diff --git a/example/src/main/java/com/markozajc/akiwrapper/example/AkinatorExample.java b/example/src/main/java/com/markozajc/akiwrapper/example/AkinatorExample.java
index 5715aa5..be63603 100644
--- a/example/src/main/java/com/markozajc/akiwrapper/example/AkinatorExample.java
+++ b/example/src/main/java/com/markozajc/akiwrapper/example/AkinatorExample.java
@@ -80,9 +80,9 @@ public static void main(String[] args) throws Exception {
 			Akiwrapper aw;
 			try {
 				aw = new AkiwrapperBuilder().setFilterProfanity(filterProfanity)
-				    .setLanguage(language)
-				    .setGuessType(guessType)
-				    .build();
+					.setLanguage(language)
+					.setGuessType(guessType)
+					.build();
 			} catch (ServerNotFoundException e) {
 				System.err.println("Invalid combination of language and guess type. Try a different guess type.");
 				return;
@@ -107,8 +107,8 @@ public static void main(String[] args) throws Exception {
 				// Displays the question.
 
 				if (question.getStep() == 0)
-					System.out.println(
-					    "\nAnswer with Y (yes), N (no), DK (don't know), P (probably) or PN (probably not) or go back in time with B (back).");
+					System.out
+						.println("\nAnswer with Y (yes), N (no), DK (don't know), P (probably) or PN (probably not) or go back in time with B (back).");
 				// Displays the tip (only for the first time).
 
 				answerQuestion(sc, aw);
@@ -141,7 +141,7 @@ private static void reviewGuesses(@Nonnull Scanner sc, @Nonnull Akiwrapper aw, @
 					System.exit(0);
 				}
 
-				declined.add(Long.valueOf(guess.getIdLong()));
+				declined.add(guess.getIdLong());
 				// Registers this guess as rejected.
 			}
 
@@ -177,16 +177,15 @@ private static void answerQuestion(@Nonnull Scanner sc, @Nonnull Akiwrapper aw)
 				ApiKey.accquireApiKey();
 
 			} else if (answer.equals("debug")) {
-				System.out.println("Debug information:\n\tCurrent API server: "
-				    + aw.getServer().getUrl()
-				    + "\n\tCurrent guess count: "
-				    + aw.getGuesses().size());
+				System.out.println("Debug information:\n\tCurrent API server: " + aw.getServer().getUrl() +
+					"\n\tCurrent guess count: " +
+					aw.getGuesses().size());
 				continue;
 				// Displays some debug information.
 
 			} else {
-				System.out.println(
-				    "Please answer with either [Y]ES, [N]O, [D|ONT |K]NOW, [P]ROBABLY or [P|ROBABLY |N]OT or go back one step with [B]ACK.");
+				System.out
+					.println("Please answer with either [Y]ES, [N]O, [D|ONT |K]NOW, [P]ROBABLY or [P|ROBABLY |N]OT or go back one step with [B]ACK.");
 				continue;
 			}
 
@@ -224,8 +223,8 @@ private static Language getLanguage(@Nonnull Scanner sc) {
 		EnumSet<Language> languages = EnumSet.allOf(Language.class);
 		// Fetches all available languages.
 
-		String unsupportedLanguageMessage = "Sorry, that language isn't supported. Rather try with:"
-		    + languages.stream().map(Enum::toString).collect(Collectors.joining("\n-", "\n-", ""));
+		String unsupportedLanguageMessage = "Sorry, that language isn't supported. Rather try with:" +
+			languages.stream().map(Enum::toString).collect(Collectors.joining("\n-", "\n-", ""));
 		// Does some Java 8 magic to pre-prepare the error message.
 
 		System.out.println("What's your language? (English)");
@@ -238,9 +237,9 @@ private static Language getLanguage(@Nonnull Scanner sc) {
 			}
 
 			Language matching = languages.stream()
-			    .filter(l -> l.toString().toLowerCase().equals(selectedLanguage))
-			    .findAny()
-			    .orElse(null);
+				.filter(l -> l.toString().toLowerCase().equals(selectedLanguage))
+				.findAny()
+				.orElse(null);
 
 			if (matching == null) {
 				System.out.println(unsupportedLanguageMessage);
@@ -258,8 +257,8 @@ private static GuessType getGuessType(@Nonnull Scanner sc) {
 		EnumSet<GuessType> guessTypes = EnumSet.allOf(GuessType.class);
 		// Fetches all available guess types.
 
-		String unsupportedGuessTypeMessage = "Sorry, that guess type isn't supported. Rather try with:"
-		    + guessTypes.stream().map(Enum::toString).collect(Collectors.joining("\n-", "\n-", ""));
+		String unsupportedGuessTypeMessage = "Sorry, that guess type isn't supported. Rather try with:" +
+			guessTypes.stream().map(Enum::toString).collect(Collectors.joining("\n-", "\n-", ""));
 		// Does some Java 8 magic to pre-prepare the error message.
 
