diff --git a/base/src/main/java/de/staropensource/sosengine/base/classes/helpers/EventHelper.java b/base/src/main/java/de/staropensource/sosengine/base/classes/helpers/EventHelper.java
index c288ab28..715598ff 100644
--- a/base/src/main/java/de/staropensource/sosengine/base/classes/helpers/EventHelper.java
+++ b/base/src/main/java/de/staropensource/sosengine/base/classes/helpers/EventHelper.java
@@ -57,7 +57,7 @@ import java.util.Set;
  */
 @Getter
 @SuppressWarnings({ "unused" })
-public class EventHelper {
+public final class EventHelper {
     /**
      * Contains all cached event listeners.
      *
diff --git a/base/src/main/java/de/staropensource/sosengine/base/internal/events/InternalEngineShutdownEvent.java b/base/src/main/java/de/staropensource/sosengine/base/internal/events/InternalEngineShutdownEvent.java
index a88ed89b..607b02f9 100644
--- a/base/src/main/java/de/staropensource/sosengine/base/internal/events/InternalEngineShutdownEvent.java
+++ b/base/src/main/java/de/staropensource/sosengine/base/internal/events/InternalEngineShutdownEvent.java
@@ -27,7 +27,7 @@ import de.staropensource.sosengine.base.classes.helpers.EventHelper;
  *
  * @since v1-alpha0
  */
-public class InternalEngineShutdownEvent implements Event {
+public final class InternalEngineShutdownEvent implements Event {
     /**
      * Constructs this class.
      */
diff --git a/base/src/main/java/de/staropensource/sosengine/base/internal/reflection/ReflectionAccessWidener.java b/base/src/main/java/de/staropensource/sosengine/base/internal/reflection/ReflectionAccessWidener.java
index 87cd50cd..b832f8db 100644
--- a/base/src/main/java/de/staropensource/sosengine/base/internal/reflection/ReflectionAccessWidener.java
+++ b/base/src/main/java/de/staropensource/sosengine/base/internal/reflection/ReflectionAccessWidener.java
@@ -32,7 +32,7 @@ import java.lang.reflect.*;
  * @since v1-alpha2
  */
 @SuppressWarnings({ "unused" })
-public class ReflectionAccessWidener {
+public final class ReflectionAccessWidener {
     /**
      * Allows access to an {@link AccessibleObject}.
      * <p>
diff --git a/base/src/main/java/de/staropensource/sosengine/base/internal/types/DependencySubsystemVector.java b/base/src/main/java/de/staropensource/sosengine/base/internal/types/DependencySubsystemVector.java
index 752915f2..ba9735f9 100644
--- a/base/src/main/java/de/staropensource/sosengine/base/internal/types/DependencySubsystemVector.java
+++ b/base/src/main/java/de/staropensource/sosengine/base/internal/types/DependencySubsystemVector.java
@@ -36,7 +36,7 @@ import java.util.List;
  */
 @SuppressWarnings({ "unused", "JavadocDeclaration", "JavadocBlankLines" })
 @Getter
-public class DependencySubsystemVector extends DependencyVector {
+public final class DependencySubsystemVector extends DependencyVector {
     /**
      * Contains the associated {@link SubsystemMainClass}.
      *
diff --git a/base/src/main/java/de/staropensource/sosengine/base/internal/types/QueuedLogMessage.java b/base/src/main/java/de/staropensource/sosengine/base/internal/types/QueuedLogMessage.java
index 3e9c2090..d95a3b58 100644
--- a/base/src/main/java/de/staropensource/sosengine/base/internal/types/QueuedLogMessage.java
+++ b/base/src/main/java/de/staropensource/sosengine/base/internal/types/QueuedLogMessage.java
@@ -31,7 +31,7 @@ import org.jetbrains.annotations.NotNull;
  */
 @SuppressWarnings({ "unused", "JavadocDeclaration", "JavadocBlankLines" })
 @Getter
-public class QueuedLogMessage {
+public final class QueuedLogMessage {
     /**
      * The log message's issuer.
