diff --git a/gateway/service/src/main/java/org/eclipse/ditto/gateway/service/security/authentication/jwt/DefaultJwtValidator.java b/gateway/service/src/main/java/org/eclipse/ditto/gateway/service/security/authentication/jwt/DefaultJwtValidator.java
index eba174a53d..cb0fe5f629 100644
--- a/gateway/service/src/main/java/org/eclipse/ditto/gateway/service/security/authentication/jwt/DefaultJwtValidator.java
+++ b/gateway/service/src/main/java/org/eclipse/ditto/gateway/service/security/authentication/jwt/DefaultJwtValidator.java
@@ -19,7 +19,6 @@
 
 import org.eclipse.ditto.base.model.common.BinaryValidationResult;
 import org.eclipse.ditto.base.model.signals.commands.exceptions.GatewayAuthenticationFailedException;
-import org.eclipse.ditto.gateway.service.util.config.security.OAuthConfig;
 import org.eclipse.ditto.jwt.model.JsonWebToken;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -35,22 +34,19 @@ public final class DefaultJwtValidator implements JwtValidator {
     private static final Logger LOGGER = LoggerFactory.getLogger(DefaultJwtValidator.class);
 
     private final PublicKeyProvider publicKeyProvider;
-    private final OAuthConfig oAuthConfig;
 
-    private DefaultJwtValidator(final PublicKeyProvider publicKeyProvider, final OAuthConfig oAuthConfig) {
+    private DefaultJwtValidator(final PublicKeyProvider publicKeyProvider) {
         this.publicKeyProvider = publicKeyProvider;
-        this.oAuthConfig = oAuthConfig;
     }
 
     /**
      * Creates a new {@code JwtValidator} instance.
      *
      * @param publicKeyProvider provider for public keys of jwt issuers.
-     * @param oAuthConfig the OAuth config.
      * @return the instance.
      */
-    public static JwtValidator of(final PublicKeyProvider publicKeyProvider, final OAuthConfig oAuthConfig) {
-        return new DefaultJwtValidator(publicKeyProvider, oAuthConfig);
+    public static JwtValidator of(final PublicKeyProvider publicKeyProvider) {
+        return new DefaultJwtValidator(publicKeyProvider);
     }
 
     @Override
@@ -60,7 +56,8 @@ public CompletableFuture<BinaryValidationResult> validate(final JsonWebToken jso
 
         return publicKeyProvider.getPublicKeyWithParser(issuer, keyId)
                 .thenApply(publicKeyWithParserOpt -> publicKeyWithParserOpt
-                        .map(publicKeyWithParser -> tryToValidateWithJwtParser(jsonWebToken, publicKeyWithParser.getJwtParser()))
+                        .map(publicKeyWithParser -> tryToValidateWithJwtParser(jsonWebToken,
+                                publicKeyWithParser.getJwtParser()))
                         .orElseGet(() -> {
                             final var msgPattern = "Public Key of issuer <{0}> with key ID <{1}> not found!";
                             final var msg = MessageFormat.format(msgPattern, issuer, keyId);
@@ -70,7 +67,8 @@ public CompletableFuture<BinaryValidationResult> validate(final JsonWebToken jso
                         }));
     }
 
-    private BinaryValidationResult tryToValidateWithJwtParser(final JsonWebToken jsonWebToken, final JwtParser jwtParser) {
+    private BinaryValidationResult tryToValidateWithJwtParser(final JsonWebToken jsonWebToken,
+            final JwtParser jwtParser) {
         try {
             return validateWithJwtParser(jsonWebToken, jwtParser);
         } catch (final Exception e) {
diff --git a/gateway/service/src/main/java/org/eclipse/ditto/gateway/service/security/authentication/jwt/JwtAuthenticationFactory.java b/gateway/service/src/main/java/org/eclipse/ditto/gateway/service/security/authentication/jwt/JwtAuthenticationFactory.java
index 6f00452e61..ba85353996 100644
--- a/gateway/service/src/main/java/org/eclipse/ditto/gateway/service/security/authentication/jwt/JwtAuthenticationFactory.java
+++ b/gateway/service/src/main/java/org/eclipse/ditto/gateway/service/security/authentication/jwt/JwtAuthenticationFactory.java
@@ -68,7 +68,7 @@ public static JwtAuthenticationFactory newInstance(final OAuthConfig oAuthConfig
 
     public JwtValidator getJwtValidator() {
         if (null == jwtValidator) {
-            jwtValidator = DefaultJwtValidator.of(getPublicKeyProvider(), oAuthConfig);
+            jwtValidator = DefaultJwtValidator.of(getPublicKeyProvider());
         }
         return jwtValidator;
     }
diff --git a/gateway/service/src/main/java/org/eclipse/ditto/gateway/service/security/authentication/jwt/PublicKeyWithParser.java b/gateway/service/src/main/java/org/eclipse/ditto/gateway/service/security/authentication/jwt/PublicKeyWithParser.java
index 2fe060d009..4c98eec2fd 100644
--- a/gateway/service/src/main/java/org/eclipse/ditto/gateway/service/security/authentication/jwt/PublicKeyWithParser.java
+++ b/gateway/service/src/main/java/org/eclipse/ditto/gateway/service/security/authentication/jwt/PublicKeyWithParser.java
@@ -31,7 +31,6 @@ final class PublicKeyWithParser {
      *
      * @param publicKey publicKey to use for jwt parsing.
      * @param jwtParser the actual jwtParser using the given publicKey.
-     * @return the instance.
      */
     PublicKeyWithParser(final PublicKey publicKey, final JwtParser jwtParser) {
         this.publicKey = publicKey;
@@ -62,9 +61,9 @@ public int hashCode() {
 