 		System.out.println("What will you be guessing? (character)");
@@ -272,9 +271,9 @@ private static GuessType getGuessType(@Nonnull Scanner sc) {
 			}
 
 			GuessType matching = guessTypes.stream()
-			    .filter(l -> l.toString().toLowerCase().equals(selectedGuessType))
-			    .findAny()
-			    .orElse(null);
+				.filter(l -> l.toString().toLowerCase().equals(selectedGuessType))
+				.findAny()
+				.orElse(null);
 
 			if (matching == null) {
 				System.out.println(unsupportedGuessTypeMessage);
diff --git a/pom.xml b/pom.xml
index 91f82d4..bea9637 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
 
 	<groupId>com.github.markozajc</groupId>
 	<artifactId>akiwrapper</artifactId>
-	<version>1.5.1</version>
+	<version>1.5.1.1</version>
 
 	<name>Akiwrapper</name>
 	<description>A Java API wrapper for Akinator</description>
@@ -43,6 +43,8 @@
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 		<junit.version>5.7.1</junit.version>
 		<slf4j.version>1.7.30</slf4j.version>
+		<maven.compiler.source>11</maven.compiler.source>
+		<maven.compiler.target>11</maven.compiler.target>
 	</properties>
 
 	<dependencies>
@@ -57,7 +59,7 @@
 		<dependency>
 			<groupId>org.json</groupId>
 			<artifactId>json</artifactId>
-			<version>20201115</version>
+			<version>20210307</version>
 		</dependency>
 
 		<!-- Unit tests -->
@@ -87,13 +89,6 @@
 			<version>3.11.11</version>
 		</dependency>
 
-		<!-- Cache -->
-		<dependency>
-			<groupId>com.google.guava</groupId>
-			<artifactId>guava</artifactId>
-			<version>30.1-jre</version>
-		</dependency>
-
 		<!-- Logging -->
 		<dependency>
 			<groupId>org.slf4j</groupId>
@@ -111,7 +106,7 @@
 		<dependency>
 			<groupId>com.github.spotbugs</groupId>
 			<artifactId>spotbugs-annotations</artifactId>
-			<version>4.2.1</version>
+			<version>4.2.2</version>
 		</dependency>
 
 		<dependency>
@@ -125,15 +120,6 @@
 	<build>
 		<plugins>
 
-			<!-- Compiler -->
-			<plugin>
-				<artifactId>maven-compiler-plugin</artifactId>
-				<version>3.8.1</version>
-				<configuration>
-					<release>11</release>
-				</configuration>
-			</plugin>
-
 			<!-- Javadoc -->
 			<plugin>
 				<artifactId>maven-javadoc-plugin</artifactId>
@@ -169,7 +155,10 @@
 			<plugin>
 				<groupId>org.codehaus.mojo</groupId>
 				<artifactId>versions-maven-plugin</artifactId>
-				<version>2.7</version>
+				<version>2.8.1</version>
+				<configuration>
+					<rulesUri>file://${project.basedir}/versions-ruleset.xml</rulesUri>
+				</configuration>
 			</plugin>
 
 		</plugins>
diff --git a/src/main/java/com/markozajc/akiwrapper/AkiwrapperBuilder.java b/src/main/java/com/markozajc/akiwrapper/AkiwrapperBuilder.java
index 170cc35..ad429a2 100644
--- a/src/main/java/com/markozajc/akiwrapper/AkiwrapperBuilder.java
+++ b/src/main/java/com/markozajc/akiwrapper/AkiwrapperBuilder.java
@@ -31,6 +31,21 @@ public AkiwrapperBuilder() {
 			  AkiwrapperMetadata.DEFAULT_GUESS_TYPE);
 	}
 
+	/**
+	 * Sets the {@link Server} or (recommended) a {@link ServerList}. It is not
+	 * recommended to set the {@link Server} manually (unless for debugging purposes or
+	 * as some kind of workaround where Akiwrapper's server finder fails) as Akiwrapper
+	 * already does its best to find the most suitable one. <br>
+	 * <b>Caution!</b> Setting the server to a non-null value overwrites the
+	 * {@link Language} and the {@link GuessType} with the given {@link Server}'s values.
+	 *
+	 * @param server
+	 *
+	 * @return current instance, used for chaining
+	 *
+	 * @see #getServer()
+	 * @see Servers#findServers(Language, GuessType)
+	 */
 	@Override
 	public AkiwrapperBuilder setServer(Server server) {
 		super.setServer(server);
@@ -38,6 +53,15 @@ public AkiwrapperBuilder setServer(Server server) {
 		return this;
 	}
 
+	/**
+	 * Sets the "filter profanity" mode.
+	 *
+	 * @param filterProfanity
+	 *
+	 * @return current instance, used for chaining
+	 *
+	 * @see #doesFilterProfanity()
+	 */
 	@Override
 	public AkiwrapperBuilder setFilterProfanity(boolean filterProfanity) {
 		super.setFilterProfanity(filterProfanity);
@@ -45,13 +69,35 @@ public AkiwrapperBuilder setFilterProfanity(boolean filterProfanity) {
 		return this;
 	}
 
