diff --git a/src/main/java/de/ailis/usb4java/DeviceId.java b/src/main/java/de/ailis/usb4java/DeviceId.java
index b803f24..9d3ddb6 100644
--- a/src/main/java/de/ailis/usb4java/DeviceId.java
+++ b/src/main/java/de/ailis/usb4java/DeviceId.java
@@ -48,8 +48,7 @@ public final class DeviceId implements Serializable
      *            The device descriptor. Must not be null.
      */
     public DeviceId(final int busNumber, final int deviceAddress,
-        int portNumber,
-        final SimpleUsbDeviceDescriptor deviceDescriptor)
+        final int portNumber, final SimpleUsbDeviceDescriptor deviceDescriptor)
     {
         if (deviceDescriptor == null)
             throw new IllegalArgumentException("deviceDescriptor must be set");
@@ -71,7 +70,7 @@ public final class DeviceId implements Serializable
     }
 
     @Override
-    public boolean equals(Object obj)
+    public boolean equals(final Object obj)
     {
         if (this == obj) return true;
         if (obj == null) return false;
diff --git a/src/main/java/de/ailis/usb4java/Usb4JavaConfiguration.java b/src/main/java/de/ailis/usb4java/Usb4JavaConfiguration.java
index f78cead..5c646c7 100644
--- a/src/main/java/de/ailis/usb4java/Usb4JavaConfiguration.java
+++ b/src/main/java/de/ailis/usb4java/Usb4JavaConfiguration.java
@@ -146,7 +146,7 @@ public final class Usb4JavaConfiguration implements UsbConfiguration
     }
 
     @Override
-    public Usb4JavaInterface getUsbInterface(byte number)
+    public Usb4JavaInterface getUsbInterface(final byte number)
     {
         return this.activeSettings.get(number & 0xff);
     }
@@ -177,7 +177,7 @@ public final class Usb4JavaConfiguration implements UsbConfiguration
     }
     
     @Override
-    public boolean containsUsbInterface(byte number)
+    public boolean containsUsbInterface(final byte number)
     {
         return this.activeSettings.containsKey(number & 0xff);
     }
diff --git a/src/main/java/de/ailis/usb4java/Usb4JavaDevice.java b/src/main/java/de/ailis/usb4java/Usb4JavaDevice.java
index 571c264..58070d3 100644
--- a/src/main/java/de/ailis/usb4java/Usb4JavaDevice.java
+++ b/src/main/java/de/ailis/usb4java/Usb4JavaDevice.java
@@ -164,7 +164,7 @@ public class Usb4JavaDevice implements UsbDevice
     }
 
     @Override
-    public boolean equals(Object obj)
+    public boolean equals(final Object obj)
     {
         if (this == obj) return true;
         if (obj == null) return false;
@@ -355,13 +355,13 @@ public class Usb4JavaDevice implements UsbDevice
     }
 
     @Override
-    public Usb4JavaConfiguration getUsbConfiguration(byte number)
+    public Usb4JavaConfiguration getUsbConfiguration(final byte number)
     {
         return this.configMapping.get(number);
     }
 
     @Override
-    public boolean containsUsbConfiguration(byte number)
+    public boolean containsUsbConfiguration(final byte number)
     {
         return this.configMapping.containsKey(number);
     }
@@ -500,7 +500,7 @@ public class Usb4JavaDevice implements UsbDevice
     }
 
     @Override
-    public UsbStringDescriptor getUsbStringDescriptor(byte index)
+    public UsbStringDescriptor getUsbStringDescriptor(final byte index)
         throws UsbException
     {
         checkConnected();
@@ -517,7 +517,7 @@ public class Usb4JavaDevice implements UsbDevice
     }
 
     @Override
-    public String getString(byte index) throws UsbException,
+    public String getString(final byte index) throws UsbException,
         UnsupportedEncodingException
     {
         return getUsbStringDescriptor(index).getString();
@@ -550,7 +550,7 @@ public class Usb4JavaDevice implements UsbDevice
     }
 
     @Override
-    public void syncSubmit(UsbControlIrp irp) throws UsbException
+    public void syncSubmit(final UsbControlIrp irp) throws UsbException
     {
         if (irp == null)
             throw new IllegalArgumentException("irp must not be null");
@@ -561,7 +561,7 @@ public class Usb4JavaDevice implements UsbDevice
     }
 
     @Override
-    public void asyncSubmit(UsbControlIrp irp)
+    public void asyncSubmit(final UsbControlIrp irp)
     {
         if (irp == null)
             throw new IllegalArgumentException("irp must not be null");
@@ -570,7 +570,7 @@ public class Usb4JavaDevice implements UsbDevice
     }
 
     @Override
-    public void syncSubmit(List list) throws UsbException
+    public void syncSubmit(final List list) throws UsbException
     {
         if (list == null)
             throw new IllegalArgumentException("list must not be null");
@@ -585,7 +585,7 @@ public class Usb4JavaDevice implements UsbDevice
     }
 
