Sending multiple photos from server to client stuck in a while loop

I'm building a server/client application that consists of sending and saving information about photos.

I've managed to successfully send 1 photo from the client to the server at a time. Now, I'm trying to get the server to send the client multiple photos.

I used the same code I used before and put it in a for loop. However, when I run the code, the client side gets stuck on the while loop. What's especially weird is that, if I ask the server to send 3 photos, the client successfully receives the 3 and completes the first 2 loops, both the while and the for, correctly (I observed this with some prints on the console). However, it does not leave the while loop on the last iteration. I also noticed that, if I close the server, the client is able to finish the loop.

I would like to know why the client is getting stuck on the last iteration of the while loop, even though it seems like it's correctly receiving the entirety of the images (I can open them).

The code I used on the server side is the following:

for (int i=0; i<n;i++) {      try {          //photo          File f = new File("photo.jpg");                    BufferedInputStream reader = new BufferedInputStream( new FileInputStream( f ) );                                //sending the photo          byte[] buffer = new byte[ 4096 ];          int bytesRead;          while ( (bytesRead = reader.read(buffer)) != -1 ) {              //ObjectOutputStream outStream is being passed to the function as an argument              outStream.write( buffer, 0, bytesRead );              }          reader.close();      } catch (IOException e) {          e.printStackTrace();      }  }  

It's somewhat simplified, because in reality I'm iterating through a list of photos and updating f on each cycle.

The code on the client side looks like this:

for (int j=0; j<n; j++) {      try {          File result = new File("fromServer.jpg");          BufferedOutputStream out2 = new BufferedOutputStream( new FileOutputStream( result ) );                            byte[] buffer = new byte[ 4096 ];          int bytesRead;          //ObjectInputStream in was created earlier in the code, inside the same function          while ( (bytesRead = in.read( buffer )) != -1 ) {              out2.write( buffer, 0, bytesRead );          }          out2.flush();          out2.close();          } catch (IOException e3) {              e3.printStackTrace();          }  }  

Once again, I simplified the code because the file name and location is also updated on each iteration but this is the core of the idea.

I would like to know why the client doesn't leave the while loop on the last image. Thank you in advance.

https://stackoverflow.com/questions/66485248/sending-multiple-photos-from-server-to-client-stuck-in-a-while-loop March 05, 2021 at 08:59AM