+	/**
+	 * Sets the {@link Language}.<br>
+	 * <b>Caution!</b> Setting the {@link Language} will set the {@link Server} to
+	 * {@code null} (meaning it will be automatically selected).
+	 *
+	 * @param language
+	 *
+	 * @return current instance, used for chaining
+	 *
+	 * @see #getLanguage()
+	 */
 	@Override
-	public AkiwrapperBuilder setLanguage(Language localization) {
-		super.setLanguage(localization);
+	public AkiwrapperBuilder setLanguage(Language language) {
+		super.setLanguage(language);
 
 		return this;
 	}
 
+	/**
+	 * Sets the {@link GuessType}.<br>
+	 * <b>Caution!</b> Setting the {@link Language} will set the {@link Server} to
+	 * {@code null} (meaning it will be automatically selected).
+	 *
+	 * @param guessType
+	 *
+	 * @return current instance, used for chaining
+	 *
+	 * @see #getLanguage()
+	 */
 	@Override
 	public AkiwrapperBuilder setGuessType(GuessType guessType) {
 		super.setGuessType(guessType);
diff --git a/src/main/java/com/markozajc/akiwrapper/core/Route.java b/src/main/java/com/markozajc/akiwrapper/core/Route.java
index a2db855..04b0007 100644
--- a/src/main/java/com/markozajc/akiwrapper/core/Route.java
+++ b/src/main/java/com/markozajc/akiwrapper/core/Route.java
@@ -10,7 +10,6 @@
 import org.slf4j.*;
 
 import com.markozajc.akiwrapper.core.entities.Status;
-import com.markozajc.akiwrapper.core.entities.Status.Level;
 import com.markozajc.akiwrapper.core.entities.impl.immutable.*;
 import com.markozajc.akiwrapper.core.exceptions.*;
 import com.markozajc.akiwrapper.core.impl.AkiwrapperImpl.Token;
@@ -18,17 +17,8 @@
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import kong.unirest.*;
 
-/**
- * A class defining various API endpoints. It is capable of building such
- * {@link Route}s into {@link Request}s, which can then easily be executed and read.
- *
- * @author Marko Zajc
- */
 public final class Route {
 
-	/**
-	 * A public {@link UnirestInstance} with all required default headers set.
-	 */
 	public static final UnirestInstance UNIREST;
 
 	static {
@@ -54,9 +44,6 @@ public final class Route {
 		// probably doesn't even store cookies right.
 	}
 
-	/**
-	 * The base Akinator URL, used for scraping and some API calls.
-	 */
 	public static final String BASE_AKINATOR_URL = "https://en.akinator.com";
 	private static final String SERVER_DOWN_STATUS_MESSAGE = "server down";
 	private static final Pattern FILTER_ARGUMENT_PATTERN = Pattern.compile("\\{FILTER\\}");
@@ -130,18 +117,6 @@ private Route(int parameters, @Nonnull String path, @Nonnull String... filterArg
 		this.parametersQuantity = parameters;
 	}
 
-	/**
-	 * Tests whether a response is a successful or a failed one.
-	 *
-	 * @param response
-	 *            the response to test
-	 *
-	 * @throws ServerUnavailableException
-	 *             throws if the status is equal to {@link Level#ERROR} and the error
-	 *             message hints that the server is down
-	 * @throws StatusException
-	 *             thrown if the status is equal to {@link Level#ERROR}
-	 */
 	public static void testResponse(@Nonnull JSONObject response) {
 		Status completion = new StatusImpl(response);
 		if (completion.getLevel() == Status.Level.ERROR) {
@@ -152,20 +127,6 @@ public static void testResponse(@Nonnull JSONObject response) {
 		}
 	}
 
-	/**
-	 * Constructs a {@link Request} for a route that can later be executed and converted
-	 * into a {@link JSONObject}.
-	 *
-	 * @param baseUrl
-	 * @param filterProfanity
-	 * @param token
-	 * @param parameters
-	 *
-	 * @return a {@link Request}.
-	 *
-	 * @throws IllegalArgumentException
-	 *             if you have passed too little parameters.
-	 */
 	@Nonnull
 	public Request getRequest(@Nonnull String baseUrl, boolean filterProfanity, @Nullable Token token,
 							  @Nonnull String... parameters) {
@@ -207,53 +168,20 @@ public Request getRequest(@Nonnull String baseUrl, boolean filterProfanity, @Nul
 		return new Request(baseUrl + formattedPath, jQueryCallback);
 	}
 
-	/**
-	 * Constructs a {@link Request} for a route that can later be executed and converted
-	 * into a {@link JSONObject}. The resulting {@link Request} does not perform any
-	 * session authentication with a {@link Token}.
-	 *
-	 * @param baseUrl
-	 * @param filterProfanity
-	 * @param parameters
-	 *
-	 * @return a {@link Request}.
-	 *
-	 * @throws IllegalArgumentException
-	 *             if you have passed too little parameters.
-	 */
 	@Nonnull
 	public Request getRequest(@Nonnull String baseUrl, boolean filterProfanity, @Nonnull String... parameters) {
 		return this.getRequest(baseUrl, filterProfanity, null, parameters);
 	}
 
