Eclipse Add Tomcat 7 blank server name "could not enter server name"

I was trying to add Tomcat 7 in my Eclipse in Ubuntu. When I click ' Add new server ' in Eclipse and select ' Tomcat v7.0 server ', the field ' Server Name ' is blank and I cannot ty PE in anything in that textbox as shown below:

What I do before is I deleted a tomcat 7 servers from Eclipse and I were trying to reinstall Tomcat 7. But it doesn ' t allow me to type anything in that TextBox and I cannot proceed to the "Next" button. My environment is Ubuntu Linux and Eclipse for Java EE.

Here are the workaround that worked for me:

1. Close Eclipse
2. Inch{workspace-directory}/.metadata/.plugins/org.eclipse.core.runtime/.settings
3. Delete the following files:
   • org.eclipse.wst.server.core.prefs
   • org.eclipse.jst.server.tomcat.core.prefs
4. Restart Eclipse
5. Original Blog link:http://www.xuebuyuan.com/1361033.html

Eclipse Add Tomcat 7 blank server name "could not enter server name"