Problem reading object via sockets

Hi All
I've the following class which I initialize and sent to differnet clients:
public class ParameterDisplay implements Serializable {
     public int current;
     public int[][][] deck = null;
     public int[][][] onTable;
     public String names[];
     public int human = -1;
     public int[] length;
     public int[] tlength;
     public int centerImg = -1;
     public ParameterDisplay() {}
}The problem is that when a client reads this object all information in deck is lost!!!!
The array names is ok
Any suggestions what is the problem here???
Thanks in advance
Luca

Hi
I've rewritten some code and the problem didn't occure this time??!!
Futhermore there is too much code to show here, also to many places where it might go wrong I think.
So what I will do now is, rebuild the program an keep an eye on the Socket part during the whole process!!
Luca
ps writing games isn't so easy as I expected :)

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Cannot send and read objects through sockets

I have these 4 classes to send objects through sockets. Message and Respond classes are just for
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the code just does not send the objects. I used object input and output streams to send and read objects
in server (SOTServer) and in the client (SOTC) classes. When I execevute the server and client I can see
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thanks.
ASAP pls
//***********************************Message class**********************
import java.io.Serializable;
public class Message implements Serializable
private String chat;
private int client;
public Message(String s,int c)
client=c;
chat=s;
public Message()
client=0;
chat="aaaaa";
public int getClient()
return client;
public String getChat()
return chat;
//*******************************respond class*****************************
import java.io.Serializable;
public class Respond implements Serializable
private int toClient;
private String s;
public Respond()
public Respond(String s)
this.s=s;
public int gettoClient()
return toClient;
public String getMessage()
return s;
//***********************************SOTServer*********************
import java.io.*;
import java.net.*;
import java.util.Vector;
//private class
class ClientWorker extends Thread
private Socket client;
private ObjectInputStream objectinputstream;
private ObjectOutputStream objectoutputstream;
private SOTServer server;
ClientWorker(Socket socket, SOTServer ser)
client = socket;
server = ser;
System.out.println ("new client connected");
try
objectinputstream=new ObjectInputStream(client.getInputStream());
objectoutputstream=new ObjectOutputStream(client.getOutputStream());
catch(Exception e){}
public void sendToClient(Respond s)
try
objectoutputstream.writeObject(s);
objectoutputstream.flush();
catch(IOException e)
e.printStackTrace();
public void run()
do
Message fromClient;
try
fromClient =(Message) objectinputstream.readObject();
System.out.println (fromClient.getChat());
Respond r=new Respond();
server.sendMessageToAllClients(r);
System.out.println ("send all completed");
catch(ClassNotFoundException e){e.printStackTrace();}
catch(IOException ioexception1)
ioexception1.printStackTrace();
break;
Respond k=new Respond();
sendToClient(k);
}while(true);
public class SOTServer
ServerSocket server;
Vector clients;
public static void main(String args[]) throws IOException
SOTServer sotserver = new SOTServer();
sotserver.listenSocket();
SOTServer()
clients = new Vector();
System.out.println ("Server created");
public void sendMessageToAllClients(Respond str)
System.out.println ("sendToallclient");
ClientWorker client;
for (int i = 0; i < clients.size(); i++)
client = (ClientWorker) (clients.elementAt(i));
client.sendToClient(str);
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try
System.out.println ("listening socket");
server = new ServerSocket(4444, 6);
catch(IOException ioexception)
ioexception.printStackTrace();
do
try
ClientWorker clientworker=new ClientWorker(server.accept(), this);
clients.add(clientworker);
clientworker.start();
catch(IOException ioexception1)
ioexception1.printStackTrace();
while(true);
protected void finalize()
try
server.close();
catch(IOException ioexception)
ioexception.printStackTrace();
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import java.io.*;
import java.net.Socket;
import java.net.UnknownHostException;
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private Socket socket;
private ObjectOutputStream output;
private ObjectInputStream input;
public void start()
try
socket= new Socket("127.0.0.1",4444);
input= new ObjectInputStream(socket.getInputStream());
output= new ObjectOutputStream(socket.getOutputStream());
catch(IOException e){e.printStackTrace();}
Thread outputThread= new Thread(this);
outputThread.start();
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try
do
Message m=new Message("sadfsa",0);
output.writeObject(m);
Respond fromServer=null;
fromServer=(Respond)input.readObject();
}while(true);
catch(NullPointerException e){run();}
catch(Exception e){e.printStackTrace();}
public SOTC()
start();
public void sendMessage(Message re)
try
Message k=new Message("sdasd",0);
output.writeObject(k);
output.flush();
catch(Exception ioexception)
ioexception.printStackTrace();
System.exit(-1);
public static void main(String args[])
SOTC sotclient = new SOTC();
try
System.out.println("client obje sonrasi main");
Message re=new Message("client ım ben mesaj bu da iste",0);
sotclient.sendMessage(re);
System.out.println ("client gonderdi mesaji");
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ObjectStreams send a few bytes at construct time. The OutputStream writes a header and the InputStram reads them. The InputStream constrcutor will not return until oit reads that header. Your code is probably hanging in the InputStream constrcutor. (try and verify that by getting a thread dump)
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Hi i am trying to read objects from i file i have
written them to but cannot seem to get it goint any
suggestions here are two errors but i am sure their
are more
---------- javac ----------
C:\university_class_work\cosc1309\Assignments\Assignmen
1\Bin2Text.java:26: incompatible types
found : java.lang.Object
required: java.io.ObjectInputStream
while ((ins = ins.readObject()) != null) {
^I'm not sure what you're trying to do exactly, I think its retrieve the next object from ObjectInputStream, you'd probably want to use another variable of type Object
C:\university_class_work\cosc1309\Assignments\Assignmen
1\Bin2Text.java:32: cannot resolve symbol
symbol : method flush ()
location: class java.io.ObjectInputStream
ins.flush ();
^
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Output completed (1 sec consumed).
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import java.text.*;
import java.io.*;
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// Assignment1
// Created by dragon on Sun Mar 09 2003.
// Copyright (c) 2003 __MyCompanyName__. All rights
reserved.
public class Bin2Text implements Serializable {
public static void main(String[] args) throws
ws IOException{
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//PrintWriter out = null;
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StringTokenizer words = null;
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r (new BufferedWriter (new FileWriter ("out.txt")));
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Stream ("in.bin");
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Eater = new PizzaEater();
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xception message was: " +
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* Default constructor setting
ing NegativeNumberException to the default
* as specified by API reference Exception
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* a Constructor passing the number value of the
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I having problems reading an object using NIO APIs. I am end creating an Object and pass it through a socket. When I retrieve the data from the input stream within the socket I initialize a ByteBuffer by allocating a length. The problem is that there is NO way of knowing what to allocate that ByteBuffer when reading in the object. Below is within a method that allows me to read information from the socket.
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ByteArrayInputStream bis = new ByteArrayInputStream(b);
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Object obj = input.readObject();
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buffer.clear();
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Message returningMsg = communicate(receivedFromClient);
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Problem Reading mp3 fles on Mac OS X Snow Leopard

