add JAXB to run the demo with Java 11 and higher
diff --git a/tobago-example/pom.xml b/tobago-example/pom.xml
index a507d68..0125f5a 100644
--- a/tobago-example/pom.xml
+++ b/tobago-example/pom.xml
@@ -471,6 +471,11 @@
           <artifactId>tobago-config-dev</artifactId>
           <version>${project.version}</version>
         </dependency>
+        <dependency> <!-- add JAXB to run the demo with Java 11 and higher -->
+          <groupId>javax.xml.bind</groupId>
+          <artifactId>jaxb-api</artifactId>
+          <version>2.3.1</version>
+        </dependency>
       </dependencies>
     </profile>