Replaced print statements with logger statements.

src/main/java/envoy/client/Client.java

@@ -1,5 +1,7 @@
 package envoy.client;
 
+import java.util.logging.Logger;
+
 import javax.ws.rs.client.ClientBuilder;
 import javax.ws.rs.client.Entity;
 import javax.ws.rs.client.WebTarget;
@@ -28,16 +30,18 @@ public class Client {
 	private Config			config;
 	private User			sender, recipient;
 
+	private static final Logger logger = Logger.getLogger(Client.class.getSimpleName());
+
 	public Client(Config config, String username) {
 		this.config	= config;
 		sender		= getUser(username);
-		System.out.println("ID: " + sender.getID());
+
+		logger.info("ID: " +  sender.getID());
 	}
 
 	private <T, R> R post(String uri, T body, Class<R> responseBodyClass) {
 		javax.ws.rs.client.Client	client	= ClientBuilder.newClient();
 		WebTarget					target	= client.target(uri);
-
 		Response	response		= target.request().post(Entity.entity(body, "application/xml"));
 		R			responseBody	= response.readEntity(responseBodyClass);
 		response.close();
@@ -92,7 +96,7 @@ public class Client {
 		if (returnSenderSync.getUsers().size() == 1) {
 			returnSender = returnSenderSync.getUsers().get(0);
 		} else {
-			System.out.println("ERROR exiting...");
+			logger.warning("ERROR exiting...");
 		}
 
 		return returnSender;

src/main/java/envoy/client/LocalDB.java

@@ -9,6 +9,7 @@ import java.io.ObjectOutputStream;
 import java.time.Instant;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.logging.Logger;
 
 import javax.xml.datatype.DatatypeConfigurationException;
 import javax.xml.datatype.DatatypeFactory;
@@ -36,6 +37,8 @@ public class LocalDB {
 	private ObjectFactory	objectFactory	= new ObjectFactory();
 	private DatatypeFactory	datatypeFactory;
 
+	private static final Logger logger = Logger.getLogger(LocalDB.class.getSimpleName());
+	
 	/**
 	 * Constructs an empty local database.
 	 *
@@ -80,13 +83,13 @@ public class LocalDB {
 			localDB.createNewFile();
 		} catch (IOException e) {
 			e.printStackTrace();
-			System.err.println("unable to save the messages");
+			logger.warning("unable to save the messages");
 		}
 		try (ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(localDB))) {
 			out.writeObject(chats);
 		} catch (IOException ex) {
 			ex.printStackTrace();
-			System.err.println("unable to save the messages");
+			logger.warning("unable to save the messages");
 		}
 	}
 
@@ -144,7 +147,7 @@ public class LocalDB {
 		}
 		readMessages.getMessages().clear();
 
-		System.out.println(sync.getMessages().size());
+		logger.info(String.format("Filled sync with %d messages.", sync.getMessages().size()));
 		return sync;
 	}
 
@@ -207,20 +210,20 @@ public class LocalDB {
 			if (returnSync.getMessages().get(i).getMetadata().getMessageId() != 0
 					&& returnSync.getMessages().get(i).getMetadata().getState() == MessageState.READ) {
 				// Update local Messages to state READ
-				System.out.println("Message with ID: " + returnSync.getMessages().get(i).getMetadata().getMessageId()
+				logger.info("Message with ID: " + returnSync.getMessages().get(i).getMetadata().getMessageId()
 						+ "was initialized to be set to READ in localDB.");
 				for (int j = 0; j < getChats().size(); j++) {
 					if (getChats().get(j)
 						.getRecipient()
 						.getID() == returnSync.getMessages().get(i).getMetadata().getRecipient()) {
-						System.out.println("Chat with: " + getChats().get(j).getRecipient().getID() + "was selected.");
+						logger.info("Chat with: " + getChats().get(j).getRecipient().getID() + "was selected.");
 						for (int k = 0; k < getChats().get(j).getModel().getSize(); k++) {
 							if (getChats().get(j).getModel().get(k).getMetadata().getMessageId() == returnSync
 								.getMessages()
 								.get(i)
 								.getMetadata()
 								.getMessageId()) {
-								System.out.println("Message with ID: "
+								logger.info("Message with ID: "
 										+ getChats().get(j).getModel().get(k).getMetadata().getMessageId()
 										+ "was selected.");
 								getChats().get(j)
@@ -228,7 +231,7 @@ public class LocalDB {
 									.get(k)
 									.getMetadata()
 									.setState(returnSync.getMessages().get(i).getMetadata().getState());
-								System.out.println("Message State is now: "
+								logger.info("Message State is now: "
 										+ getChats().get(j).getModel().get(k).getMetadata().getState().toString());
 							}
 						}
@@ -244,7 +247,7 @@ public class LocalDB {
 				if (getChats().get(k).getRecipient().getID() == returnSync.getUsers().get(j).getID()) {
 
