Throw a SCPRemoteException when an error occurs on the remote server. SCPRemoteException contains the error message returned from the remote server.

src/main/java/net/schmizz/sshj/xfer/scp/SCPDownloadClient.java

@@ -123,7 +123,7 @@ public final class SCPDownloadClient extends AbstractSCPClient {
 
             case (char) 1:
             case (char) 2:
-                throw new SCPException("Remote SCP command returned error: " + msg.substring(1));
+                throw new SCPRemoteException("Remote SCP command returned error: " + msg.substring(1), msg.substring(1));
 
             default:
                 final String err = "Unrecognized message: `" + msg + "`";
@@ -202,4 +202,4 @@ public final class SCPDownloadClient extends AbstractSCPClient {
         return parts;
     }
 
-}
+}

src/main/java/net/schmizz/sshj/xfer/scp/SCPEngine.java

@@ -69,7 +69,8 @@ class SCPEngine {
                 return;
             case 1: // Warning? not
             case 2:
-                throw new SCPException("Remote SCP command had error: " + readMessage());
+                final String remoteMessage = readMessage();
+                throw new SCPRemoteException("Remote SCP command had error: " + remoteMessage, remoteMessage);
             default:
                 throw new SCPException("Received unknown response code");
         }

src/main/java/net/schmizz/sshj/xfer/scp/SCPRemoteException.java

@@ -0,0 +1,15 @@
+package net.schmizz.sshj.xfer.scp;
+
+public class SCPRemoteException extends SCPException
+{
+    private final String remoteMessage;
+
+    public SCPRemoteException(String message, String remoteMessage) {
+        super(message);
+        this.remoteMessage = remoteMessage;
+    }
+
+    public String getRemoteMessage() {
+        return remoteMessage;
+    }
+}