class org.jboss.resteasy.plugins.server.servlet.HttpServlet30Dispatcher does not implement jakarta.servlet.Servlet

Question

I'm updating dependencies in my project. Below are the corresponding undertow & resteasy dependecies I'm using.

<dependency>
   <groupId>io.undertow</groupId>
   <artifactId>undertow-core</artifactId>
   <version>2.3.12.Final</version>
</dependency>
<dependency>
   <groupId>io.undertow</groupId>
   <artifactId>undertow-servlet</artifactId>
   <version>2.3.12.Final</version>
</dependency>
<dependency>
   <groupId>io.undertow</groupId>
   <artifactId>undertow-websockets-jsr</artifactId>
   <version>2.3.12.Final</version>
</dependency>
<dependency>
   <groupId>org.jboss.resteasy</groupId>
   <artifactId>resteasy-undertow</artifactId>
   <version>3.15.6.Final</version>
</dependency>
<dependency>
   <groupId>org.jboss.resteasy</groupId>
   <artifactId>resteasy-jaxrs</artifactId>
   <version>3.15.6.Final</version>
</dependency>
<dependency>
   <groupId>org.jboss.resteasy</groupId>
   <artifactId>resteasy-client</artifactId>
   <version>3.15.6.Final</version>
</dependency>

Getting below exception when running the application

Exception in thread "main" java.lang.IllegalArgumentException: UT010009: Servlet ResteasyServlet_<class_name> of type class org.jboss.resteasy.plugins.server.servlet.HttpServlet30Dispatcher does not implement jakarta.servlet.Servlet at io.undertow.servlet.api.ServletInfo.(ServletInfo.java:76) at io.undertow.servlet.Servlets.servlet(Servlets.java:102) at com.alacriti.serverless.undertow.server.ServicesServer.doUndertowRespAppDeployment(ServicesServer.java:600) at com.alacriti.serverless.undertow.server.ServicesServer.createDeploymentInfoAndAddRestApps(ServicesServer.java:574) at com.alacriti.serverless.undertow.server.ServicesServer.start(ServicesServer.java:365) at com.alacriti.serverless.undertow.server.ServicesServer.main(ServicesServer.java:1044)

Can someone help me to resolve this issue. Thanks in advance.

Answer 1

You need to upgrade the version of RESTEasy you're using. The latest version is 6.2.8.Final. The 3.15.x version implements the Jakarta REST 2.1 specification which is part of Jakarta EE 8.