Weird network output streaming....

This is what I notice...
I have made a simple file uploader, just for fun, which uploads files to my own file server, by a POST method through a multi-part/data form...
obviously I use an output stream to write the file content to the server..
say:
for(int i = file.read(); i!=-1; i=file.read())
uc.getOutputStream.write(i);
uc.getOutputStream.flush();btw, the above is just a very simplified code..
How come the upload does not finish when i=-1? I use a web analyzer to track my java program, and it tells that my Java program is still uploading file content despite i is already -1....
any explanation on this??
thanks alot

no one can help??
can any one explain how does the streaming/uploading mechanism work on behalf of Java's implementation?
thanks

Similar Messages

Compress the output stream..

Hello every body..
I have aproject that use the java applet to transmit a vedio and audio over the internet network to do a video conference application with other applet at another computer at the network..
I want to support the application so that the user that enter the conference can select the bandwidth of the internet he/she use and then accordin to choice i control the quality of the stream transmitted..
So i want any one can help me with any way can be used to reduce the quality( or resolution) of the output stream so the user can be comfortable with the output..
please any one can help me reply to me as fast as can..
I there is no method can be used also reply and say this..
Thanks...

Hi,
For audio use GSM codec. It just takes 12kbps of your bandwidth.
For video, if you need "ok" quality with low bandwidth, use H.263 codec and for good quality, but higher bandwidth use JPEG codec. below are complete functions on how to reduce qualities for both codecs (or at least try to). But before you have to create a video Processor (see AVTransmit3.java and AVReceive3.java examples on the net).
private void setReducedJPEGQuality(Processor videoProcessor) {
   Control cs[] = videoProcessor.getControls();
   QualityControl qc = null;
   VideoFormat jpegFmt = new VideoFormat(VideoFormat.JPEG);
   // Loop through the controls to find the Quality control for
   // the JPEG encoder.
   for (int i = 0; i < cs.length; i++) {
      if (cs[i] instanceof QualityControl && cs[i] instanceof Owned) {
         Object owner = ((Owned)cs).getOwner();
// Check to see if the owner is a Codec.
// Then check for the output format.
if (owner instanceof Codec) {
Format fmts[] = ((Codec)owner).getSupportedOutputFormats(null);
for (int j = 0; j < fmts.length; j++) {
if (fmts[j].matches(jpegFmt)) {
qc = (QualityControl)cs[i];
qc.setQuality(0.5f);
break;
if (qc != null) {
break;
This will reduce your JPEG bandwith to an average of 150kbps, with still a good quality.
           private void setReducedH263Quality(Processor videoProcessor) {
         Control cs[] = videoProcessor.getControls();
          QualityControl qc = null;
          BitRateControl brc = null;
          FrameRateControl frc = null;
          boolean done = false;
          //try with bit rate first
          for (int i = 0; i < cs.length; i++) {
              if(cs[i] instanceof Owned) {
                  if(cs[i] instanceof BitRateControl) {
                       brc = (BitRateControl)cs;
               if(brc.getBitRate()>0) {
                    brc.setBitRate(30000);               done = true;
               brc = null;
          if(done) {
               return ;
          //then look for quality control
          for (int i = 0; i < cs.length; i++) {
          if(cs[i] instanceof Owned) {
          if(cs[i] instanceof QualityControl) {
               qc = (QualityControl)cs[i];
               if(qc.getQuality()>0.0f) {
                    qc.setQuality(0.5f);
                    done = true;
               qc = null;
          if(done) {
               return ;
          //if that did not work, try setting frame rate
          for (int i = 0; i < cs.length; i++) {
          if(cs[i] instanceof Owned) {
          if(cs[i] instanceof FrameRateControl) {
               frc = (FrameRateControl)cs[i];
               frc.setFrameRate(6.0f);
               frc = null;
This will reduce your H.263 codec's bit rate to 80kbps. You cannot set less than that. I tried with many webcams and that's the least I could go.
Good luck.