      *
diff --git a/base/src/main/java/de/staropensource/sosengine/base/types/logging/LogIssuer.java b/base/src/main/java/de/staropensource/sosengine/base/types/logging/LogIssuer.java
index cb335921..84bca4cf 100644
--- a/base/src/main/java/de/staropensource/sosengine/base/types/logging/LogIssuer.java
+++ b/base/src/main/java/de/staropensource/sosengine/base/types/logging/LogIssuer.java
@@ -33,7 +33,7 @@ import org.jetbrains.annotations.Nullable;
  */
 @SuppressWarnings({ "unused", "JavadocDeclaration", "JavadocBlankLines" })
 @Getter
-public class LogIssuer {
+public final class LogIssuer {
     /**
      * Contains the issuing class.
      *
diff --git a/base/src/main/java/de/staropensource/sosengine/base/types/logging/LogRule.java b/base/src/main/java/de/staropensource/sosengine/base/types/logging/LogRule.java
index eb560291..5d24fdc6 100644
--- a/base/src/main/java/de/staropensource/sosengine/base/types/logging/LogRule.java
+++ b/base/src/main/java/de/staropensource/sosengine/base/types/logging/LogRule.java
@@ -29,7 +29,7 @@ import org.jetbrains.annotations.NotNull;
  */
 @SuppressWarnings({ "unused", "JavadocDeclaration", "JavadocBlankLines" })
 @Getter
-public class LogRule {
+public final class LogRule {
     /**
      * Determines if the log rule should disallow or permit matching log calls.
      *
diff --git a/base/src/main/java/de/staropensource/sosengine/base/utility/Math.java b/base/src/main/java/de/staropensource/sosengine/base/utility/Math.java
index 086f446c..6bba65af 100644
--- a/base/src/main/java/de/staropensource/sosengine/base/utility/Math.java
+++ b/base/src/main/java/de/staropensource/sosengine/base/utility/Math.java
@@ -27,7 +27,7 @@ import java.util.LinkedList;
 // All mean and double methods have been sourced
 // from https://stackoverflow.com/a/4191729, tysm
 @SuppressWarnings({ "unused" })
-public class Math {
+public final class Math {
     /**
      * Adds padding zeros to a number.
      *
diff --git a/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/GlfwSubsystem.java b/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/GlfwSubsystem.java
index c222f5e2..8d912caa 100644
--- a/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/GlfwSubsystem.java
+++ b/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/GlfwSubsystem.java
@@ -47,7 +47,7 @@ import static org.lwjgl.glfw.GLFW.*;
  */
 @SuppressWarnings({ "unused", "JavadocDeclaration", "JavadocBlankLines" })
 @EngineSubsystem
-public class GlfwSubsystem implements SubsystemMainClass {
+public final class GlfwSubsystem implements SubsystemMainClass {
     /**
      * Contains the class instance.
      *
diff --git a/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/callbacks/KeyCallback.java b/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/callbacks/KeyCallback.java
index ce8dbdee..8ae33fa5 100644
--- a/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/callbacks/KeyCallback.java
+++ b/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/callbacks/KeyCallback.java
@@ -35,7 +35,7 @@ import static org.lwjgl.glfw.GLFW.*;
  * @since v1-alpha2
  */
 @SuppressWarnings({ "unused" })
-public class KeyCallback extends WindowCallback implements GLFWKeyCallbackI {
+public final class KeyCallback extends WindowCallback implements GLFWKeyCallbackI {
     /**
      * A {@link InputEvent} instance, to avoid creating too many objects
      * and making too many allocations, which would potentially decrease
diff --git a/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/callbacks/MouseButtonCallback.java b/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/callbacks/MouseButtonCallback.java
index e6375352..42d58325 100644
--- a/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/callbacks/MouseButtonCallback.java
+++ b/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/callbacks/MouseButtonCallback.java
@@ -35,7 +35,7 @@ import static org.lwjgl.glfw.GLFW.*;
  * @since v1-alpha2
  */
 @SuppressWarnings({ "unused" })
-public class MouseButtonCallback extends WindowCallback implements GLFWMouseButtonCallbackI {
+public final class MouseButtonCallback extends WindowCallback implements GLFWMouseButtonCallbackI {
     /**
      * A {@link InputEvent} instance, to avoid creating too many objects
      * and making too many allocations, which would potentially decrease
diff --git a/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/classes/WindowCallback.java b/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/classes/WindowCallback.java
index de5d9a6d..40e860f6 100644
--- a/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/classes/WindowCallback.java
+++ b/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/classes/WindowCallback.java
@@ -29,6 +29,7 @@ import org.jetbrains.annotations.NotNull;
  *
  * @since v1-alpha2
  */
+@Getter
 @SuppressWarnings({ "unused", "JavadocDeclaration", "JavadocBlankLines" })
 public abstract class WindowCallback {
     /**
@@ -45,7 +46,6 @@ public abstract class WindowCallback {
      * @since v1-alpha2
      */
     @NotNull
-    @Getter
     private final Window attachedWindow;
 
     /**
diff --git a/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/exceptions/GlfwInitializationException.java b/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/exceptions/GlfwInitializationException.java
index cc025931..bc5dbde9 100644
--- a/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/exceptions/GlfwInitializationException.java
+++ b/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/exceptions/GlfwInitializationException.java
@@ -24,7 +24,7 @@ package de.staropensource.sosengine.graphics.glfw.exceptions;
  *
  * @since v1-alpha2
  */
-public class GlfwInitializationException extends RuntimeException {
+public final class GlfwInitializationException extends RuntimeException {
     /**
      * Constructs this exception.
