How run .sh script with user input from textfield in Java?

Question

I try start.sh script with user input from txtfield. Idea: user write parametre in txt fild. When push the button and script start with this parametre.

My code:

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) 
{                                         
String valueURL;
valueURL = URLtxt.getText().toString();              
ProcessBuilder processBuilder = new ProcessBuilder();
// -- Linux --
// Run a shell command
processBuilder.command("bash", "-c","nikto -h", valueURL,");     

try {

Process process = processBuilder.start();
StringBuilder output = new StringBuilder();
BufferedReader reader = new BufferedReader(
new InputStreamReader(process.getInputStream()));
String line;
while ((line = reader.readLine()) != null) {
output.append(line + "\n");         
}
int exitVal = process.waitFor();
if (exitVal == 0)                                            
 {
    this.hide();
    ScanWS sws = new ScanWS() ;
    sws.setVisible(true);

Answer 1

1. An event istener is triggered in UI thread, so the processing must be fast . Your listener implementation waits for an external process , it can freeze your ui. All the process triggering and caring logic must start in a separate Thread.

2. A process is quite an old construction and it has input/output issue. A process writes something during it's work into a buffer of it's output stream and when the buffer is all filled - the process hungs , waiting for the output stream to make some space. So, both process.input and process.output processors also must work in separate threads.