Error In Executing A File in JAVA

[Somnath Mallick]

Hi Everyone,

I have this piece of code, but I am getting an error while executing it. Could you please tell me where i am going wrong here. I know it which line the error is occurring but i don't know what to put in there.

Code:

package com.citrix.blade.download;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.ObjectInputStream.GetField;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class DownloadCitrix {

	/**
	 * Download a file from a FTP server. A FTP URL is generated with the
	 * following syntax:
	 * ftp://user:password@host:port/filePath;type=i.
	 * 
	 * @param ftpServer , FTP server address (optional port ':portNumber').
	 * @param user , Optional user name to login.
	 * @param password , Optional password for user.
	 * @param fileName , Name of file to download (with optional preceeding
	 *            relative path, e.g. one/two/three.txt).
	 * @param destination , Destination file to save.
	 * @throws MalformedURLException, IOException on error.
	 */
	public void download(File savedFile) throws MalformedURLException, IOException
	{
		
		if (savedFile != null)
		{
			BufferedInputStream bufferedInputStream = null;
			BufferedOutputStream bufferOutputStream = null;
			try
			{
				URL url = new URL("**************************/WSAD-RDP.ica");
				URLConnection urlConnection = url.openConnection();

				bufferedInputStream = new BufferedInputStream(urlConnection.getInputStream());
				bufferOutputStream = new BufferedOutputStream(new FileOutputStream(savedFile));

				int i;
				while ((i = bufferedInputStream.read()) != -1)
				{
					bufferOutputStream.write( i );
				}
			}
			finally
			{
				if (bufferedInputStream != null)
					try
				{
						bufferedInputStream.close();
				}
				catch (IOException ioe)
				{
					ioe.printStackTrace();
				}
				if (bufferOutputStream != null)
					try
				{
						bufferOutputStream.close();
				}
				catch (IOException ioe)
				{
					ioe.printStackTrace();
				}
			}
		}
		else
		{
			System.out.println( "Input not available" );
		}
	}

	
	public static void main(String[] args) 
	{
		DownloadCitrix downloadCitrix = new DownloadCitrix();
		File savedFile = new File("C:\\WSAD-RDP.ica");		
		
		try
		{
			if (!savedFile.exists())
			{
				savedFile.createNewFile();
			}
			else
			{
				savedFile.delete();
				savedFile.createNewFile();
				
			}
			downloadCitrix.download(savedFile);
			
			System.out.println("File Downlaoded!!");
			
			Runtime runtime = Runtime.getRuntime();
			runtime.exec("C:\\WSAD-RDP.ica");
			System.out.println("File Executed!!");
		}
		catch (Exception e) {
			System.out.println("Error \n");
			e.printStackTrace();
		}		
	}
}

And the error is:

java.io.IOException: CreateProcess: C:\WSAD-RDP.ica error=193
	at java.lang.ProcessImpl.create(Native Method)
	at java.lang.ProcessImpl.<init>(Unknown Source)
	at java.lang.ProcessImpl.start(Unknown Source)
	at java.lang.ProcessBuilder.start(Unknown Source)
	at java.lang.Runtime.exec(Unknown Source)
	at java.lang.Runtime.exec(Unknown Source)
	at java.lang.Runtime.exec(Unknown Source)
	at com.citrix.blade.download.DownloadCitrix.main(DownloadCitrix.java:109)

Sorry i could not provide the URL.

[Jelle Klap]

Looks like the Citrix ICA client is returning an error code when executing the WSAD-RDP.ica file,
The code 193 appears to indicate a CreateFileMapping error, whatever that may be.
More of a Citrix / ICA related problem it seems. You're certain the configuration in the ICA file is valid?

[Somnath Mallick]

Yes. I think so. When i double click on the file, it opens perfectly. But when i do it through the code, it throws this error.

[Jelle Klap]

Oh, my bad (I think).
The error code is not related to the ICA file at all.
I just noticed you're calling Runtime's exec() method and providing the .ica file as an argument.
That won't work, because it's not an executable file in and of itself.
You'll have to provide a path to an executable that can take a path to an .ica file as a (command-line) argument and execute accordingly.
When double-clicking the file in Windows, the file association for the .ica extension will take care of that for you.

[Somnath Mallick]

So could you please tell me how the runtime.exec() should be like?

[Jelle Klap]

No, because i don't know the name of or the path to the executable that's supposed to handle the .ica file.
XenApp presumably?

[Somnath Mallick]

I just mean an example of what it should be like... I dont need the whole thing!

[Jelle Klap]

Well ok, an example of executing a .bat file using CMD.exe:

package nl.jekl.javaranch;

public class RuntimeDemo
{
  public static void main(String[] args) throws Exception
  {
    Runtime runtime = Runtime.getRuntime();   
    runtime.exec("C:/windows/system32/cmd.exe /C C:/temp/helloworld.bat");   
  }
}

Note that I'm purposefully using the full path to the cmd.exe file here, even though in this case that's not strictly necessary.

[Somnath Mallick]

Thanks. Will check it out and let you know.

[Rob Spoor]

An alternative is using one of the following:

1) don't use Runtime.exec but Desktop.open:

Desktop.open(savedFile);

2) use rundll32 to launch the default application:

String[] cmd = {
    "rundll32",
    "url.dll,FileProtocolHandler",
    savedFile.getAbsolutePath()
};
Runtime runtime = Runtime.getRuntime();
runtime.exec(cmd);
System.out.println("File Executed!!");

Note that I used an array to specify the command; I just prefer it that way.

Also, whenever you use Runtime.exec or ProcessBuilder be sure to have read When Runtime.exec() won't.

[Somnath Mallick]

Thanks Jelle/Rob for helping me out with this. It works now.

@Rob: I would like to know that what is the argument "url.dll,FileProtocolHandler" mean??

Actually this is part of larger application that I am trying to make. Just would like to ask the question here rather than starting a new thread.

So after the Citrix ICA client opens up. I have to enter a username and password into the Citrix login. Can I do it through Java?

Actually I am trying to make an auto login to a Citrix ICA client.

[Rob Spoor]

Somnath Mallick wrote:@Rob: I would like to know that what is the argument "url.dll,FileProtocolHandler" mean??

Don't ask me how it works, but if the first argument to the rundll32 application (part of Windows) is that exact string, rundll32 will lookup the default application for whatever comes after it. You can use it to launch your default browser for URLs as well, by simply passing a URL (starting with http:// or https://).

[Somnath Mallick]

Thanks Rob...

Could you please help out in the other queries as well.

[Rob Spoor]

I already would have if I had known the answer.