      *
diff --git a/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/exceptions/NotOnMainThreadException.java b/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/exceptions/NotOnMainThreadException.java
index f76b0c8a..4decc51a 100644
--- a/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/exceptions/NotOnMainThreadException.java
+++ b/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/exceptions/NotOnMainThreadException.java
@@ -24,7 +24,7 @@ package de.staropensource.sosengine.graphics.glfw.exceptions;
  *
  * @since v1-alpha2
  */
-public class NotOnMainThreadException extends RuntimeException {
+public final class NotOnMainThreadException extends RuntimeException {
     /**
      * Constructs this exception.
      *
diff --git a/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/exceptions/WindowCreationFailureException.java b/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/exceptions/WindowCreationFailureException.java
index 09fab4d7..85138b17 100644
--- a/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/exceptions/WindowCreationFailureException.java
+++ b/graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/exceptions/WindowCreationFailureException.java
@@ -27,7 +27,7 @@ import org.jetbrains.annotations.NotNull;
  * @since v1-alpha2
  */
 @SuppressWarnings({ "unused" })
-public class WindowCreationFailureException extends RuntimeException {
+public final class WindowCreationFailureException extends RuntimeException {
     /**
      * Constructs this exception.
      *
diff --git a/graphics/opengl/src/main/java/de/staropensource/sosengine/graphics/opengl/OpenGlInternalApi.java b/graphics/opengl/src/main/java/de/staropensource/sosengine/graphics/opengl/OpenGlInternalApi.java
index a0dc4b6a..7935b484 100644
--- a/graphics/opengl/src/main/java/de/staropensource/sosengine/graphics/opengl/OpenGlInternalApi.java
+++ b/graphics/opengl/src/main/java/de/staropensource/sosengine/graphics/opengl/OpenGlInternalApi.java
@@ -24,7 +24,7 @@ import de.staropensource.sosengine.graphics.classes.Window;
 import de.staropensource.sosengine.graphics.opengl.classes.OpenGlWindow;
 import org.jetbrains.annotations.NotNull;
 
-public class OpenGlInternalApi implements ApiInternalClass {
+public final class OpenGlInternalApi implements ApiInternalClass {
     /** {@inheritDoc} */
     @Override
     @NotNull
diff --git a/graphics/opengl/src/main/java/de/staropensource/sosengine/graphics/opengl/classes/OpenGlWindow.java b/graphics/opengl/src/main/java/de/staropensource/sosengine/graphics/opengl/classes/OpenGlWindow.java
index cc4a00eb..fe3815d4 100644
--- a/graphics/opengl/src/main/java/de/staropensource/sosengine/graphics/opengl/classes/OpenGlWindow.java
+++ b/graphics/opengl/src/main/java/de/staropensource/sosengine/graphics/opengl/classes/OpenGlWindow.java
@@ -37,7 +37,7 @@ import static org.lwjgl.glfw.GLFW.*;
  * @since v1-alpha0
  */
 @SuppressWarnings({ "unused" })
-public class OpenGlWindow extends GlfwWindow {
+public final class OpenGlWindow extends GlfwWindow {
     // ------------------------------------------------ [ Window initialization ] ------------------------------------------------ //
     /**
      * Creates a new window.
