Overview most common errors Installation, start, network connectivity of RapidClipse RapidClipse does not start Internet or Firewall Settings. Use of special characters Settings and Notes for the Workspace. Performance problems within the IDE. No access to the supplied H2 test database. UI Builder UI Builder opens with an exception UI Builder opens with an HTTP error message UI Builder opens but stays empty with no error message Contents of the UI Builder are displayed shifted Activate Designer Console It always opens the class in the text editor instead of the UI builder Inserted-CSS-will-not-be-displayed-in-UI-Builder Project Development Java Runtime Configuration Sudden errors in the project with no apparent reason or changes in the code Error in project because internal classes were not created Error when starting the project with Tomcat