Bug 82231 [build path] Hard to find type restriction compiler problem preferences
I20050104-1600 There compiler preference page contains a Warning/Error node with many sub-entries . I tried to find where I could change the 'warning' for the access of internal types to 'error'. No luck until I realized that the Build node also contains Warning/Error settings.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/JavaBuildConfigurationBlock.java
/* (non-javadoc)
	 * Update fields and validate.
	 * @param changedKey Key that changed, or null, if all changed.
	 */	
	protected void validateSettings(Key changedKey, String oldValue, String newValue) {
		
		if (changedKey != null) {
			if (PREF_PB_MAX_PER_UNIT.equals(changedKey)) {
				fMaxNumberProblemsStatus= validateMaxNumberProblems();
			} else if (PREF_RESOURCE_FILTER.equals(changedKey)) {
				fResourceFilterStatus= validateResourceFilters();
			} else {
				return;
			}
		} else {
			updateEnableStates();
			fMaxNumberProblemsStatus= validateMaxNumberProblems();
			fResourceFilterStatus= validateResourceFilters();
		}		
		IStatus status= StatusUtil.getMostSevere(new IStatus[] { fMaxNumberProblemsStatus, fResourceFilterStatus });
		fContext.statusChanged(status);
	}
	
	private void updateEnableStates() {
	}
	
	protected String[] getFullBuildDialogStrings(boolean workspaceSettings) {
		String title= PreferencesMessages.JavaBuildConfigurationBlock_needsbuild_title;