从C＃程序启动时.jar将无法运行

Question

I'm using C# to develop some programs for Kinect. C# doesn't have anything as good as Java's Robot for simulating Keystrokes or Mouse movements, so I'm using Java for that. At the moment, I'm creating .jar files and trying to run them from the C# application (although I'm suspicious that there's a better way to do it). The way I do this is by putting this line in my C# code:

System.Diagnostics.Process.Start("CMD.exe", java -jar C:\\Users\\Me\\RobotProgram.jar");

This works fine in a small, basic C# application:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
           System.Diagnostics.Process.Start("CMD.exe", "/c java -jar C:\\Users\\Me\\RobotProgram.jar");
        }
    }
}

But when it's in a more complex program that uses the Kinect camera, it won't work. The console flashes up saying "Error occurred during initialization of VM java/lang/NoClassDefFoundError: java/lang/Object".

Answer 1

The Java project may be looking for required files in the working directory. Try setting the working directory before launching.

Directory.SetCurrentDirectory("C:\\Users\\Me");
System.Diagnostics.Process.Start("CMD.exe", "/c java -jar C:\\Users\\Me\\RobotProgram.jar");

Answer 2

You may need to specify the application's entry point.

Here's a simple explanation: https://samindaw.wordpress.com/2008/11/04/specifying-the-main-class-to-run-in-a-jar-file-from-command-line/

Answer 3

Do you have your JAVA_HOME environmental variable set up properly in the environment where the complex program is running?

The error points to an empty/wrong JAVA_HOME as even the base classes are not found