尝试从Java运行应用程序时出现Java虚拟机错误

Question

I am trying to run an .exe from a java application, but I am getting this error message:

Java Virtual Machine Launcher(title) A Java Exception has occurred.

I have tried:

try {
            Runtime rt = Runtime.getRuntime();
            Process p = rt.exec("C:\\PathToExe\\MyExe.exe");
            InputStream in = p.getInputStream();
            OutputStream out = p.getOutputStream();
            InputStream err = p.getErrorStream();
} catch (Exception exc) {}

And:

try {
            Process process = new         ProcessBuilder("C:\\PathToExe\\MyExe.exe").start();
            InputStream is = process.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);
            String line;            
            while ((line = br.readLine()) != null) {
                System.out.println(line);
            }
        } catch (IOException ex) {
            Logger.getLogger(ScannerUI.class.getName()).log(Level.SEVERE, null, ex);
}

Both of them work when I try to run something else like uTorrent, but it fails when I try to run the .exe that I have to.

Also, this .exe is in a folder and if I try to run this .exe alone (out of it's folder) it returns the same error message.

I don't think the code above is wrong, but it's missing something to be able to run my .exe.

New CODE:

try
        {

            Runtime rt = Runtime.getRuntime();
            Process proc = rt.exec("C:\\PathToExe\\MyExe.exe");                
            InputStream stderr = proc.getErrorStream();
            InputStreamReader isr = new InputStreamReader(stderr);
            BufferedReader br = new BufferedReader(isr);
            String line = null;
            System.out.println("<ERROR>");
            while ( (line = br.readLine()) != null)
                System.out.println(line);
            System.out.println("</ERROR>");
            int exitVal = proc.waitFor();
            System.out.println("Process exitValue: " + exitVal);
        } catch (Exception e)
          {
            e.printStackTrace();
          }

New Output:

<ERROR>
Exception in thread "main" java.lang.NoClassDefFoundError: **org/lwjgl/LWJGLException**
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
        at java.lang.Class.getMethod0(Unknown Source)
        at java.lang.Class.getMethod(Unknown Source)
        at sun.launcher.LauncherHelper.getMainMethod(Unknown Source)
        at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.lwjgl.LWJGLException
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        ... 6 more
</ERROR>
Process exitValue: 0

Answer 1

Quoting you:

Also, this .exe is in a folder and if I try to run this .exe alone (out of it's folder) it returns the same error message.

Most likely you are forgetting to set appropriate directory. Use ProcessBuilder instead of Runtime.exec() , and make a call to ProcessBuilder.directory(File) method before ProcessBuilder.start() .

See this question for more information.