InputStream available() variance in functionality

We have a Webservice program which sends a SOAP request with OutputStream and captures the SOAP response with InputStream. We are using available() method of InputStream to fetch the input response. This method used to work correctly for the below OS and Java version
[user2@HENDRIX ~]$ java -version
java version "1.5.0_05"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_05-b05)
Java HotSpot(TM) 32-Bit Server VM (build 1.5.0_05-b05, mixed mode
We have upgraded the system to below version and the webservice program is stripping off the SOAP request to some extend and unable to fetch the full SOAP XML response
[user1@HERMES ~]$ java -version
java version "1.6.0_11"
Java(TM) SE Runtime Environment (build 1.6.0_11-b03)
Java HotSpot(TM) 64-Bit Server VM (build 11.0-b16, mixed mode)
But the same program without change in the code worked for earlier versions. Please let us know do we have any change in the available() method behaviour.

Sounds like you are expecting available() to return the length of the stream. It cannot be reliably used for this process and should never have been used in the first place. [available()|http://java.sun.com/j2se/1.4.2/docs/api/java/io/InputStream.html#available%28%29] return the number of bytes that can be read without blocking and says nothing about how may bytes the stream contains.

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Unable to understand InputStream.available() method, need some help

dear friends,
The following is my doubt. please kindly help me in this. this will help me a lot in understanding some consepts.
Environment: i am using jdk1.4.1_01 on windowsxp.
i am using IE6.0 to make requets.
My requirement:
what i am actually trying to do is i want to see the raw material
send by the browser when we made a request to the server
by the browser.basically i want to see the request line
and headers as it is that is send by the browser to the server.
so i thought to code a server that can print the request send
by the browser as it is on the command window.
i had taken two examples and i am running Server2.java (look at the bottom for this code)and i made a 25 requests to the server2 program
which is running on port 8080 by the browser. here only once or twice in 25
times i was able to see the requests send by the browser.i tried hard and
found that InputStream.available() method is returning 0 even though the
request is sucessfully send to the port 8080 that is to the server2 program
which is listening to port 8080.
so in this process of experimenting i took Server3.java(i am sending this file
also as an attachment) which is using multithreading. in this also i did modification
as i did in Server2.java. the thing is here i am able to succed. here
InputStream.available method is returning the correct number of bytes
that are arrived on the port and are available to the InputStream.here
when ever i made a request from the browser to Server3.java i am able to
see the raw data send by the browser without failure.
i could not understand why InputStream.available() is returning 0
often(not all the time) and why it is giving the desired result when i
used it in Server3.java ?
i looked into the documentation and it says " InputStream.available() Returns the number of bytes that can be read (or skipped over) from this input stream without blocking
by the next caller of a method for this input stream."
so the thing i could not understand is what is blocking the InputStream
in the first case.if i could undrstand the internals of how this
method is working it will help me a lot.if i could understand this i
will know what is the right situations to use this method.
Thanking You.
/*Shows how to develop a simple network server
Author : Team -J
Version : 1.0 */
import java.net.*;
import java.io.*;
class Server2{
static public void main(String[] args)throws Exception{
     // create a new Server Socket
     try{
          ServerSocket ss = new ServerSocket(8080,1);
     while(true){// set queue length to 1
          // wait for the connections
          Socket s = ss.accept();
          // get the output stream associated with socket
          // to write something to the socket
          PrintStream ps =new PrintStream( s.getOutputStream());
          InputStream is = s.getInputStream();
          ps.println("I am ready to provide xxx Service");
int len=is.available();
          if(len !=0)
          byte b [] = new byte[len];
          int k =is.read(b,0,(len-1));
          for(int i =0;i<k;i++)
               char c = (char)b;
               System.out.print(c);
          // close the connection
          is.close();
          s.close();
     }catch(Exception e){}
/*Shows how to develop a simple network server
Author : Team -J
Version : 1.0 */
import java.net.*;
import java.io.*;
class Server3{
static public void main(String[] args)throws Exception{
     // create a new Server Socket
     try{
          ServerSocket ss = new ServerSocket(8080,1);
          while(true){
               // wait for the connections
               Socket s = ss.accept();
               ServerThread st = new ServerThread(s);
               st.start();
     }catch(Exception e){}
class ServerThread extends Thread{
Socket s;
     public ServerThread(Socket s){
     this.s = s;
     public void run(){
          try{
          PrintStream ps =new PrintStream( s.getOutputStream());
          InputStream is = s.getInputStream();
          int len=is.available();
          ps.println("I am ready to provide xxx Service");
          if(len!=0)
          byte b [] = new byte[len];
          int k =is.read(b,0,(len-1));
          for(int i =0;i<k;i++)
               char c = (char)b[i];
               System.out.print(c);
          is.close();
          s.close();
          }catch(Exception e){}

so the thing i could not understand is what is
t is blocking the InputStream
in the first case.Blocking means the thread goes to sleep waiting for more data to arrive. InputStream.available() shows how many bytes have already arrived, not how many remain to be sent.

