Socket

I have an application in which java program (client)communicates with IBM mainframe (server) using socket. when server writes about 16k data as reply, sometime java program receives all 16k data. sometimes it does not receive all data. After certain bytes ( the point where it occurs varies every time ) , it starts receiving nulls. Socket class is wrapped by a BufferedInputStream ( incase of output, it is BufferedOutputStraem). It works fine, as long as data size does not exceed 8k. But when I transmit beyond 8k from server, sparaodically client does not get all the transmitted data. My question is: In case of large data such as 16k, is there anything I need to take care of?

hi,
you can not assume, that all packets at the same arrive the client. so you have to wait until all data is received. if you get -1 from read() and you have not received all data you have to read() again and store the rest of the data.
hope it helps
Carsten

Similar Messages

Problem with socket and Threads

Hi,
I have coded a package that sends an sms via a gateway.
Here is what is happening:
* I create a singleton of my SMSModule.
* I create an sms object.
* I put the object in a Queue.
* I start a new Thread in my sms module that reads sms from queue.
* I connect to sms gateway.
* I send the sms.
* I disconnect from socket! This is where things go wrong and I get the following error (see below).
I have a zip file with the code so if you have time to take a look at it I would appreciate it.
Anyway all hints are appreciated!
//Mikael
GOT: !LogoffConf:
mSIP Kommando var: !LogoffConf
CoolFlix log: MSIPProtocolHandler;setLoggedin(false)
We got LogOffConf
Waiting ......for thread to die
java.net.SocketException: Socket operation on nonsocket: JVM_recv in
socket input stream read
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:116)
at
sun.nio.cs.StreamDecoder$CharsetSD.readBytes(StreamDecoder.java:405)

Off the top of my head, probably the garbage collector cleared your SMSModule coz all classes loaded through other classloaders will be unloaded when that classloader is unloaded.
mail in the code if you want me to look at it with greater detail.

Can i use the same socket to connect to more than one servers

hi,
I'm new to java. I want to know whether a socket created using Socket() constructor can be used to connect to multiple servers, not necessarily at a particular point of time. ie, i want to connect to various servers using a single socket and register some info abt them, possible using a loop, one by one. I use connect() method to connect to particular server.
In other words is Socket class is mutable.
Edited by: itsraja on Feb 25, 2008 5:50 AM

In short, I don't think so.
Setting the server name for a socket is in the constructor.
Socket s = new Socket("localhost", 501);I don't believe that there are any functions, such as:
s.setHost("localhost");
s.setPort(501);However, JavaDocs suggests that when you use the no-args constructor, your class becomes an automatic SocketImpl class, but you can't reach any of its variables unless you derive from the class, itself. But that's probably a bigger headache than it's worth.
Now TECHNICALY, if you didn't want to create a new variable, you could use:
Socket s = new Socket("localhost", 501);
s.close();
s = new Socket("remotehost", 502);
s.close();However, this is still creating a new instance and thus a new object in memory.
I hope this answers your question.
Let us know exactly what you're trying to do for a more exact answer.
~Derek

My iPod Touch will no longer charge from a wall socket, only my computer. HELP!

My 4th generation iPod Touch will no longer charge from a wall socket, only my computer. I tried buying a new cable and USB charging socket (and I bought one made by Apple), but that did not fix the problem. I restored it from iTunes, hoping that would work as well, but that failed. I am at my wit's end. Can anybody here help me? I've bought new equipment, tried rebooting, restoring, etc. but nothing so far has proven successful. If anyone's got a solution, please help!
Thanks!
Signed, a very frustrated iPod user in Ohio!
<Edited By Host>

All I can suggest is the standared fixes. It seems very strange
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Reset all settings
Go to Settings > General > Reset and tap Reset All Settings.
All your preferences and settings are reset. Information (such as contacts and calendars) and media (such as songs and videos) aren’t affected.
- Restore from backup. See:
iOS: How to back up
- Restore to factory settings/new iOS device.
If still problem, make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem. Bring the cable and Apple wall charger too.
Apple Retail Store - Genius Bar