Hi
Am deploying an application to mac osx snow leopard. my application is suppose to accept files by drag drop / browse select. it supports mp3 files only. it is suppose to load mp3 files with sound object, and read the id3 data and populate in into data grid. it works fine on windows. mp3 loading does not work on mac. can some one please help. this is urgent. is there a issue with this for mac platform ?
i basically pass audiofile.nativePath to sound object via new URLREQUEST.

The problem with my application was due to few things that were wrong.
1. Loading Mp3 files vis fileobject.nativePath is incorrect way to load such resources. you must use fileobject.url instead.
2. Comparing for file type with logic such as :
if((j.type.toLowerCase())== FILETYPE)
will have issues on mac, because:
The file type.
In Windows or Linux, this property is the file extension. On the Macintosh, this property is the four-character file type, which is only used in Mac OS versions prior to Mac OS X. If the FileReference object was not populated, a call to get the value of this property returns null.
3. I need to set sandbox as “file system” to access the content of audio resource. The method is :”open FlexBuilder -> project -> Properties -> Flex Complier -> Additional Complier arguments -> add “-use-network=false” “.
Now my application works cross platform. Thanks to a outstanding support by the Adobe Air Support.
Especially: Michael

Passing Objects via Request

I have a very simple problem that is bugging me to death. I've created a simple logon page that authenticates against an ldap directory. Once the authentication has completed successfully I create a user detail object which. Upon success the action returns success and I need to pass that UserDetails object to the forwarding page to display the data. What is the best method to do this? Thanks for the help guys.

