Distributed Server Session management

Hi,
I wanted to know how to maintain the session in the case when the servers are in a distributed environment, i mean the http request is sent to one server which inturn checks if any of the web-servers is free and redirects the request to it. When there are many users accessing the site simultaneously, then maintaining serverside session becomes a problem.
Any help is appreciated.
Chrs
Anidhar

There are cookies, URL rewriting, backend application servers that replicate across a cluster, etc.

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I am trying to achieve server side session management following is my code.
public static void main(String[] args) {
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JMF error - Format of Stream not supported in RTP Session Manager

java.io.IOException: Format of Stream not supported in RTP Session Manager
at com.sun.media.datasink.rtp.Handler.open(Handler.java:139)
why this erro occors?
I already created the DataSink.
When I try to do this...
dsk.open(); //here the error got
dsk.start(); Code of server of media
I want to sent audio (wav) like a radio, but from file. Without stop to send streaming. PullBufered
*Class Server that you offers Streaming of midia
public class Servidor {
private MediaLocator ml;
private Processor pro;
private javax.media.protocol.DataSource ds;
private DataSink dsk;
private boolean codificado = false;
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// ex: d:\music\music.wav
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descreverConteudoEnviado();
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formatRTP();
//creat the streaming
criarStreaming();
//configure the server
configurarServidor(ip, porta);
//in this method raise the excepition
iniciarServidor();
//when I try to open the DataSink.open() raises the exception
//java.io.IOException: Format of Stream not supported in RTP Session //Manager
// at com.sun.media.datasink.rtp.Handler.open(Handler.java:139)
} catch (RuntimeException e) {
System.out.println("Houve um erro em iniciarServicoServidor");
e.printStackTrace();
public void capturarMidia(String endereco)
try {
System.out.println("**************************************************************");
System.out.println("Iniciando processo de servidor de multimidia em " + Calendar.getInstance().getTime().toString());
ml = new MediaLocator("file:///" + endereco);
System.out.println("Midia realizada com sucesso.");
System.out.println ("[" + "file:///" + endereco +"]");
} catch (RuntimeException e) {
System.out.println("Houve um erro em capturarMidia");
e.printStackTrace ();
public void criarProcessor()
try {
System.out.println("**************************************************************");
pro = Manager.createProcessor(ml);
System.out.println("Processor criado com sucesso.");
System.out.println("Midia com durcao:" + pro.getDuration().getSeconds());
} catch (NoProcessorException e) {
System.out.println("Houve um erro em criarProcessor");
e.printStackTrace();
} catch (IOException e) {
System.out.println ("Houve um erro em criarProcessor");
e.printStackTrace();
public void configurarProcessor()
try {
System.out.println("**************************************************************");
System.out.println("Processor em estado de configura��o.");
pro.configure();
System.out.println("Processor configurado.");
} catch (RuntimeException e) {
System.out.println("Houve um erro em configurarProcessor");
e.printStackTrace();
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try {
System.out.println("**************************************************************");
pro.setContentDescriptor(new ContentDescriptor(ContentDescriptor.RAW));
System.out.println("Descritor de conteudo:" + pro.getContentDescriptor().toString());
} catch (NotConfiguredError e) {
System.out.println("Houve um erro em descreverConteudoEnviado");
e.printStackTrace();
private Format checkForVideoSizes(Format original, Format supported) {
int width, height;
Dimension size = ((VideoFormat)original).getSize();
Format jpegFmt = new Format(VideoFormat.JPEG_RTP);
Format h263Fmt = new Format(VideoFormat.H263_RTP);
if (supported.matches(jpegFmt)) {
// For JPEG, make sure width and height are divisible by 8.
width = (size.width % 8 == 0 ? size.width :
(int)(size.width / 8) * 8);
height = (size.height % 8 == 0 ? size.height :
(int)(size.height / 8) * 8);
} else if (supported.matches(h263Fmt)) {
// For H.263, we only support some specific sizes.
if (size.width < 128) {
width = 128;
height = 96;
} else if ( size.width < 176) {
width = 176;
height = 144;
} else {
width = 352;
height = 288;
} else {
// We don't know this particular format. We'll just
// leave it alone then.
return supported;
return (new VideoFormat(null,
new Dimension(width, height),
Format.NOT_SPECIFIED ,
null,
Format.NOT_SPECIFIED)).intersects(supported);
public void formatRTP()
try {
// Program the tracks.
TrackControl tracks[] = pro.getTrackControls();
Format supported[];
Format chosen;
for (int i = 0; i < tracks.length; i++) {
Format format = tracks.getFormat();
if (tracks[i].isEnabled()) {
supported = tracks[i].getSupportedFormats();
// We've set the output content to the RAW_RTP.
// So all the supported formats should work with RTP.
// We'll just pick the first one.
if (supported.length > 0) {
if (supported[0] instanceof VideoFormat) {
