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how to get windows domain user in jsp

Does anybody know how to get domain user name who opened my jsp page ?

Maybe there is some api (SAP or other )?

I can run my project in portal maybe there is some portal api?

I tried this code in servlet but in my case it always prompt login pop up.

I want to read username without user interaction.

Maybe somebody can check this code in her/his enviroment.

			String auth = request.getHeader("Authorization");
			if (auth == null)
			  response.setHeader("WWW-Authenticate", "NTLM");
			if (auth.startsWith("NTLM "))
			  byte[] msg = new sun.misc.BASE64Decoder().decodeBuffer(auth.substring(5));
			  int off = 0, length, offset;
			  if (msg[8] == 1)
				byte z = 0;
				byte[] msg1 = {(byte)'N', (byte)'T', (byte)'L', (byte)'M', (byte)'S', (byte)'S', (byte)'P', 
				  z,(byte)2, z, z, z, z, z, z, z,(byte)40, z, z, z, 
				  (byte)1, (byte)130, z, z,z, (byte)2, (byte)2,
				  (byte)2, z, z, z, z, z, z, z, z, z, z, z, z};
				response.setHeader("WWW-Authenticate", "NTLM " + 
				   new sun.misc.BASE64Encoder().encodeBuffer(msg1));
			  else if (msg[8] == 3)
				off = 30;

				length = msg[off+17]*256 + msg[off+16];
				offset = msg[off+19]*256 + msg[off+18];
				String remoteHost = new String(msg, offset, length);

				length = msg[off+1]*256 + msg[off];
				offset = msg[off+3]*256 + msg[off+2];
				String domain = new String(msg, offset, length);

				length = msg[off+9]*256 + msg[off+8];
				offset = msg[off+11]*256 + msg[off+10];
				String username = new String(msg, offset, length);
				PrintWriter out = response.getWriter();

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