Launching applications from within a Java program,

Hi all,
I wish to launch an application from a menubutton. I exactly wish to launch adobe acrobat reader and a specific file. Do I need to run a system command to do this, or more specifically, how is this done in Java?
Thanks,
JavaRob

what if you have the entire exe as a byte array in
memory, write that to a file on the system, and then
run that file.
would that work?Yes but you would still have to use the Runtime class to excecute the file after you write it out, so it would just be easier to use the already made exe file.

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Start a WS application from within a java program

Hi,
I need to start a WebStart application from within a java program. Therefore I develeoped a class which starts javaws.exe within its main-method like this:
try {
Runtime.getRuntime().exec(
"c:\\java web start\\javaws.exe http://a.b/c.jnlp"
} catch (Exception e) {
e.printStackTrace();
And that did not work. Java Web Start tries to start the .jnlp program but returns with the message, that the app-desc|applet-desc|installer-desc|component-desc is missing. But it is there: It is an applet and thus I defined an applet-dec.
I tried to do it from a command line with the followinf command:
java -Djnlpx.home="C:\abc" -cp "C:\abc\javaws.jar" com.sun.javaws.Main http://a.b/c.jnlp
And that works. But using this command from within my jjava prog using the Runtime.exec() method does not work.
By the way, simply type "javaws http://a.b/c.jnlp" at the command line does not work.
Can anybody help me? How may I start a .jnlp program within another java program.
Kind Regards,
Tobias Neubert

Hi,
I recently had a quite similar problem. At least the error message by the Java Web Start application on Mac OS X complained about the same error (app-desc|applet-desc|installer-desc|component-desc). It turned out to be some bad invisible characters in the jnlp file. I copied some sample from a web page which for some reason contained some unicode chars that the parser doesn't like. Use a different text editor or the less command on unix to see if there are some strange characters in you jnlp file.
But it seems strange that it does work from the command line and not from your code.
-Stefan

Executing a Java Program from within a Java Program

I need to execute the following Java Program from withing another Java Program. The office toolbar command line is
D:\WINDOWS\system32\java.exe -cp E:\Development\Eclipse\UpdateServer\Classes -server -showversion UpdateServer
I can find no combination of ProcessBuilder commands, including those that include "Cmd.exe /c" that will make this program run from within another Java Program. All the examples I can find only show how to run Windows *.exe programs. I keep getting error 123 from ProcessBuilder.start(), but I can find no documentation for error 123.

Assuming your code didn't get mangled by the forum
(it's missing one "), it may be that your "-cp
E:\\Develop.." argument is getting quoted as it has a
space in it; try passing "-cp" and "E:\\Develop..."
as two arguments.That worked; specifically the following tested OK:
ProcessBuilder pb = new ProcessBuilder("D:\\WINDOWS\\System32\\Java.exe", "-cp", "E:\\Development\\Eclipse\\UpdateServer\\Classes\\", "-server", "-showversion", "UpdateServer" );
pb.directory(new File("E:\\Development\\Eclipse\\UpdateServer\\Classes\\"));
try{
     Process p = pb.start();
     InputStream is = p.getErrorStream();
     InputStreamReader isr = new InputStreamReader(is);
     BufferedReader br = new BufferedReader(isr);
     String line;
     while ((line = br.readLine()) != null)
          System.out.println(line);
     p.waitFor();
}catch(IOException ioe){
I was sure I tried that exact same code before, and it did not work, but now it does, at least at the top level (when it is in main of a test program). I will have to wait to try it until later when it is buried deep in a subroutine.

How to call up an executable file (eg. MSPaint) from within my java program

How to call up an executable file (eg. MSPaint) from within my java program

Ummm... why would you want to get MSPaint anyway? Even in the absense of real software, Java's own graphics tools are way more sophisticated - with a little time and effort, you could write a simple paint package that beat MSPaint hands down.

Running executable jar from within a java program

Is there a way to launch an executable jar in a java program? I tried wrapping the jar in an exe and calling it using Runtime exec() and though this approach works it does only for windows. I want it to work for unix/linux too.

jaki wrote:
Yes, but it's a sub process.Nope.
Hence the calling process doesn't quit unless the called one returns.Wrong.
My calling program is actually a jar and what Im trying to do is delete the jar after it's done running. But the above method (of launching a separate jar doing the deletion) doesn't seem to work for the above mentioned reason.Wrong.
If you could tell me any other way it would really be a big help.You don't need any other way. Maybe you need to allow some time for the calling program to wind up. 20 seconds may be overkill, but I'm not in the mood to find how short it can be and still succeed.
The two classes are packaged in separate jars.import java.io.IOException;
public class Deletee {
    public static void main(String[] args) {
      try {
         String[] cmds = {"java", "-jar", "E:/temp/Deleter.jar"};
         Runtime.getRuntime().exec(cmds);
         System.exit(0);
      } catch (IOException ex) {
         ex.printStackTrace();
import java.io.File;
import javax.swing.JOptionPane;
public class Deleter {
   public static void main(String[] args) {
      File file = new File("E:/temp/Deletee.jar");
      try {
         Thread.sleep(20000);
      } catch (InterruptedException ex) {
         ex.printStackTrace();
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         JOptionPane.showMessageDialog(null, "Deleted");
      } else {
         JOptionPane.showMessageDialog(null, "Oops");
}Try it and see for yourself.
db

