Make UnknownHostException more low-key. They are to be expected.

Whenever the update procedure is ongoing, and the server temporarily 
lost connectivity to the internet (or more likely, dev.bukkit.org is 
down), a huge exception log will be printed in the console. See ticket
134 for a real life example.

This is completely out of propotion to the problem at hand (connection
problems), so we will replace the error log with a simple warning 
message.

ProtocolLib/src/main/java/com/comphenix/protocol/CommandProtocol.java

@@ -19,6 +19,7 @@ package com.comphenix.protocol;
 
 import java.io.File;
 import java.io.IOException;
+import java.net.UnknownHostException;
 
 import org.bukkit.ChatColor;
 import org.bukkit.command.CommandSender;
@@ -45,7 +46,7 @@ class CommandProtocol extends CommandBase {
 	 */
 	public static final String NAME = "protocol";
 	
-	public static final ReportType REPORT_HTTP_ERROR = new ReportType("Http error: %s");
+	public static final ReportType REPORT_NETWORK_ERROR = new ReportType("Network error: %s");
 	public static final ReportType REPORT_CANNOT_CHECK_FOR_UPDATES = new ReportType("Cannot check updates for ProtocolLib.");
 	public static final ReportType REPORT_CANNOT_UPDATE_PLUGIN = new ReportType("Cannot update ProtocolLib.");
 	
@@ -87,9 +88,9 @@ class CommandProtocol extends CommandBase {
 					UpdateResult result = updater.update(UpdateType.NO_DOWNLOAD, true);
 					sender.sendMessage(ChatColor.BLUE + "[ProtocolLib] " + result.toString());
 				} catch (Exception e) {
-					if (isHttpError(e)) {
+					if (isNetworkError(e)) {
 						getReporter().reportWarning(CommandProtocol.this, 
-								Report.newBuilder(REPORT_HTTP_ERROR).messageParam(e.getCause().getMessage())
+								Report.newBuilder(REPORT_NETWORK_ERROR).messageParam(e.getCause().getMessage())
 						);
 					} else {
 						getReporter().reportDetailed(CommandProtocol.this, Report.newBuilder(REPORT_CANNOT_CHECK_FOR_UPDATES).error(e).callerParam(sender));
@@ -110,9 +111,9 @@ class CommandProtocol extends CommandBase {
 					UpdateResult result = updater.update(UpdateType.DEFAULT, true);
 					sender.sendMessage(ChatColor.BLUE + "[ProtocolLib] " + result.toString());
 				} catch (Exception e) {
-					if (isHttpError(e)) {
+					if (isNetworkError(e)) {
 						getReporter().reportWarning(CommandProtocol.this, 
-								Report.newBuilder(REPORT_HTTP_ERROR).messageParam(e.getCause().getMessage())
+								Report.newBuilder(REPORT_NETWORK_ERROR).messageParam(e.getCause().getMessage())
 						);
 					} else {
 						getReporter().reportDetailed(CommandProtocol.this, Report.newBuilder(REPORT_CANNOT_UPDATE_PLUGIN).error(e).callerParam(sender));
@@ -173,10 +174,13 @@ class CommandProtocol extends CommandBase {
 		}
 	}
 	
-	private boolean isHttpError(Exception e) { 
+	private boolean isNetworkError(Exception e) { 
 		Throwable cause = e.getCause();
 		
-		if (cause instanceof IOException) {
+		if (cause instanceof UnknownHostException) {
+			// These are always network problems
+			return true;
+		} if (cause instanceof IOException) {
 			// Thanks for making the message a part of the API ...
 			return cause.getMessage().contains("HTTP response");
 		} else {