diff --git a/code/Exercise4/pom.xml b/code/Exercise4/pom.xml
new file mode 100644
index 0000000..39ebc8b
--- /dev/null
+++ b/code/Exercise4/pom.xml
@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         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>
+
+    <groupId>fr.istic.vv</groupId>
+    <artifactId>javaparser-starter</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.source>9</maven.compiler.source>
+        <maven.compiler.target>9</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.github.javaparser</groupId>
+            <artifactId>javaparser-core</artifactId>
+            <version>3.16.2</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <!-- Creates a jar and sets the main class so it can be executed directly wit java -jar .-->
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-jar-plugin</artifactId>
+                <version>3.1.1</version>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <addClasspath>true</addClasspath>
+                            <mainClass>fr.istic.vv.Main</mainClass>
+                        </manifest>
+                    </archive>
+                </configuration>
+            </plugin>
+
+            <!-- Creates a jar containing the compiled code and all dependencies. Useful for distribution. -->
+            <plugin>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <addClasspath>true</addClasspath>
+                            <mainClass>fr.istic.vv.Main</mainClass>
+                        </manifest>
+                    </archive>
+                    <descriptorRefs>
+                        <descriptorRef>jar-with-dependencies</descriptorRef>
+                    </descriptorRefs>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>make-my-jar-with-dependencies</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
\ No newline at end of file
diff --git a/code/Exercise4/src/main/java/fr/istic/vv/Employe.java b/code/Exercise4/src/main/java/fr/istic/vv/Employe.java
new file mode 100644
index 0000000..2d1697a
--- /dev/null
+++ b/code/Exercise4/src/main/java/fr/istic/vv/Employe.java
@@ -0,0 +1,13 @@
+package fr.istic.vv;
+
+public class Employe {
+    private int age;
+    private String name;
+    private int num_badge;
+
+    public String getName() { return name; }
+
+    public boolean isAdult() {
+        return age > 17;
+    }
+}
\ No newline at end of file
diff --git a/code/Exercise4/src/main/java/fr/istic/vv/GetterChecker.java b/code/Exercise4/src/main/java/fr/istic/vv/GetterChecker.java
new file mode 100644
index 0000000..ee9cb54
--- /dev/null
+++ b/code/Exercise4/src/main/java/fr/istic/vv/GetterChecker.java
@@ -0,0 +1,41 @@
+package fr.istic.vv;
+
+import com.github.javaparser.ast.CompilationUnit;
+import com.github.javaparser.ast.body.*;
+import com.github.javaparser.ast.visitor.VoidVisitorWithDefaults;
+
+public class GetterChecker extends VoidVisitorWithDefaults<Void> {
+    @Override
+    public void visit(CompilationUnit unit, Void arg) {
+        for(TypeDeclaration<?> type : unit.getTypes()) {
+            type.accept(this, null);
+        }
+    }
+
+    @Override
+    public void visit(final ClassOrInterfaceDeclaration n, final Void arg) {
+        if (!n.isPublic())
+            return;
+        System.out.println(n.getNameAsString());
+        for (FieldDeclaration field : n.getFields()) {
+            if (!field.isPrivate()) continue;
+            for (VariableDeclarator variable : field.getVariables()) {
+                boolean hasGetter = false;
+                String fieldName = variable.getNameAsString();
+                System.out.println("---------------"+fieldName+"---------------");
+                String getterName1 = "get" + Character.toUpperCase(fieldName.charAt(0)) + fieldName.substring(1);
+
+                for (MethodDeclaration method : n.getMethods()) {
+                    if (method.getNameAsString().equals(getterName1)) {
+                        hasGetter = true;
+                        break;
+                    }
+                }
+                if (!hasGetter) {
+                    System.out.println("  Missing getter for field: " + fieldName);
+                }
+            }
+        }
+        super.visit(n, arg);
+    }
+}
\ No newline at end of file
diff --git a/code/Exercise4/src/main/java/fr/istic/vv/Main.java b/code/Exercise4/src/main/java/fr/istic/vv/Main.java
new file mode 100644
index 0000000..1d69996
--- /dev/null
+++ b/code/Exercise4/src/main/java/fr/istic/vv/Main.java
@@ -0,0 +1,37 @@
+package fr.istic.vv;
+
+import com.github.javaparser.Problem;
+import com.github.javaparser.ast.CompilationUnit;
+import com.github.javaparser.ast.body.ClassOrInterfaceDeclaration;
+import com.github.javaparser.ast.body.MethodDeclaration;
+import com.github.javaparser.ast.visitor.VoidVisitor;
+import com.github.javaparser.ast.visitor.VoidVisitorAdapter;
+import com.github.javaparser.utils.SourceRoot;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+public class Main {
+
+    public static void main(String[] args) throws IOException {
+        if(args.length == 0) {
+            System.err.println("Should provide the path to the source code");
+            System.exit(1);
+        }
+
+        File file = new File(args[0]);
+        if(!file.exists() || !file.isDirectory() || !file.canRead()) {
+            System.err.println("Provide a path to an existing readable directory");
+            System.exit(2);
+        }
+
+        SourceRoot root = new SourceRoot(file.toPath());
+        GetterChecker checker = new GetterChecker();
+        root.parse("", (localPath, absolutePath, result) -> {
+            result.ifSuccessful(unit -> unit.accept(checker, null));
+            return SourceRoot.Callback.Result.DONT_SAVE;
+        });
+    }
+}
diff --git a/code/Exercise4/src/main/java/fr/istic/vv/Person.java b/code/Exercise4/src/main/java/fr/istic/vv/Person.java
new file mode 100644
index 0000000..df741c6
--- /dev/null
+++ b/code/Exercise4/src/main/java/fr/istic/vv/Person.java
@@ -0,0 +1,12 @@
+package fr.istic.vv;
+
+public class Person {
+    private int age;
+    private String name;
+
+    public String getName() { return name; }
+
+    public boolean isAdult() {
+        return age > 17;
+    }
+}
\ No newline at end of file