Is numlock still available in the Function keys (F1-F12)

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I'm not precisely sure about the situation with the ']' key. It sounds as if perhaps the keyboard doesn't match the language or region of the system. Without knowing more, the first place to go would be the Keyboard tab in the Keyboard preferences pane.
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!http://img228.imageshack.us/img228/5186/scottdartve1.png!

How to override InputStream.available()

Hi,
InputStream.available() always returns zero.
now i have a requirement where I want to know total size of data in an InputStream.
Note: I don't want to read all the data byte by byte into an byte[] etc etc.
the reason is that data can be huge and i don't want to keep it in memory.
Regards
Apratim

I'm glad you don't want to keep huge amounts of data in memory but I would consider 512Mb as huge myself.
To override InputStream.available() all you have to do is override InputStream.available(). But if the information you want isn't available, tough.
FileInputStream.available() returns the length of the unread portion of the file, although I don't rely on it personally. Various other implementations of available() return zero. For example, SSLSocket.getInputStream().available(), because the stream can't know without decrypting, and it mightn't have an entire cipher block to decrypt, and you wouldn't want it to block getting the rest of the cipher block so it could decrypt so it could tell you how much data was available without blocking, so what else can it do?

InputStream.available()

Hi,
InputStream is = socket.getInputStream();
int n = is.available();
n don't return number of bytes available in the InputStream, it is always 0.
Why?
~Hill

available is not a good function to use because it's behavior is badly defined.
It is not implemented correctly in many input streams. This is because of the nature of the streams, they generally are not buffered very well in the lower systems. The InputStream api says that the available function SHOULD be overridden but is doesn't have to be.
Especially now with the new NIO classes, you don't need to use this functionality at all. This is one of the reasons that the NIO was created, as if this functionality actually worked correctly, one of the main reason for NIO ( the problem of one reader per thread ) would be eliminated.

InputStream.available() doen't work always

I have a remote HTTP resource of 11kb that I want to retrieve through InputStream obtained from HttpURLConnection (of J2SE) and HttpConnection (of J2ME).
If I download it byte after byte with this code ("is" is InputStream instance from Http) :
int ch;
ByteArrayOutputStream f = new ByteArrayOutputStream();
while ((ch = is.read()) != -1)
f.write((byte)ch);
it works fine on J2ME on my mobile phone (Nokia 6680), with WirelesseToolkit Emulator and also in my J2SE application.
But if I try to fetch the resource with read(array) it works only on my Nokia 6680 and not in WIrelessToolkit Emulator and J2SE application.
The code I used is this:
int byteDisp = is.available();
byte[] arraySwap = new byte[byteDisp];
is.read(arraySwap);
The problem is that is.available doesn't give me the actual value of bytes of my remote resource when I use the code on my desktop pc (with J2ME emulator or J2SE application). So I think that the problem is caused by Internet connection because it works fine on my mobile phone.
Can you help me?
I don't want to use the while with the byte read.
Thanks you,
ReX

>
Now it works fine everytime and everywhere, do you
think that this solution could give me some
problems?The loop means that the CPU is doing work it doesn't need to.
You can solve this by doing something like the following pseudo code demonstrates.
    byte buffer = new byte[1]; // Note the '1'
   socket.ReadBlock(buffer) // Read only one byte and block till we get it
   AccumlateMessage(buffer)
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For the above you can choose a value besides '1' if it seems reasonable for the actual protocol that you are using and with the possible error cases taken into account.

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InputStream available() question

Crosspost
Is it unusual for an input stream to say that there are X bytes available but when calling
int foo = in.read(myArray, intstart, myArray.length);to read less than the available?
foo = X - something?
Thanks

Thank you for the response. This is exactly what I'm
seeing though. I find it puzzling.
byte[] buffer = new byte[512];
int MAX = in.available(); // This is returning 972
bytes
if(MAX > buffer.length) MAX = buffer.length;
intTotal = in.read(buffer, 0, MAX); // intTotal =
155 ???Should I be looking elsewhere for the issue. The
stream is from a data socket.can u try this
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buffer = new byte[MIN];
intTotal = in.read(buffer, 0, MIN);

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Dear
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InputStream available() variance in functionality

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