Help with running external programs within java

Hi,
I'm new here, and not sure whether i'm in the right place for this, but i thought i'd give it a shot anyway!
Basically i have a fortran program already written, that takes in the name of a text file as an input. I'm wanting to create a user interface to create this text file, and then i would have a button or something to enable me to then run the fortran program and input the file all from the user interface, and get rid of the need to manually run the fortran program.
Firstly, is this even possible?! Is it difficult to program and get to work?! Does anyone have any suggestions or guidance on this.
Thanks

@Op.
..and here are two links related to that.
http://java.sun.com/developer/JDCTechTips/2003/tt0304.html
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html

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Problems running external programs from java

Hello.
I wrote a pair of perl scripts and a GUI in java to run them. The first perl script just read the files in one directory makes some changes to the names of the files and then group all this files in a set of new directories. The other perl scripts takes all this new files and calls BLAST sequence alignment program and perform some alignments among these sequences. I tested this scripts and they work fine.
The problem comes when I try to run them for the JAVA GUI. I use RunTime and when I need to run the first perl script it all works well, but when The call to the second perl script is made the program fisishes without doing anything at all. I found out that the problem is that when running the script from the Java GUI it's not able to find BLAST program. So I guess that Java is not really starting a terminal session and it doesn't read my bash_profile to find out the path to my programs.
So, my question is if anyone knows a method to tell Java to load all this paths in the bash_proflie file so all of my scripts work???.
I have no idea is this can be done and how so any advice would be really wellcome.
By the way, my java version is 1.4.2 and my OS is Mac OS X 10.3
Thanks a lot , Julio

Invoke /bin/sh -c and give it your program's full path with.
(To understand what I've written, maybe reading
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps_p.html
http://mindprod.com/jgloss/exec.html
and
http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Runtime.html
(especially the exec(String[] cmdarray) method)
might help)
-T-

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hi
i am trying to run an external program using the runtime.exec() method. my problem is that the external program only runs when i press ctrl-c to exit my program. does anyone know how i can execute the external program while my program is still running without having to quit the program?should i be using threads?
thanks

As per the api doc exec will be executed as a seperate process
Process exec(String command) ------Executes the specified string command in a separate process.
Can you able to share that code what you have written ?

Run External Program in Java

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If someone can help me because I don't know the method.

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Search this forum
A few of many choices:
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2) Create exe with another language (C, C++, ...) to run your program
3) Java Web Start
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How to execute external program in java?

My question is how to execute an external program in java.
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Run external programs

Hi there..
I need a example to run others programs from Java, for example lunch the explorer.. Is possible do that?
Thanks you

Have a look at the Runtime class and especially the exec method. You should be able to do what you want using the following code:
Runtime.getRuntime().exec("explorer");

Running ssh from within java program

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Please Help with range of uncertainty in java program

I really need help with this, I've been searching for an answer all day and have found nothing.
This is the original program and I'm trying to make it so instead of stoppingDistance having to be equal to tailgateDistance for it to print minor wreck, it will allow a range of 40 feet. Like a range of uncertainty of plus or minus 20 feet, and I need to use a named constant that is: RANGE = 40.0
import java.util.Scanner;
public class StoppingA
public static void main(String[] args)
Scanner stdIn = new Scanner(System.in);
double speed; // speed car is traveling;
double tailgateDistance; // distance from other car;
double stoppingDistance; // calculated distance
System.out.print ("Enter your speed (in mph): ");
speed = stdIn.nextDouble();
System.out.print ("Enter your tailgate distance (in feet): ");
tailgateDistance = stdIn.nextDouble();
stoppingDistance=speed*(2.25+speed/21);
if (stoppingDistance < tailgateDistance)
System.out.println("No problem.");
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System.out.println("Minor wreck.");
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System.out.println("Major wreck!");
} // end main
} // end class StoppingA
Edited by: Ensanvoration on Feb 23, 2010 3:31 PM

Encephalopathic wrote:
Ensanvoration wrote:
Thanks, but I already tried that exact thing and it didn't work either. It's ridiculousIf you don't show us how you tried it, then we can only guess why it's not working.
... but if you wait around long enough, I bet you'll see JosAH post a recursive solution! :)Where is JosAH. Is he on vacation? Since I've been back, I haven't seen him.
Well, let's raise a bottle of Grolsch to him anyway. More for us.
¦ {Þ

Help! how to run other programs using java

how can i run other programs or exe files using java, anyone can give sample codes for this.
ex. if I click [run MsWord] button, then msWord automatically lunch

RunTime.getRuntime().exec(string command)
I guess, it might help you..java.lang.Runtime