-	/**
-	 * Returns {@link Route}'s unformatted path.
-	 *
-	 * @return route's path.
-	 */
 	@Nonnull
 	public String getPath() {
 		return this.path;
 	}
 
-	/**
-	 * Returns the minimal quantity of parameters that must be passed to
-	 * {@link #getRequest(String, boolean, String...)} and
-	 * {@link #getRequest(String, boolean, Token, String...)}. If the amount of passed
-	 * parameters is lower than this number, an {@link IllegalArgumentException} is
-	 * thrown.
-	 *
-	 * @return minimal quantity of parameters.
-	 */
 	public int getParametersQuantity() {
 		return this.parametersQuantity;
 	}
 
-	/**
-	 * An executable request.
-	 *
-	 * @author Marko Zajc
-	 */
 	public static class Request {
 
 		private static final Logger LOG = LoggerFactory.getLogger(Route.Request.class);
@@ -268,35 +196,11 @@ public static class Request {
 			this.url = url;
 		}
 
-		/**
-		 * Requests the server and returns the route's content as a {@link JSONObject}.
-		 *
-		 * @return route's content
-		 *
-		 * @throws ServerUnavailableException
-		 *             if the server has gone down
-		 * @throws StatusException
-		 *             if the server returns an error response.
-		 */
 		@Nonnull
 		public JSONObject getJSON() {
 			return getJSON(defaultRunChecks);
 		}
 
-		/**
-		 * Requests the server and returns the route's content as a {@link JSONObject}.
-		 *
-		 * @param runChecks
-		 *            whether to run checks for error status codes.
-		 *
-		 * @return route's content
-		 *
-		 * @throws ServerUnavailableException
-		 *             if the server has gone down.
-		 * @throws StatusException
-		 *             if the server returns an error response.
-		 *
-		 */
 		@Nonnull
 		public JSONObject getJSON(boolean runChecks) {
 			String response = UNIREST.get(this.url).asString().getBody().replace(this.jQueryCallback, "");
diff --git a/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/ApiKey.java b/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/ApiKey.java
index fd0b105..f9eab92 100644
--- a/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/ApiKey.java
+++ b/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/ApiKey.java
@@ -7,16 +7,7 @@
 import javax.annotation.Nonnull;
 
 import com.markozajc.akiwrapper.core.Route;
-import com.markozajc.akiwrapper.core.exceptions.StatusException;
 
-/**
- * A class defining the session key that has to be passed to the
- * {@link Route#NEW_SESSION} endpoint. It is scraped from the website as it is
- * single-use and triggers a KO if reused.
- *
- * @author Marko Zajc
- *
- */
 public class ApiKey {
 
 	private static final Pattern API_KEY_PATTERN =
@@ -34,11 +25,6 @@ public class ApiKey {
 		this.frontAddress = frontAddress;
 	}
 
-	/**
-	 * Compiles this {@link ApiKey} into querystring that can be appended to an endpoint.
-	 *
-	 * @return compiled querystring.
-	 */
 	@SuppressWarnings("null")
 	@Nonnull
 	public String compile() {
@@ -49,17 +35,6 @@ public String compile() {
 		}
 	}
 
-	/**
-	 * Finds and scrapes the API key from Akinator's website and constructs an
-	 * {@link ApiKey} instance from it. <br>
-	 * <b>Caution!</b>Each {@link ApiKey} is single-use! Reusing it will trigger a
-	 * {@link StatusException} from the API server.
-	 *
-	 * @return an {@link ApiKey}.
-	 *
-	 * @throws IllegalStateException
-	 *             if the API key can't be scraped
-	 */
 	@SuppressWarnings("null")
 	public static ApiKey accquireApiKey() {
 		Matcher matcher =
diff --git a/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/GuessImpl.java b/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/GuessImpl.java
index 9acbe19..9918f47 100644
--- a/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/GuessImpl.java
+++ b/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/GuessImpl.java
@@ -4,17 +4,11 @@
 
 import javax.annotation.*;
 
-import org.json.*;
+import org.json.JSONObject;
 
-import com.markozajc.akiwrapper.core.Route;
 import com.markozajc.akiwrapper.core.entities.Guess;
 import com.markozajc.akiwrapper.core.utils.JSONUtils;
 
-/**
- * An implementation of {@link Guess}.
- *
- * @author Marko Zajc
- */
 public class GuessImpl implements Guess {
 
 	@Nonnull
@@ -28,15 +22,6 @@ public class GuessImpl implements Guess {
 	@Nonnegative
 	private final double probability;
 
