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diff --git a/libjava/classpath/gnu/java/rmi/server/UnicastRef.java b/libjava/classpath/gnu/java/rmi/server/UnicastRef.java
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+++ b/libjava/classpath/gnu/java/rmi/server/UnicastRef.java
@@ -0,0 +1,278 @@
+/* UnicastRef.java --
+   Copyright (c) 1996, 1997, 1998, 1999, 2002, 2005
+   Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+ 
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.java.rmi.server;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.io.ObjectInput;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutput;
+import java.io.ObjectOutputStream;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.rmi.Remote;
+import java.rmi.RemoteException;
+import java.rmi.server.ObjID;
+import java.rmi.server.Operation;
+import java.rmi.server.RMIClientSocketFactory;
+import java.rmi.server.RemoteCall;
+import java.rmi.server.RemoteObject;
+import java.rmi.server.RemoteRef;
+import java.rmi.server.UID;
+
+public class UnicastRef
+	implements RemoteRef, ProtocolConstants {
+
+public ObjID objid;
+UnicastConnectionManager manager;
+
+/**
+ * Used by serialization, and let subclass capable of having default constructor
+ */
+// must be public otherwise java.rmi.RemoteObject cannot instantiate this class
+// -- iP
+public UnicastRef() {
+}
+
+public UnicastRef(ObjID objid, String host, int port, RMIClientSocketFactory csf) {
+	this(objid);
+	manager = UnicastConnectionManager.getInstance(host, port, csf);
+}
+
+public UnicastRef(ObjID objid) {
+	this.objid = objid;
+}
+
+public Object invoke(Remote obj, Method method, Object[] params, long opnum) throws Exception {
+    // Check if client and server are in the same VM, then local call can be used to
+    // replace remote call, but it's somewhat violating remote semantic.
+    Object svrobj = manager.serverobj;
+    
+    // Make sure that the server object is compatible. It could be loaded from a different
+    // classloader --iP
+    if(svrobj != null && method.getDeclaringClass().isInstance(svrobj)){
+        //local call
+		Object ret = null;
+		try{
+		    ret = method.invoke(svrobj, params);
+		}catch(InvocationTargetException e){
+		    throw (Exception)e.getTargetException();
+		}
+		//System.out.println("\n\n ***** local call: " + method + "\nreturn: " + ret + "\n\n");
+		return ret;
+	}
+	//System.out.println("***************** remote call:" + manager.serverPort);
+	return (invokeCommon(obj, method, params, -1, opnum));
+}
+
+private Object invokeCommon(Remote obj, Method method, Object[] params, int opnum, long hash) throws Exception {
+	UnicastConnection conn;
+	try {
+		conn = manager.getConnection();
+	}
+	catch (IOException e1) {
+		throw new RemoteException("connection failed to host: " + manager.serverName, e1);
+	}
+
+	ObjectOutputStream out;
+	DataOutputStream dout;
+	try {
+		dout = conn.getDataOutputStream();
+		dout.writeByte(MESSAGE_CALL);
+
+		out = conn.startObjectOutputStream(); // (re)start ObjectOutputStream
+		
+		objid.write(out);
+		out.writeInt(opnum);
+		out.writeLong(hash);
+		
+		// must handle primitive class and their wrapper classes
+		Class clss[] = method.getParameterTypes();
+	    for(int i = 0; i < clss.length; i++)
+	        ((RMIObjectOutputStream)out).writeValue(params[i], clss[i]);
+
+		out.flush();
+	}
+	catch (IOException e2) {
+		throw new RemoteException("call failed: ", e2);
+	}
+
+	int returncode;
+	Object returnval;
+	DataInputStream din;
+	ObjectInputStream in;
+	UID ack;
+	try {
+		din = conn.getDataInputStream();
+		
+		if ((returncode = din.readUnsignedByte()) != MESSAGE_CALL_ACK) {
+		    conn.disconnect();
+			throw new RemoteException("Call not acked:" + returncode);
+		}
+
+		in = conn.startObjectInputStream(); // (re)start ObjectInputStream
+		returncode = in.readUnsignedByte();
+		ack = UID.read(in);
+
+		Class cls = method.getReturnType();
+
+	if (returncode == RETURN_NACK) { 
+	    returnval = in.readObject();  // get Exception
+
+        } else if(cls == Void.TYPE) { 
+            returnval = null;
+            // in.readObject() // not required! returntype 'void' means no field is returned.