If you're forwarding from one view to another via navigation, then in the action that submits the form, store the object in the RequestMap or SessionMap:
FacesContext.getCurrentInstance().getExternalContext().getRequestMap().put(<name>,<object>);or
FacesContext.getCurrentInstance().getExternalContext().getSessionMap().put(<name>,<object>);You can then refer to this object via the expression #{requestScope.name} where name was the value you used when storing in the map.

Getting RuntimeException while sending a JMenu Object via http

Hello,
since Java 1.5.0 i use a mechanism, which transfers a JMenu from my servlet object to my applet object via http.
Now since 1.5.0_02 i get this Exception while doing it:
java.security.AccessControlException: access denied (java.lang.RuntimePermission accessClassInPackage.sun.swing)
Now there is nothing to find about this. Not here in the forums, neither in google or anywhere else.
My guess is, its a matter of deserialization of thoses Jmenus.
Anybody out there with the same problem?
Anybody knows how to solve this WITHOUT changes the policy?
thanks
steffan

The directory that contains msgsend.class (usually the current directory)
is not in your CLASSPATH setting. Be sure that "." is included as one of the
entries in CLASSPATH.

Visa read object difference parity setting for PC and TPC2012 device

Hello,
we found some difference between application running in PC and runing in TPC2012 device.
We tested modbus communication via RS485 (9600b/s, 8bits, parity even) between PLC(master) and TPC2012 (slave). We used Visa read object and set parity to Even via property node. From the PLC we sent request to device and in our application we only read the data from PLC and displayed it (8bytes) on sreen.
If we tested the application on PC everything worked fine. But if we compiled application and ran it in TPC2012 device the data was different (for example if I sent request from PLC to slave 05 03 00 01 00 01 crc crc on the TCP I saw 00 03 00 01 00 01 crc crc. The crc on TPC wasn't equal to crc on PLC.
We found that problem was in VISA read setiing for read data in TPC device. If we set parity to SPACE (instead of EVEN) then we read data correctly.
Modbus - Parity set for VISA read object:
Master PLC (even) - PC (even) -> visa read - data are equal
Master PLC (even) - TPC (even) -> visa read - data aren't equal
Master PLC (even) - TPC (space)-> visa read - data are equal
PC: Win XP SP2, LabView 8.5 with LabView TP module 8.5.
TPC2012: WinCE 5.0, NI visa 4.2, NI TPC Service 1.0.
Best regards,
Pavel Rucka.

I just found out that the VI for the currentmeasurement with the keithley 6517a has the same error but still works fine. Now I also tried to adjust the serial data bit and parity settings via the VISA configure serial port function but still no improvements.

How to get server data without reading from the socket stream?

My socket client checks for server messages through
            while (isRunning) { //listen for server events
                try {
                        Object o = readObject(socket); //wait for server message
                            tellListeners(socket, o);
                } catch (Exception e) {
                    System.err.println("ERROR SocketClient: "+e);
                    e.printStackTrace();
                try { sleep(1000); } catch (InterruptedException ie) { /* ignore */ }
            }//next client connectionwith readObject() being
    public Object readObject(Socket socket) throws ClassNotFoundException, IOException {
        Object result = null;
System.out.println("readObject("+socket+") ...");
        if (socket != null && socket.isConnected()) {
//            ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
            ObjectInputStream ois = new ObjectInputStream(new DataInputStream(socket.getInputStream()));
            try {
                result = ois.readObject();
            } finally {
//                socket.shutdownInput(); //closing of ois also closes socket!
    //            try { ois.close(); } catch (IOException ioe) { /* ignore */ }
        return result;
    }//readObject()Why does ois.readObject() block? I get problems with this as the main while loop (above) calls readObject() as it's the only way to get server messages. But if i want to implement a synchronous call in adition to this asynchronous architecture (call listeners), the readObject() call of the synchronous method comes to late as readObject() call of the main loop got called before and therefore also gets the result of the (later) synchronous call.
I tried fideling around with some state variables, but that's ugly and probably not thread safe. I'm looking for another solution to check messages from the server without reading data from the stream. is this possible?

