Run a jar File from java program

Question

I am trying to execute jar files from another Java program. I am using the following code :

      try {
          Runtime runtime = Runtime.getRuntime();
          runtime.exec("path upto jar");
      } catch (Exception ex) {
          JOptionPane.showMessageDialog(null, "Exception occured" + ex);
      }

But its not working. I tried google and it gave me the examples using ProcessBuilder, but that is not working either.

Does your argument to `exec` include the necessary `[path]/java -jar` bits? — chrylis -cautiouslyoptimistic-, Aug 01 '13 at 04:01
And use `ProcessBuilder`, it handles space in commands/parameters better — MadProgrammer, Aug 01 '13 at 04:02

Aniket Thakur · Accepted Answer · 2013-08-01T04:21:04.780

Using ProcessBuilder(java.lang.ProcessBuilder) will solve your problem. Syntax is as follows -

ProcessBuilder pb = new ProcessBuilder("java", "-jar", "absolute path upto jar");
Process p = pb.start();

You can redirent input/output/error to/from files as follows

File commands = new File("absolute path to inputs file");
File dirOut = new File("absolute path to outputs file");
File dirErr = new File("absolute path to error file");

dirProcess.redirectInput(commands);
dirProcess.redirectOutput(dirOut);
dirProcess.redirectError(dirErr);

score 9 · Answer 2 · answered Aug 01 '13 at 04:04

9

First suggestion/recommendation is to use ProcessBuilder instead of Runtime. Here is what you can try:

ProcessBuilder pb = new ProcessBuilder("java", "-jar", "./jarpath/yourjar.jar");
Process p = pb.start();
BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
String s = "";
while((s = in.readLine()) != null){
    System.out.println(s);
}
int status = p.waitFor();
System.out.println("Exited with status: " + status);

answered Aug 01 '13 at 04:04

Juned Ahsan

67,789
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If the while loop terminates with the process, is the waitFor() really required? – Sam Ginrich Oct 15 '21 at 17:09

score 2 · Answer 3 · answered Feb 12 '15 at 05:34

2

You can run a jar file from where ever you want by using only this one line code.

    Desktop.getDesktop().open(new File("D:/FormsDesktop.jar"));

where

new File("your path to jar")

Hope it helps.

Thanks.

answered Feb 12 '15 at 05:34

Syeda Zunaira

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38
70

Run a jar File from java program

3 Answers3

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