diff --git a/java/src/ch/ntb/usb/Usb_Bus.java b/java/src/ch/ntb/usb/Usb_Bus.java
index b6e6742..766bc63 100644
--- a/java/src/ch/ntb/usb/Usb_Bus.java
+++ b/java/src/ch/ntb/usb/Usb_Bus.java
@@ -32,6 +32,7 @@ public class Usb_Bus {
 
 	public Usb_Device root_dev;
 
+	@Override
 	public String toString() {
 		return "Usb_Bus " + dirname;
 	}
diff --git a/java/src/ch/ntb/usb/Usb_Config_Descriptor.java b/java/src/ch/ntb/usb/Usb_Config_Descriptor.java
index 8ff6c5f..1e6e6aa 100644
--- a/java/src/ch/ntb/usb/Usb_Config_Descriptor.java
+++ b/java/src/ch/ntb/usb/Usb_Config_Descriptor.java
@@ -71,6 +71,7 @@ public class Usb_Config_Descriptor extends Usb_Descriptor {
 
 	public int extralen;
 
+	@Override
 	public String toString() {
 		return "Usb_Config_Descriptor bNumInterfaces: 0x"
 				+ Integer.toHexString(bNumInterfaces);
diff --git a/java/src/ch/ntb/usb/Usb_Device.java b/java/src/ch/ntb/usb/Usb_Device.java
index b19f5f7..268fc81 100644
--- a/java/src/ch/ntb/usb/Usb_Device.java
+++ b/java/src/ch/ntb/usb/Usb_Device.java
@@ -50,6 +50,7 @@ public class Usb_Device {
 	 */
 	public Usb_Device children;
 
+	@Override
 	public String toString() {
 		return "Usb_Device " + filename;
 	}
diff --git a/java/src/ch/ntb/usb/Usb_Device_Descriptor.java b/java/src/ch/ntb/usb/Usb_Device_Descriptor.java
index 58b8e5d..ecbb353 100644
--- a/java/src/ch/ntb/usb/Usb_Device_Descriptor.java
+++ b/java/src/ch/ntb/usb/Usb_Device_Descriptor.java
@@ -95,6 +95,7 @@ public class Usb_Device_Descriptor extends Usb_Descriptor {
 	 */
 	public byte bNumConfigurations;
 
+	@Override
 	public String toString() {
 		StringBuffer sb = new StringBuffer();
 		sb.append("Usb_Device_Descriptor idVendor: 0x"
@@ -102,4 +103,4 @@ public class Usb_Device_Descriptor extends Usb_Descriptor {
 				+ Integer.toHexString(idProduct & 0xFFFF));
 		return sb.toString();
 	}
-};
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/java/src/ch/ntb/usb/Usb_Endpoint_Descriptor.java b/java/src/ch/ntb/usb/Usb_Endpoint_Descriptor.java
index 44fdffe..f2475a3 100644
--- a/java/src/ch/ntb/usb/Usb_Endpoint_Descriptor.java
+++ b/java/src/ch/ntb/usb/Usb_Endpoint_Descriptor.java
@@ -95,6 +95,7 @@ public class Usb_Endpoint_Descriptor extends Usb_Descriptor {
 
 	public int extralen;
 
+	@Override
 	public String toString() {
 		return "Usb_Endpoint_Descriptor bEndpointAddress: 0x"
 				+ Integer.toHexString(bEndpointAddress & 0xFF);
diff --git a/java/src/ch/ntb/usb/Usb_Interface.java b/java/src/ch/ntb/usb/Usb_Interface.java
index 5726f08..199cb20 100644
--- a/java/src/ch/ntb/usb/Usb_Interface.java
+++ b/java/src/ch/ntb/usb/Usb_Interface.java
@@ -24,6 +24,7 @@ public class Usb_Interface {
 	 */
 	public int num_altsetting;
 
+	@Override
 	public String toString() {
 		return "Usb_Interface num_altsetting: 0x"
 				+ Integer.toHexString(num_altsetting);
diff --git a/java/src/ch/ntb/usb/Usb_Interface_Descriptor.java b/java/src/ch/ntb/usb/Usb_Interface_Descriptor.java
index 615602f..24109da 100644
--- a/java/src/ch/ntb/usb/Usb_Interface_Descriptor.java
+++ b/java/src/ch/ntb/usb/Usb_Interface_Descriptor.java
@@ -68,6 +68,7 @@ public class Usb_Interface_Descriptor extends Usb_Descriptor {
 
 	public int extralen;
 
+	@Override
 	public String toString() {
 		return "Usb_Interface_Descriptor bNumEndpoints: 0x"
 				+ Integer.toHexString(bNumEndpoints);
diff --git a/java/src/ch/ntb/usb/logger/LogLevel.java b/java/src/ch/ntb/usb/logger/LogLevel.java
index 0c4c0e4..a28714e 100644
--- a/java/src/ch/ntb/usb/logger/LogLevel.java
+++ b/java/src/ch/ntb/usb/logger/LogLevel.java
@@ -4,6 +4,8 @@ import java.util.logging.Level;
 
 public class LogLevel extends Level {
 
+	private static final long serialVersionUID = -8918592094095458645L;
+
 	public static final Level DEBUG = new LogLevel("DEBUG", 750);
 
 	protected LogLevel(String name, int value) {
diff --git a/java/src/ch/ntb/usb/usbView/UsbView.java b/java/src/ch/ntb/usb/usbView/UsbView.java
index 4ccce90..662aa38 100644
--- a/java/src/ch/ntb/usb/usbView/UsbView.java
+++ b/java/src/ch/ntb/usb/usbView/UsbView.java
@@ -20,6 +20,8 @@ import ch.ntb.usb.Usb_Bus;
 
 public class UsbView extends JFrame {
 
+	private static final long serialVersionUID = 4693554326612734263L;
+
 	private static final int APP_WIDTH = 600, APP_HIGHT = 800;
 
 	private JPanel jContentPane = null;
@@ -52,6 +54,7 @@ public class UsbView extends JFrame {
 		this.setContentPane(getJContentPane());
 		this.setTitle("USB View");
 		this.addWindowListener(new java.awt.event.WindowAdapter() {
+			@Override
 			public void windowClosing(java.awt.event.WindowEvent e) {
 				System.exit(0);
 			}