Need help with jsp that uses a java program

Hi, sorry for my english but i am italian.
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If you are not allowed to use an applet, then you are limited by what can be achieved with HTML in a browser.
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For running multiple
threads at the same time, do you have to put two run()
methods
in the source? Hi there,
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new MyTask().start();
With an implementation of Runnable, you would do this:
new Thread(new MyTask()).start();
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In order to launch two threads simultaneously, you would have something along the lines of:
new MyTask().start();
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Run external programs using runtime class

Okay, I'm experiencing a really annoying problem with java.lang.runtime
I'm building a GUI that needs to run some external programs, via a button say. These generally produce a text file or something, so I don't need to stream the output or anything (at least I'm assuming I don't?). Should be very simple...
So at the terminal (bash) I would type ./programName , and everything will run hunkey dorey.
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String cmd = "./programName";
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(On windows incidentally, it's no problem at all and works absolutely fine. But when I go over to mac, which is what I need to use, I'm screwed - only adding to the annoyance!)
Any help would be much appreciated as I have a deadline looming!!

You need to read the 4 sections of [http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html|http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html] and implement the recommendations. Failure to implement all the recommendations will cause you grief.
P.S. The fragment of code you have posted shows that you have fallen for at least 4 of the traps.

Running External Program

Hi All
I really hope that some one can help ,e with my problem as i have no idea. OK i am calling an external program that outputs documents. This program uses control files and for each job there are 5 control files. Thus i call this program 5 times to get all my output documents. When i run this program from the command line then it works fine, however when i call it from my code i can see that it is working because my outputs are processed and i can see the program in the task manager. But it stops and does not continue to the next call, its like after this program does the processing then it just hangs. I dont know what is wrong and i cant get any errors in the logs either. I think that the problem either is with my java instalation as i had problems on the server and had to re-install java because someone installed multiple versions or that it is a jvm problem. Can some one please give some ideas of what could be the problem. My code looks as follow:
Process p = Runtime.getRuntime().exec("d://cep//nt_engine_010_62 prodengine -controlfile=d://cep//document1.txt");
p.waitFor();
System.out.println(p.exitValue());

You may want to give this code a try:
ProcessBuilder pb = new ProcessBuilder( whatever_command );
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      BufferedReader br= new BufferedReader( new InputStreamReader( is ) );
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        System.out.println( line );
      p.waitFor();