-	/**
-	 * Creates a new {@link GuessImpl} instance from raw parameters.
-	 *
-	 * @param id
-	 * @param name
-	 * @param description
-	 * @param image
-	 * @param probability
-	 */
 	public GuessImpl(@Nonnull String id, @Nonnull String name, @Nullable String description, @Nullable URL image,
 					 @Nonnegative double probability) {
 		this.id = id;
@@ -46,14 +31,6 @@ public GuessImpl(@Nonnull String id, @Nonnull String name, @Nullable String desc
 		this.probability = probability;
 	}
 
-	/**
-	 * Creates a new {@link GuessImpl} instance.
-	 *
-	 * @param json
-	 *            JSON parameters to use (acquired with {@link Route#LIST} &gt;
-	 *            {@link JSONArray} elements &gt; {@link JSONObject} (an index) &gt;
-	 *            {@link JSONObject} element)
-	 */
 	@SuppressWarnings("null")
 	public GuessImpl(@Nonnull JSONObject json) {
 		this(json.getString("id"), json.getString("name"), getDescription(json), getImage(json),
diff --git a/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/ImmutableAkiwrapperMetadata.java b/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/ImmutableAkiwrapperMetadata.java
deleted file mode 100644
index d7e813f..0000000
--- a/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/ImmutableAkiwrapperMetadata.java
+++ /dev/null
@@ -1,63 +0,0 @@
-package com.markozajc.akiwrapper.core.entities.impl.immutable;
-
-import javax.annotation.*;
-
-import com.markozajc.akiwrapper.core.entities.*;
-import com.markozajc.akiwrapper.core.entities.Server.*;
-
-/**
- * An immutable implementation of {@link AkiwrapperMetadata}.
- *
- * @author Marko Zajc
- */
-public abstract class ImmutableAkiwrapperMetadata extends AkiwrapperMetadata {
-
-	@Nullable
-	protected final Server server;
-	protected final boolean filterProfanity;
-	@Nonnull
-	protected final Language localization;
-	@Nonnull
-	protected final GuessType guessType;
-
-	/**
-	 * Creates a new {@link ImmutableAkiwrapperMetadata} instance.
-	 *
-	 * @param server
-	 *            API server that the requests will be sent to.
-	 * @param filterProfanity
-	 *            whether to filter out NSFW {@link Question}s and {@link Guess}es.
-	 * @param language
-	 *            {@link Language} of {@link Question}s.
-	 * @param guessType
-	 *            {@link GuessType} of {@link Guess}es.
-	 */
-	public ImmutableAkiwrapperMetadata(@Nullable Server server, boolean filterProfanity, @Nonnull Language language,
-									   @Nonnull GuessType guessType) {
-		this.server = server;
-		this.filterProfanity = filterProfanity;
-		this.localization = language;
-		this.guessType = guessType;
-	}
-
-	@Override
-	public Server getServer() {
-		return this.server;
-	}
-
-	@Override
-	public boolean doesFilterProfanity() {
-		return this.filterProfanity;
-	}
-
-	@Override
-	public Language getLanguage() {
-		return this.localization;
-	}
-
-	@Override
-	public GuessType getGuessType() {
-		return this.guessType;
-	}
-
-}
diff --git a/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/QuestionImpl.java b/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/QuestionImpl.java
index 60cc203..f249ab9 100644
--- a/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/QuestionImpl.java
+++ b/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/QuestionImpl.java
@@ -9,11 +9,6 @@
 import com.markozajc.akiwrapper.core.exceptions.MissingQuestionException;
 import com.markozajc.akiwrapper.core.utils.JSONUtils;
 
-/**
- * An implementation of {@link Question}.
- *
- * @author Marko Zajc
- */
 public class QuestionImpl implements Question {
 
 	@Nonnull
@@ -27,19 +22,6 @@ public class QuestionImpl implements Question {
 	@Nonnegative
 	private final double progression;
 
-	/**
-	 * Constructs a new {@link QuestionImpl} instance from raw parameters.
-	 *
-	 * @param id
-	 * @param question
-	 * @param step
-	 * @param gain
-	 * @param progression
-	 * @param status
-	 *
-	 * @throws MissingQuestionException
-	 *             if there are no more questions left.
-	 */
 	public QuestionImpl(@Nonnull String id, @Nonnull String question, @Nonnegative int step, @Nonnegative double gain,
 						@Nonnegative double progression, @Nonnull Status status) {
 		checkMissingQuestion(status);
@@ -51,15 +33,6 @@ public QuestionImpl(@Nonnull String id, @Nonnull String question, @Nonnegative i
 		this.progression = progression;
 	}
 
-	/**
-	 * Constructs a new {@link QuestionImpl} instance from a {@link JSONObject}.
-	 *
-	 * @param json
-	 * @param status
-	 *
-	 * @throws MissingQuestionException
-	 *             if there are no more questions left.
-	 */
 	@SuppressWarnings("null")
 	public QuestionImpl(@Nonnull JSONObject json, @Nonnull Status status) {
 		checkMissingQuestion(status);
diff --git a/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/ServerImpl.java b/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/ServerImpl.java
index 35a449b..874cabc 100644
--- a/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/ServerImpl.java
+++ b/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/ServerImpl.java
@@ -8,11 +8,6 @@
 import com.jcabi.xml.XML;
 import com.markozajc.akiwrapper.core.entities.Server;
 
