Use Java 17

Author: mpkorstanje

java/pom.xml

@@ -43,6 +43,13 @@
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>
+            <dependency>
+                <groupId>org.assertj</groupId>
+                <artifactId>assertj-bom</artifactId>
+                <version>3.27.6</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
         </dependencies>
     </dependencyManagement>
 
@@ -85,6 +92,11 @@
             <artifactId>junit-jupiter</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>

java/src/main/java/io/cucumber/cucumberexpressions/Transformer.java

@@ -14,7 +14,7 @@ public interface Transformer<T> {
      * from the sole capture group or matches the whole expression. Nested
      * capture groups are ignored.
      * <p>
-     * If the capture group is optional <code>arg</code> may be null.
+     * If the capture group is optional {@code arg} may be {@code null}.
      *
      * @param arg the value of the single capture group
      * @return the transformed object