Need help with my addressbook program

hi,
i need help with my program here. this one should works as:
- saves user input into a txt file
- displays name of the saved person on the jlist whenever i run the program
- displays info about the person when clicked via textboxes given by reading the txt file where the user inputs are
- should scroll when the list exceeds the listbox
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.JList;
import java.awt.event.ActionListener;
import java.io.*;
import javax.swing.event.*;
import java.io.FilterInputStream;
public class AddressList extends JPanel implements ActionListener
     JTextField txt1 = new JTextField();
     JTextField txt2 = new JTextField();
     JTextField txt3 = new JTextField();
     DefaultListModel mdl = new DefaultListModel();
     JList list = new JList();
     JScrollPane listScroller = new JScrollPane(list);
     ListSelectionModel listSelectionModel;
     File fob = new File("Address3.txt");
     String name;
     char[] chars;
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          try
               RandomAccessFile rand = new RandomAccessFile(fob,"rw");
               BufferedReader br = new BufferedReader(new FileReader("Address3.txt"));
               if(fob.exists())
                     while((name = rand.readLine()) != null)
                          chars = name.toCharArray();
                          if(chars[0] == '*')
                               mdl.addElement(name);
                               list.setModel(mdl);
                          if(chars[0] == '#')
                               continue;
                else
                    System.out.println("No such file..");
          catch(IOException a)
                     System.out.println(a.getMessage());
     public AddressList()
          this.setLayout(null);
          listSelectionModel = list.getSelectionModel();
        listSelectionModel.addListSelectionListener(new ListInfo());
          list.setBounds(10,40,330,270);
          listScroller.setBounds(320,40,20,100);
          add(list);
          add(listScroller);
          JLabel lbl4 = new JLabel("Name: ");
          lbl4.setBounds(400,10,80,30);
          add(lbl4);
          JLabel lbl5 = new JLabel("Cellphone #: ");
          lbl5.setBounds(400,50,80,30);
          add(lbl5);
          JLabel lbl6 = new JLabel("Address: ");
          lbl6.setBounds(400,90,80,30);
          add(lbl6);
          JLabel lbl7 = new JLabel("List ");
          lbl7.setBounds(10,10,100,30);
          add(lbl7);
          txt1.setBounds(480,10,200,30);
          add(txt1);
          txt2.setBounds(480,50,200,30);
          add(txt2);
          txt3.setBounds(480,90,200,30);
          add(txt3);
          JButton btn1 = new JButton("Add");
          btn1.setBounds(480,130,100,30);
          btn1.addActionListener(this);
          btn1.setActionCommand("Add");
          add(btn1);
          JButton btn2 = new JButton("Save");
          btn2.setBounds(480,170,100,30);
          btn2.addActionListener(this);
          btn2.setActionCommand("Save");
          add(btn2);
          JButton btn3 = new JButton("Cancel");
          btn3.setBounds(480,210,100,30);
          btn3.addActionListener(this);
          btn3.setActionCommand("Cancel");
          add(btn3);
          JButton btn4 = new JButton("Close");
          btn4.setBounds(480,250,100,30);
          btn4.addActionListener(this);
          btn4.setActionCommand("Close");
          add(btn4);
     public static void main(String[]args)
          JFrame frm = new JFrame("Address List");
          AddressList panel = new AddressList();
          frm.getContentPane().add(panel,"Center");
          frm.setSize(700,350);
          frm.setVisible(true);
          panel.ListDisplay();
     public void actionPerformed(ActionEvent e)
          String cmd;
          cmd = e.getActionCommand();
          if(cmd.equals("Add"))
               txt1.setText("");
               txt2.setText("");
               txt3.setText("");
          else if(cmd.equals("Save"))
               mdl.addElement(txt1.getText());
               list.setModel(mdl);
               try
               RandomAccessFile rand = new RandomAccessFile(fob,"rw");
               BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
               LineNumberReader line = new LineNumberReader(br);
                if(fob.exists())
                          rand.seek(fob.length());
                          rand.writeBytes("* " + txt1.getText());
                          rand.writeBytes("\r\n" + "# " + txt2.getText());
                          rand.writeBytes("\r\n" + "# " + txt3.getText() + "\r\n");
                else
                     System.out.println("No such file..");
                    txt1.setText("");
                    txt2.setText("");
                    txt3.setText("");
                catch(IOException a)
                     System.out.println(a.getMessage());
          else if(cmd.equals("Cancel"))
               txt1.setText("");
               txt2.setText("");
               txt3.setText("");
          else if(cmd.equals("Close"))
               System.exit(0);
class ListInfo implements ListSelectionListener
     public void valueChanged(ListSelectionEvent e)
          ListSelectionModel lsm = (ListSelectionModel)e.getSource();
          int minIndex = lsm.getMinSelectionIndex();
        int maxIndex = lsm.getMaxSelectionIndex();
          try //*this one should display the info of the person whenever i click the person's name at the list box via textbox.. but i cant seem to get it right since it always display the info of the first person inputed.. i tried to get the program to display them whenever it reads lines with * on them....
               File fob = new File("Address3.txt");
               RandomAccessFile rand = new RandomAccessFile(fob,"rw");
               BufferedReader br = new BufferedReader(new FileReader("Address3.txt"));
               LineNumberReader line = new LineNumberReader(br);
               if(fob.exists())
                          for(int i = minIndex; i<=maxIndex; i++)
                               if(lsm.isSelectedIndex(i))
                                    while((name = rand.readLine()) != null)
                                         chars = name.toCharArray();
                                         if(chars[0] == '#')
                                              continue;
                                         if(chars[0] == '*')
                                              txt1.setText(rand.readLine());
                                             txt2.setText(rand.readLine());
                                             txt3.setText(rand.readLine());
                else
                          System.out.println("No such file..");
          catch(IOException a)
                     System.out.println(a.getMessage());
}the only problem now is about how it should display the right info about the person whenever i click its name on the list.. something about file reading or something, i just cant figure it out.
and also about how to make it scroll once it exceeds the list.. i cant make it work, maybe something about wrong declaration..
thanks in advance..
Edited by: syder on Mar 14, 2008 2:26 AM

Like said before, do one thing at a time. At startup, something like:
//put all the content in a list
ArrayList<String> lines = new ArrayList<String>();
while(String line=rand.readLine()!=null) {
    lines.add(line);
}If you follow the good advice to create a class to encapsulate the entries, you could populate a list of such entries like this:
static final int ENTRY_SIZE = 3;//you have 3 fields now, better to have a constant if that changes
ArrayList<Entry> entries = new ArrayList<Entry>();
for(int i=0; i<lines.size(); i+=ENTRY_SIZE) {
    Entry entry = new Entry(lines.get(i), lines.get(i+1), lines.get(i+2);
    entries.add(newEntry);
}You could also do both of the above in one run, but I think you will understand better what's happening if you do one thing at a time.
If you don't want to put the entries in an encapsulating class, you can still access this without looping:
int listStartIdx = <desired_entry_index>*ENTRY_SIZE;
String att1 = lines.get(listStartIdx).substring(1);
String att2 = lines.get(listStartIdx+1).substring(1);
String att3 = lines.get(listStartIdx+2).substring(1);

Help with running external programs within java

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