-/**
- * An implementation of {@link Server}.
- *
- * @author Marko Zajc
- */
 public class ServerImpl implements Server {
 
 	private static final String LANGUAGE_ID_XPATH = "LANGUAGE/LANG_ID/text()"; // NOSONAR not a URL
@@ -25,31 +20,12 @@ public class ServerImpl implements Server {
 	@Nonnull
 	private final GuessType guessType;
 
-	/**
-	 * Constructs a new instance of {@link ServerImpl}.
-	 *
-	 * @param url
-	 *            server's URL (for example {@code https://srv3.akinator.com:9331/ws}).
-	 * @param localization
-	 *            server's language.
-	 * @param guessType
-	 *            server's guess type.
-	 */
 	public ServerImpl(@Nonnull String url, @Nonnull Language localization, @Nonnull GuessType guessType) {
 		this.url = url;
 		this.localization = localization;
 		this.guessType = guessType;
 	}
 
-	/**
-	 * Constructs a {@link ServerImpl} from an {@code <INSTANCE>} XML node provided by
-	 * the server-listing API endpoint.
-	 *
-	 * @param instance
-	 *            XML node.
-	 *
-	 * @return a {@link ServerImpl}.
-	 */
 	@SuppressWarnings("null")
 	@Nonnull
 	public static List<ServerImpl> fromXml(@Nonnull XML instance) {
diff --git a/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/StatusImpl.java b/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/StatusImpl.java
index 731def1..6a63292 100644
--- a/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/StatusImpl.java
+++ b/src/main/java/com/markozajc/akiwrapper/core/entities/impl/immutable/StatusImpl.java
@@ -4,14 +4,8 @@
 
 import org.json.JSONObject;
 
-import com.google.gson.JsonObject;
 import com.markozajc.akiwrapper.core.entities.Status;
 
-/**
- * An implementation of {@link Status}.
- *
- * @author Marko Zajc
- */
 public class StatusImpl implements Status {
 
 	private static final long serialVersionUID = 1;
@@ -24,21 +18,11 @@ public class StatusImpl implements Status {
 	@Nonnull
 	private final Level level;
 
-	/**
-	 * Constructs a new {@link StatusImpl} instance from raw parameters.
-	 *
-	 * @param completion
-	 */
 	public StatusImpl(@Nonnull String completion) {
 		this.level = determineLevel(completion);
 		this.reason = determineReason(completion);
 	}
 
-	/**
-	 * Constructs a new {@link StatusImpl} instance from a {@link JsonObject}.
-	 *
-	 * @param json
-	 */
 	@SuppressWarnings("null")
 	public StatusImpl(@Nonnull JSONObject json) {
 		this(json.getString("completion"));
diff --git a/src/main/java/com/markozajc/akiwrapper/core/entities/impl/mutable/MutableAkiwrapperMetadata.java b/src/main/java/com/markozajc/akiwrapper/core/entities/impl/mutable/MutableAkiwrapperMetadata.java
index e286616..27d5b06 100644
--- a/src/main/java/com/markozajc/akiwrapper/core/entities/impl/mutable/MutableAkiwrapperMetadata.java
+++ b/src/main/java/com/markozajc/akiwrapper/core/entities/impl/mutable/MutableAkiwrapperMetadata.java
@@ -4,14 +4,7 @@
 
 import com.markozajc.akiwrapper.core.entities.*;
 import com.markozajc.akiwrapper.core.entities.Server.*;
-import com.markozajc.akiwrapper.core.entities.impl.immutable.ImmutableAkiwrapperMetadata;
-import com.markozajc.akiwrapper.core.utils.Servers;
 
-/**
- * A mutable implementation of {@link AkiwrapperMetadata}.
- *
- * @author Marko Zajc
- */
 public abstract class MutableAkiwrapperMetadata extends AkiwrapperMetadata {
 
 	@Nullable
@@ -22,20 +15,8 @@ public abstract class MutableAkiwrapperMetadata extends AkiwrapperMetadata {
 	@Nonnull
 	protected GuessType guessType;
 
-	/**
-	 * Creates a new {@link ImmutableAkiwrapperMetadata} instance.
-	 *
-	 * @param server
-	 *            API server that the requests will be sent to.
-	 * @param filterProfanity
-	 *            whether to filter out NSFW {@link Question}s and {@link Guess}es.
-	 * @param language
-	 *            {@link Language} of {@link Question}s.
-	 * @param guessType
-	 *            {@link GuessType} of {@link Guess}es.
-	 */
-	public MutableAkiwrapperMetadata(@Nullable Server server, boolean filterProfanity, @Nonnull Language language,
-									 @Nonnull GuessType guessType) {
+	protected MutableAkiwrapperMetadata(@Nullable Server server, boolean filterProfanity, @Nonnull Language language,
+										@Nonnull GuessType guessType) {
 		this.server = server;
 		this.filterProfanity = filterProfanity;
 		this.language = language;
@@ -47,21 +28,6 @@ public Server getServer() {
 		return this.server;
 	}
 