Progress of output stream

Hi
I have written a small application that can post files via a http request. It all works fine.
But now i would like to monitor the progress of this fileupload. How do i do this.
I have tried using all sorts of outputstreams but i can only seem to get updated as the filecontents is transfered from the inputstream(filereader) to the buffer of the output stream, not the actual transfer over the network.
I dont need any gui stuff, i will figure that out later. I woud just like a print to the terminal for eg. every 1K that is transfered.
Any help is apreciated
/Jacob Oettinger

The outputstream originates from an URLConnection.
Does this meen anything in this context?Yes, I'm quite sure. The connector will write data into an internal buffer before sending it. I'm not absolutely sure what effectively triggers the HTTP connection to be established, and I don't think you have access to the underlying streaming.
I am running the program from the commandline. I have
seen applets online that acompliches what i am trying
to do. Are there any chance that an applet will
behave different?Hard to tell. Typically it's up to the implementation whether streaming is done, data is buffered or whatever strategy is used. Maybe it's a configuration issue or a matter of different Java versions. However, what you can do is to open a network socket and implement HTTP by your own. You might want to try other implementations as well (see jakarta.apache.org for an example implementation of HTTP).

Sending Data Through a Output Stream...

Hello,
I am writing a program that works on a network...a server is running and client will connect to the server and send specific data for the server to complete transactions on.
The transactions that are mainly seen are SQL SELECT statements and as you can imagine a statement could bring back many records.
At present I have been able to send specific data through streams and have turned this into parameters on the server side and performed SQL. What I need help with or suggestions on is how to get the data back to the client. In some cases it may need to be displayed on screen or just used for further processing?
Please let me know if this is not 100% clear.
Thanks,
P

If you are able to send data over a network, then I assume that you know how to do network programming in Java, as well as knowing SQL.
Java has JDBC - Java DataBase Connectivity API that supports your requirements in full.
If you require a custom solution, then you need to be able to read data back from the server - when the server returns the ResultSet back to the client.
A Socket object has both input and output streams. Seems that you know about the output stream, do you not know about the input stream?
If the server is setup to send data back to the client over the same socket, then you should simply be able to read the results back from the socket's input stream.

Flushing output streams

Hello,
          I was a getting a harmlous excpetion :
          <4/06/2002 16:48:04> <Error> <HTTP> <Servlet execution in servlet
          context "WebAppServletContext(5985988,root,/root)" failed,
          java.net.ProtocolException: Didn't meet stated Content-Length, wrote:
          '7358
          4' bytes instead of stated: '94440' bytes.
          java.net.ProtocolException: Didn't meet stated Content-Length, wrote:
          '73584' bytes instead of stated: '94440' bytes.
          at
          weblogic.servlet.internal.ServletOutputStreamImpl.finish(ServletOutputStreamImpl.java:413)
          at
          weblogic.servlet.internal.ServletResponseImpl.send(ServletResponseImpl.java:974)
          at
          weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:1964)
          at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137)
          at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
          I read about it on this newsgroup, and I saw some people suggesting to
          flush the output streams with ( out.flush()).
          But this is weird, doesn't Weblogic flush the output streams by itself??
          I had the same application running on tomcat before and everything was
          fine, I didn't have to flush the output streams with tomcat
          And what is the consequence of not flushing the output streams.
          Thanks guys
          Itani
          [att1.html]


I have the same problem. I have seen a lot of messages reporting this
          problem... what is the right solution? Can weblogic become instable
          due to this condition?
          I use some Oreilly classes (com.oreilly.servlet.MultipartRequest) to
          intercept some POST data; Is there anyone who knows if these classes
          can cause the ProtocolException problem?
          Bye
          Luca
          "Vinod Mehra" <[email protected]> wrote in message news:<[email protected]>...
          > No flush will not help here.
          >
          > This exception will show up in only two cases:
          >
          > 1. You wrote less than the promised content length was.
          >
          > 2. While you were writing the client terminated the connection. I
          > remember we used
          > to throw this ProtocolException exception at the end, which was
          > unnecessary.
          > I know this problem has been fixed. We don't throw this exception
          > anymore
          > when the client abnormally terminates the connection. I believe the
          > problem has
          > been fixed in 610sp2. Which release/service pack are you using? If
          > you
          > can't upgrade and need a one off patch please contact support.
          > CR057091
          > was used to track this problem. One off patches are available for
          > 610sp1 and
          > 510sp12.
          >
          > Cheers!
          > --Vinod.
          > "Mohamed Itani" <[email protected]> wrote in message
          > news:[email protected]...
          > Hello,
          > I was a getting a harmlous excpetion :
          >
          > <4/06/2002 16:48:04> <Error> <HTTP> <Servlet execution in servlet
          > context "WebAppServletContext(5985988,root,/root)" failed,
          > java.net.ProtocolException: Didn't meet stated Content-Length, wrote:
          > '7358
          > 4' bytes instead of stated: '94440' bytes.
          > java.net.ProtocolException: Didn't meet stated Content-Length, wrote:
          > '73584' bytes instead of stated: '94440' bytes.
          > at
          > weblogic.servlet.internal.ServletOutputStreamImpl.finish(ServletOutputStr
          > eamImpl.java:413)
          > at
          > weblogic.servlet.internal.ServletResponseImpl.send(ServletResponseImpl.ja
          > va:974)
          > at
          > weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.j
          > ava:1964)
          > at
          > weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137)
          > at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
          >
          > I read about it on this newsgroup, and I saw some people suggesting to
          > flush the output streams with ( out.flush()).
          >
          > But this is weird, doesn't Weblogic flush the output streams by
          > itself??
          > I had the same application running on tomcat before and everything was
          > fine, I didn't have to flush the output streams with tomcat
          >
          > And what is the consequence of not flushing the output streams.
          >
          > Thanks guys
          > Itani
          >
          >
          >
          > --

