Samy,
We could not replicate the issue at our end on MyEclipse Blue 10.7.1.
Can you please follow these steps to add Jboss 7.1.1 server to MyEclispe Blue and let us know how this works for you :
1) Download Jboss 7.1.1 final server zip file from here – http://download.jboss.org/jbossas/7.1/jboss-as-7.1.1.Final/jboss-as-7.1.1.Final.zip
2) Extract the downloaded zip file to some folder
3) Open MyEclipse Blue and go to Window > Preferences > MyEclipse > Servers > Jboss > Jboss 7.x
4) Select Jboss home directory by clicking on browse, select the Jboss folder you have extracted in step 2
5) Select Enable and click Apply and then click Ok
6) Go to servers view, right click on JBoss 7.x and click Run server.
7) Open your browser and enter this link – http://localhost:8080 . You will see “Your JBoss Application Server 7 is running.” message in the browser
If you are still facing issues, Can you please clear the contents of .log file located at <Workspace>/.metadata/.log file, run the Jboss server, attach the .log file here to help us investigate further.
Please take a look at the attached screenshots for your reference.



