How do I run GDB and accept GDB commands through Java output console?

I am trying to build a GUI for GCC which has some basic functionalities like compile, link, execute, debug, etc for C++ programs using Java. I am creating strings of command which I pass to the ProcessBuilder and run it via command prompt and GCC.

command = "cd src & cd Resources & g++"+ compileFile.cpp +" -Wall "+" -o "+"tempOut";

This is a sample code for compiling the file.

Part of this is the debug functionality for which I am using GDB. Now the problem is GDB needs additional input to add breakpoints, remove breakpoints and so on. I am having trouble on how to pass these necessary inputs to GDB via Java terminal. If I pass the commands in the command prompt, it is working fine and I get the desired output.enter image description here

But whenever I fire the GDB command from the Java program, I cannot pass any inputs from the IDE's terminal. I am aware that each GDB command uses a different process and I tried attaching Java's process ID to GDB but I just get a blank output console. It seems that the GDB session has started but there is no way to interact with that process through the IDE's output console.

int pid = Integer.parseInt(ManagementFactory.getRuntimeMXBean().getName().split("@")[0]);command = "gdb attach "+ pid;fireCommand();

EDIT

This is the method that interacts with command prompt to take input and display output in the IDE's output console:

public void fireCommand() {        String line;        String os = System.getProperty("os.name");        ProcessBuilder builder;        if(os.startsWith("Win")) {            builder = new ProcessBuilder("cmd.exe", "/c", command);        }        else{            builder = new ProcessBuilder("bash", "-c", command);        }        try {            process = builder.start();            BufferedReader reader = new BufferedReader(                    new InputStreamReader(process.getInputStream()));            while ((line = reader.readLine()) != null) {                if(line.contains("Input the value")) {                    //any other user input in non debug execution                    String value = JOptionPane.showInputDialog(line);                    BufferedWriter writer = new BufferedWriter(                            new OutputStreamWriter(process.getOutputStream()));                    writer.write(value, 0, value.length());                    writer.newLine();                    writer.close();                }                else {                    output.append(line).append("\n");                }            }            int exitVal = process.waitFor();            if (exitVal == 0) {                //display("Success!");                display(output.toString());            } else {                String lineErr;                BufferedReader readerErr = new BufferedReader(                        new InputStreamReader(process.getErrorStream()));                while ((lineErr = readerErr.readLine()) != null) {                    outputErr.append(lineErr).append("\n");                }                //display(exitVal);                display(outputErr.toString()); //Display the uncatched errors            }        } catch (IOException e) {            display("There was a problem with the I/O");            e.printStackTrace();        } catch (InterruptedException e) {            display("There was a interruption with the execution");            e.printStackTrace();        }        if(!outputErr.toString().isEmpty())        errorFormatDisplay();                                                   //display Error output function    }

Any leads on this would be very helpful. Thank you.