-	/**
-	 * Sets the {@link Server} or (recommended) a {@link ServerList}. It is not
-	 * recommended to set the {@link Server} manually (unless for debugging purposes or
-	 * as some kind of workaround where Akiwrapper's server finder fails) as Akiwrapper
-	 * already does its best to find the most suitable one. <br>
-	 * <b>Caution!</b> Setting the server to a non-null value overwrites the
-	 * {@link Language} and the {@link GuessType} with the given {@link Server}'s values.
-	 *
-	 * @param server
-	 *
-	 * @return current instance, used for chaining
-	 *
-	 * @see #getServer()
-	 * @see Servers#findServers(Language, GuessType)
-	 */
 	@Nonnull
 	public MutableAkiwrapperMetadata setServer(@Nullable Server server) {
 		this.server = server;
@@ -69,7 +35,6 @@ public MutableAkiwrapperMetadata setServer(@Nullable Server server) {
 			this.language = server.getLanguage();
 			this.guessType = server.getGuessType();
 		}
-
 		return this;
 	}
 
@@ -78,19 +43,9 @@ public boolean doesFilterProfanity() {
 		return this.filterProfanity;
 	}
 
-	/**
-	 * Sets the "filter profanity" mode.
-	 *
-	 * @param filterProfanity
-	 *
-	 * @return current instance, used for chaining
-	 *
-	 * @see #doesFilterProfanity()
-	 */
 	@Nonnull
 	public MutableAkiwrapperMetadata setFilterProfanity(boolean filterProfanity) {
 		this.filterProfanity = filterProfanity;
-
 		return this;
 	}
 
@@ -99,22 +54,10 @@ public Language getLanguage() {
 		return this.language;
 	}
 
-	/**
-	 * Sets the {@link Language}.<br>
-	 * <b>Caution!</b> Setting the {@link Language} will set the {@link Server} to
-	 * {@code null} (meaning it will be automatically selected).
-	 *
-	 * @param language
-	 *
-	 * @return current instance, used for chaining
-	 *
-	 * @see #getLanguage()
-	 */
 	@Nonnull
 	public MutableAkiwrapperMetadata setLanguage(@Nonnull Language language) {
 		this.language = language;
 		this.server = null;
-
 		return this;
 	}
 
@@ -123,17 +66,6 @@ public GuessType getGuessType() {
 		return this.guessType;
 	}
 
-	/**
-	 * Sets the {@link GuessType}.<br>
-	 * <b>Caution!</b> Setting the {@link Language} will set the {@link Server} to
-	 * {@code null} (meaning it will be automatically selected).
-	 *
-	 * @param guessType
-	 *
-	 * @return current instance, used for chaining
-	 *
-	 * @see #getLanguage()
-	 */
 	@Nonnull
 	public MutableAkiwrapperMetadata setGuessType(@Nonnull GuessType guessType) {
 		this.guessType = guessType;
diff --git a/src/main/java/com/markozajc/akiwrapper/core/exceptions/MissingQuestionException.java b/src/main/java/com/markozajc/akiwrapper/core/exceptions/MissingQuestionException.java
index 1c5725a..a03c1db 100644
--- a/src/main/java/com/markozajc/akiwrapper/core/exceptions/MissingQuestionException.java
+++ b/src/main/java/com/markozajc/akiwrapper/core/exceptions/MissingQuestionException.java
@@ -10,7 +10,6 @@ public class MissingQuestionException extends RuntimeException {
 	/**
 	 * Constructs a new {@link MissingQuestionException} instance.
 	 */
-	public MissingQuestionException() {
-	}
+	public MissingQuestionException() {}
 
 }
diff --git a/src/main/java/com/markozajc/akiwrapper/core/exceptions/ServerNotFoundException.java b/src/main/java/com/markozajc/akiwrapper/core/exceptions/ServerNotFoundException.java
index e5dcc41..593be6d 100644
--- a/src/main/java/com/markozajc/akiwrapper/core/exceptions/ServerNotFoundException.java
+++ b/src/main/java/com/markozajc/akiwrapper/core/exceptions/ServerNotFoundException.java
@@ -14,7 +14,6 @@ public class ServerNotFoundException extends Exception {
 	/**
 	 * Constructs a new {@link ServerNotFoundException}.
 	 */
-	public ServerNotFoundException() {
-	}
+	public ServerNotFoundException() {}
 
 }
diff --git a/src/main/java/com/markozajc/akiwrapper/core/impl/AkiwrapperImpl.java b/src/main/java/com/markozajc/akiwrapper/core/impl/AkiwrapperImpl.java
index b84c3e0..96a810a 100644
--- a/src/main/java/com/markozajc/akiwrapper/core/impl/AkiwrapperImpl.java
+++ b/src/main/java/com/markozajc/akiwrapper/core/impl/AkiwrapperImpl.java
@@ -6,28 +6,18 @@
 
 import org.json.*;
 