Not able to flush the data output stream in n/w prg.

Hi,
I am trying to send and receive the data using TCP/IP channel using socket programming.
Following is the server side code I have
Socket socket = server_socket.accept();
OutputStream output = socket.getOutputStream();
BufferedReader input = new BufferedReader(new InputStreamReader(socket.getInputStream()));
String inputMessage = (String) input.readLine();
System.out.println(inputMessage);
output.write("Message from server");
output.flush();I am able to receive the message from the client and as per the code the message is getting printed in the console. But I am unable to send the message back to the Client inspite of flushing the output stream.
I am sure that the problem is because of the flush method which is not acutally flushing the data. If I use the "println" method instead of the write & flush method, everything seems to be working fine. I do not want to use the "println" method because I get an extra new line character in the msg I send to the Client.
Any help on this is appreciated!

No. I am not using BufferedReader to listen for the server response. Given below is my client side code.
Socket socket = new Socket(<ip>, <port>);
InputStream input = socket.getInputStream();
PrintWriter output = new PrintWriter(socket.getOutputStream(),true);
output.println("Request from the client");
System.out.println("Waiting for the server response...");
byte buffer[] = new byte[2000];
input.read(buffer);
System.out.println(new String(byte));I am not receiving the message from server, it hangs on "Waiting for the server response..".

Getting the Output Stream of a Process without exec()ing it first.

Hi there,
I am writing a java application which needs to open another application "gnuplot". Now my operating system is windows and I open pgnuplot .
Also I want to send input to the above gnuplot (say plot sin(x) ) via the outputStream. The following is what I do :-
     String gnuplot_cmd = "plot sin(x)\n" ;
          Process p = Runtime.getRuntime().exec("C:/gnuplot/gnuplot4/bin/pgnuplot.exe");
          PrintWriter gp = new PrintWriter(p.getOutputStream());
          gp.print(gnuplot_cmd);
          gp.close();
But the above doesn't work fully , in that only the blank wgnuplot terminal window pops up however I am unable to direct input to the gnuplot application.
The reason being that , pgnuplot checks for
its stdin being redirected the moment it's started. If, at that time,
the "PrintWriter" is not yet connected to the OutputStream of the
process, that check will fail, and pgnuplot will revert to just executing
wgnuplot, without any command line redirection.
I am facing a problem of how to attach a OutputStream to the process, without getting exec()ing the process.
Is there anyway at all, i can get a process without starting it, so that I can attach an output Stream to it before it gets executed?
I am open to work arounds, anything that will automate the process of writing to the gnuplot terminal.
thanks!
nandita.

The reason being that , pgnuplot checks for
its stdin being redirected the moment it's started.
If, at that time,
the "PrintWriter" is not yet connected to the
OutputStream of the
process, that check will fail, and pgnuplot will
revert to just executing
wgnuplot, without any command line redirection. I'm not convinced this analysis is correct. gnuplot doesn't need to know that there's a PrintWriter there, and it probably can't know. It just needs to know whether its standard input is coming from console or not. The Java library code that can invoke processes probably handles the redirect right away, and that's why there's the OutputStream available even before you create the PrintWriter.
exec can be tricky. I think the problem may be that you're not dealing with standard output or standard error. Read this:
When Runtime Exec Won't
If that still doesn't help, there may be options to gnuplot to tell it exactly where its input is coming from.

