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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