A quick fix:
- Add a response code at the beginning of each message returned from the server indicating if the message is a synchronous response or a callback (asynch);
- Read all messages returned from the server in one thread and copy callback messages in a calback message queue and the synch responses in an synch responses queue;
- Modify your synchronous invocation to retrieve the response from the responses queue instead from the socket. Read the callback messages from the corresponding queue instead from the socket.
Also take a look at my website. I'm implementing an upgraded version of this idea.
Catalin Merfu
High Performance Java Networking
http://www.accendia.com

Not able to send euro character ' €' via socket

OS : Solaris - The solaris login profile is set with LC_CTYPE, LC_CTYPE, LC_LANG=ISO-8859-15 and we are able to see this when we run the set command and also locale in solaris.
JRE : 1.6
Application deployed in Weblogic 10.3
I m trying to send a euro character in java via socket, but in the receiving end not able to receive properly. Even I have to tried to set the Charset ( in the java code )
as ISO-8859-15 , but still it didn't work properly. Code snippet for the sample program to display euro symbol
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
public class Euro {
public static String createString( byte[] bytes, String enc )
String CResult = null;
try {
CResult = new String( bytes, enc );
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return CResult;
// ISO8859-15 is same as ISO8859-1 but with EUR character
public static String createStringISO8859_15( byte[] bytes )
String CResultISO = null;
CResultISO = new String( bytes, Charset.forName("ISO-8859-15" ));
return CResultISO;
public static void main(String[] args) throws Exception {
//String enc = "€";
byte[] iso8859_15 = { (byte) 0xA4 }; // euro sign
//byte[] iso8859_15 = "0xA4".getBytes(); // euro sign
/* String Cresult = Euro.createString (iso8859_15, enc);
System.out.println("createString Result : " + Cresult);*/
String CresultISO = Euro.createStringISO8859_15(iso8859_15);
System.out.println("createStringISO8859_15 Result : " + CresultISO);
When I 'm running the above code in windows it is working fine whereas in Solaris it is not working. The console just displays ?, rather than the actual '€' symbol. Is this a display problem in console of vt100 or porgramming? Kindly suggest. How to make this work in Solaris.

Please repost or edit that mess with {noformat}{noformat} tags and proper indenting so it can actually be read.
And then explain what sockets have to do with the price of fish.

Problem reading attached PDF files



Hello.
At my work, we use JavaMail (version 1.4.1) in server
programs, processing mails with attached files from customers. Mostly it is
TIFF images, but it can also be PDF
files, and the attached files are extracted and saved for further processing.
Sometimes, we have a problem, reading attached PDF
files. The files get saved, but is of size 0 bytes. If I forward it, however,
using an Outlook client, the forwarded item can be read by our JavaMail program, and files saved OK.
I have tried to forward it using JavaMail, but I cannot
compose the mail parts, that fails, however - of the same reasons: I cannot
read the them in:-)
It looks like it's when the mail is send from a Mac.
Anyway, the part to read is of content type "APPLICATION/APPLEFILE" whereas when it's forwarded, it's content
type is "APPLICATION/OCTET-STREAM"
The way, I read the part, is to check if the part is an
instance of an InputStream, and then saving into a byte array, like this:
h5. Object
obj = part.getContent();
if (obj instanceof
InputStream) {
InputStream
inStream = part.getInputStream();
byte[]
buffer = new byte[BUFFER_SIZE];
int
bytesRead;
BufferedOutputStream
outBufStream = new BufferedOutputStream(new FileOutputStream(attFileName));
while
((bytesRead = inStream.read(buffer)) != -1)
outBufStream.write(buffer,
0, bytesRead);
inStream.close();
h5. outBufStream.close();
Problem
is that .read() method always returns -1 when content type Is APPLICATION/APPLEFILE,
so a file of 0 bytes are created.
Interesting is perhaps, that debugging shows me that the
part instance of the InputStream actually is a
com.sun.mail.util.BASE64DecoderStream when it fails, and a
com.sun.mail.util.QPDecoderStream
when it works OK.
So I have this idea, that I's a certain type of decoder
stream we're missing? We use Java 1.6.0 update 10 and JavaMail 1.4.1. and since
we use java 1.6 we use the JAF framework from that one, I guess?
Hope you guys can help?
Thanks in advance, Per Jensen
[email protected]

