Using Java how to disable the back button in a JFace wizard ?

explained:

Disabling the back button is harder than it should be, due to non-intuitive behavior in the default implementation of WizardPage.getPreviousPage(). You can call setPreviousPage( null ), and getPreviousPage() still returns the previous page. You need to override the implementation of getPreviousPage() in order to disable the back button

public abstract class MyWizardPage extends WizardPage {
    private boolean backButtonEnabled = true;
    public void setBackButtonEnabled(boolean enabled) {
        backButtonEnabled = enabled;
        getContainer().updateButtons();
    }
    @Override
    public IWizardPage getPreviousPage() {
        if (!backButtonEnabled) {
            return null;
        }
        return super.getPreviousPage();
    }
}