如何从Java应用程序执行可运行的jar

Question

I have a runnable Jar which I want to invoke from my another java application. I have tried this solution

[link] how to run a java executable jar in another java program

I am able to execute the jar but seems that threads are in deadlock and it never generates the output. Can anyone please help me over this?

Answer 1

You can use ProcessBuilder from plain Java or use library like zt-exec from ZeroTurnaround. Second tools allows you to easily add for example execution timeout, set exit values, etc

In first case it'll looks like:

Process p = new ProcessBuilder("java", "-jar myjar.jar").start();
p.start();

In second:

new ProcessExecutor().command("java -jar myjar.jar").execute();

Answer 2

Another way, if you know the class which have main method, your program invoke the main method form jar.

Example.java

public void test() {
    String[] starr = <- if you have some parameter
    ProgramInJar.main(starr);
}

mytest.jar

public class ProgramInJar {
    public static void main(String[] args) {
        // your operation
    }
}

Answer 3

I have found the solution. I have updated my JDK and then invoke the jar and it worked. Thank you all for the help and time.