-import com.markozajc.akiwrapper.*;
+import com.markozajc.akiwrapper.Akiwrapper;
 import com.markozajc.akiwrapper.core.Route;
 import com.markozajc.akiwrapper.core.entities.*;
 import com.markozajc.akiwrapper.core.entities.Status.Level;
 import com.markozajc.akiwrapper.core.entities.impl.immutable.*;
 import com.markozajc.akiwrapper.core.exceptions.*;
 
-/**
- * An implementation of {@link Akiwrapper}.
- *
- * @author Marko Zajc
- */
 public class AkiwrapperImpl implements Akiwrapper {
 
 	private static final String NO_MORE_QUESTIONS_STATUS = "elem list is empty";
 	private static final String PARAMETERS_KEY = "parameters";
 
-	/**
-	 * A class used to define the session token.
-	 *
-	 * @author Marko Zajc
-	 */
 	public static class Token {
 
 		private static final String AUTH_QUERYSTRING = "&session=%s&signature=%s";
@@ -35,12 +25,6 @@ public static class Token {
 		private final long signature;
 		private final int session;
 
-		/**
-		 * Creates a new {@link Token}.
-		 *
-		 * @param signature
-		 * @param session
-		 */
 		public Token(long signature, int session) {
 			this.signature = signature;
 			this.session = session;
@@ -54,9 +38,6 @@ private int getSession() {
 			return this.session;
 		}
 
-		/**
-		 * @return the compiled token
-		 */
 		public String compile() {
 			return String.format(AUTH_QUERYSTRING, "" + this.getSession(), "" + this.getSignature());
 		}
@@ -73,16 +54,6 @@ public String compile() {
 	@Nullable
 	private Question currentQuestion;
 
-	/**
-	 * Constructs a new {@link Akiwrapper} instance and creates a new API session. The
-	 * first question can be retrieved with {@link #getCurrentQuestion()}.
-	 *
-	 * @param server
-	 *            {@link Server} to use. Does not work with a {@link ServerList},
-	 *            {@link AkiwrapperBuilder} implements that functionality.
-	 * @param filterProfanity
-	 *            whether to tell API to filter profanity.
-	 */
 	@SuppressWarnings("null")
 	public AkiwrapperImpl(@Nonnull Server server, boolean filterProfanity) {
 		JSONObject question = Route.NEW_SESSION
diff --git a/src/test/java/com/markozajc/akiwrapper/IntegrationTest.java b/src/test/java/com/markozajc/akiwrapper/IntegrationTest.java
index 39d6c32..fb01edd 100644
--- a/src/test/java/com/markozajc/akiwrapper/IntegrationTest.java
+++ b/src/test/java/com/markozajc/akiwrapper/IntegrationTest.java
@@ -18,13 +18,16 @@
 
 class IntegrationTest {
 
-	private static final String SERVER_GUESSTYPE_NO_MATCH = "The wanted and actual guess type of the server don't match.";
+	private static final String SERVER_GUESSTYPE_NO_MATCH =
+		"The wanted and actual guess type of the server don't match.";
 	private static final String SERVER_LANGUAGE_NO_MATCH = "The wanted and actual language of the server don't match.";
-	private static final String QUESTION_CURRENT_NO_MATCH = "Current question does not match the one just returned by the API.";
+	private static final String QUESTION_CURRENT_NO_MATCH =
+		"Current question does not match the one just returned by the API.";
 	private static final String QUESTION_WRONG_STEP = "Question was on an unexpected step.";
 	private static final String QUESTION_EMPTY = "Question mustn't be empty.";
 	private static final String QUESTION_NULL = "Question was null";
-	private static final String QUESTION_INITIAL_NO_MATCH = "Initial question does not match the one after an equal amount of answers and undoes.";
+	private static final String QUESTION_INITIAL_NO_MATCH =
+		"Initial question does not match the one after an equal amount of answers and undoes.";
 
 	@ParameterizedTest
 	@MethodSource("generateTestAkiwrapper")
diff --git a/versions-ruleset.xml b/versions-ruleset.xml
new file mode 100644
index 0000000..193c626
--- /dev/null
+++ b/versions-ruleset.xml
@@ -0,0 +1,16 @@
+<ruleset
+	xmlns="http://mojo.codehaus.org/versions-maven-plugin/rule/2.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	comparisonMethod="maven"
+	xsi:schemaLocation="http://mojo.codehaus.org/versions-maven-plugin/rule/2.0.0 https://mojo.codehaus.org/versions-maven-plugin/xsd/rule-2.0.0.xsd">
+	<rules>
+		<rule groupId="*">
+			<ignoreVersions>
+				<ignoreVersion type="regex">.*-alpha\d$</ignoreVersion>
+				<ignoreVersion type="regex">.*-beta\d$</ignoreVersion>
+				<ignoreVersion type="regex">.*-M\d$</ignoreVersion>
+				<ignoreVersion type="regex">.*-RC\d$</ignoreVersion>
+			</ignoreVersions>
+		</rule>
+	</rules>
+</ruleset>