diff --git a/2-0-data-structures-and-algorithms/pom.xml b/2-0-data-structures-and-algorithms/pom.xml
index f1340f395..0d5e1efe9 100644
--- a/2-0-data-structures-and-algorithms/pom.xml
+++ b/2-0-data-structures-and-algorithms/pom.xml
@@ -3,6 +3,14 @@
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
+    <dependencies>
+        <dependency>
+            <groupId>com.bobocode</groupId>
+            <artifactId>java-fundamentals-util</artifactId>
+            <version>1.0-SNAPSHOT</version>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
 
     <parent>
         <groupId>com.bobocode</groupId>
diff --git a/2-0-data-structures-and-algorithms/src/main/java/com/bobocode/linked_list/LinkedList.java b/2-0-data-structures-and-algorithms/src/main/java/com/bobocode/linked_list/LinkedList.java
index 4c1cf3d4a..7d478acdf 100644
--- a/2-0-data-structures-and-algorithms/src/main/java/com/bobocode/linked_list/LinkedList.java
+++ b/2-0-data-structures-and-algorithms/src/main/java/com/bobocode/linked_list/LinkedList.java
@@ -1,5 +1,9 @@
 package com.bobocode.linked_list;
 
+
+
+import com.bobocode.util.ExerciseNotCompletedException;
+
 import java.util.NoSuchElementException;
 
 /**
@@ -18,7 +22,7 @@ public class LinkedList<T> implements List<T> {
      * @return a new list of elements the were passed as method parameters
      */
     public static <T> List<T> of(T... elements) {
-        throw new UnsupportedOperationException("This method is not implemented yet"); // todo: implement this method
+        throw new ExerciseNotCompletedException(); // todo: implement this method
     }
 
     /**
@@ -28,7 +32,7 @@ public static <T> List<T> of(T... elements) {
      */
     @Override
     public void add(T element) {
-        throw new UnsupportedOperationException("This method is not implemented yet"); // todo: implement this method
+        throw new ExerciseNotCompletedException(); // todo: implement this method
     }
 
     /**
@@ -40,7 +44,7 @@ public void add(T element) {
      */
     @Override
     public void add(int index, T element) {
-        throw new UnsupportedOperationException("This method is not implemented yet"); // todo: implement this method
+        throw new ExerciseNotCompletedException(); // todo: implement this method
     }
 
     /**
@@ -52,7 +56,7 @@ public void add(int index, T element) {
      */
     @Override
     public void set(int index, T element) {
-        throw new UnsupportedOperationException("This method is not implemented yet"); // todo: implement this method
+        throw new ExerciseNotCompletedException(); // todo: implement this method
     }
 
     /**
@@ -64,18 +68,18 @@ public void set(int index, T element) {
      */
     @Override
     public T get(int index) {
-        throw new UnsupportedOperationException("This method is not implemented yet"); // todo: implement this method
+        throw new ExerciseNotCompletedException(); // todo: implement this method
     }
 
     /**
      * Returns the first element of the list. Operation is performed in constant time O(1)
      *
      * @return the first element of the list
-     * @throws java.util.NoSuchElementException if list is empty
+     * @throws NoSuchElementException if list is empty
      */
     @Override
     public T getFirst() {
-        throw new UnsupportedOperationException("This method is not implemented yet"); // todo: implement this method
+        throw new ExerciseNotCompletedException(); // todo: implement this method
     }
 
     /**
@@ -86,7 +90,7 @@ public T getFirst() {
      */
     @Override
     public T getLast() {
-        throw new UnsupportedOperationException("This method is not implemented yet"); // todo: implement this method
+        throw new ExerciseNotCompletedException(); // todo: implement this method
     }
 
     /**
@@ -97,7 +101,7 @@ public T getLast() {
      */
     @Override
     public void remove(int index) {
-        throw new UnsupportedOperationException("This method is not implemented yet"); // todo: implement this method
+        throw new ExerciseNotCompletedException(); // todo: implement this method
     }
 
 
@@ -108,7 +112,7 @@ public void remove(int index) {
      */
     @Override
     public boolean contains(T element) {
-        throw new UnsupportedOperationException("This method is not implemented yet"); // todo: implement this method
+        throw new ExerciseNotCompletedException(); // todo: implement this method
     }
 
     /**
@@ -118,7 +122,7 @@ public boolean contains(T element) {
      */
     @Override
     public boolean isEmpty() {
-        throw new UnsupportedOperationException("This method is not implemented yet"); // todo: implement this method
+        throw new ExerciseNotCompletedException(); // todo: implement this method
     }
 
