weird GzipInputstream problem

Question

Hi all,

I have a server that basically caters to multiple clients. I am basically using gzip(input/output)stream to compress the data between client-server.

Many clients can send the requests to server at the same time and hence i have a thread to cater to each client.

Now, the problem tat i am experiencing is that "randomly" some client code fails whenever it tries to execute following after the connection to the server has been established.

`GZIPInputStream in = new GZIPInputStream(server.getInputStream());`

I get java.io.EOFException.

And when i say randomly, i mean there is no pattern that i can find in the exception. The requests are being send properly (else it would not work for any client requests).

I have searched a lot..but couldnt find anything.. :(

Any pointers on the above problem ??

Thanks,

Answer 1

What is the error rate? Could it be that these are random (occasional) network errors? Or perhaps your server is occasionally experiencing an internal error?

It doesn't really sound like the problem is with the GZip data itself, but rather with an occasional network break. My guess is that your server occasionally generates an exception and sends an invalid stream, causing this type of error on the client. Perhaps try logging all exceptions on the server to insure that you aren't occasionally getting internal failure there?

Answer 2

Hi heres the code snippet from my application... Client code that connects to the server, makes a request and waits for a response... There could be many simultaneous such requests meant for the server....

Socket connection= new Socket("localhost",2428);
GZIPOutputStream out = new GZIPOutputStream(connection.getOutputStream());
out.write(url.getBytes());
out.finish();
GZIPInputStream in=null;

 try
     {
     in = new GZIPInputStream(connection.getInputStream(),1024); // Exception raised here
     }
     catch(Exception e){
       }

Server code that accepts a new connection and spawns a new thread.

ServerSocket dsWeb= new ServerSocket(2428);
Socket webClient;
while(true){
webClient = dsWeb.accept();

executor.execute(new ThreadPool()); // each request to be handled by a separate thread 

}

The code within the thread ..

GZIPInputStream inWeb = new GZIPInputStream(webClient.getInputStream());
int c1=0;
byte[] b1 = new byte[100000];
c1=inWeb.read(b1);
//Process the request
GZIPOutputStream outWeb = new GZIPOutputStream(webClient.getOutputStream());
outWeb.write(/* Response */);
outWeb.finish();

Do you find anything amiss in the code ???

Thanks,