java.lang.IllegalStateException: Request Data has already been read CQ5,AEM

Question

I have a code in java that sends byte[] to CQ servlet using POST. The code for sending is :

        URL url = new URL("http://localhost:4503/bin/services/updateslafile");   
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();                    
        String authStr = "admin:admin";
        // encode data on your side using BASE64
        byte[] bytesEncoded = Base64.encodeBase64(authStr.getBytes());
        String authEncoded = new String(bytesEncoded);                                                                          
        connection.setRequestProperty("Authorization", "Basic "+authEncoded);
        connection.setDoOutput(true);      
        connection.setRequestMethod("POST");   
        connection.setRequestProperty("fileName", "test.docx");
            byte[] input;//assume input initialized with some .docx file content as byte[]
        OutputStream outs = connection.getOutputStream();
        outs.write(input);
        outs.flush();   
        outs.close();

        //for response reading
        StringBuffer strBuffer = new StringBuffer();
        InputStream inputStream = connection.getInputStream();
        byte[] b = new byte[1024];
        while ( is.read(b) != -1)
            strBuffer.append(new String(b));
        System.out.println("strbuffer : "+strBuffer.toString());

The code in the servlet(extends SlingAllMethodsServlet) for reading the byte[] is like below :

            String fileName = request.getHeader("fileName");
            // opens input stream of the request for reading data

           InputStream inputStream = request.getInputStream();// This line giving error
            String filePath = "/home/usr/documents/"+fileName;
            // opens an output stream for writing file
            FileOutputStream fileOuputStream = new FileOutputStream(filePath); 

            byte[] buffer = new byte[BUFFER_SIZE];
            int bytesRead = -1;
            LOGGER.info("Receiving data...");
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                     fileOuputStream.write(buffer, 0, bytesRead);
            }
            LOGGER.info("Data received.");
            fileOuputStream.close();
            inputStream.close();

Now when I run the code in the error log I am getting some error

08.03.2016 15:19:37.162 ERROR [127.0.0.1 [1457430567960] POST /bin/services/updateslafile HTTP/1.1] org.apache.sling.engine.impl.SlingRequestProcessorImpl service: Uncaught Throwable java.lang.IllegalStateException: Request Data has already been read

Apart from this error I am also getting below error but I think this isn't relevant.

08.03.2016 15:17:31.092 ERROR [qtp87442412-7274] org.apache.sling.engine.impl.parameters.ParameterSupport getRequestParameterMapInternal: Error parsing request java.lang.IllegalArgumentException: Bad escape sequence: %ۑ

I know request.getInputStream() is giving some issue but not sure how to fix it

Answer 1

ok I got it working by handling it in another way. Now I am sending the byte[] as a string to servlet in parameter as below :

connection.setDoOutput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("fileName", filename);
OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
writer.write("inputstream=" + Arrays.toString(input));
writer.close();

And then in the servlet reading the parameter as below :

String encodingScheme = "UTF-8";
request.setCharacterEncoding(encodingScheme);
String requestStr = request.getParameter("inputstream");
byte[] rawRequestMsg = requestStr.getBytes();

Like this I am getting the byte[] in servlet but the issue here is that when I write this byte[] sequence to a file, instead of writing content only bytes are written so I see only numbers inside the file. Code for writing in the file which I used is below :

FileOutputStream fileOuputStream = new FileOutputStream(uploadedFileLocation);
fileOuputStream.write(byteArray); // byteArray is byte[]		
fileOuputStream.close();