diff --git a/src/main/java/com/commafeed/backend/LockMap.java b/src/main/java/com/commafeed/backend/LockMap.java
deleted file mode 100644
index 4fef65c2..00000000
--- a/src/main/java/com/commafeed/backend/LockMap.java
+++ /dev/null
@@ -1,69 +0,0 @@
-package com.commafeed.backend;
-
-import java.lang.ref.WeakReference;
-import java.util.WeakHashMap;
-
-// A map that creates and stores lock objects for arbitrary keys values.
-// Lock objects which are no longer referenced are automatically released during garbage collection.
-// Author: Christian d'Heureuse, www.source-code.biz
-// Based on IdMutexProvider by McDowell, http://illegalargumentexception.blogspot.ch/2008/04/java-synchronizing-on-transient-id.html
-// See also http://stackoverflow.com/questions/5639870/simple-java-name-based-locks
-public class LockMap<KEY> {
-
-	private WeakHashMap<KeyWrapper<KEY>, WeakReference<KeyWrapper<KEY>>> map;
-
-	public LockMap() {
-		map = new WeakHashMap<KeyWrapper<KEY>, WeakReference<KeyWrapper<KEY>>>();
-	}
-
-	// Returns a lock object for the specified key.
-	public synchronized Object get(KEY key) {
-		if (key == null) {
-			throw new NullPointerException();
-		}
-		KeyWrapper<KEY> newKeyWrapper = new KeyWrapper<KEY>(key);
-		WeakReference<KeyWrapper<KEY>> ref = map.get(newKeyWrapper);
-		KeyWrapper<KEY> oldKeyWrapper = (ref == null) ? null : ref.get();
-		if (oldKeyWrapper != null) {
-			return oldKeyWrapper;
-		}
-		map.put(newKeyWrapper,
-				new WeakReference<KeyWrapper<KEY>>(newKeyWrapper));
-		return newKeyWrapper;
-	}
-
-	// Returns the number of used entries in the map.
-	public synchronized int size() {
-		return map.size();
-	}
-
-	// KeyWrapper wraps a key value and is used in three ways:
-	// - as the key for the internal WeakHashMap
-	// - as the value for the internal WeakHashMap, additionally wrapped in a
-	// WeakReference
-	// - as the lock object associated to the key
-	private static class KeyWrapper<KEY> {
-		private KEY key;
-		private int hashCode;
-
-		public KeyWrapper(KEY key) {
-			this.key = key;
-			hashCode = key.hashCode();
-		}
-
-		public boolean equals(Object obj) {
-			if (obj == this) {
-				return true;
-			}
-			if (obj instanceof KeyWrapper) {
-				return ((KeyWrapper<?>) obj).key.equals(key);
-			}
-			return false;
-		}
-
-		public int hashCode() {
-			return hashCode;
-		}
-	}
-
-} // end class LockMap
\ No newline at end of file