Fix nullability annotations on wildcard types

src/main/java/com/hivemq/client2/mqtt/mqtt3/message/subscribe/Mqtt3Subscribe.java

@@ -47,7 +47,7 @@ public interface Mqtt3Subscribe extends Mqtt3Message {
      * @return the {@link Mqtt3Subscription Subscriptions} of this Subscribe message. The list contains at least one
      *         Subscription.
      */
-    @Unmodifiable @NotNull List<@NotNull ? extends Mqtt3Subscription> getSubscriptions();
+    @Unmodifiable @NotNull List<? extends @NotNull Mqtt3Subscription> getSubscriptions();
 
     @Override
     default @NotNull Mqtt3MessageType getType() {

src/main/java/com/hivemq/client2/mqtt/mqtt3/message/subscribe/Mqtt3SubscribeBuilderBase.java

@@ -76,7 +76,7 @@ public interface Mqtt3SubscribeBuilderBase<C extends Mqtt3SubscribeBuilderBase.C
      * @since 1.2
      */
     @CheckReturnValue
-    @NotNull C addSubscriptions(@NotNull Collection<@NotNull ? extends Mqtt3Subscription> subscriptions);
+    @NotNull C addSubscriptions(@NotNull Collection<? extends @NotNull Mqtt3Subscription> subscriptions);
 
     /**
      * Adds a stream of {@link Mqtt3Subscription}s to the {@link Mqtt3Subscribe#getSubscriptions() list of
@@ -87,7 +87,7 @@ public interface Mqtt3SubscribeBuilderBase<C extends Mqtt3SubscribeBuilderBase.C
      * @since 1.2
      */
     @CheckReturnValue
-    @NotNull C addSubscriptions(@NotNull Stream<@NotNull ? extends Mqtt3Subscription> subscriptions);
+    @NotNull C addSubscriptions(@NotNull Stream<? extends @NotNull Mqtt3Subscription> subscriptions);
 
     /**
      * {@link Mqtt3SubscribeBuilderBase} that is complete which means all mandatory fields are set.

src/main/java/com/hivemq/client2/mqtt/mqtt3/message/unsubscribe/Mqtt3Unsubscribe.java

@@ -48,7 +48,7 @@ public interface Mqtt3Unsubscribe extends Mqtt3Message {
     /**
      * @return the Topic Filters of this Unsubscribe message. The list contains at least one Topic Filter.
      */
-    @Unmodifiable @NotNull List<@NotNull ? extends MqttTopicFilter> getTopicFilters();
+    @Unmodifiable @NotNull List<? extends @NotNull MqttTopicFilter> getTopicFilters();
 
     @Override
     default @NotNull Mqtt3MessageType getType() {

src/main/java/com/hivemq/client2/mqtt/mqtt5/datatypes/Mqtt5UserProperties.java

@@ -74,7 +74,7 @@ public interface Mqtt5UserProperties {
     /**
      * @return the User Properties as an immutable list.
      */
-    @Unmodifiable @NotNull List<@NotNull ? extends Mqtt5UserProperty> asList();
+    @Unmodifiable @NotNull List<? extends @NotNull Mqtt5UserProperty> asList();
 
     /**
      * @return a builder for extending this collection of User Properties.

src/main/java/com/hivemq/client2/mqtt/mqtt5/datatypes/Mqtt5UserPropertiesBuilderBase.java

@@ -81,7 +81,7 @@ public interface Mqtt5UserPropertiesBuilderBase<B extends Mqtt5UserPropertiesBui
      * @since 1.2
      */
     @CheckReturnValue
-    @NotNull B addAll(@NotNull Collection<@NotNull ? extends Mqtt5UserProperty> userProperties);
+    @NotNull B addAll(@NotNull Collection<? extends @NotNull Mqtt5UserProperty> userProperties);
 
     /**
      * Adds a stream of {@link Mqtt5UserProperty User Properties}.
@@ -91,5 +91,5 @@ public interface Mqtt5UserPropertiesBuilderBase<B extends Mqtt5UserPropertiesBui
      * @since 1.2
      */
     @CheckReturnValue
-    @NotNull B addAll(@NotNull Stream<@NotNull ? extends Mqtt5UserProperty> userProperties);
+    @NotNull B addAll(@NotNull Stream<? extends @NotNull Mqtt5UserProperty> userProperties);
 }

src/main/java/com/hivemq/client2/mqtt/mqtt5/message/subscribe/Mqtt5Subscribe.java

