MJava : Using Minecraft JRE

You can download JRE in Mojang server using MJava.

        var java = new CmlLib.Utils.MJava(Minecraft.DefaultPath + "\\runtime");
        if (!java.CheckJavaw())
        {
            java.DownloadProgressChanged += (s, v) =>
            {
                Console.WriteLine(v.ProgressPercentage);
            };
            java.UnzipCompleted += (t, w) =>
            {
                Console.WriteLine("completed");
            };

            java.DownloadJava();
        }

        string javapath = Minecraft.DefaultPath + "\\runtime\\bin\\javaw.exe";