+        } else {
+            returnval = ((RMIObjectInputStream)in).readValue(cls); // get returnvalue
+	}
+	} catch (IOException e3) {
+	    //for debug: e3.printStackTrace();
+		throw new RemoteException("call return failed: ", e3);
+	}
+
+    /* if DGCAck is necessary??
+    //According to RMI wire protocol, send a DGCAck 
+    // to indicate receiving return value
+    dout.writeByte(MESSAGE_DGCACK);
+    ack.write(dout);
+    out.flush();
+    */
+    
+	manager.discardConnection(conn);
+
+	if (returncode != RETURN_ACK && returnval != null) {
+		if (returncode == RETURN_NACK) throw (Exception)returnval;
+		else throw new RemoteException("unexpected returncode: " + returncode);
+	}
+
+	return (returnval);
+}
+
+/**
+ * @deprecated
+ */
+public RemoteCall newCall(RemoteObject obj, Operation[] op, int opnum, long hash) throws RemoteException {
+    UnicastConnection conn;
+    
+	try {
+		conn = manager.getConnection();
+	}
+	catch (IOException e1) {
+		throw new RemoteException("connection failed to host: " + manager.serverName, e1);
+	}
+
+    //obj: useless?
+
+	return (new UnicastRemoteCall(conn, objid, opnum, hash));
+}
+
+/**
+ * @deprecated
+ */
+public void invoke(RemoteCall call) throws Exception {
+	UnicastRemoteCall c = (UnicastRemoteCall)call;
+	call.executeCall();
+}
+
+/**
+ * @deprecated
+ */
+public void done(RemoteCall call) throws RemoteException {
+	UnicastRemoteCall c = (UnicastRemoteCall)call;
+	try{
+	    c.done();
+	} catch(IOException e){}
+    UnicastConnection conn = c.getConnection();
+	manager.discardConnection(conn);
+}
+
+public void writeExternal(ObjectOutput out) throws IOException {
+	if (manager == null) {
+		throw new IOException("no connection");
+	}
+	manager.write(out);
+	objid.write(out);
+	// This byte is somewhat confusing when interoperating with JDK
+	out.writeByte(0); //RETURN_ACK);
+}
+
+public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
+	manager = UnicastConnectionManager.read(in);
+	objid = ObjID.read(in);
+	byte ack = in.readByte();
+	// This byte is somewhat confusing when interoperating with JDK
+	if (ack != RETURN_ACK && ack != 0/*jdk ack value*/) {
+		throw new IOException("no ack found");
+	}
+}
+
+public boolean remoteEquals(RemoteRef ref) {
+	throw new Error("Not implemented");
+}
+
+public int remoteHashCode() {
+	throw new Error("Not implemented");
+}
+
+public String getRefClass(ObjectOutput out) {
+	return ("UnicastRef");
+}
+
+public String remoteToString() {
+	throw new Error("Not implemented");
+}
+
+public void dump(UnicastConnection conn) {
+	try {
+		DataInputStream din = conn.getDataInputStream();
+		for (;;) {
+			int b = din.readUnsignedByte();
+			System.out.print(Integer.toHexString(b));
+			if (b >= 32 && b < 128) {
+				System.out.print(": " + (char)b);
+			}
+			System.out.println();
+		}
+	}
+	catch (IOException _) {
+	}
+}
+
+}