if (fFirstCheck) { fFirstCheck= false; return; }
	private void validateInput() {		String errorMessage= null; //$NON-NLS-1$		String newText= fWorkingSetName.getText();		if (fFirstCheck) {			fFirstCheck= false;			return;		}		if (newText.equals("")) //$NON-NLS-1$			errorMessage= WorkingSetMessages.getString("JavaWorkingSetPage.warning.nameMustNotBeEmpty"); //$NON-NLS-1$		if (errorMessage == null && (fWorkingSet == null || newText.equals(fWorkingSet.getName()) == false)) {			IWorkingSet[] workingSets= PlatformUI.getWorkbench().getWorkingSetManager().getWorkingSets();			for (int i= 0; i < workingSets.length; i++) {				if (newText.equals(workingSets[i].getName())) {					errorMessage= WorkingSetMessages.getString("JavaWorkingSetPage.warning.workingSetExists"); //$NON-NLS-1$				}			}		}		if (errorMessage == null && fTree.getCheckedElements().length == 0)			errorMessage= WorkingSetMessages.getString("JavaWorkingSetPage.warning.resourceMustBeChecked"); //$NON-NLS-1$		setErrorMessage(errorMessage);		setPageComplete(errorMessage == null);	}