If plugin is already joined to the channel, joining is skipping.

src/in/pinig/ttvmc/Main.java

@@ -1,6 +1,7 @@
 package in.pinig.ttvmc;
 
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.HashMap;
 import org.bukkit.configuration.file.FileConfiguration;
 import org.bukkit.plugin.java.JavaPlugin;
@@ -10,6 +11,7 @@ public class Main extends JavaPlugin {
 	public static FileConfiguration config;
 	public static HashMap<String, Boolean> state;
 	public static HashMap<String, String> channels;
+	public static ArrayList<String> joinedChannels;
 	@Override
 	public void onEnable() {
 		// config
@@ -18,6 +20,7 @@ public void onEnable() {
 
 		state = new HashMap<String, Boolean>();
 		channels = new HashMap<String, String>();
+		joinedChannels = new ArrayList<String>();
 
 		Utils.loadChannelsFromConfig();
 

src/in/pinig/ttvmc/TMI.java

@@ -20,8 +20,10 @@ public void run() {
 				out.println("NICK justinfan35815\n");
 				for(Map.Entry<String, String> e: Main.channels.entrySet()) {
 					String channel = e.getValue();
+					if(Main.joinedChannels.contains(channel)) continue;
 					System.out.println("Joining to #" + channel + " just for " + e.getKey());
 					out.println("JOIN #" + channel + "\n");
+					Main.joinedChannels.add(channel);
 				}
 
 				for (;;) {