I am using Eclipse, Version: Indigo Service Release 1.
My GWT version is 2.4.0. I installed everything like GWT and Maven related plugins.
I am trying to import a existing gwt-maven project. When importing, I see this dialog:

Can anyone tell me why and how to solve it?
Google is your dear friend.
By entering "no marketplace entries found to handle gwt-mavn-plugin", I got:
Error when importing Maven-GWT project ("No marketplace entries found to handle gwt-maven-plugin")
gwt-maven-plugin with Eclipse Indigo
Eclipse: Import Maven project, missing maven-gae-plugin
EDIT :
Actually I would advise you to use
mavenfrom the command line instead of using theMaven pluginin Eclipse as I had exprienced many issues with it.From the command line, run the following commands:
mvn clean installmvn eclipse:eclipseAfterwards, from your eclipse, import your generated project as a normal project and voila!
Hope this helps!