How can I put an output stream (HTML) from a remote process on my JSF page

Hello,
I've a question if someone could help.
I have a jsf application that need to execute some remote stuff on a different process (it is a SAS application). This remote process produces in output an html table that I want to display in my jsf page.
So I use a socket SAS class for setting up a server socket in a separate thread. The primary use of this class is to setup a socket listener, submit a command to a remote process (such as SAS) to generate a data stream (such as HTML or graphics) back to the listening socket, and then write the contents of the stream back to the servlet stream.
Now the problem is that I loose my jsf page at all. I need a suggestion if some one would help, to understand how can I use this html datastream without writing on my Servlet output stream.
Thank you in advance
A.
Just if you want to look at the details .....
// Create the remote model
com.sas.sasserver.submit.SubmitInterface si =
(com.sas.sasserver.submit.SubmitInterface)
rocf.newInstance(com.sas.sasserver.submit.SubmitInterface.class, connection);
// Create a work dataset
String stmt = "data work.foo;input field1 $ field2 $;cards;\na b\nc d\n;run;";
si.setProgramText(stmt);
// Setup our socket listener and get the port that it is bound to
com.sas.servlet.util.SocketListener socket =
new com.sas.servlet.util.SocketListener();
int port = socket.setup();
socket.start();
// Get the localhost name
String localhost = (java.net.InetAddress.getLocalHost()).getHostAddress();
stmt = "filename sock SOCKET '" + localhost + ":" + port + "';";
si.setProgramText(stmt);
// Setup the ods options
stmt = "ods html body=sock style=brick;";
si.setProgramText(stmt);
// Print the dataset
stmt = "proc print data=work.foo;run;";
si.setProgramText(stmt);
// Close
stmt = "ods html close;run;";
si.setProgramText(stmt);
// get my output stream
context = FacesContext.getCurrentInstance();
HttpServletResponse response = (HttpServletResponse) context.getExternalContext().getResponse();
ServletOutputStream out = response.getOutputStream();
// Write the data from the socket to the response
socket.write(out);
// Close the socket listener
socket.close();

The system exec function is on the Communication palette. Its for executing system commands. On my Win2K system, the help for FTP is:
"Ftp
Transfers files to and from a computer running an FTP server service (sometimes called a daemon). Ftp can be used interactively. Click ftp commands in the Related Topics list for a description of available ftp subcommands. This command is available only if the TCP/IP protocol has been installed. Ftp is a service, that, once started, creates a sub-environment in which you can use ftp commands, and from which you can return to the Windows 2000 command prompt by typing the quit subcommand. When the ftp sub-environment is running, it is indicated by the ftp command prompt.
ftp [-v] [-n] [-i] [-d] [-g]
[-s:filename] [-a] [-w:windowsize] [computer]
Parameters
-v
Suppresses display of remote server responses.
-n
Suppresses autologin upon initial connection.
-i
Turns off interactive prompting during multiple file transfers.
-d
Enables debugging, displaying all ftp commands passed between the client and server.
-g
Disables file name globbing, which permits the use of wildcard characters (* and ?) in local file and path names. (See the glob command in the online Command Reference.)
-s:filename
Specifies a text file containing ftp commands; the commands automatically run after ftp starts. No spaces are allowed in this parameter. Use this switch instead of redirection (>).
-a
Use any local interface when binding data connection.
-w:windowsize
Overrides the default transfer buffer size of 4096.
computer
Specifies the computer name or IP address of the remote computer to connect to. The computer, if specified, must be the last paramete
r on the line."
I use tftp all of the time to transfer files in a similar manner. Test the transfer from the Windows command line and copy it into a VI. Pass the command line to system exec and wait until it's done.

