specific exception for connection problems

src/main/java/org/scribe/exceptions/OAuthConnectionException.java

@@ -0,0 +1,14 @@
+package org.scribe.exceptions;
+
+/**
+ * @author: Pablo Fernandez
+ */
+public class OAuthConnectionException extends OAuthException
+{
+  private static final String MSG = "There was a problem while creating a connection to the remote service.";
+
+  public OAuthConnectionException(Exception e)
+  {
+    super(MSG, e);
+  }
+}

src/main/java/org/scribe/exceptions/OAuthSignatureException.java

@@ -8,6 +8,7 @@ package org.scribe.exceptions;
 public class OAuthSignatureException extends OAuthException
 {
   private static final long serialVersionUID = 1L;
+  private static final String MSG = "Error while signing string: %s";
   
   /**
    * Default constructor
@@ -17,7 +18,7 @@ public class OAuthSignatureException extends OAuthException
    */
   public OAuthSignatureException(String stringToSign, Exception e)
   {
-    super("Error while signing string: " + stringToSign, e);
+    super(String.format(MSG, stringToSign), e);
   }
 
 }

src/main/java/org/scribe/model/Request.java

@@ -61,13 +61,9 @@ class Request
       createConnection();
       return doSend();
     }
-    catch (UnknownHostException uhe)
+    catch (Exception e)
     {
-      throw new OAuthException("Could not reach the desired host. Check your network connection.", uhe);
-    }
-    catch (IOException ioe)
-    {
-      throw new OAuthException("Problems while creating connection.", ioe);
+      throw new OAuthConnectionException(e);
     }
   }