Displaying a shell from within a Java program

Hi,
For some long and twisted reason, I need to execute native programs from a Java program. Since this program is only every intended to be run on Linux, this doesn't bother me breaking the x-platform rules for Java! So, Runtime.exec() is the normal way to do this.
However, Runtime.exec() runs executes the command and then dishes basck the output once it's finished. The external program I wish to run takes a while and actually prints various pieces of feedback during its processing. I'd like to display this feedback to the user as it happens, rather than dumping it all at the end.
I can't think of anyway to do this. I've been looking for "Java shells" but they are reimplemented shells with only let you run classes on the classpath. Any ideas from the gurus around here?
Cheers

import java.util.*;
import java.io.*;
class StreamGobbler extends Thread
InputStream is;
String type;
StreamGobbler(InputStream is, String type)
this.is = is;
this.type = type;
public void run()
try
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line=null;
while ( (line = br.readLine()) != null)
System.out.println(type + "> " + line);
} catch (IOException ioe)
ioe.printStackTrace();
public class GoodLinuxExec
public static void main(String args[])
if (args.length < 1)
System.out.println("USAGE: java GoodLinuxExec <cmd>");
System.exit(1);
try
Runtime rt = Runtime.getRuntime();
System.out.println("Execing " + args[0]);
Process proc = rt.exec(args);
// any error message?
StreamGobbler errorGobbler = new
StreamGobbler(proc.getErrorStream(), "ERROR");
// any output?
StreamGobbler outputGobbler = new
StreamGobbler(proc.getInputStream(), "OUTPUT");
// kick them off
errorGobbler.start();
outputGobbler.start();
// any error???
int exitVal = proc.waitFor();
System.out.println("ExitValue: " + exitVal);
} catch (Throwable t)
t.printStackTrace();
stolen from this article and adapted to suit an os which does not start with the letter W.

How to start a browser from within a java program?

I want to make a help file for my java program and want to run the browser from the menu of my program.
How can I start my browser from my program?
A small code will be helpful.
Thanks.
Niteen

This should work on Windows without having to know where the browser is located. See http://www.javaworld.com/javaworld/javatips/jw-javatip66.html for more details
public static void viewHtml(URL url, boolean fixHtmlExtension){
      String cmd = "rundll32 url.dll,FileProtocolHandler " + url.toExternalForm();
      if (fixHtmlExtension){
        //There is a bug in rundll32. For http requests, it doesn't like .html or .htm extensions,
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        //This fix is not needed for file requests.
        if (cmd.endsWith(".htm")){
          cmd = cmd.substring(0,cmd.length()-1) + "%6D";
        else if (cmd.endsWith(".html")){
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      catch(InterruptedException e){

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anu.

you could write a little polling class checking the zip file. you can use the java.util.jar package to extract the zip file (http://java.sun.com/docs/books/tutorial/jar/api/index.html). you could also use Jakarta ant (http://ant.apache.org/manual/index.html) to do this job (core task "zip") and call ant's target file on a regular basis (dependend on the OS you use, you can set os tasks/schedules).

How to execute a Perl program from within a Java prog

How do I execute a Perl program from within a Java program.
Lets say the Perl program that I want to execute is 'abc'. Now, 'abc' requires some input that I want to give it from within the Java program. How do I do it?
And finally, how do I execute that Perl program from within the Java program.
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where inp1, inp2, inp3 are inputs to the Perl program. I will not be able to change or modify the coding of the Perl program - 'abc' as I do not have access to its code. Its a kind of an application whose usual method of execution is in the above shown way. So, how do I execute 'abc' from within a Java program.

what part of don't crosspost, don't you understand?
http://forum.java.sun.com/thread.jsp?forum=4&thread=427193

Executing a Perl program from within a Java prog

How do I execute a Perl program from within a Java program.
Lets say that the Perl program that I want to execute is 'abc'.'abc' requires some input that I want to give from within the java program. How do I do that? Then I want to execute the Perl program from within the Java prog. How do I do it?

don't crosspost.
http://forum.java.sun.com/thread.jsp?forum=31&thread=427211&tstart=0&trange=100

Problem with creation of a jar file from inside a java program

Hi,
I am trying to create a jar file at runtime from within a java program.
I am able to create a jar file just fine using:
String[] jarArgs = new String[3];
jarArgs[0] = "cvf";
jarArgs[1] = "C:\temp\myjar.jar";
jarArgs[2] = "C:\temp\this";
sun.tools.jar.Main main1 = new sun.tools.jar.Main(System.out, System.err, "jar");
main1.run(jarArgs);However, when I look at the jar it puts the absolute path to the files inside such as:
C:\temp\this\is\my\package\Class.class
instead of only this\is\my\package\Class.class
When running the jar command from the command line it works just fine and I have the relative paths in my jar file.
Does anyone have any experience with this and could help me out?
Thanks in advance
Edited by: mruf on Apr 11, 2008 1:51 AM

Shouldn't jarArgs[2] = "-C C:\temp\this"

How to run java programs from a master java program?

