Execute .jar file from a Java program

Question

How could I run a local jar file from a java program?

The jar file is not in the class-path of the Java caller program.

Answer 1

I suggest you use a ProcessBuilder and start a new JVM.

Here is something to get you started:

ProcessBuilder pb = new ProcessBuilder("/path/to/java", "-jar", "your.jar"); pb.directory(new File("preferred/working/directory")); Process p = pb.start(); 

Answer 2

    Process proc = Runtime.getRuntime().exec("java -jar Validate.jar");     proc.waitFor();     // Then retreive the process output     InputStream in = proc.getInputStream();     InputStream err = proc.getErrorStream();      byte b[]=new byte[in.available()];     in.read(b,0,b.length);     System.out.println(new String(b));      byte c[]=new byte[err.available()];     err.read(c,0,c.length);     System.out.println(new String(c));