Integration Problem between Selenium-Maven_Plugin and GWT

Problem

When trying to run gwt in hosted mode, showed the following error message:

Exception in thread "main" java.lang.IncompatibleClassChangeError: Class org.mortbay.jetty.servlet.HashSessionManager does not implement the requested interface org.mortbay.jetty.SessionManager

at org.mortbay.jetty.servlet.SessionHandler.setSessionManager(SessionHandler.java:88) at org.mortbay.jetty.servlet.SessionHandler.(SessionHandler.java:62) at org.mortbay.jetty.servlet.SessionHandler.(SessionHandler.java:53) at org.mortbay.jetty.webapp.WebAppContext.(WebAppContext.java:297) at com.google.gwt.dev.ServletValidator.create(ServletValidator.java:67) at com.google.gwt.dev.ServletValidator.create(ServletValidator.java:51) at com.google.gwt.dev.HostedMode.doStartup(HostedMode.java:344) at com.google.gwt.dev.HostedModeBase.startUp(HostedModeBase.java:585) at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:397) at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)

Reason

The following excerpt from pom.xml:

...

<dependency>

<groupId>org.codehaus.mojo</groupId>

<artifactId>selenium-maven-plugin</artifactId>

<version>1.0-beta-3</version>

<scope>test</scope>

</dependency>

...

The above depency is causing problems to execution of hosted mode. One solution proposed by someone here to exclude the jetty does not work.

Solution

As I was just wanting the libraries of selenium to run the tests, I used the dependence of Testng as below:

...

<dependency>

<groupId>org.apache.geronimo.testsupport</groupId>

<artifactId>testsupport-selenium</artifactId>

<version>2.1.3</version>

</dependency>

...

In this solution it also brings testng.jar. I will verify latter how to exclude it.