Error flushing the output stream in Sun One server

Hi All,
I was running my servlet code in iPlanet 6.0 version and it was working fine. I upgraded my web server to new Sun One server (Oracle-iPlanet-Web-Server-7.0.9). With the new web server almost 90% of my application works fine, but there is a features in my application to download an Excel sheet by clicking a button. This feature is failing in new Sun One web server.
Below are my piece of code and the error log I m getting. Can anyone tell me how I can fix this error, I mean is there any web server specific change or configuration parameter need to be set.
Please ask for any information regarding my server configuration settings if needed for finding a solution for this
Code:
byte abyte0[] = new byte[1024];
BufferedInputStream bufferedinputstream=null;
BufferedOutputStream bufferedoutputstream=null;
java.io.InputStream inputstream = httpurlconnection.getInputStream();
bufferedinputstream = new BufferedInputStream(inputstream);
bufferedoutputstream = new BufferedOutputStream(httpservletresponse.getOutputStream());
int j;
long byteCount=0;
while((j = bufferedinputstream.read(abyte0, 0, 1024)) != -1)
byteCount=byteCount+j;
if(logger != null && logger.traceOn())
logger.log("total"+byteCount);
logger.log("Read bytes:"+j);
bufferedoutputstream.write(abyte0, 0, j);
if(logger != null && logger.traceOn())
logger.log("Wrote bytes:"+j);
bufferedoutputstream.flush(); // <<<<<< ERROR POINT >>>>>>
Error Log :
ClientAbortException: java.io.IOException: WEB8004: Error flushing the output stream
at org.apache.coyote.tomcat5.OutputBuffer.doFlush(OutputBuffer.java:343)
at org.apache.coyote.tomcat5.OutputBuffer.flush(OutputBuffer.java:313)
at org.apache.coyote.tomcat5.CoyoteOutputStream.flush(CoyoteOutputStream.java:147)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:124)
at com.reuters.bdec.as.ASRequestHandler.processResponse(ASRequestHandler.java:285)
at com.reuters.bdec.as.ASRequestHandler.initiateGetRequest(ASRequestHandler.java:89)
at com.reuters.bdec.as.ASRequestHandler.proceedToDestination(ASRequestHandler.java:220)
at com.reuters.bdec.as.ASExtension.authorisationCheck(ASExtension.java:84)
at com.reuters.bdec.as.ASExtension.doGet(ASExtension.java:114)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:794)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:915)
at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:398)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:277)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:255)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:586)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:556)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:187)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:586)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:556)
at com.sun.webserver.connector.nsapi.NSAPIProcessor.service(NSAPIProcessor.java:160)
Caused by: java.io.IOException: WEB8004: Error flushing the output stream
at com.sun.webserver.connector.nsapi.NSAPIProcessor.action(NSAPIProcessor.java:243)
at org.apache.coyote.Response.action(Response.java:197)
at org.apache.coyote.tomcat5.OutputBuffer.doFlush(OutputBuffer.java:339)
... 20 more

Don't flush it yourself. The servlet container will automatically flush for you once its send buffer is full. You can change the size of the send buffer though.

Questions about input/output streams

In the following tutorial:
http://chortle.ccsu.ctstateu.edu/CS151/Notes/chap85/ch85_10.html
It mentions that some methods, such as write(), writeByte(), writeBytes(), and writeChar(), return the low eight bits of the argument to the output stream. I am a little unsure of what exactly that means, might somebody be able to clarify for me?
In addition, I've been encountering the flush() method in some of the byte- and character-streaming objects that deal with buffers. What exactly is the flush() method's purpose, and when might it be used? Thank you.

flush pushes the data out of the buffer. the write methods write to the buffer, when the buffer is full, it flushes itself (usually), or it could block the write methods (in theory). flush just lets you make sure that it's flushed.
I'm not sure there's any reason to worry about high and low bytes in Java most of the time. I suppose, like anything, there's times you need to, but I can't think of any offhand.