@@ -48,7 +48,7 @@ public interface Mqtt5Subscribe extends Mqtt5Message {
      * @return the {@link Mqtt5Subscription Subscriptions} of this Subscribe message. The list contains at least one
      *         Subscription.
      */
-    @Unmodifiable @NotNull List<@NotNull ? extends Mqtt5Subscription> getSubscriptions();
+    @Unmodifiable @NotNull List<? extends @NotNull Mqtt5Subscription> getSubscriptions();
 
     /**
      * @return the optional user properties of this Subscribe message.

src/main/java/com/hivemq/client2/mqtt/mqtt5/message/subscribe/Mqtt5SubscribeBuilderBase.java

@@ -78,18 +78,18 @@ public interface Mqtt5SubscribeBuilderBase<C extends Mqtt5SubscribeBuilderBase.C
      * @since 1.2
      */
     @CheckReturnValue
-    @NotNull C addSubscriptions(@NotNull Collection<@NotNull ? extends Mqtt5Subscription> subscriptions);
+    @NotNull C addSubscriptions(@NotNull Collection<? extends @NotNull Mqtt5Subscription> subscriptions);
 
     /**
-     * Adds a stream of {@link Mqtt5Subscription}s to the {@link Mqtt5Subscribe#getSubscriptions() list of
-     * subscriptions}. At least one subscription is mandatory.
+     * Adds a stream of {@link Mqtt5Subscription}s to the
+     * {@link Mqtt5Subscribe#getSubscriptions() list of subscriptions}. At least one subscription is mandatory.
      *
      * @param subscriptions the stream of subscriptions.
      * @return the builder that is now complete as at least one subscription is set.
      * @since 1.2
      */
     @CheckReturnValue
-    @NotNull C addSubscriptions(@NotNull Stream<@NotNull ? extends Mqtt5Subscription> subscriptions);
+    @NotNull C addSubscriptions(@NotNull Stream<? extends @NotNull Mqtt5Subscription> subscriptions);
 
     /**
      * {@link Mqtt5SubscribeBuilderBase} that is complete which means all mandatory fields are set.

src/main/java/com/hivemq/client2/mqtt/mqtt5/message/unsubscribe/Mqtt5Unsubscribe.java

@@ -48,7 +48,7 @@ public interface Mqtt5Unsubscribe extends Mqtt5Message {
     /**
      * @return the Topic Filters of this Unsubscribe message. The list contains at least one Topic Filter.
      */
-    @Unmodifiable @NotNull List<@NotNull ? extends MqttTopicFilter> getTopicFilters();
+    @Unmodifiable @NotNull List<? extends @NotNull MqttTopicFilter> getTopicFilters();
 
     /**
      * @return the optional user properties of this Unsubscribe message.

src/main/java/com/hivemq/client2/mqtt/mqtt5/message/unsubscribe/Mqtt5UnsubscribeBuilderBase.java

@@ -91,7 +91,7 @@ public interface Mqtt5UnsubscribeBuilderBase<C extends Mqtt5UnsubscribeBuilderBa
      * @since 1.2
      */
     @CheckReturnValue
-    @NotNull C addTopicFilters(@NotNull Collection<@NotNull ? extends MqttTopicFilter> topicFilters);
+    @NotNull C addTopicFilters(@NotNull Collection<? extends @NotNull MqttTopicFilter> topicFilters);
 
     /**
      * Adds a stream of {@link MqttTopicFilter Topic Filters} to the {@link Mqtt5Unsubscribe#getTopicFilters() list of
@@ -102,7 +102,7 @@ public interface Mqtt5UnsubscribeBuilderBase<C extends Mqtt5UnsubscribeBuilderBa
      * @since 1.2
      */
     @CheckReturnValue
-    @NotNull C addTopicFilters(@NotNull Stream<@NotNull ? extends MqttTopicFilter> topicFilters);
+    @NotNull C addTopicFilters(@NotNull Stream<? extends @NotNull MqttTopicFilter> topicFilters);
 
     /**
      * Reverses the subscriptions of a Subscribe message by adding their Topic Filters.