Revised code according to reviews by @delvh and @CyB3RC0nN0R

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

@@ -54,15 +54,15 @@ public class ChatWindow extends JFrame {
 	private LocalDB	localDB;
 	// GUI components
 	private JPanel			contentPane	= new JPanel();
-	private PrimaryTextArea	messageEnterTextArea;
+	private PrimaryTextArea	messageEnterTextArea = new PrimaryTextArea(space);
 	private JList<User>		userList	= new JList<>();
 	private Chat			currentChat;
 	private JList<Message>	messageList	= new JList<>();
 	private JScrollPane		scrollPane	= new JScrollPane();
 	private JTextPane		textPane	= new JTextPane();
 	// private JCheckBox jCbChangeMode;
-	private PrimaryButton	postButton;
+	private PrimaryButton	postButton = new PrimaryButton("Post");
-	private PrimaryButton	settingsButton;
+	private PrimaryButton	settingsButton	= new PrimaryButton("Settings");
 
 	private static int space = 4;
 
@@ -76,7 +76,8 @@ public class ChatWindow extends JFrame {
 		setBounds(100, 100, 600, 800);
 		setTitle("Envoy");
 		setLocationRelativeTo(null);
-		setIconImage(Toolkit.getDefaultToolkit().createImage(getClass().getClassLoader().getResource("envoy_logo.png")));
+		setIconImage(
+				Toolkit.getDefaultToolkit().createImage(getClass().getClassLoader().getResource("envoy_logo.png")));
 
 		// Save chats when window closes
 		addWindowListener(new WindowAdapter() {
@@ -124,9 +125,6 @@ public class ChatWindow extends JFrame {
 		gbc_scrollPane.insets = new Insets(space, space, space, space);
 		contentPane.add(scrollPane, gbc_scrollPane);
 
-		// Checks for changed Message
-		messageEnterTextArea = new PrimaryTextArea(space);
-
 		// Message enter field
 		messageEnterTextArea.addKeyListener(new KeyAdapter() {
 
@@ -140,7 +138,6 @@ public class ChatWindow extends JFrame {
 			}
 		});
 
-
 		GridBagConstraints gbc_messageEnterTextfield = new GridBagConstraints();
 		gbc_messageEnterTextfield.fill	= GridBagConstraints.BOTH;
 		gbc_messageEnterTextfield.gridx	= 1;
@@ -151,7 +148,6 @@ public class ChatWindow extends JFrame {
 		contentPane.add(messageEnterTextArea, gbc_messageEnterTextfield);
 
 		// Post Button
-		postButton = new PrimaryButton("Post");
 		GridBagConstraints gbc_moveSelectionPostButton = new GridBagConstraints();
 
 		gbc_moveSelectionPostButton.fill	= GridBagConstraints.BOTH;
@@ -164,8 +160,6 @@ public class ChatWindow extends JFrame {
 		contentPane.add(postButton, gbc_moveSelectionPostButton);
 
 		// Settings Button
-		settingsButton = new PrimaryButton("Settings");
-
 		GridBagConstraints gbc_moveSelectionSettingsButton = new GridBagConstraints();
 
 		gbc_moveSelectionSettingsButton.fill	= GridBagConstraints.BOTH;
@@ -207,7 +201,11 @@ public class ChatWindow extends JFrame {
 				final User			user				= selectedUserList.getSelectedValue();
 				client.setRecipient(user);
 
-				currentChat = localDB.getChats().stream().filter(chat -> chat.getRecipient().getID() == user.getID()).findFirst().get();
+				currentChat = localDB.getChats()
+					.stream()
+					.filter(chat -> chat.getRecipient().getID() == user.getID())
+					.findFirst()
+					.get();
 
 				// Set all unread messages in the chat to read
 				readCurrentChat();
@@ -241,7 +239,6 @@ public class ChatWindow extends JFrame {
 		contentPane.revalidate();
 	}
 
-
 	/**
 	 * Used to immediately reload the ChatWindow when settings were changed.
 	 * 
@@ -373,4 +370,3 @@ public class ChatWindow extends JFrame {
 	 */
 	private void readCurrentChat() { if (currentChat != null) { localDB.setMessagesToRead(currentChat); } }
 }
-

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

@@ -11,6 +11,7 @@ import javax.swing.JButton;
  * 
  * @author Kai S. K. Engelbart
  * @author Maximilian Käfer
+ * @since Envoy v0.2-alpha
  */
 public class PrimaryButton extends JButton {
 
@@ -35,8 +36,6 @@ public class PrimaryButton extends JButton {
 	 */
 	public PrimaryButton(String title, int arcSize) {
 		super(title);
-		// setForeground(new Color(255, 255, 255));
-		// setBackground(new Color(102, 51, 153));
 		setBorderPainted(false);
 		setFocusPainted(false);
 		setContentAreaFilled(false);

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

@@ -12,6 +12,7 @@ import javax.swing.border.EmptyBorder;
  * Created: <strong>07.12.2019</strong><br>
  * 
  * @author Maximilian K&auml;fer
+ * @since Envoy v0.2-alpha
  */
 public class PrimaryTextArea extends JTextArea {
 
@@ -20,7 +21,7 @@ public class PrimaryTextArea extends JTextArea {
 	private int arcSize;
 
 	/**
-	 * Creates TextArea
+	 * Creates the text area
 	 * 
 	 * @param borderSpace
 	 * @since Envoy 0.2-alpha
@@ -28,10 +29,10 @@ public class PrimaryTextArea extends JTextArea {
 	public PrimaryTextArea(int borderSpace) { this(6, borderSpace); }
 
 	/**
-	 * Creates TextArea
+	 * Creates the text area
 	 * 
 	 * @param arcSize
-	 * @param borderSpace
+	 * @param borderSpace - the insets of the border on all four sides
 	 * @since Envoy 0.2-alpha
 	 */
 	public PrimaryTextArea(int arcSize, int borderSpace) {
@@ -54,7 +55,7 @@ public class PrimaryTextArea extends JTextArea {
 	}
 
 	/**
-	 * @return the arcSize
+	 * @return the arcSize - the diameter of the arc at the four corners.
 	 * @since Envoy 0.2-alpha
 	 */
 	public int getArcSize() { return arcSize; }