Hi Josué,

I recommend you learn more about dependecy management with maven as
the problem your facing is easily solvable once you've understood how
it works.

Anyway, the solution to your problem is excluding the conflicting
jetty dependency in your pom. Replace your selenium import with the
following:

<dependency>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>selenium-maven-plugin</artifactId>
    <version>1.0-beta-3</version>
    <scope>test</scope>
    <exclusions>
        <exclusion>
            <groupId>jetty</groupId>
            <artifactId>org.mortbay.jetty</artifactId>
        </exclusion>
    </exclusions>
</dependency>

Hope that helps,

Salvador

On May 12, 4:58 pm, Josué <[email protected]> wrote:
> Hi,
>
> I have the same problem here but the suggestion did not worked to me.
> Here is my scenario:
>
> I have a pom.xml (maven) in which most (but not all) project´s
> dependencies are  placed. When i put the following, the problem
> appears:
> ...
> <dependency>
>     <groupId>org.codehaus.mojo</groupId>
>     <artifactId>selenium-maven-plugin</artifactId>
>     <version>1.0-beta-3</version>
>     <scope>test</scope>
> </dependency>
> ...
> In the moment the only jar that is not in the pom.xml is gwt-user.jar.
> There is no available maven repository (at least the ones showed in
> the search inside eclipse). I did as suggested here and my Order and
> Export is in this way:
>
> gwt-user.jar
> projectName/src
> projectName/test
> JRE System Library [jre6]
> JUnit 4
> Maven Dependencies
>
> And all other jars is inside Maven Dependencies. Any suggestions would
> be very appreciated.
>
> Abraços,
>
> Josué.
>
> On 13 abr, 22:02, grishag <[email protected]> wrote:
>
> > Thanks for that. You were right on the money. I had a Selenium jar on
> > the classpath that was causing this problem.
>
> > On Apr 10, 11:48 am, jvictor <[email protected]> wrote:
>
> > > If using Eclipse, try moving the GWT jars (or the GWT SDK library if
> > > you are using the new Eclipse plugin) to the top of your classpath
> > > order.
>
> > > Right Click Project -> Properties -> Java Build Path -> Order and
> > > Export
>
> > > On Mar 27, 5:42 pm,grishag<[email protected]> wrote:
>
> > > > Hi,
>
> > > > I started using GWT 1.6.1 M2 recently and things were going quite
> > > > smoothly until I tried using hosted mode (with -noserver option). I am
> > > > now getting the following exception. Does anyone know what this
> > > > actually means? As far as I can tell, HashSessionManager does
> > > > implemented SessionManager interface (that is indirectly by extending
> > > > the AbstractSessionManager class).
>
> > > > Thanks.
>
> > > > [java] Exception in thread "main"
> > > > java.lang.IncompatibleClassChangeError: Class
> > > > org.mortbay.jetty.servlet.HashSessionManager does not implement the
> > > > requested interface org.mortbay.jetty.SessionManager
> > > >      [java]     at
> > > > org.mortbay.jetty.servlet.SessionHandler.setSessionManager
> > > > (SessionHandler.java:88)
> > > >      [java]     at org.mortbay.jetty.servlet.SessionHandler.<init>
> > > > (SessionHandler.java:62)
> > > >      [java]     at org.mortbay.jetty.servlet.SessionHandler.<init>
> > > > (SessionHandler.java:53)
> > > >      [java]     at org.mortbay.jetty.webapp.WebAppContext.<init>
> > > > (WebAppContext.java:297)
> > > >      [java]     at com.google.gwt.dev.ServletValidator.create
> > > > (ServletValidator.java:59)
> > > >      [java]     at com.google.gwt.dev.ServletValidator.create
> > > > (ServletValidator.java:43)
> > > >      [java]     at com.google.gwt.dev.HostedMode.doStartup
> > > > (HostedMode.java:344)
> > > >      [java]     at com.google.gwt.dev.HostedModeBase.startUp
> > > > (HostedModeBase.java:583)
> > > >      [java]     at com.google.gwt.dev.HostedModeBase.run
> > > > (HostedModeBase.java:395)
> > > >      [java]     at 
> > > > com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
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