MSI K7N2 Delta-ILSR Nforce2 (Socket A) Motherboard (MB-003-MS) Features NF2 chip

I tried to install 3 of the Crucial Ballistix Tracer (1 Gig Each) in this motherboard (MSI K7N2 Delta-ILSR Nforce2 (Socket A) Motherboard (MB-003-MS) Features NF2 chipset) and it will not run stabilly no matter what I tried. Is this a bios conflict with the memory? If so, are there any new bios updates? I have tried cas settings and voltage settings but nothing works. It will how ever run perfectly with only 2 sticks in single channel mode. It will not run same 2 sticks in dual channel mode. Anyone have any ideas? Anyone know of any new motherboards with maybe NFORCE 4 Chipset that support all 3 sticks of this memory and an AGP graphics card? Im thinking of a new motherboard but I still need to have AGP and SATA.
Barton 3200 core proc.
System has ran fine for a solid year until I tried new memory. Please help!

Quote from: freakytiki4u on 07-November-06, 23:42:33
Ok I tried to use relaxed FSB by -10 and relaxed mem timings but still unstable due to the motherboard trying to use dual channel memory. If you can modify the bios to where it will not have the capability of dual channel memory I truly believe it will work. Will u try this for me? I would greatly appreciate it as I am really not ready to spend all the money on new equipemtn when this suits my needs for now.
sure but as i said before this is gona be experimental and risky. Here we go:
MSI K7N2 Delta ILSR Experimental MOD E1(Disable Dual CH ability)
Procedure is automated in best possible safest way to BIOS update.
Prepare a blank diskette in a good condition(newest one etc.)
]execute file under XP will make bootdisk with automated BIOS update procedure. when diskette is ready, reboot PC and boot from FDD(floppy), wait a bit, then you will be asked for final confirmation about BIOS update process, press a key to proceed, after BIOS update is complete, ensure that you got successfully output message from flash program. then power down your PC, remove power cord from the PSU, hit power button several time to drain caps electrify, touch with hands some metal for ES discharge, and Clear CMOS.
pull back power cord, power up your PC, when you see CMOS checksum error,(expected msg) hit F1 to continue to re-build DMI pool data, then reboot and enter in BIOS, LOAD BIOS DEFAULT, and SAFE AND EXIT.
NOTE: Ensure your PC is stable before proceed with BIOS update.
NOTE: Use it at own risk, chance of failure is big, cannot guarantee results and safest as provisional mode which can guarantee it will work stable with features. also cannot test it personally before give you. (don't have mobo anymore)
Using it may end with dead mainboard (BIOS chip re-flash will be required, if somethink goes wrong)

When I try to log on to my ichat I get the error message "An undefined AIM socket error has occurred.". How do I resolve this?

The error message "An undefined AIM socket error has occurred." comes up when I try and log on to ichat.

I have the same issue. Does anybody know why this has happened

Assign unique id to client of socket server

HI
I am in the process of developing a xml socket server application and have hit on a problem. I have managed to create a server that listens for connections and once a request is recieved creates a new client on a seperate thread with the reference being stored in a vector in the server.
However I want to be able to assign an id to a client when it is created so that I can broadcast messages to specific users.

my apologies my question was poorly stated..
When i meant unique i mean that they will have already been prdefined i.e for example the following users
Name David
UserId *(Unique) 0138868
Name sarah
UserId *(Unique) 4138868
Name rob
UserId *(Unique) 7138868
what i want to be able to is when the users connect they can be refeneced by their Userid so that if rob wants to say something to sarah without david knowing. The problem I have is that I do not know how to provide the userid to the server such that the server can create a new client thread with a specified id.
Hope that makes sense ;>

Data written to socket getting lost? or perhaps out of order?

