diff --git a/core-java-modules/core-java-concurrency-collections-2/src/main/java/com/baeldung/concurrent/lock/CoarseGrained.java b/core-java-modules/core-java-concurrency-collections-2/src/main/java/com/baeldung/concurrent/lock/CoarseGrained.java
deleted file mode 100644
index a9af3e1bba..0000000000
--- a/core-java-modules/core-java-concurrency-collections-2/src/main/java/com/baeldung/concurrent/lock/CoarseGrained.java
+++ /dev/null
@@ -1,39 +0,0 @@
-package com.baeldung.concurrent.lock;
-
-import java.util.Map;
-import java.util.concurrent.locks.ReentrantLock;
-
-import com.google.common.base.Supplier;
-
-public class CoarseGrained extends ConcurrentAccessMap {
-    ReentrantLock lock;
-
-    public CoarseGrained(Map<String, String> map) {
-        super(map);
-        lock = new ReentrantLock();
-    }
-
-    protected Supplier<?> putSupplier(int x) {
-        return (()-> {
-            boolean done = false;
-            while(!done) {
-                done = lock.tryLock();
-            }
-            map.put("key" + x, "value" + x);
-            lock.unlock();
-            return null;
-        });
-    }
-
-    protected Supplier<?> getSupplier(int x) {
-        return (()-> {
-            boolean done = false;
-            while(!done) {
-                done = lock.tryLock();
-            }
-            map.get("key" + x);
-            lock.unlock();
-            return null;
-        });
-    }
-}