     @Override
     public String toString() {
-        return "PublicKeyWithParser{" +
-            "publicKey=" + publicKey +
-            ", jwtParser=" + jwtParser +
-            '}';
+        return getClass().getSimpleName() + " [" +
+                "publicKey=" + publicKey +
+                ", jwtParser=" + jwtParser +
+                "]";
     }
 }
diff --git a/gateway/service/src/test/java/org/eclipse/ditto/gateway/service/security/authentication/jwt/JwtValidatorTest.java b/gateway/service/src/test/java/org/eclipse/ditto/gateway/service/security/authentication/jwt/JwtValidatorTest.java
index 5ab04e3284..ffce9d9226 100644
--- a/gateway/service/src/test/java/org/eclipse/ditto/gateway/service/security/authentication/jwt/JwtValidatorTest.java
+++ b/gateway/service/src/test/java/org/eclipse/ditto/gateway/service/security/authentication/jwt/JwtValidatorTest.java
@@ -87,7 +87,7 @@ public void validate() throws ExecutionException, InterruptedException {
         when(publicKeyProvider.getPublicKeyWithParser(JwtTestConstants.ISSUER, JwtTestConstants.KEY_ID)).thenReturn(
                 CompletableFuture.completedFuture(Optional.of(new PublicKeyWithParser(JwtTestConstants.PUBLIC_KEY, getJwtParser(JwtTestConstants.PUBLIC_KEY)))));
 
-        final JwtValidator underTest = DefaultJwtValidator.of(publicKeyProvider, oAuthConfig);
+        final JwtValidator underTest = DefaultJwtValidator.of(publicKeyProvider);
 
         final BinaryValidationResult jwtValidationResult = underTest.validate(VALID_JSON_WEB_TOKEN).get();
 
@@ -107,7 +107,7 @@ public void validateTokenWithNbfAheadOfTime() throws ExecutionException, Interru
         when(publicKeyProvider.getPublicKeyWithParser(JwtTestConstants.ISSUER, JwtTestConstants.KEY_ID)).thenReturn(
                 CompletableFuture.completedFuture(Optional.of(new PublicKeyWithParser(JwtTestConstants.PUBLIC_KEY, getJwtParser(JwtTestConstants.PUBLIC_KEY)))));
 
-        final JwtValidator underTest = DefaultJwtValidator.of(publicKeyProvider, oAuthConfig);
+        final JwtValidator underTest = DefaultJwtValidator.of(publicKeyProvider);
 
         final BinaryValidationResult jwtValidationResult =
                 underTest.validate(VALID_JSON_WEB_TOKEN_WITH_NBF_AHEAD_OF_TIME).get();
@@ -120,7 +120,7 @@ public void validateFailsIfNbfIsTooFarInTheFuture() throws ExecutionException, I
         when(publicKeyProvider.getPublicKeyWithParser(JwtTestConstants.ISSUER, JwtTestConstants.KEY_ID)).thenReturn(
                 CompletableFuture.completedFuture(Optional.of(new PublicKeyWithParser(JwtTestConstants.PUBLIC_KEY, getJwtParser(JwtTestConstants.PUBLIC_KEY)))));
 
-        final JwtValidator underTest = DefaultJwtValidator.of(publicKeyProvider, oAuthConfig);
+        final JwtValidator underTest = DefaultJwtValidator.of(publicKeyProvider);
 
         final BinaryValidationResult jwtValidationResult =
                 underTest.validate(INVALID_JSON_WEB_TOKEN_WITH_NBF_AHEAD_OF_TIME).get();
@@ -133,7 +133,7 @@ public void validateFailsIfSignatureIsMissing() throws ExecutionException, Inter
         when(publicKeyProvider.getPublicKeyWithParser(JwtTestConstants.ISSUER, JwtTestConstants.KEY_ID)).thenReturn(
                 CompletableFuture.completedFuture(Optional.of(new PublicKeyWithParser(JwtTestConstants.PUBLIC_KEY, getJwtParser(JwtTestConstants.PUBLIC_KEY)))));
 
-        final JwtValidator underTest = DefaultJwtValidator.of(publicKeyProvider, oAuthConfig);
+        final JwtValidator underTest = DefaultJwtValidator.of(publicKeyProvider);
 
         final BinaryValidationResult jwtValidationResult =
                 underTest.validate(VALID_JSON_WEB_TOKEN_WITHOUT_SIGNATURE).get();
@@ -148,7 +148,7 @@ public void validateFails() throws ExecutionException, InterruptedException {
                 .thenReturn(CompletableFuture.completedFuture(Optional.of(new PublicKeyWithParser(JwtTestConstants.PUBLIC_KEY,
                     getJwtParser(JwtTestConstants.PUBLIC_KEY)))));
 
-        final JwtValidator underTest = DefaultJwtValidator.of(publicKeyProvider, oAuthConfig);
+        final JwtValidator underTest = DefaultJwtValidator.of(publicKeyProvider);
 
         final BinaryValidationResult jwtValidationResult = underTest.validate(INVALID_JSON_WEB_TOKEN).get();