diff --git a/libraries-3/README.md b/libraries-3/README.md
index 922ce1bd1a..ec433960ef 100644
--- a/libraries-3/README.md
+++ b/libraries-3/README.md
@@ -12,7 +12,6 @@ Remember, for advanced libraries like [Jackson](/jackson) and [JUnit](/testing-m
 - [Guide to the Cactoos Library](https://www.baeldung.com/java-cactoos)
 - [Parsing Command-Line Parameters with Airline](https://www.baeldung.com/java-airline)
 - [Introduction to cache2k](https://www.baeldung.com/java-cache2k)
-- [Using NullAway to Avoid NullPointerExceptions](https://www.baeldung.com/java-nullaway)
 - [Introduction to the jcabi-aspects AOP Annotations Library](https://www.baeldung.com/java-jcabi-aspects)
 - [Introduction to Takes](https://www.baeldung.com/java-takes)
 - [Using NullAway to Avoid NullPointerExceptions](https://www.baeldung.com/java-nullaway)
diff --git a/libraries-3/src/main/java/com/baeldung/distinct/Person.java b/libraries-3/src/main/java/com/baeldung/distinct/Person.java
deleted file mode 100644
index 8a2a5f7a45..0000000000
--- a/libraries-3/src/main/java/com/baeldung/distinct/Person.java
+++ /dev/null
@@ -1,65 +0,0 @@
-package com.baeldung.distinct;
-
-public class Person {
-    int age;
-    String name;
-    String email;
-
-    public Person(int age, String name, String email) {
-        super();
-        this.age = age;
-        this.name = name;
-        this.email = email;
-    }
-
-    public int getAge() {
-        return age;
-    }
-
-    public String getName() {
-        return name;
-    }
-
-    public String getEmail() {
-        return email;
-    }
-
-    @Override
-    public String toString() {
-        StringBuilder builder = new StringBuilder();
-        builder.append("Person [age=");
-        builder.append(age);
-        builder.append(", name=");
-        builder.append(name);
-        builder.append(", email=");
-        builder.append(email);
-        builder.append("]");
-        return builder.toString();
-    }
-
-    @Override
-    public int hashCode() {
-        final int prime = 31;
-        int result = 1;
-        result = prime * result + ((email == null) ? 0 : email.hashCode());
-        return result;
-    }
-
-    @Override
-    public boolean equals(Object obj) {
-        if (this == obj)
-            return true;
-        if (obj == null)
-            return false;
-        if (getClass() != obj.getClass())
-            return false;
-        Person other = (Person) obj;
-        if (email == null) {
-            if (other.email != null)
-                return false;
-        } else if (!email.equals(other.email))
-            return false;
-        return true;
-    }
-
-}