Exception writing binary data to the output stream to client -Broken pipe

Hi,
I am trying to use the drag & drop feature using Contributor mode of Webcenter sites. Single Image Page Attribute is working properly where as Multiple Image Page Attribute throws the following error:
[ERROR] [.kernel.Default (self-tuning)'] [logging.cs.satellite.request] Exception writing binary data to the output stream to client 10.191.117.106
java.net.SocketException: Broken pipe
     at java.net.SocketOutputStream.socketWrite0(Native Method)
     at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
     at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
     at weblogic.servlet.internal.ChunkOutput.writeChunkTransfer(ChunkOutput.java:568)
     at weblogic.servlet.internal.ChunkOutput.writeChunks(ChunkOutput.java:539)
     at weblogic.servlet.internal.ChunkOutput.flush(ChunkOutput.java:427)
     at weblogic.servlet.internal.ChunkOutput$2.checkForFlush(ChunkOutput.java:648)
     at weblogic.servlet.internal.ChunkOutput.write(ChunkOutput.java:333)
     at weblogic.servlet.internal.ChunkOutputWrapper.write(ChunkOutputWrapper.java:148)
     at weblogic.servlet.internal.ServletOutputStreamImpl.write(ServletOutputStreamImpl.java:148)
     at COM.FutureTense.Servlet.ServletRequest$OutputOutputStream.write(ServletRequest.java:80)
     at COM.FutureTense.Servlet.ServletRequest.write(ServletRequest.java:1633)
     at com.openmarket.Satellite.RequestContext.write(RequestContext.java:1123)
     at com.openmarket.Satellite.BytePiece.stream(DataPiece.java:253)
     at com.openmarket.Satellite.CacheObjectImpl.stream(CacheObjectImpl.java:651)
     at com.openmarket.Satellite.Http11Responder.respondForWrapper(Http11Responder.java:142)
     at com.openmarket.Satellite.WrapperAwareResponder.respond(WrapperAwareResponder.java:36)
     at com.openmarket.Satellite.SatelliteServer.execute(SatelliteServer.java:85)
     at com.openmarket.Satellite.servlet.BaseServlet.doGet(BaseServlet.java:118)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301)
     at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at com.fatwire.wem.sso.cas.filter.CASFilter.doFilter(CASFilter.java:557)
     at com.fatwire.wem.sso.SSOFilter.doFilter(SSOFilter.java:51)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3730)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3696)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
     at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
     at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2273)
     at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)
     at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1490)
     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)
     at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)
Thanks
KarthiK

Thank u very much,
     FileOutputStream opGif = new FileOutputStream(destFile, false);
I have changed above line with the following line:
     PrintWriter opGif = new PrintWriter ( new FileWriter(destFile, false));
and now this code is working very fine.
Thanks once again...

Facing error in creating ObjectInput/output stream socket

hi I am Jatandar and i am implemeint client server program which will be using object Input/Output stream to pass data through sockets . The problem is the i m getting error when the cleint connects to the server here is the server and client code , YOur help will be appreciated
Inventory class with serializable has been implemented
public class Client
public static void main( String [] args )//throws IOException
Inventory invt[];
try
Socket serv = new Socket( "localhost", 8000 );
// connect to server at port 8000
          ObjectInputStream ois ;
ois= new ObjectInputStream(serv.getInputStream());
invt=(Inventory[]) ois.readObject() ;
System.out.println(invt[0]);
catch(IOException e )
System.out.println(" no server Found \n");
catch(Exception e)
System.out.println(e);
public class A3Server
     public static void main(String arg[] ) throws IOException
          //create a Server Socet
          ServerSocket ss= new ServerSocket(8000) ;
          ObjectOutputStream oos;
          //create a clent Socker that will listen for connection
          //listen for the connection from client
          BufferedReader br=null;
          FileReader fr=null;
          LinkedList ll=new LinkedList();
          StringTokenizer stkr;
          int i=0;
          Inventory inv=new Inventory();
          Inventory invt[];
          String t[]=new String[5];
          boolean choice=true;
          String temp="",temp2;
// i am reading a text which contain data
//that data is stored in invt []
//that array is transfered to clien t when it is connected
     Socket toClient= ss.accept();
oos = new ObjectOutputStream(toClient.getOutputStream());
oos.writeObject(invt );
     oos.close();
          }// end of main fucniton
     }//end of Server class
DETAIL OF ERROR
error in natived socket write method

