Running Java from ASP.NET MVC doesn't work

Question

When I try to run Java code from cmd, it works. But when I run it from ASP.NET MVC application, I always get: Cannot find or load main. This is the code I'm using:

Process p = new Process();
            p.StartInfo.FileName = "C:/Program Files/Java/jdk1.8.0_20/bin/java.exe";
            p.StartInfo.UseShellExecute = false;
            p.StartInfo.Arguments = "E:/Atypon/TE1/src/Assignment3.DateTest";
            p.StartInfo.RedirectStandardInput = true;
            p.StartInfo.CreateNoWindow = true;
            p.StartInfo.RedirectStandardOutput = true;
            p.StartInfo.CreateNoWindow = true;
            p.StartInfo.RedirectStandardError = true;
            p.Start();
            string result = p.StandardError.ReadToEnd();
            p.WaitForExit();

What am I doing wrong?

Probably you did not provide it with complete file name. Usually java runnables' files end with either `.class` or `.jar`. — M. Prokhorov, Apr 11 '17 at 15:50
Adding the extension is one of the causes of this error when running java from cmd. But I tried it and it didn't work. — Comp23555, Apr 11 '17 at 15:57
Before running it in C#, what happens if you just execute it at the command line? `"C:/Program Files/Java/jdk1.8.0_20/bin/java.exe" E:/Atypon/TE1/src/Assignment3.DateTest` Get that working first before trying to do it from C#. — mason, Apr 11 '17 at 16:25
I'm getting the same error. Even though if I use `java E:/Atypon/TE1/src/Assignment3.DateTest `, it works.( if I use it from the Java program directory). — Comp23555, Apr 11 '17 at 16:36

score 1 · Answer 1 · edited May 23 '17 at 12:25

1

Could the paramters be wrong for the class name, perhaps it should be

p.StartInfo.Arguments = "E:/Atypon/TE1/src/Assignment3.DateTest.class";

What does "Could not find or load main class" mean?

edited May 23 '17 at 12:25

Community

1
1

answered Apr 11 '17 at 15:49

toby

40
5

I tried and it didn't work. Actually, I once read that adding .class generates this error. – Comp23555 Apr 11 '17 at 15:56

Comp23555 · Accepted Answer · 2017-04-13T20:41:31.730

Looks like I have to specify the path to main class in the working directory , not Arguments:

 public ActionResult Run()
    {
        Process p = new Process();
        p.StartInfo.FileName = "C:/Program Files/Java/jdk1.8.0_20/bin/java.exe";
        p.StartInfo.UseShellExecute = false;
        //path to dir
        p.StartInfo.WorkingDirectory = "E:/Atypon/TE1/src";
        //packageName.MainClass
        p.StartInfo.Arguments = "Assignment3.DateTest";
        p.StartInfo.RedirectStandardInput = true;
        p.StartInfo.CreateNoWindow = true;
        p.StartInfo.RedirectStandardOutput = true;
        p.StartInfo.CreateNoWindow = true;
        p.StartInfo.RedirectStandardError = true;
        p.Start();
        string result = p.StandardOutput.ReadToEnd();
        p.WaitForExit();
        return View("Index",(Object)result);
    }

Running Java from ASP.NET MVC doesn't work

2 Answers2