JEE: Caused by: java.lang.IllegalArgumentException: UT010009: Servlet Faces Servlet of type class javax.faces.webapp.FacesServlet does not implement jakarta.servlet.Servlet

 

>PROBLEM

The application fails when deployed on the server (Wildfly/jBoss) return the following message:

  Caused by: java.lang.IllegalArgumentException: UT010009: Servlet Faces Servlet of type class javax.faces.webapp.FacesServlet does not implement jakarta.servlet.Servlet

>SOLUTION

Check the following configuration:

- JDK'S version

- Libraries' versions (Maven's dependencies, etc.)

If the configuration seems correct, try to downgrade (or maybe upgrade) the server's version of JBoss or Wildfly.

For instance, from v.23 to v.21 or lower.

The application server's JEE version must be compatible with the project's libraries versions.

        Check WildFly's JEE versions on its download page.

>ENV

JDK 8/11

Wildfly 21

Eclipse

Windows 10