Hello,
I have several java programs which run from the command prompt. I am seeking help with code for starting java programs from within a java program. For example, a program called master.java works something like this:
import java.*;
create connection pool
create variables and result sets
start/run slave1.java (var1, var2);
start/run slave2.java (var3, var4, var5);
start/run slave3.java (var1, var4);
end of program master.java
Each of the slave.java programs will run for up to an hour. I do not want the master.java program to pause for each slave program to stop. Instead, the master program will keep running and multiple slave programs will be running simultaneously with the master program. When a slave program starts, it is on its own. Also, if possible, I would like to have each of these slave.java programs open in a new separate command window, so I can observe each slave program running in separate windows.
Any suggestions for code or helpful documentation are greatly appreciated.
Thank you,
Logan

Thank you all.
At the bottom of master.java I have successfully started a batch file with these lines:
String jcmd = "cmd.exe /c start c:/data/simulations/MsgViewCount2.bat";
Process proc = Runtime.getRuntime().exec(jcmd);
But I still cannot get a java program to start. Here is one variation I have tried:
String [] cmdArray = new String[2];
cmdArray[0] = "java";
cmdArray[1] = "slave1";
Runtime runtime = Runtime.getRuntime();
Process process = runtime.exec(cmdArray);
This compiles, and no errors occur, but nothing happens.
Regarding this comment:
Why Runtime.exec? Either make the slaves Runnable or
just call their main() methods.
Oh, I see. Sepearate output. :PNone of the slave.java programs have any output.
Thanks again.

Executing C program from with a java program

How do you call a c program from within a java program, and parse arguments into that program and return something.
Cheers for any reply...

Read http://www.javaworld.com/jw-12-2000/jw-1229-traps.html

Calling a java application from within another class

I have written a working java application that accepts command line parameters through public static void main(String[] args) {} method.
I'm using webMethods and I need to call myapplication from within a java class created in webMethods.
I know I have to extend my application class within the webMethods class but I do not understand how to pass the parameters.
What would the syntax look like?
Thanks in advance!

why do you want to call the second class by its main method ??
Why not have another static method with a meaningfull name and well defined parameters ?
main is used by the jvm as an entry point in your app. it is not really meant for two java applications to communicate with each other but main and the code is not really readable.
Have a look at his sample
double myBalance = Account.getBalance(myAccountId);
here Account is a class with a static method getBalance which return the balance of the account id you passed.
and now see this one, here Account has a main method which is implemented to call getBalance.
String[] args = new String[1];
args[0] = myAccountId;
Account.main(args);
the problem with the code above is
main doesn't return anything so calling it does do much good. two the code is highly unreadable because no one know what does the main do... unlike the sample before this one where the function name getBalance clearly told what is the function doing without any additional comments.
hope this helps.... let me know if you need any additional help.
regards,
Abhishek.

Launching applications from java code

I have found a solution to launch applications from java.I thought this will be useful for programmers who want to open a
1. Browser
2. Player
3. Files etc.
There are 2 solutions :
I)To use a known application :
eg: to open windows media player
String[] cmd = new String[3];
cmd[0] = "cmd.exe";
cmd[1] = "/C";
cmd[2] = "START MPLAYER2.exe "+mediaURL+" /PLAY /CLOSE /FULLSCREEN";
//eg: mediaURL = "\"D:/project/songs/track1.mp3\""
// /PLAY /CLOSE /FULLSCREEN this option can be used only for windows media player
// for any other application use cmd[2] as START apl.exe //apl can be any windows application
Process p = Runtime.getRuntime().exec(cmd);
II) To use a default application:
Runtime.getRuntime().exec("rundll32 url.dll,FileProtocolHandler " + url);
// url can be any url
ref: [http://forums.sun.com/thread.jspa?threadID=5203313|http://forums.sun.com/thread.jspa?threadID=5203313]
[http://www.ericphelps.com/batch/rundll/|http://www.ericphelps.com/batch/rundll/]
Edited by: veda_sishta on ? ?????, ???? ??:?? ???????
Edited by: veda_sishta on ? ?????, ???? ??:?? ???????

To post code, use the code tags -- [code]Your Code[/code] will display asYour CodeOr use the code button above the editing area and paste your code between the {code}{code} tags it generates.
And make up your mind what file type you're having a problem with. Maybe .asx doesn't have a file association on your computer.
This works just fine for .m3u:import java.awt.Desktop;
import java.io.File;
import java.io.IOException;
public class Playlist {
   public static void main(String[] args) {
      try {
         Desktop.getDesktop().
               open(new File("E:/Music/Playlists/test.m3u"));
      } catch (IOException ex) {
         ex.printStackTrace();
}db
edit Did you try searching the net for the error you got? ("Invalid menu handle")
Edited by: Darryl.Burke

Launching applications from within a Java program,

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