I want to completely switch off Eclipse validation for all languages.
This is not the same as disabling validation of various patterns, I don't want Eclipse to even try to validate.
Version is Juno.
Click Window > Preferences and select Validation in the left pane. The Validation page of the Preferences window lists the validators available in your project and their settings.
To disable individual validators, clear the check boxes next to each validator that you want to disable. Each validator has a check box to specify whether it is enabled for manual validation or on a build.