I'm trying to fix a bug in Flashmog. The bug is described in more detail here.
Basically what is happening is that my Flash client claims that it is calling functions that don't arrive at the server -- or they arrive, but the socket data is out of order and therefore is garbled. I've stared at the source code for hours and tried a lot of trial-and-error type stuff and added trace statements to see if I can find the problem and I'm not having any luck.
In particular, there's class I have called RPCSocket that extends the AS3 Socket class so I can serialize data structures before sending them across a socket. At one point, this RPCSocket class calls super.writeBytes and super.Flush. It is the point at which I send all data out of my client. The data is binary data in AMF3 format.
          public function executeRPC(serviceName:String, methodName:String, methodParams:Array):void {
               if (!this.connected) {
                    log.write('RPCSocket.executeRPC failed. ' + methodName + ' attempted on service ' + serviceName + ' while not connected', Log.HIGH);
                    throw new Error('RPCSocket.executeRPC failed. ' + methodName + ' attempted on service ' + serviceName + ' while not connected.');
                    return;
               var rpc:Array = new Array();
               rpc[0] = serviceName;
               rpc[1] = methodName;
               rpc[2] = methodParams;
               var serializedRPC:ByteArray = serialize(rpc);
               if (!serializedRPC) {
                    log.write('RPCSocket.executeRPC failed. Serialization failed for method ' + methodName + ' on service ' + serviceName, Log.HIGH);
                    dispatchEvent(new IOErrorEvent(IOErrorEvent.IO_ERROR, false, false, 'RPCSocket.executeRPC failed. Serialization failed for method ' + methodName + ' on service ' + serviceName));
               super.writeUnsignedInt(serializedRPC.length);
               super.writeBytes(serializedRPC);
               super.flush();
          } // executeRPC
Can someone recommend a way for me to store without corruption, conversion, or filtering or translation of any kind *all* of the information sent across this socket? I'd like to write it to a file. I'm guessing that keep a global ByteArray var and storing the info there might work, but I'm wondering how I might get the contents of that ByteArray into a file so I can inspect it.
Also, I'm wondering if I might be able to inspect what flash actually sends out on the socket? I have a sneaking suspicion that data I supply to super.writeBytes may be sent out of order or may not actually get sent across the socket. This bug I'm talking about only seems to happen under high-stress situations when I'm sending dozens of messages per second across this one socket.

oops...forgot link to bug description: http://flashmog.net/community/viewtopic.php?f=5&t=549

Socket connect slow in JDK 1.5?

We recently began testing our Java Swing application with JDK 1.5, and we noticed that socket.connect()
calls are taking several seconds to return, when before in 1.4 the calls returned immediately.
Here is some sample code:
Socket sock = new Socket();
InetSocketAddress sockAddr = new InetSocketAddress(inAddress, portNum);
sock.connect(sockAddr, 2000);
What could be wrong? I've debugged the code and verified inAddress is an IP address,
not a hostname.
-Eric

Here is the list of enhancements in JDK1.5.
http://java.sun.com/j2se/1.5.0/docs/guide/net/enhancements-1.5.0.html
I wonder if any of them are having some effect in the slow connection.
There are some network properties that you can tweak with. Did you try them?
Here is the list
http://java.sun.com/j2se/1.5.0/docs/guide/net/properties.html

Iphone 4 headphone socket not working headphones won't go all the way in

My iphone 4 headphone socket not working, the headphones won't go all the way in? any help, ideas?

I bough a new ipad two a few feels ago and still haven't managed to used any headphones with it.
It's very annoying as I'm currently in hospital and will be for a few more weeks and this being the reason I bought it!! Now I have to have it on very low volume and not use it in the evening

IPhone 4 ear speaker not working after 2 restores and cleaning the headphone socket.