     @Override
-    public void asyncSubmit(List list)
+    public void asyncSubmit(final List list)
     {
         if (list == null)
             throw new IllegalArgumentException("list must not be null");
@@ -600,21 +600,21 @@ public class Usb4JavaDevice implements UsbDevice
     }
 
     @Override
-    public UsbControlIrp createUsbControlIrp(byte bmRequestType, byte bRequest,
-        short wValue, short wIndex)
+    public UsbControlIrp createUsbControlIrp(final byte bmRequestType, 
+        final byte bRequest, final short wValue, final short wIndex)
     {
         return new DefaultUsbControlIrp(bmRequestType, bRequest, wValue,
             wIndex);
     }
 
     @Override
-    public void addUsbDeviceListener(UsbDeviceListener listener)
+    public void addUsbDeviceListener(final UsbDeviceListener listener)
     {
         this.listeners.add(listener);
     }
 
     @Override
-    public void removeUsbDeviceListener(UsbDeviceListener listener)
+    public void removeUsbDeviceListener(final UsbDeviceListener listener)
     {
         this.listeners.remove(listener);
     }
diff --git a/src/main/java/de/ailis/usb4java/Usb4JavaHub.java b/src/main/java/de/ailis/usb4java/Usb4JavaHub.java
index 1f0f327..9906206 100644
--- a/src/main/java/de/ailis/usb4java/Usb4JavaHub.java
+++ b/src/main/java/de/ailis/usb4java/Usb4JavaHub.java
@@ -103,7 +103,7 @@ public final class Usb4JavaHub extends Usb4JavaDevice implements UsbHub,
     }    
     
     @Override
-    public boolean equals(Object obj)
+    public boolean equals(final Object obj)
     {
         if (this == obj) return true;
         if (obj == null) return false;
diff --git a/src/main/java/de/ailis/usb4java/UsbDeviceManager.java b/src/main/java/de/ailis/usb4java/UsbDeviceManager.java
index 11fcca2..c6325f8 100644
--- a/src/main/java/de/ailis/usb4java/UsbDeviceManager.java
+++ b/src/main/java/de/ailis/usb4java/UsbDeviceManager.java
@@ -270,7 +270,7 @@ public final class UsbDeviceManager
      * @param device
      *            The device to release. Must not be null.
      */
-    public void releaseDevice(Device device)
+    public void releaseDevice(final Device device)
     {
         if (device == null)
             throw new IllegalArgumentException("device must be set");
diff --git a/src/main/java/de/ailis/usb4java/libusb/LibUSB.java b/src/main/java/de/ailis/usb4java/libusb/LibUSB.java
index ff9fe63..0c9bca6 100644
--- a/src/main/java/de/ailis/usb4java/libusb/LibUSB.java
+++ b/src/main/java/de/ailis/usb4java/libusb/LibUSB.java
@@ -581,7 +581,7 @@ public final class LibUSB
      *            Whether to unref the devices in the list.
      */
     public static native void freeDeviceList(final DeviceList list,
-        boolean unrefDevices);
+        final boolean unrefDevices);
 
     /**
      * Get the number of the bus that a device is connected to.
@@ -615,7 +615,7 @@ public final class LibUSB
      *         array is too small
      */
     public static native int getPortPath(final Context context,
-        final Device device, byte[] path);
+        final Device device, final byte[] path);
 
     /**
      * Get the the parent from the specified device [EXPERIMENTAL].
@@ -671,7 +671,7 @@ public final class LibUSB
      *         does not exist {@link #ERROR_OTHER} on other failure
      */
     public static native int getMaxPacketSize(final Device device,
-        int endpoint);
+        final int endpoint);
 
     /**
      * Calculate the maximum packet size which a specific endpoint is capable
@@ -702,7 +702,7 @@ public final class LibUSB
      *         {@link #ERROR_OTHER} on other failure.
      */
     public static native int getMaxIsoPacketSize(final Device device,
-        int endpoint);
+        final int endpoint);
 
     /**
      * Increment the reference count of a device.
@@ -940,7 +940,7 @@ public final class LibUSB
      *         another ERROR code on other failure
      */
     public static native int setInterfaceAltSetting(final DeviceHandle handle,
-        int interfaceNumber, int alternateSetting);
+        final int interfaceNumber, final int alternateSetting);
 
     /**
      * Clear the halt/stall condition for an endpoint.
@@ -961,7 +961,8 @@ public final class LibUSB
      *         exist, {@link #ERROR_NO_DEVICE} if the device has been
      *         disconnected, another ERROR code on other failure.
      */
-    public static native int clearHalt(final DeviceHandle handle, int endpoint);
+    public static native int clearHalt(final DeviceHandle handle,
+        final int endpoint);
 
     /**
      * Perform a USB port reset to reinitialize a device.
@@ -1323,7 +1324,7 @@ public final class LibUSB
      */
     public static native int controlTransfer(final DeviceHandle handle,
         final int bmRequestType, final int bRequest, final int wValue,
-        int wIndex, final ByteBuffer data, final int timeout);
+        final int wIndex, final ByteBuffer data, final int timeout);
 
     /**
      * Perform a USB bulk transfer.