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();
           


        

Answer 1

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);