Hi,
I know this problem is not uncommon, but here goes...
I have an iPhone 4 which was running iOS 5.1.1 a few days ago when the ear speaker stopped working. I cant hear the other person when I make or recieve a call, but nothing else is wrong with the phone. It is 18 months old.
I've searched the discussions and seen some of the suggestions. I tried cleaning out the headphone socket, with no luck. I then tried a full restore and update to iOS 6. This appeared to have worked. I tried 2 calls and I could hear the other person. I then left the phone alone for a couple of hours and when I tried it again, it had stopped working again.
I have since done another full restore but the speaker is still not working at all. The fact that it worked after the first restore suggests it's something simple or software related but I have no idea what else to try other than getting it repaired in a shop. The problem is I am in Japan where my network (Softbank) and an independent repair shop have both quoted me the equivalent of $176 / £110 to fix it.
Does anyone know anything else I can try before I give in and end up shelling out this ridiculous cost for something that is probably a 20 minute fix?
Any help would be appreciated.
Thanks

I have the exact same problem with my ear speaker after my IOS 6 upgrade. My speakers work, bluetooth works, the earphones work, but the ear speaker doesn’t work. I noticed this IMMEDIATELY after the upgrade was completed. I also have the following problems:
-Very slow call connect time. 30 - 45 seconds just to connect is typical. Signal strength is 5 bars (ATT)
-Problems attaching to known networks
-Very slow internet browsing with many timeouts on both the ATT 3G service and known Wi-Fi networks.
- My camera was missing after the IOS 6 upgrade. I restored that from Restrictions inside of the Settings App
- Music was so screwed up it was easier to just restore it
I went to the Apple store hoping to get some support. Between my wife, my son, and myself we have purchased 4 iPhones and an iPad over the last few years with plans to purchase another iPad in a month or so. So it’s not like I' not familiar with Apple Technology and their typical level of support.
The individual who waited on me was rude and condescending. He insisted that all of the problems were hardware related or ATT’s fault, or my fault. He further asserted that IOS 6 had NOTHING to do with any of the problems. I pointed out that it would be quite a coincidence for my hardware to break, for ATT to have network problems, and for me to suddenly forget how to use an iPhone at the same exact moment that IOS 6 had been installed. He maintained his position and offered to sell me another phone.
I don’t expect the folks in the store to reprogram the OS. Mistakes happen. I’m going to guess that Apple’s OS programmers are already working on a fix for many of the IOS 6 complaints that are easy to find on Google. Assigning blame to the customer and denying any responsibility is not a model for success or customer service. I’m sure Apple wouldn’t accept that kind of excuse from their component manufacturers and don’t think it is how they should deal with their customers. Further, Apple wants to own the device. They want to control the apps, the OS, battery, the delivery channel. I’m good with that so long as when there is a problem, they own that as well.
And BTW… I’m not including the maps in my list of issues with IOS 6 because I kind of like the new maps and am willing to give Apple the benefit of the doubt. I believe that their map service will get a lot better in a hurry.

K8neo 4 socket 939 cpu 3800 x2 amd what is the best hard disk

k8neo 4 socket 939 cpu 3800 x2 amd what is the best hard disk
for this confy
i know maxtor has more problem
so i ask to you
what is the best hard disk 250 300 gb ?
sata sata 2 ?
i read about in some site but i can understand what is the best for this confy
thank
my english is Lol

When we are talking about Quality and Performance the choice is:
http://www.wdraptorx.com

If I copy the "lcds" folder, Tomcat starts with socket errors

In the documentation it is said that when you create a new server-side application, you can start by copying the 'webapps/lcds' folder. I did that but then, Tomcat starts with some socket errors:
[LCDS]SocketServer 'my-rtmp-SocketServer' failed to pre-validate desired socket settings for BindSocketAddress: 0.0.0.0:2038
java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind
[LCDS]SocketServer 'my-rtmp-SocketServer' failed to start.
flex.messaging.LocalizedException: SocketServer 'my-rtmp-SocketServer' cannot bind to accept client connections on port '2038' because another process has already bound the port. Please ensure that multiple endpoints across all applications are not configured to use this same port.
Am I doing something wrong?
Thanks,
Borek