 					getChats().get(k).getRecipient().setStatus(returnSync.getUsers().get(j).getStatus());
-					System.out.println(getChats().get(k).getRecipient().getStatus().toString());
+					logger.info(getChats().get(k).getRecipient().getStatus().toString());
 				}
 			}
 		}
@@ -342,7 +345,7 @@ public class LocalDB {
 			for (int j = 0; j < getChats().get(i).getModel().getSize(); j++) {
 				if (getChats().get(i).getModel().get(j).getMetadata().getState() == MessageState.WAITING) {
 					// addMessageToSync(localDB.getChats().get(i).getModel().get(j));
-					System.out.println("Got Waiting Message");
+					logger.info("Got Waiting Message");
 					sync.getMessages().add(0, getChats().get(i).getModel().get(j));
 				}
 			}

src/main/java/envoy/client/ui/ChatWindow.java

@@ -10,6 +10,7 @@ import java.awt.event.KeyAdapter;
 import java.awt.event.KeyEvent;
 import java.awt.event.WindowAdapter;
 import java.awt.event.WindowEvent;
+import java.util.logging.Logger;
 
 import javax.swing.DefaultListModel;
 import javax.swing.JButton;
@@ -56,6 +57,8 @@ public class ChatWindow extends JFrame {
 	private Chat		currentChat;
 
 	private JTextArea messageEnterTextArea;
+	
+	private static final Logger logger = Logger.getLogger(ChatWindow.class.getSimpleName());
 
 	public ChatWindow(Client client, LocalDB localDB) {
 		this.client		= client;
@@ -186,7 +189,7 @@ public class ChatWindow extends JFrame {
 				SettingsScreen.open(localDB.getUser().getName());
 			} catch (Exception e) {
 				SettingsScreen.open();
-				System.err.println("An error occured while opening the settings screen: " + e);
+				logger.warning("An error occured while opening the settings screen: " + e);
 				e.printStackTrace();
 			}
 		});

src/main/java/envoy/client/ui/Startup.java

@@ -3,6 +3,8 @@ package envoy.client.ui;
 import java.awt.EventQueue;
 import java.io.IOException;
 import java.util.Properties;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 import javax.swing.JOptionPane;
 
@@ -24,7 +26,11 @@ import envoy.exception.EnvoyException;
  */
 public class Startup {
 
+	private static final Logger logger = Logger.getLogger(Client.class.getSimpleName());
+	
 	public static void main(String[] args) {
+		logger.setLevel(Level.ALL);
+		
 		Config config = Config.getInstance();
 		if (args.length > 0) {
 			config.load(args);
@@ -40,13 +46,13 @@ public class Startup {
 		}
 
 		if (!config.isInitialized()) {
-			System.err.println("Server or port are not defined. Exiting...");
+			logger.warning("Server or port are not defined. Exiting...");
 			System.exit(1);
 		}
 
 		String userName = JOptionPane.showInputDialog("Please enter your username");
 		if (userName == null || userName.isEmpty()) {
-			System.err.println("User name is not set or empty. Exiting...");
+			logger.warning("User name is not set or empty. Exiting...");
 			System.exit(1);
 		}
 		Client	client	= new Client(config, userName);