be read by another report. But right now I can't find information about the class system and abap. Maybe you know some tutorials or blogs about right that topic you can suggest?

What class system have you specified in your report?
Normally a class can be used by declaring a variable of type of the class in question, if this class can be instantiated this is. If your class can't be instantiated, but it has only class methods, you can call this method directly.
But there is a lot more to this ABAP Object Oriented Programming, than just this short explanation. Search on SDN for some ABAP OO Tutorials.
some links:
http://help.sap.com/saphelp_nw2004s/helpdata/en/c3/225b5654f411d194a60000e8353423/frameset.htm
http://www.sapgenie.com/abap/OO/
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/b6cae890-0201-0010-ef8b-f970a9c41d47
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/1591ec90-0201-0010-3ba8-cdcd500b17cf
Transacation ABAPDOCU.

Can not read data from URL!

Hello,
I want to read data from URL (http://84.100.130.82:8000/;stream.nsv). But can not do it. Because when try to call function openDataInputStream() shows this error: java.io.IOException: response does not start with HTTP it starts with: ICY. How I can fix this bug?
HttpConnection c = null;
InputStream is = null;
OutputStream os = null;
StringBuffer b = new StringBuffer();
String response,
responseLitle;
c = (HttpConnection)Connector.open(“http://84.100.130.82:8000/;stream.nsv”);
os = c.openOutputStream();
os.flush();
is = c.openDataInputStream(); // ERROR CODE HERE
int ch;
// receive output
while ((ch = is.read()) != -1)
b.append((char) ch);
response = b.toString();Regards, Ramunas

Hi, I�m trying to do the same as above, get MP3 from a Shoutcast server.
I got the same fault ("response does not start with HTTP it starts with: ICY") when I tried to open an HttpConnection as bellow:
============================================
HttpConnection conn = (HttpConnection) Connector.open("http://64.236.34.196/stream/1074");
Then I tried to open a socket connection as bellow:
======================================
SocketConnection conn = (SocketConnection) Connector.open("socket://64.236.34.196:80");
String get = "GET /stream/1074 HTTP/1.1";
DataOutputStream os = conn.openDataOutputStream();
os.writeUTF(get);
InputStream is = conn.openInputStream();
But then I got the following error:
=========================
java.lang.SecurityException: Target port denied to untrusted applications
Could someone help me to find out what is going on?
Thanks a lot!

Phantom Reads / Data Concurrency

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