     /**
@@ -128,7 +132,7 @@ public boolean isEmpty() {
      */
     @Override
     public int size() {
-        throw new UnsupportedOperationException("This method is not implemented yet"); // todo: implement this method
+        throw new ExerciseNotCompletedException(); // todo: implement this method
     }
 
     /**
@@ -136,6 +140,6 @@ public int size() {
      */
     @Override
     public void clear() {
-        throw new UnsupportedOperationException("This method is not implemented yet"); // todo: implement this method
+        throw new ExerciseNotCompletedException(); // todo: implement this method
     }
 }
diff --git a/3-0-java-core/pom.xml b/3-0-java-core/pom.xml
index c64260c12..e291a887e 100644
--- a/3-0-java-core/pom.xml
+++ b/3-0-java-core/pom.xml
@@ -3,6 +3,14 @@
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
+    <dependencies>
+        <dependency>
+            <groupId>com.bobocode</groupId>
+            <artifactId>java-fundamentals-util</artifactId>
+            <version>1.0-SNAPSHOT</version>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
 
     <parent>
         <groupId>com.bobocode</groupId>
diff --git a/3-0-java-core/src/main/java/com/bobocode/file_reader/FileReaders.java b/3-0-java-core/src/main/java/com/bobocode/file_reader/FileReaders.java
new file mode 100644
index 000000000..685d2d473
--- /dev/null
+++ b/3-0-java-core/src/main/java/com/bobocode/file_reader/FileReaders.java
@@ -0,0 +1,19 @@
+package com.bobocode.file_reader;
+
+import com.bobocode.util.ExerciseNotCompletedException;
+
+/**
+ * {@link FileReaders} provides an API that allow to read whole file into a {@link String} by file name.
+ */
+public class FileReaders {
+
+    /**
+     * Returns a {@link String} that contains whole text from the file specified by name.
+     *
+     * @param fileName a name of a text file
+     * @return string that holds whole file content
+     */
+    public static String readWholeFile(String fileName) {
+        throw new ExerciseNotCompletedException(); //todo
+    }
+}
diff --git a/3-0-java-core/src/test/java/com/bobocode/file_reader/FileReadersTest.java b/3-0-java-core/src/test/java/com/bobocode/file_reader/FileReadersTest.java
new file mode 100644
index 000000000..a7e4311fe
--- /dev/null
+++ b/3-0-java-core/src/test/java/com/bobocode/file_reader/FileReadersTest.java
@@ -0,0 +1,36 @@
+package com.bobocode.file_reader;
+
+import com.bobocode.file_reader.FileReaders;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+
+public class FileReadersTest {
+
+    @Test
+    void testReadWholeFileOnEmptyFile() {
+        String fileContent = FileReaders.readWholeFile("empty.txt");
+
+        assertEquals("", fileContent);
+
+    }
+
+    @Test
+    void testReadWholeFileOnFileWithEmptyLines() {
+        String fileContent = FileReaders.readWholeFile("lines.txt");
+
+        assertEquals("Hey!\n" +
+                "\n" +
+                "What's up?\n" +
+                "\n" +
+                "Hi!", fileContent);
+    }
+
+    @Test
+    void testReadWholeFile() {
+        String fileContent = FileReaders.readWholeFile("simple.txt");
+
+        assertEquals("Hello!\n" + "It's a test file.", fileContent);
+    }
+}
diff --git a/3-0-java-core/src/test/resources/empty.txt b/3-0-java-core/src/test/resources/empty.txt
new file mode 100644
index 000000000..e69de29bb
diff --git a/3-0-java-core/src/test/resources/lines.txt b/3-0-java-core/src/test/resources/lines.txt
new file mode 100644
index 000000000..7c294a97f
--- /dev/null
+++ b/3-0-java-core/src/test/resources/lines.txt
@@ -0,0 +1,5 @@
+Hey!
+
+What's up?
+
+Hi!
\ No newline at end of file
diff --git a/3-0-java-core/src/test/resources/simple.txt b/3-0-java-core/src/test/resources/simple.txt
new file mode 100644
index 000000000..ac906f0b9
--- /dev/null
+++ b/3-0-java-core/src/test/resources/simple.txt
@@ -0,0 +1,2 @@
+Hello!
+It's a test file.
\ No newline at end of file