We have two (MS Exchange) servers (from trace log):
Microsoft Exchange IMAP4rev1-server version 5.5.2650.23
Microsoft Exchange Server 2003 IMAP4rev1 server version 6.5.7226.0
- the first one is the one, we're using here, but I have tried on the other, newer version too, and it didn't help either.
But I've found out a couple of interesting things:
1: Debugging shows me, that the part instance of the InputStream actually is a com.sun.mail.util.BASE64DecoderStream when it fails, and if I forward the mail via Outlook as described earlier, and it can be read OK, the part is a com.sun.mail.util.QPDecoderStream instance.
2: I can save the WHOLE message to a file, using message.getInputStream(), and when I opens the file I can find the individual attachments - as well as the bodytext, if any - as they are separated with the disposition, mimetype and filename fields, showed as plain text. And the attachments are showed as blocks of characters; I guess it's the ascii character representation of the bytes. Here's a snippet, note the first two sentences. They seemes to be added, somehow, when I dump the message to file(?):
<START OF DUMPED FILE>
This message is in MIME format. Since your mail reader does not understand
this format, some or all of this message may not be legible.
------_=_NextPart_000_01C9A8A2.19479FE4
Content-Type: text/plain;
     charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
(The body text here)
------_=_NextPart_000_01C9A8A2.19479FE4
Content-Type: application/applefile;
     name="first_attachment.pdf"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
     filename="first_attachment.pdf"
AAUWAAACAAAAAAAAAAAAAAAAAAAAAAAAAAQAAAAIAAAASgAAABAAAAAJAAAAWgAAACAAAAADAAAA
egAAABAAAAABAAAAigAAI6IAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAA1NzE2NSBCTkhhdWcucGRmJVBERi0xLjMKJbe+raoKMSAwIG9iago8PAovVHlwZSAv
Q2F0YWxvZwovUGFnZXMgMiAwIFIKPj4KZW5kb2JqCjIgMCBvYmoKPDwKL1R5cGUgL1BhZ2VzCi9L
aWRzIFsgNCAwIFIgXQovQ291bnQgMQo+PgplbmRvYmoKMyAwIG9iago8PAovUHJvZHVjZXIgKEhh
...(and so on)
DMgMDAwMDAgbg0KMDAwMDAwNTM1NSAwMDAwMCBuDQowMDAwMDA2NTA5IDAwMDAwIG4NCjAwMDAw
MDc2NjUgMDAwMDAgbg0KdHJhaWxlcgo8PAovUm9vdCAxIDAgUgovSW5mbyAzIDAgUgovU2l6ZSAx
MQo+PgpzdGFydHhyZWYKODgyNAolJUVPRgo=
------_=_NextPart_000_01C9A8A2.19479FE4
Content-Type: application/applefile;
     name="second_attachment.pdf"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
     filename="second_attachment.pdf"
AAUWAAACAAAAAAAAAAAAAAAAAAAAAAAAAAQAAAAIAAAASgAAABAAAAAJAAAAWgAAACAAAAADAAAA
egAAABAAAAABAAAAigAAI9wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAA1NzE4MSBCTkhhdWcucGRmJVBERi0xLjMKJbe+raoKMSAwIG9iago8PAovVHlwZSAv
Q2F0YWxvZwovUGFnZXMgMiAwIFIKPj4KZW5kb2JqCjIgMCBvYmoKPDwKL1R5cGUgL1BhZ2VzCi9L
...(and so on)
<END OF DUMPED FILE>I understand that it's base64 encoded and must be decoded, and I have tried to copy/paste the blocks separately, run them through the com.sun.mail.util.BASE64DecoderStream, and saving them as PDF files, which works fine(!).
As the solution seems to be painfull: Parse the mail to find where the attachments starts and stops and saving them as files, I hope you guys can send me on the right track?
PS: The trace log when dumping the file shows everything OK, I think. Here's a bit of the log at the end of dumping the message:
(...)MTUgMDAwMDAgbg0KMDAwMDAwNTg2NyAwMDAwMCBuDQowMDAwMDA3MDIxIDAwMDAwIG4NCjAwMDAw
MDgxNzcgMDAwMDAgbg0KdHJhaWxlcgo8PAovUm9vdCAxIDAgUgovSW5mbyAzIDAgUgovU2l6ZSAx
MQo+PgpzdGFydHhyZWYKOTMzNgolJUVPRgo=
------_=_NextPart_000_01C9A8A2.19479FE4--
A10 OK FETCH fuldført.
A11 FETCH 1 (BODY[TEXT]<40336.16384>)
* 1 FETCH (BODY[TEXT]<40336> {0}
20/03-09 15:18:21,445 3 Done, writing bytes to ByteArrayOutputStream. Size: 40336 bytes (..common.mail.MailUtil.dumpMessageToFile.dumpMessageToFile)
20/03-09 15:18:21,445 3 Done, writing ByteArrayOutputStream to file. (..common.mail.MailUtil.dumpMessageToFile.dumpMessageToFile)
A11 OK FETCH fuldført.

Problem reading object via sockets

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