diff --git a/README.md b/README.md
index 78531402e..a332f0b45 100644
--- a/README.md
+++ b/README.md
@@ -1287,8 +1287,7 @@ They are checked in order, and the first one found is used:
 Jackson will force a sizable (> 1 MB) dependency to an Android application thus increasing the app download size for 
 mobile users.
 
-If you want to use POJOs and a JSON-B compliant specification _**or**_ you want to use JJWT on a JakartaEE compliant application server, use
-`io.jsonwebtoken:jjwt-jsonb`.
+If you want to use POJOs and a JSON-B compliant specification _**or**_ you want to use JJWT on a JakartaEE compliant application server, use `io.jsonwebtoken:jjwt-jsonb`.
 
 <a name="json-custom"></a>
 ### Custom JSON Processor
diff --git a/extensions/jsonb/src/main/java/io/jsonwebtoken/jsonb/io/JsonbDeserializer.java b/extensions/jsonb/src/main/java/io/jsonwebtoken/jsonb/io/JsonbDeserializer.java
index 53bfabb70..6d75b572c 100644
--- a/extensions/jsonb/src/main/java/io/jsonwebtoken/jsonb/io/JsonbDeserializer.java
+++ b/extensions/jsonb/src/main/java/io/jsonwebtoken/jsonb/io/JsonbDeserializer.java
@@ -25,7 +25,7 @@
 import static java.util.Objects.requireNonNull;
 
 /**
- * @since 0.10.0
+ * @since JJWT_RELEASE_VERSION
  */
 public class JsonbDeserializer<T> implements Deserializer<T> {
 
diff --git a/extensions/jsonb/src/main/java/io/jsonwebtoken/jsonb/io/JsonbSerializer.java b/extensions/jsonb/src/main/java/io/jsonwebtoken/jsonb/io/JsonbSerializer.java
index 25b949ada..0c4cd8d0e 100644
--- a/extensions/jsonb/src/main/java/io/jsonwebtoken/jsonb/io/JsonbSerializer.java
+++ b/extensions/jsonb/src/main/java/io/jsonwebtoken/jsonb/io/JsonbSerializer.java
@@ -28,7 +28,7 @@
 import static java.util.Objects.requireNonNull;
 
 /**
- * @since 0.10.0
+ * @since JJWT_RELEASE_VERSION
  */
 public class JsonbSerializer<T> implements Serializer<T> {
 
@@ -49,7 +49,7 @@ public JsonbSerializer(Jsonb jsonb) {
 
     @Override
     public byte[] serialize(T t) throws SerializationException {
-        Assert.notNull(t, "Object to serialize cannot be null.");
+        requireNonNull(t, "Object to serialize cannot be null.");
         try {
             return writeValueAsBytes(t);
         } catch (JsonbException jsonbException) {
diff --git a/extensions/pom.xml b/extensions/pom.xml
index 52cc61316..031139012 100644
--- a/extensions/pom.xml
+++ b/extensions/pom.xml
@@ -37,6 +37,17 @@
         <module>jackson</module>
         <module>orgjson</module>
         <module>gson</module>
-        <module>jsonb</module>
     </modules>
+
+    <profiles>
+        <profile>
+            <id>java8</id>
+            <activation>
+                <jdk>[8,)</jdk>
+            </activation>
+            <modules>
+                <module>jsonb</module>
+            </modules>
+        </profile>
+    </profiles>
 </project>