Propagate POP3 I/O errors

app/src/main/java/com/sun/mail/pop3/POP3Store.java

@@ -288,7 +288,10 @@ public class POP3Store extends Store {
 	} catch (EOFException ex) {
 	    throw cleanupAndThrow(p, ex);
 	} catch (Exception ex) {
-	    throw cleanupAndThrow(p, new EOFException(ex.getMessage()));
+		if (ex.getCause() instanceof IOException)
+			throw cleanupAndThrow(p, (IOException) ex.getCause());
+		else
+			throw cleanupAndThrow(p, new EOFException(ex.getMessage()));
 	}
 
 
@@ -428,10 +431,14 @@ public class POP3Store extends Store {
 
 	    // only the first supported and enabled mechanism is used
 	    logger.log(Level.FINE, "Using mechanism {0}", m);
-	    String msg =
+	    try {
-		p.authenticate(m, host, authzid, user, passwd);
+			String msg =
-	    if (msg != null)
+					p.authenticate(m, host, authzid, user, passwd);
-		throw new AuthenticationFailedException(msg);
+			if (msg != null)
+				throw new AuthenticationFailedException(msg);
+		} catch (IOException ex) {
+			throw new AuthenticationFailedException(m, ex);
+		}
 	    return true;
 	}
 

app/src/main/java/com/sun/mail/pop3/Protocol.java

@@ -296,7 +296,7 @@ class Protocol {
      */
     synchronized String authenticate(String mech,
 				String host, String authzid,
-				String user, String passwd) {
+				String user, String passwd) throws IOException {
 	Authenticator a = authenticators.get(mech.toUpperCase(Locale.ENGLISH));
 	if (a == null)
 	    return "No such authentication mechanism: " + mech;
@@ -305,7 +305,7 @@ class Protocol {
 		return "login failed";
 	    return null;
 	} catch (IOException ex) {
-	    return ex.getMessage();
+	    throw ex;
 	}
     }