// For video formats, we should double check the
// sizes since not all formats work in all sizes.
chosen = checkForVideoSizes(tracks[i].getFormat(),
supported[0]);
} else
chosen = supported[0];
tracks[i].setFormat(chosen);
System.err.println("Track " + i + " is set to transmit as:");
System.err.println(" " + chosen);
codificado = true;
} else
tracks[i].setEnabled(false);
} else
tracks[i].setEnabled(false);
} catch (RuntimeException e) {
// TODO Auto-generated catch block
e.printStackTrace();
public void tocar()
pro.start();
public void criarStreaming()
try {
System.out.println("**************************************************************");
if (codificado)
System.out.println("Midia codificada...");
System.out.println("Processor entra em estado de realize.");
pro.realize();
System.out.println("Processor realized.");
System.out.println("Adquirindo o streaming a ser enviado.");
ds = pro.getDataOutput();
System.out.println("Streaming adquirido pronto a ser enviado.");
} catch (NotRealizedError e) {
System.out.println("Houve um erro em criarStreaming");
System.out.println(e.getMessage());
e.printStackTrace();
catch (Exception e) {
System.out.println(e.getMessage());
public void configurarServidor(String ip, int porta)
System.out.println("**************************************************************");
String url = "rtp://" + ip + ":" + porta + "/audio/1";
System.out.println("Servidor ira atender em " + url);
MediaLocator mml = new MediaLocator(url);
System.out.println("Localizador de midia ja criado");
try {
System.out.println("Criando um DataSink a ser enviado.");
dsk = Manager.createDataSink(ds, mml);
System.out.println("DataSink criado.");
} catch (NoDataSinkException e) {
e.printStackTrace();
public void iniciarServidor()
try {
System.out.println("**************************************************************");
dsk.open();
System.out.println("Servidor ligado.");
dsk.start();
System.out.println("Servidor iniciado.");
} catch (SecurityException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
Gives that output console.
All methods are executed but the last doesnt works.
The method that open the DataSink.
What can I do?
Iniciando processo de servidor de multimidia em Sun May 13 22:37:02 BRT 2007
Midia realizada com sucesso.
[file:///c:\radio.wav ]
Processor criado com sucesso.
Midia com durcao:9.223372036854776E9
Processor em estado de configura��o.
Processor configurado.
Descritor de conteudo:RAW
Midia codificada...
Processor entra em estado de realize.
Processor realized.
Adquirindo o streaming a ser enviado.
Streaming adquirido pronto a ser enviado.
Servidor ira atender em rtp://127.0.0.1:22000/audio/1
Localizador de midia ja criado
Criando um DataSink a ser enviado.
streams is [Lcom.sun.media.multiplexer.RawBufferMux$RawBufferSourceStream;@a0dcd9 : 1
sink: setOutputLocator rtp://127.0.0.1:22000/audio/1
DataSink criado.
Track 0 is set to transmit as:
unknown, 44100.0 Hz, 16-bit, Stereo, LittleEndian, Signed, 176400.0 frame rate, FrameSize=32 bits
java.io.IOException: Format of Stream not supported in RTP Session Manager
at com.sun.media.datasink.rtp.Handler.open(Handler.java:139)
at br.org.multimidiasi.motor.Servidor.iniciarServidor(Servidor.java:291)
at br.org.multimidiasi.motor.Servidor.iniciarServicoServidor(Servidor.java:43)
at br.org.multimidiasi.motor.ConsoleServidor.main(ConsoleServidor.java:30)
Since already thanks so much.
Exactally in this method raises erros.
Ive tried another formats (avi, mp3) but all with the same error, what I can do?
[code] public void iniciarServidor()
try {
System.out.println("**************************************************************");
dsk.open();
System.out.println("Servidor ligado.");
dsk.start();
System.out.println("Servidor iniciado.");
} catch (SecurityException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
Track 0 is set to transmit as:
unknown, 44100.0 Hz, 16-bit, Stereo, LittleEndian, Signed, 176400.0 frame rate, FrameSize=32 bits
java.io.IOException: Format of Stream not supported in RTP Session Manager
at com.sun.media.datasink.rtp.Handler.open(Handler.java:139)
at br.org.multimidiasi.motor.Servidor.iniciarServidor(Servidor.java:291)
at br.org.multimidiasi.motor.Servidor.iniciarServicoServidor(Servidor.java:43)
at br.org.multimidiasi.motor.ConsoleServidor.main(ConsoleServidor.java:30)

unknown, 44100.0 Hz, 16-bit, Stereo,
LittleEndian, Signed, 176400.0 frame rate,
FrameSize=32 bits
java.io.IOException: Format of Stream not supported
in RTP Session Manager
The fact that it doesn't know what the format is
might have to do with the problem. I've had similar
problems, and I've traced it back to missing jars and
codecs. Have you tried running the same code locally
without the transmission to see if you player will
even play the file?Already and it works, I used Player to play it and play normally, I try to make it with the diferents codecs of audio and video, but no sucess.

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Adhir_Mehta wrote:
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Session management for a web service and already answered. Locking.

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Attachments:
htttGetSession.vi ‏9 KB
WebServerError.PNG ‏13 KB

Hi can you please let me know how you resolved this issue?

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