Java Runtime.getRuntime().exec

Question

I am trying to merge 2 simple programs I have made to one .jar. I packed both .jars into a new one and used Runtime.getRuntime().exec method to execute them.

Code:

public class main {
  public static void main(String[] args) {
    try {
      Runtime.getRuntime().exec("cmd /c proj1.jar");
    } catch(Exception exce){ 
      /*handle exception*/
      try {
        Runtime.getRuntime().exec("cmd /c proj2.jar");
      } catch(Exception exc){
        /*handle exception*/

      }
    }
  }
}

The problem is that only proj1.jar is executed and proj2.jar doesn't run. I am new to java and don't know why this happens. How do I fix this? I want both files to be executed.

Answer 1

Your problem is that your second file is ONLY executed if the first throws an exeception. You're looking for this:

public class main {
  public static void main(String[] args) {
    try {
      Runtime.getRuntime().exec("cmd /c proj1.jar");
      Runtime.getRuntime().exec("cmd /c proj2.jar");
    } catch(Exception exce){ 
      /*handle exception*/
    }
  }
}

Or, if you absolutely must handle the exceptions separately, this:

public class main {
  public static void main(String[] args) {
    try {
      Runtime.getRuntime().exec("cmd /c proj1.jar");
    } catch(Exception exce){ 
      /*handle exception*/
    }

    try {
      Runtime.getRuntime().exec("cmd /c proj2.jar");
    } catch (Exception e) {
      //handle the exception
    }
  }
}