What is happening is that you are getting a port conflict for the socket-based NIO and RTMP endpoints used in the channel definitions in the services-config.xml file of your new web app. The issue is that you have endpoints bound to the same port in the LCDS web and in your new web app.
You can deal with this one of two ways:
Option 1: In that services-config.xml file, search on "RTMP" and "NIO" to find the channel definitions and change the port numbers to something slightly different than the ones used in the LCDS web app.
Options 2: Move the LCDS web app out of the picture so it doesn't get loaded, and just use a template for future web apps. If you aren't using it for any of your development, there is really no reason you have to load it.
I'll add a note about this to the documentation that talks about using the LCDS web app as a template.

Socket threads problem after SOA installation

Hi all,
I am getting below error after sending request to the server(after weblogic and SOA servers started properly.
<Warning><Socket>'There are: '5' active sockets, but the maximum number of
socket readers allowed by the configuration is: '4', you may want to alter
your configuration.>'
I am not able to deploy the application into the SOA Server(I am getting http response 502 error in my Jdeveloper's log).
I have seen forums about this ,they told to change the socket threads in weblogic console(mine is weblogic 10.3.5 server) ,but I am not able to change in the console.It has already some value as 33 and when I change and save ,it is telling value can not be changed dynamically.
I was told to change like below.But Where do I need to change like below and how
java -Dweblogic.ThreadPoolSize=10 -Dweblogic.ThreadPoolPercentSocketReaders=60 ... your.client ...
I am stuck(I am not able to deploy the applications into SOA server)
Thanks in advance

Hi
1. What you are seeing is <Warning> and mostly you can ignore this. This may not be the root cause for your error.
2. Can you access your soa server url from browser like http://soahost:soaport/bpm/workspace url should work. Try soahost with direct ip address or dns name of that machine.
3. In Jdeveloper, when you configure this, I hope you Tested the connection and does it show success.
4. One way to quickly test is, deploy the SOA Workflow JAR directly from EM Console. The .jar file should be under your soaproject/deploy folder. If you have EAR for TaskForms, deploy EAR also from Console or EM Console. If all this works, this means, JDeveloper is not able to connect to soa server. Search for Proxy settings forJDeveloper in this forum. I remember seeing some posts to enable/disable Proxy for Jdeveloper like that.
5. Look in the log files for any errors while deployment. But if server itself is NOT accessible, you may not see any deployment errors at all.
Thanks
Ravi Jegga

Socket-application (bouc. balls)