diff --git a/graphics/src/main/java/de/staropensource/sosengine/graphics/classes/Window.java b/graphics/src/main/java/de/staropensource/sosengine/graphics/classes/Window.java
index 7ca31bea..d89d2803 100644
--- a/graphics/src/main/java/de/staropensource/sosengine/graphics/classes/Window.java
+++ b/graphics/src/main/java/de/staropensource/sosengine/graphics/classes/Window.java
@@ -566,7 +566,7 @@ public abstract class Window implements AutoCloseable {
      * @see #terminate()
      * @since v1-alpha2
      */
-    public void close() {
+    public final void close() {
         terminate();
     }
 
@@ -639,7 +639,7 @@ public abstract class Window implements AutoCloseable {
      */
     @SuppressWarnings({ "unused", "JavadocDeclaration", "JavadocBlankLines" })
     @Getter
-    public static class Builder {
+    public static final class Builder {
         /**
          * Contains the window name.
          *
diff --git a/graphics/src/main/java/de/staropensource/sosengine/graphics/events/GraphicsApiErrorEvent.java b/graphics/src/main/java/de/staropensource/sosengine/graphics/events/GraphicsApiErrorEvent.java
index 3166748f..544207bd 100644
--- a/graphics/src/main/java/de/staropensource/sosengine/graphics/events/GraphicsApiErrorEvent.java
+++ b/graphics/src/main/java/de/staropensource/sosengine/graphics/events/GraphicsApiErrorEvent.java
@@ -29,7 +29,7 @@ import org.jetbrains.annotations.NotNull;
  * @since v1-alpha0
  */
 @SuppressWarnings({ "unused" })
-public class GraphicsApiErrorEvent implements Event {
+public final class GraphicsApiErrorEvent implements Event {
     /**
      * Constructs this class.
      */
diff --git a/graphics/src/main/java/de/staropensource/sosengine/graphics/events/GraphicsApiShutdownEvent.java b/graphics/src/main/java/de/staropensource/sosengine/graphics/events/GraphicsApiShutdownEvent.java
index 33d2b4eb..aa3d38a7 100644
--- a/graphics/src/main/java/de/staropensource/sosengine/graphics/events/GraphicsApiShutdownEvent.java
+++ b/graphics/src/main/java/de/staropensource/sosengine/graphics/events/GraphicsApiShutdownEvent.java
@@ -28,7 +28,7 @@ import de.staropensource.sosengine.base.classes.helpers.EventHelper;
  * @since v1-alpha0
  */
 @SuppressWarnings({ "unused" })
-public class GraphicsApiShutdownEvent implements Event {
+public final class GraphicsApiShutdownEvent implements Event {
     /**
      * Constructs this class.
      */
diff --git a/graphics/vulkan/src/main/java/de/staropensource/sosengine/graphics/vulkan/events/GraphicsErrorEvent.java b/graphics/vulkan/src/main/java/de/staropensource/sosengine/graphics/vulkan/events/GraphicsErrorEvent.java
index afd27064..8efa4d67 100644
--- a/graphics/vulkan/src/main/java/de/staropensource/sosengine/graphics/vulkan/events/GraphicsErrorEvent.java
+++ b/graphics/vulkan/src/main/java/de/staropensource/sosengine/graphics/vulkan/events/GraphicsErrorEvent.java
@@ -27,7 +27,7 @@ import org.lwjgl.glfw.GLFWErrorCallbackI;
  * @since v1-alpha0
  */
 @SuppressWarnings({ "unused" })
-public class GraphicsErrorEvent extends de.staropensource.sosengine.graphics.events.GraphicsErrorEvent implements GLFWErrorCallbackI {
+public final class GraphicsErrorEvent extends de.staropensource.sosengine.graphics.events.GraphicsErrorEvent implements GLFWErrorCallbackI {
     /**
      * Constructs this class.
      */
diff --git a/testapp/src/main/java/de/staropensource/sosengine/testapp/Main.java b/testapp/src/main/java/de/staropensource/sosengine/testapp/Main.java
index 21360dc1..9b251553 100644
--- a/testapp/src/main/java/de/staropensource/sosengine/testapp/Main.java
+++ b/testapp/src/main/java/de/staropensource/sosengine/testapp/Main.java
@@ -47,7 +47,7 @@ import java.util.LinkedHashMap;
  * The initialization class for sos!engine's development application.
  */
 @SuppressWarnings({ "unused", "JavadocDeclaration", "JavadocBlankLines" })
-public class Main {
+public final class Main {
     /**
      * Contains the class instance.
      *