hi I am Jatandar and i am implemeint client server program which will be using object Input/Output stream to pass data through sockets . The problem is the i m getting error when the cleint connects to the server here is the server and client code , YOur help will be appreciated
Inventory class with serializable has been implemented
public class Client
public static void main( String [] args )//throws IOException
Inventory invt[];
try
Socket serv = new Socket( "localhost", 8000 );
// connect to server at port 8000
          ObjectInputStream ois ;
ois= new ObjectInputStream(serv.getInputStream());
invt=(Inventory[]) ois.readObject() ;
System.out.println(invt[0]);
catch(IOException e )
System.out.println(" no server Found \n");
catch(Exception e)
System.out.println(e);
public class A3Server
     public static void main(String arg[] ) throws IOException
          //create a Server Socet
          ServerSocket ss= new ServerSocket(8000) ;
          ObjectOutputStream oos;
          //create a clent Socker that will listen for connection
          //listen for the connection from client
          BufferedReader br=null;
          FileReader fr=null;
          LinkedList ll=new LinkedList();
          StringTokenizer stkr;
          int i=0;
          Inventory inv=new Inventory();
          Inventory invt[];
          String t[]=new String[5];
          boolean choice=true;
          String temp="",temp2;
// i am reading a text which contain data
//that data is stored in invt []
//that array is transfered to clien t when it is connected
     Socket toClient= ss.accept();
oos = new ObjectOutputStream(toClient.getOutputStream());
oos.writeObject(invt );
     oos.close();
          }// end of main fucniton
     }//end of Server class
DETAIL OF ERROR
error in natived socket write method

How to print an output stream on console.

Hi,
I am new to JAVA. I am trying to execute a command in runtime and I want to print the output on console and also redirect the output to a file.
Could anyone please help me?
This is what I wrote :
Runtime rt = Runtime.getRuntime();
Process proc = rt.exec("cmd /c ipconfig");I am getting an output stream by : proc.getOutputStream(). I dont know how to print it on console and also how to redirect it to a file.
Could anyone please help me.
Thanks in advance.
Basav

You can do it this way :-
     public static void main(String args[]) throws Exception {
          ProcessBuilder builder = new ProcessBuilder("ipconfig", "/all");
          Process process = builder.start();
          BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
          FileWriter writer = new FileWriter(new File("C:/ipconfig.txt"));
          String str;
          while ((str = reader.readLine()) != null) {
               System.out.println(str);
               writer.write(str + System.getProperty("line.separator"));
          writer.close();
          reader.close();
     }Let me know if it works for you.

Java Input and Output streams

I have maybe simple question, but I can`t really understand how to figure out this problem.
I have 2 applications(one on mobile phone J2ME, one on computer J2SE). They commuinicate with Input and Output Streams. Everything is ok, but all communication is in sequence, for example,
from mobile phone:
out.writeUTF("GETIMAGE")
getImage();
form computer:
reply = in.readUTF();
if(reply.equals("GETIMAGE")) sendimage()
But I need to include one simple thing in my applications - when phone rings there is function in MIDlet - pauseApp() and i need to send some signal to Computer when it happens. But how can i catch this signal in J2SE, because mayble phone rings when computer is sending byte array? and then suddnely it receives command "RINGING"....?
Please explain how to correcly solve such problem?
Thanks,
Ervins

Eh?
TCP/IP is not a multiplexed protocol. And why would you need threads or polling to decipher a record-oriented input stream?
Just send your images in packets with a type byte (1=command, 2=image, &c) and a packet length word. At the receiver:
int type = dataInputStream.read();
int length = dataInputStream.readInt();
byte[] buffer = new byte[length];
int count, read = 0;
while ((count = dataInputStream.read(buffer,count,buffer.length)) > 0)
read += count;
// At this point we either have:
// type == -1 || count = -1 => EOF
// or count > 0, type >= 0, and buffer contains the entire packet.
switch (type)
case -1:
// EOF, not shown
break;
case COMMAND: // assuming a manifest constant somewhere
// process incoming command
break;
case IMAGE:
// process or continue to process incoming image
break;
}No threads, no polling, and nuthin' up my sleeve.
Modulo bugs.

How to read unix standrad pipe output stream

I want to write some code that will read data from a standard solaris pipe output stream. Please help.
For example
I cat a file in a unix shell
cat /etc/hosts
The output of this file can be piped to another program and I want to write a piece of code that reads that piped data and puts it into a textArea.
Thanks

Here ya go bro.................
This just checks if IO is coming in and if so prints it to the term, but
you get the idea.
There might be an better way but...........
import java.io.*;
class xxx
public static void main(String args[])
byte b[] = new byte[256];
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
if(System.in.available() > 0) {
System.in.read(b);
baos.write(b,0,256);
System.out.println(baos.toString());
else
System.out.println("No pipe being layed");
catch(Throwable t){}

Weird network output streaming....

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