Hi,
I am trying to write an "bouncing balls" application. If you start it several times, all balls should be displayed at the same position (in every started window). How would the code look like, if you start with the folling source-code? (The following source-code demonstrates a simple implementation of the bouncing balls problem):
import java.awt.*;
import java.awt.event.*;
public class BounceSuspend extends Frame implements ActionListener
private Canvas canvas;
// store each thread in an array as it is created
private int maxthreads = 100;
private BallSuspend[] threadarray = new BallSuspend[maxthreads];
private int lastthread = -1;
// the constructor initializes the frame to be a borderlayout
// with a canvas in the center and
// four buttons labelled Start, Pause, Continue, and Close in the south
public BounceSuspend()
{ setLayout(new BorderLayout());
setTitle("BounceSuspend");
canvas = new Canvas();
add(canvas, BorderLayout.CENTER);
Panel p = new Panel();
Button b1 = new Button("Start");
b1.addActionListener(this);
p.add(b1);
Button b3 = new Button("Pause");
b3.addActionListener(this);
p.add(b3);
Button b4 = new Button("Continue");
b4.addActionListener(this);
p.add(b4);
Button b2 = new Button("Close");
b2.addActionListener(this);
p.add(b2);
add(p, BorderLayout.SOUTH);
// responds to the Start button by creating a new instance
// of the BallTimes class and starting its thread,
// stores each thread in an array of threads
// responds to the Pause button by calling thread method suspend
// on all the threads
// responds to the Continue button by calling thread method resume
// on all the threads
// responds to the Close button by exiting the application
public synchronized void actionPerformed(ActionEvent evt)
{ if (evt.getActionCommand().equals("Start"))
{ if (lastthread < (maxthreads - 1))
     { lastthread++;
BallSuspend b = new BallSuspend(canvas);
     threadarray[lastthread] = b;
b.start();
else if (evt.getActionCommand().equals("Pause"))
     for (int i = 0; i <= lastthread; i++)
     threadarray.threadSuspended = true;
else if (evt.getActionCommand().equals("Continue"))
     for (int i = 0; i <= lastthread; i++)
     { threadarray[i].threadSuspended = false;
     threadarray[i].notify();
else if (evt.getActionCommand().equals("Close"))
System.exit(0);
// the main method creates an instance of this class and sets the
// properties of the frame
public static void main(String[] args)
{ Frame f = new BouncePause();
f.setSize(400, 300);
f.setVisible(true);
/* The BallSuspend class is a subclass of Thread, so each instance inherits
* thread methods start, stop, sleep, etc.
* The run method of the thread loops to draw a ball in a new location
* for a fixed number of iterations.
* This example has an additional variable sleeptime, which is used to
* sleep inbetween iterations.
class BallSuspend extends Thread
private Canvas box;
private static final int XSIZE = 10;
private static final int YSIZE = 10;
private int x = 0;
private int y = 0;
private int dx = 2;
private int dy = 2;
private int sleeptime;
// thread suspension variable - accesses to this variable must be synchronized
boolean threadSuspended = false;
// the constructor initializes the canvas to that of the frame
// and initializes sleeptime to a random number between 4 and 44
public BallSuspend(Canvas c)
{ box = c;
sleeptime = ((int)(Math.random() * 40)) + 4;
// draws the ball in the current location
public void draw()
{ Graphics g = box.getGraphics();
g.fillOval(x, y, XSIZE, YSIZE);
g.dispose();
// increments the location of the ball, checks the boundary to see
// if it should "bounce", and draws the ball
public void move()
{ Graphics g = box.getGraphics();
g.setXORMode(box.getBackground());
g.fillOval(x, y, XSIZE, YSIZE);
x += dx;
y += dy;
Dimension d = box.getSize();
if (x < 0) { x = 0; dx = -dx; }
if (x + XSIZE >= d.width) { x = d.width - XSIZE; dx = -dx; }
if (y < 0) { y = 0; dy = -dy; }
if (y + YSIZE >= d.height) { y = d.height - YSIZE; dy = -dy; }
g.fillOval(x, y, XSIZE, YSIZE);
g.dispose();
public void run()
{ draw();
while(true)
{ move();
try
{ Thread.sleep(sleeptime);
if (threadSuspended)
synchronized(this)
{ while (threadSuspended)   wait(); }
} catch(InterruptedException e) {}

Are you using "Socket Programming" anywhere.
The first thing I would do is format the code.
DO you have any more questions?

Using socket and JMS protocol in the same logic for OSB

Hi frnds,
In my organization...the only communication protocol used is "socket" protocol. However, I want to use JMS protocol to process incoming messages. Can somebody help me figuring out how to go about it.
Using some nice OSB blogs, I am able to create the JMS connection factory and JMS queues in weblogic. And that works fine when I select the communication protocol as JMS while creating the BS and PS.
What should be my message flow when the communication protocol used is "socket" for both BS and PS.
salil

Hi,
Make the BS as JMS and the PS as socket, in the PS's flow do a route for the BS... Then if an external call is made to the PS via socket, it will send a messages to a JMS queue...
Hope this helps...
Cheers,
Vlad

Socket

Similar Messages

Maybe you are looking for